other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2012MNRAS.423.3031N - Mon. Not. R. Astron. Soc., 423, 3031-3038 (2012/July-2)
The helium-rich subdwarf CPD-20deg1123: a post-common-envelope binary evolving on to the extended horizontal branch.
NASLIM N., GEIER S., JEFFERY C.S., BEHARA N.T., WOOLF V.M. and CLASSEN L.
Abstract (from CDS):
We present a fine analysis of the bright intermediate helium sdB star CPD-20°1123 (Albus 1) which shows it to be cool, for a hot subdwarf, with Teff ≈ 23 000 K and with a surface helium abundance ≈ 17 per cent by number. Other elements do not show extraordinary anomalies; in common with majority sdB stars, carbon and oxygen are substantially depleted, whilst nitrogen is enriched. Magnesium through sulphur appear to be depleted by ≈ 0.5 dex, but chlorine and argon are substantially enhanced.
We also present a series of radial velocity measurements which show the star to be a close binary with an orbital period of 2.3 d, suggesting it to be a post-common-envelope system.
The discovery of an intermediate helium rich sdB star in a close binary in addition to known and apparently single exemplars supports the view that these are very young sdB stars in which radiatively driven stratification of the photosphere is incomplete. Abundance analysis of four members of the metal-rich open cluster NGC 6253
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): stars: abundances - binaries: general - stars: chemically peculiar - stars: evolution - stars: horizontal branch - subdwarf
Simbad objects: 6
To bookmark this query, right click on this link: simbad:2012MNRAS.423.3031N and select 'bookmark this link' or equivalent in the popup menu