Non-Lte Analysis of Subluminous O-Stars - Part Two - the Hydrogen-Deficient Subdwarf O-Star HD127493

Details Non-Lte Analysis of Subluminous O-Stars - Part Two - the Hydrogen-Deficient Subdwarf O-Star HD127493 Non-Lte Analysis of Subluminous O-Stars - Part Two - the Hydrogen-Deficient Subdwarf O-Star HD127493

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..313s&link_type=abstract

Astronomy and Astrophysics, Vol.107, P. 313, 1982

Astronomy and Astrophysics

Astrophysics

12

Scientific paper

A detailed analysis of the sdO HD 127493 (= CD 22°1051 = BD -22°3804) is performed by means of non-LTE model atmospheres and non-LTE line formation computations. The fit of the equivalent widths of 14 lines and blends and ten profiles of H, He I and He II determines the parameter of the stellar atmosphere (effective temperature, surface gravity and helium abundance by numbers):
Teff=425001±2000K
log (g) =5.25±0.20 (cgs)
y=60±10%.
From the equivalent width of the interstellar Ca II K-line we derive a lower limit of the distance d > 2OOpc from which follow lower limits of luminosity, radius and mass
L>120Lsun
R>O.20Rsun
M>O.3Msun.
Suggestions are made for the evolutionary state of field subdwarf O-stars.

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