Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282l..29m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. L29-L32
Astronomy and Astrophysics
Astronomy
8
Atmospheric Models, Blue Stars, Emission Spectra, H Alpha Line, O Stars, Stellar Atmospheres, Stellar Models, Stellar Spectra, Astronomical Spectroscopy, Galactic Halos, Mathematical Models, Stellar Envelopes, Thermodynamic Equilibrium, Ultraviolet Astronomy, Visible Spectrum
Scientific paper
We report the spectroscopic identification of the faint blue star PG 2120+062 (V = 14.4 m) as an apparently normal O9 star. If massive, PG 2120+062 would be at a distance of 50 kpc and 25 kpc below the galactic plane. Teff = 38000 K, log g = 4.25 results from a nonlocal thermodynamic equilibrium (NLTE) model atmosphere analysis. PG 2120+062 could, however, also be a low mass post-AGB star at a distance of 5 kpc that mimics a normal O star spectroscopically. Variable H-alpha emission is interpreted as due to a circumstellar disk (Be star phenomenon) or a close companion star. In the latter case, the primary to secondary mass ratio would be very large Mp/Ms greater than 7) and PG 2120+062 could be the progenitor of a symbiotic star or a cataclysmic variable.
Dreizler Stefan
Heber Uli
Moehler Sabine
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