Cloudy circumstellar dust shells around young variable stars
Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussi...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Friedemann, C. [verfasserIn] |
|---|
| Format: |
Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
1994 |
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| Schlagwörter: |
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| Anmerkung: |
© Kluwer Academic Publishers 1994 |
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| Übergeordnetes Werk: |
Enthalten in: Astrophysics and space science - Kluwer Academic Publishers, 1968, 212(1994), 1-2 vom: Feb., Seite 221-229 |
|---|---|
| Übergeordnetes Werk: |
volume:212 ; year:1994 ; number:1-2 ; month:02 ; pages:221-229 |
| Links: |
|---|
| DOI / URN: |
10.1007/BF00984526 |
|---|
| Katalog-ID: |
OLC206619641X |
|---|
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| 520 | |a Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. | ||
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| 700 | 1 | |a Gürtler, J. |4 aut | |
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10.1007/BF00984526 doi (DE-627)OLC206619641X (DE-He213)BF00984526-p DE-627 ger DE-627 rakwb eng 520 530 620 VZ 16,12 ssgn Friedemann, C. verfasserin aut Cloudy circumstellar dust shells around young variable stars 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1994 Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. Dust Point Source Coagulation Process Dust Cloud Variable Star Reimann, H. -G. aut Gürtler, J. aut Enthalten in Astrophysics and space science Kluwer Academic Publishers, 1968 212(1994), 1-2 vom: Feb., Seite 221-229 (DE-627)129062723 (DE-600)629-4 (DE-576)014393522 0004-640X nnns volume:212 year:1994 number:1-2 month:02 pages:221-229 https://doi.org/10.1007/BF00984526 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-AST SSG-OPC-AST GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_2002 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4700 AR 212 1994 1-2 02 221-229 |
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10.1007/BF00984526 doi (DE-627)OLC206619641X (DE-He213)BF00984526-p DE-627 ger DE-627 rakwb eng 520 530 620 VZ 16,12 ssgn Friedemann, C. verfasserin aut Cloudy circumstellar dust shells around young variable stars 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1994 Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. Dust Point Source Coagulation Process Dust Cloud Variable Star Reimann, H. -G. aut Gürtler, J. aut Enthalten in Astrophysics and space science Kluwer Academic Publishers, 1968 212(1994), 1-2 vom: Feb., Seite 221-229 (DE-627)129062723 (DE-600)629-4 (DE-576)014393522 0004-640X nnns volume:212 year:1994 number:1-2 month:02 pages:221-229 https://doi.org/10.1007/BF00984526 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-AST SSG-OPC-AST GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_2002 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4700 AR 212 1994 1-2 02 221-229 |
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10.1007/BF00984526 doi (DE-627)OLC206619641X (DE-He213)BF00984526-p DE-627 ger DE-627 rakwb eng 520 530 620 VZ 16,12 ssgn Friedemann, C. verfasserin aut Cloudy circumstellar dust shells around young variable stars 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1994 Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. Dust Point Source Coagulation Process Dust Cloud Variable Star Reimann, H. -G. aut Gürtler, J. aut Enthalten in Astrophysics and space science Kluwer Academic Publishers, 1968 212(1994), 1-2 vom: Feb., Seite 221-229 (DE-627)129062723 (DE-600)629-4 (DE-576)014393522 0004-640X nnns volume:212 year:1994 number:1-2 month:02 pages:221-229 https://doi.org/10.1007/BF00984526 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-AST SSG-OPC-AST GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_2002 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4700 AR 212 1994 1-2 02 221-229 |
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10.1007/BF00984526 doi (DE-627)OLC206619641X (DE-He213)BF00984526-p DE-627 ger DE-627 rakwb eng 520 530 620 VZ 16,12 ssgn Friedemann, C. verfasserin aut Cloudy circumstellar dust shells around young variable stars 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1994 Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. Dust Point Source Coagulation Process Dust Cloud Variable Star Reimann, H. -G. aut Gürtler, J. aut Enthalten in Astrophysics and space science Kluwer Academic Publishers, 1968 212(1994), 1-2 vom: Feb., Seite 221-229 (DE-627)129062723 (DE-600)629-4 (DE-576)014393522 0004-640X nnns volume:212 year:1994 number:1-2 month:02 pages:221-229 https://doi.org/10.1007/BF00984526 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-AST SSG-OPC-AST GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_2002 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4700 AR 212 1994 1-2 02 221-229 |
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10.1007/BF00984526 doi (DE-627)OLC206619641X (DE-He213)BF00984526-p DE-627 ger DE-627 rakwb eng 520 530 620 VZ 16,12 ssgn Friedemann, C. verfasserin aut Cloudy circumstellar dust shells around young variable stars 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1994 Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. Dust Point Source Coagulation Process Dust Cloud Variable Star Reimann, H. -G. aut Gürtler, J. aut Enthalten in Astrophysics and space science Kluwer Academic Publishers, 1968 212(1994), 1-2 vom: Feb., Seite 221-229 (DE-627)129062723 (DE-600)629-4 (DE-576)014393522 0004-640X nnns volume:212 year:1994 number:1-2 month:02 pages:221-229 https://doi.org/10.1007/BF00984526 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-PHY SSG-OLC-AST SSG-OPC-AST GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_2002 GBV_ILN_2279 GBV_ILN_2286 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4700 AR 212 1994 1-2 02 221-229 |
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520 530 620 VZ 16,12 ssgn Cloudy circumstellar dust shells around young variable stars Dust Point Source Coagulation Process Dust Cloud Variable Star |
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Cloudy circumstellar dust shells around young variable stars |
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Cloudy circumstellar dust shells around young variable stars |
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Friedemann, C. |
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Astrophysics and space science |
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1994 |
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Friedemann, C. Reimann, H. -G. Gürtler, J. |
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cloudy circumstellar dust shells around young variable stars |
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Cloudy circumstellar dust shells around young variable stars |
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Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. © Kluwer Academic Publishers 1994 |
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Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. © Kluwer Academic Publishers 1994 |
| abstract_unstemmed |
Abstract A number of variable stars of the Orion population has been identified with IRAS point sources by us. This finding supports the conclusion that the prominent Algol-like minima in the lightcurves of these stars originate from obscurations by dust clouds in a circumstellar shell. The discussion of the existingUBVR data leads to the remarkable conclusion that the extinction properties of the grain populations contained in individual dust clouds moving in one and the same circumstellar shell are quite different. From the multicolour photometric data of the different Algol-like minima we derived individual values of the reddening parameterR = Av /E(B - V). It covers a remarkable wide range of values from that one typical of the interstellar extinction law up to 7. In the case of SV Cep one of the grain populations produces a virtually neutral extinction. The large values ofR speak in favour of larger than normal (interstellar) dust grains, which may have grown by coagulation processes. The cloudy circumstellar dust shell provides a natural explanation for the observed infrared excess. The properties derived from the optical light variations are fully compatible with the properties deduced from the infrared radiation. The irregularity of the light variations indicates that many clouds are involved and may sometimes superimpose themselves. © Kluwer Academic Publishers 1994 |
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