Improved parameters of the hydrogen-deficient binary star KSPer

Details Improved parameters of the hydrogen-deficient binary star KSPer Improved parameters of the hydrogen-deficient binary star KSPer

2008-06-17

arxiv.org/abs/0806.2709v1

Astronomy and Astrophysics

Astrophysics

20 pages, 5 figures, 4 tables, submitted to Baltic Astronomy

Scientific paper

Using the high resolution spectral observations obtained with the Nasmyth Echelle Spectrograph NES of the 6m telescope we analysed the optical spectrum of the hydrogen-deficient binary star KSPer. The atmospheric parameters derived are: effective temperature Teff=9500+/-300 K, surface gravity log g=2.0+/-0.5, and microturbulent velocity Vt=9.5+/-0.5km/s. The hydrogen deficiency is H/He=3x10^{-5}, iron abundance is reduced by 0.8dex; nitrogen abundance is very high [N/Fe]=1.4, but carbon and oxygen abundances are low. The star luminosity is log L/Lo=3.3. A complex absorption and emission structure of the NaI D doublet was revealed. We suggest that the emission component forms in the circumbinary gaseous envelope.

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