Subluminous O Stars - Origin and Evolutionary Links
| dc.creator | Heber, Uli | |
| dc.date | 2008-04-09 | |
| dc.date.accessioned | 2026-07-07T09:31:20Z | |
| dc.date.available | 2026-07-07T09:31:20Z | |
| dc.description | Hot subluminous stars can be roughly divided into B- and O-types. Unlike the latter many sdBs are found in close binaries, indicating that binary evolution plays a vital role. Recent NLTE spectral analyses revealed that an evolutionary link between sdB stars and sdO stars is plausible only for the helium-deficient sdO stars, i.e. they are the likely successors to sdB stars. The atmospheric properties of helium-enriched sdO stars can be explained by the late hot flasher as well as by the white-dwarf merger scenarios, although both models do not match the observed properties of helium-enriched sdO stars in detail. The white dwarf merger scenario is favoured because it naturally explains the scarcity of close binaries amongst helium-enriched sdO stars. A hyper-velocity sdO star moving so fast that it is unbound to the Galaxy has probably been ejected by the super-massive black hole in the Galactic centre. | |
| dc.description | to appear in "Hydrogen deficient stars", K. Werner & T. Rauch (eds.), ASP Conference Series, Vol. 391, p.245 (2008) | |
| dc.identifier | https://arxiv.org/abs/0804.1527 | |
| dc.identifier | http://arxiv.org/abs/0804.1527 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/158425 | |
| dc.subject | Astrophysics | |
| dc.title | Subluminous O Stars - Origin and Evolutionary Links | |
| dc.type | text |