A FEROS Survey of Hot Subdwarf Stars
We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion. The samp...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/73943 |
| _version_ | 1848763138778857472 |
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| author | Vennes, S. Németh, P. Kawka, Adela |
| author_facet | Vennes, S. Németh, P. Kawka, Adela |
| author_sort | Vennes, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion. The sample was extracted from our GALEX catalogue of hot subdwarf stars. We identified three new short-period systems (P = 3.5 hours to 5 days) and determined the orbital parameters of a long-period (P = 62d.66) sdO plus G III system. This particular system should evolve into a close double degenerate system following a second common envelope phase.We also conducted a chemical abundance study of the subdwarfs: Some objects show nitrogen and argon abundance excess with respect to oxygen. We present key results of this programme. |
| first_indexed | 2025-11-14T10:58:42Z |
| format | Journal Article |
| id | curtin-20.500.11937-73943 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:58:42Z |
| publishDate | 2018 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-739432019-09-02T08:38:35Z A FEROS Survey of Hot Subdwarf Stars Vennes, S. Németh, P. Kawka, Adela We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion. The sample was extracted from our GALEX catalogue of hot subdwarf stars. We identified three new short-period systems (P = 3.5 hours to 5 days) and determined the orbital parameters of a long-period (P = 62d.66) sdO plus G III system. This particular system should evolve into a close double degenerate system following a second common envelope phase.We also conducted a chemical abundance study of the subdwarfs: Some objects show nitrogen and argon abundance excess with respect to oxygen. We present key results of this programme. 2018 Journal Article http://hdl.handle.net/20.500.11937/73943 10.1515/astro-2018-0005 restricted |
| spellingShingle | Vennes, S. Németh, P. Kawka, Adela A FEROS Survey of Hot Subdwarf Stars |
| title | A FEROS Survey of Hot Subdwarf Stars |
| title_full | A FEROS Survey of Hot Subdwarf Stars |
| title_fullStr | A FEROS Survey of Hot Subdwarf Stars |
| title_full_unstemmed | A FEROS Survey of Hot Subdwarf Stars |
| title_short | A FEROS Survey of Hot Subdwarf Stars |
| title_sort | feros survey of hot subdwarf stars |
| url | http://hdl.handle.net/20.500.11937/73943 |