Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-01-28
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 11 figures
Scientific paper
EC 11481-2303 is a peculiar, hot, high-gravity pre-white dwarf. Previous optical spectroscopy revealed that it is a sdOB star with an effective temperature (Teff) of 41790 K, a surface gravity log(g)= 5.84, and He/H = 0.014 by number. We present an on-going spectral analysis by means of non-LTE model-atmosphere techniques based on high-resolution, high-S/N optical (VLT-UVES) and ultraviolet (FUSE, IUE) observations. We are able to reproduce the optical and UV observations simultaneously with a chemically homogeneous NLTE model atmosphere with a significantly higher effective temperature and lower He abundance (Teff = 55000 K, log (g) = 5.8, and He / H = 0.0025 by number). While C, N, and O appear less than 0.15 times solar, the iron-group abundance is strongly enhanced by at least a factor of ten.
Kruk Jeff W.
Rauch Thomas
Werner Kirstin
No associations
LandOfFree
EC 11481-2303 - A Peculiar Subdwarf OB Star Revisited does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with EC 11481-2303 - A Peculiar Subdwarf OB Star Revisited, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and EC 11481-2303 - A Peculiar Subdwarf OB Star Revisited will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-254278