Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..419k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 419-424.
Astronomy and Astrophysics
Astrophysics
47
B Stars, Early Stars, Line Spectra, Nonequilibrium Thermodynamics, Stellar Composition, Astronomical Photometry, Gravitational Fields, Stellar Temperature
Scientific paper
Effective temperatures Teff and gravities log g of l9 unevolved B stars in the local field and nearby associations are given. Determinations of Teff due to non-LTE analyses of silicon line formation and non-LTE analyses of helium line formation are compared, and a reasonable agreement is obtained. Small differences were observed for four B stars only. The temperature calibration of some important photometric observables is discussed, with particular emphasis on a comparison with synthetic spectral indices. Temperatures obtained from the nonthermodynamic ionization equilibria of helium and silicon were found to be systematically higher by 2000 K than those calculated from synthetic photometry and LTE assumptions.
Becker Stephen R.
Gehren Thomas
Kilian Joe
Nissen Poul Erik
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