The VLT-FLAMES Tarantula Survey: XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula
A spectroscopic analysis has been undertaken for the B-type multiple systems (excluding those with supergiant primaries) in the VLT-FLAMES Tarantula Survey (VFTS). Projected rotational velocities, ve sin i, for the primaries have been estimated using a Fourier Transform technique and confirmed by fi...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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EDP Sciences
2017
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| _version_ | 1826301826603941888 |
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| author | Garland, R Dufton, P Evans, C Crowther, P Howarth, I de Koter, A , d Grin, N Langer, N Lennon, D McEvoy, C Sana, H Schneider, F Símon Díaz, S Taylor, W Thompson, A Vink, J |
| author_facet | Garland, R Dufton, P Evans, C Crowther, P Howarth, I de Koter, A , d Grin, N Langer, N Lennon, D McEvoy, C Sana, H Schneider, F Símon Díaz, S Taylor, W Thompson, A Vink, J |
| author_sort | Garland, R |
| collection | OXFORD |
| description | A spectroscopic analysis has been undertaken for the B-type multiple systems (excluding those with supergiant primaries) in the VLT-FLAMES Tarantula Survey (VFTS). Projected rotational velocities, ve sin i, for the primaries have been estimated using a Fourier Transform technique and confirmed by fitting rotationally broadened profiles. A subset of 33 systems with ve sin i80 km s1 have been analysed using a TLUSTY grid of model atmospheres to estimate stellar parameters and surface abundances for the primaries. The effects of a potential flux contribution from an unseen secondary have also been considered. For 20 targets it was possible to reliably estimate their effective temperatures (Te) but for the other 13 objects it was only possible to provide a constraint of 20 000 Teff 26 000 K the other parameters estimated for these targets will be consequently less reliable. The estimated stellar properties are compared with evolutionary models and are generally consistent with their membership of 30 Doradus, while the nature of the secondaries of 3 SB2 system is discussed. A comparison with a sample of single stars with ve sin i80 km s1 obtained from the VFTS and analysed with the same techniques implies that the atmospheric parameters and nitrogen abundances of the two samples are similar. However, the binary sample may have a lack of primaries with significant nitrogen enhancements, which would be consistent with them having low rotational velocities and having effectively evolved as single stars without significant rotational mixing. This result, which may be actually a consequence of the limitations of the pathfinder investigation presented in this paper, should be considered as a motivation for spectroscopic abundance analysis of large samples of binary stars, with high quality observational data. |
| first_indexed | 2024-03-07T05:38:15Z |
| format | Journal article |
| id | oxford-uuid:e4a9ff88-65ad-4836-9193-40afbbeb7924 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:38:15Z |
| publishDate | 2017 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:e4a9ff88-65ad-4836-9193-40afbbeb79242022-03-27T10:18:16ZThe VLT-FLAMES Tarantula Survey: XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebulaJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e4a9ff88-65ad-4836-9193-40afbbeb7924EnglishSymplectic Elements at OxfordEDP Sciences2017Garland, RDufton, PEvans, CCrowther, PHowarth, Ide Koter, A, dGrin, NLanger, NLennon, DMcEvoy, CSana, HSchneider, FSímon Díaz, STaylor, WThompson, AVink, JA spectroscopic analysis has been undertaken for the B-type multiple systems (excluding those with supergiant primaries) in the VLT-FLAMES Tarantula Survey (VFTS). Projected rotational velocities, ve sin i, for the primaries have been estimated using a Fourier Transform technique and confirmed by fitting rotationally broadened profiles. A subset of 33 systems with ve sin i80 km s1 have been analysed using a TLUSTY grid of model atmospheres to estimate stellar parameters and surface abundances for the primaries. The effects of a potential flux contribution from an unseen secondary have also been considered. For 20 targets it was possible to reliably estimate their effective temperatures (Te) but for the other 13 objects it was only possible to provide a constraint of 20 000 Teff 26 000 K the other parameters estimated for these targets will be consequently less reliable. The estimated stellar properties are compared with evolutionary models and are generally consistent with their membership of 30 Doradus, while the nature of the secondaries of 3 SB2 system is discussed. A comparison with a sample of single stars with ve sin i80 km s1 obtained from the VFTS and analysed with the same techniques implies that the atmospheric parameters and nitrogen abundances of the two samples are similar. However, the binary sample may have a lack of primaries with significant nitrogen enhancements, which would be consistent with them having low rotational velocities and having effectively evolved as single stars without significant rotational mixing. This result, which may be actually a consequence of the limitations of the pathfinder investigation presented in this paper, should be considered as a motivation for spectroscopic abundance analysis of large samples of binary stars, with high quality observational data. |
| spellingShingle | Garland, R Dufton, P Evans, C Crowther, P Howarth, I de Koter, A , d Grin, N Langer, N Lennon, D McEvoy, C Sana, H Schneider, F Símon Díaz, S Taylor, W Thompson, A Vink, J The VLT-FLAMES Tarantula Survey: XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula |
| title | The VLT-FLAMES Tarantula Survey:
XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula |
| title_full | The VLT-FLAMES Tarantula Survey:
XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula |
| title_fullStr | The VLT-FLAMES Tarantula Survey:
XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula |
| title_full_unstemmed | The VLT-FLAMES Tarantula Survey:
XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula |
| title_short | The VLT-FLAMES Tarantula Survey:
XXVII. Physical parameters of B-type main-sequence binary systems in the Tarantula nebula |
| title_sort | vlt flames tarantula survey xxvii physical parameters of b type main sequence binary systems in the tarantula nebula |
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