A comparison between the observed and predicted UV line blocking for blanketed model atmospheres of early type stars

Details A comparison between the observed and predicted UV line blocking for blanketed model atmospheres of early type stars A comparison between the observed and predicted UV line blocking for blanketed model atmospheres of early type stars

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91...32c&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 1-2, Nov. 1980, p. 32-35. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astronomy

9

Atmospheric Models, B Stars, Early Stars, Stellar Spectra, Ultraviolet Astronomy, Giant Stars, Main Sequence Stars, Stellar Temperature, Supergiant Stars, Ultraviolet Spectra

Scientific paper

For early B main-sequence and giant stars the observed near-UV blocking factors are larger than those predicted by blanketed model atmospheres with a microturbulence of 2 km/sec. Better agreement would be reached if a microturbulence of 4 to 5 km/sec were adopted. Evidence was found that the line opacities due to doubly ionized metals are unsufficiently accounted for in the model atmospheres. For late B main-sequence and giant stars the observed near-UV blocking is smaller than predicted which points to an over-estimation of the line opacities due to singly ionized metals. The observed blocking in early B supergiants is much larger than predicted and would require a microturbulence of 10 km/sec at least. If this large blocking extends to the far UV, the energy distribution given by the models might be changed drastically.

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