Non-LTE, line-blanketed model atmospheres for late O- and early B-type stars

Abstract

view Abstract Citations (48) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Non--LTE, Line-blanketed Model Atmospheres for Late O- and Early B-Type Stars Grigsby, James A. ; Morrison, Nancy D. ; Anderson, Lawrence S. Abstract The use of non-LTE line-blanketed model atmospheres to analyze the spectra of hot stars is reported. The stars analyzed are members of clusters and associations, have spectral types in the range O9-B2 and luminosity classes in the range III-IV, have slow to moderate rotation, and are photometrically constant. Sampled line opacities of iron-group elements were incorporated in the radiative transfer solution; solar abundances were assumed. Good to excellent agreement is obtained between the computed profiles and essentially all the line profiles used to fix the model, and reliable stellar parameters are derived. The synthetic M II 5581 equivalent widths agree well with the observed ones at the low end of the temperature range studied, but, above 25,000 K, the synthetic line is generally stronger than the observed line. The behavior of the observed equivalent widths of N II, N III, C II and C III lines as a function of Teff is studied. Most of the lines show much scatter, with no consistent trend that could indicate abundance differences from star to star. Publication: The Astrophysical Journal Supplement Series Pub Date: January 1992 DOI: 10.1086/191625 Bibcode: 1992ApJS...78..205G Keywords: B Stars; Early Stars; Late Stars; Nonequilibrium Thermodynamics; O Stars; Stellar Atmospheres; Atmospheric Models; Hot Stars; Star Clusters; Stellar Spectra; Astrophysics; RADIATIVE TRANSFER; STARS: ABUNDANCES; STARS: ATMOSPHERES; STARS: EARLY-TYPE full text sources ADS | data products SIMBAD (34)