PG-2120- AN APPARENTLY NORMAL O-STAR AT HIGH GALACTIC LATITUDE(062 )

Authors
MOEHLER S HEBER U DREIZLER S
Citation
S. Moehler et al., PG-2120- AN APPARENTLY NORMAL O-STAR AT HIGH GALACTIC LATITUDE(062 ), Astronomy and astrophysics, 282(3), 1994, pp. 29-32
Citations number
31
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
282
Issue
3
Year of publication
1994
Pages
29 - 32
Database
ISI
SICI code
0004-6361(1994)282:3<29:PAANOA>2.0.ZU;2-O
Abstract
We report the spectroscopic identification of the faint blue star PG 2 120+062 (V = 14.4m) as an apparently normal O9 star. If massive, PG 21 20+062 would be at a distance of 50 kpc and 25 kpc below the galactic plane. T(eff) = 38000 K, log g = 4.25 results from a NLTE model atmosp here 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 spectroscopic ally. Variable H(alpha) emission is interpreted as due to a circumstel lar disk (Be star phenomenon) or a close companion star. In the latter case, the primary to secondary mass ratio would be very large (M(p)/M (s) > 7) and PG 2120+062 could be the progenitor of a symbiotic star o r a cataclysmic variable.