Carbon abundances of sdO stars from SPY

Details Carbon abundances of sdO stars from SPY Carbon abundances of sdO stars from SPY

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.172a2015h&link_type=abstract

Journal of Physics: Conference Series, Volume 172, Issue 1, pp. 012015 (2009).

Physics

4

Scientific paper

Ströer et al. (2007) recently suggested a classification of sdOs according to supersolar and subsolar helium abundances, with only the helium-enriched stars showing signes of carbon and/or nitrogen in their optical spectra. We aim to derive reliable carbon and nitrogen abundances by fitting synthetic spectra to data obtained with the UVES spectrograph at ESO. Here we present our first results of the analysis of carbon abundances in hot subdwarf O stars. By constructing a grid of model atmospheres consisting of hydrogen, helium and carbon we were able to derive atmospheric parameters of nine carbon rich sdOs. We find log(NC/Ntotal) up to ten times higher than the solar value, while the mean value for the effective temperature and the surface gravity is slightly lower than derived by helium-hydrogen models only. Surprisingly, we also find three fast rotators among our program stars.

Affiliated with

Also associated with

No associations

Rating

Carbon abundances of sdO stars from SPY 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 Carbon abundances of sdO stars from SPY, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbon abundances of sdO stars from SPY will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1631101