Academic Journal
Abundance analyses of helium-rich subluminous B stars
| العنوان: | Abundance analyses of helium-rich subluminous B stars |
|---|---|
| المؤلفون: | Naslim, N., Jeffery, Simon, Ahmad, Ajaz, Behara, Natalie Thérèse, Sahìn, Timur |
| المصدر: | Monthly notices of the Royal Astronomical Society, 409 (2 |
| سنة النشر: | 2010 |
| المجموعة: | DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
| مصطلحات موضوعية: | Astronomie, Astrophysique, Stars: abundances, Stars: chemically peculiar, Stars: early-type, Stars: evolution, Subdwarfs |
| الوصف: | The connection between helium-rich hot subdwarfs of spectral types O and B (He-sdB) has been relatively unexplored since the latter were found in significant numbers in the 1980s. In order to explore this connection further, we have analysed the surface composition of six He-sdB stars, including LB 1766, LB 3229, SB 21 (= Ton-S 137 = BPS 29503-0009), BPS 22940-0009, BPS 29496-0010 and BPS 22956-0094. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and elemental abundances. All the stars are moderately metal poor compared with the Sun ([ Fe/H ]˜-0.5). Four stars are nitrogen rich, two of these are carbon rich and at least four appear to be neon rich. The data are insufficient to rule out binarity in any of the sample. The surface composition and locus of the N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs, or possibly by the merger of a helium white dwarf with a post-sdB white dwarf. C-rich He-sdBs require further investigation. © 2010 The Authors. Journal compilation © 2010 RAS. ; SCOPUS: ar.j ; info:eu-repo/semantics/published |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | 1 full-text file(s): application/pdf |
| اللغة: | English |
| Relation: | uri/info:doi/10.1111/j.1365-2966.2010.17324.x; uri/info:scp/78449248978; https://dipot.ulb.ac.be/dspace/bitstream/2013/176704/3/doi_160334.pdf; http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/176704 |
| الاتاحة: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/176704 https://dipot.ulb.ac.be/dspace/bitstream/2013/176704/3/doi_160334.pdf |
| رقم الانضمام: | edsbas.C59C88CF |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |