Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329..101m&link_type=abstract
Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 101-105
Astronomy and Astrophysics
Astrophysics
5
Stars: Binaries: Close, Binaries: Eclipsing, Stars: Atmospheres, Stars: Individual: Aa Dor
Scientific paper
AA Dor is one of only seven known eclipsing binaries consisting of a hot subdwarf star and a low-mass companion. Although AA Dor has been studied in many investigations, a controversy about the nature of its companion persists. Is it a brown dwarf or a low-mass main sequence star? We reanalyse high resolution spectra using metal enhanced LTE model atmospheres. The optical spectra are polluted by reflected light from the companion. Using spectra taken during secondary eclipse, we derive atmospheric parameters consistent with results from the light curve. For the first time we achieve a self-consistent solution that matches all available observations, i.e. the light and radial velocity curves, as well as the atmospheric parameters. The resulting masses M1=0.510^{+0.125}_{-0.108} M_{odot} and M2=0.085^{+0.031}_{-0.023} M_{odot} are consistent with the canonical mass of an sdB star and a low-mass main sequence star. However, a brown dwarf companion cannot be excluded.
Geier Stephan
Heber Uli
Müller Samuel
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