Accession Number:

AD0614523

Title:

COMPARISON BETWEEN MODEL ATMOSPHERES AND SPECTRA FROM EARLY-TYPE STARS,

Descriptive Note:

Corporate Author:

HARVARD COLL OBSERVATORY CAMBRIDGE MASS

Personal Author(s):

Report Date:

1964-08-22

Pagination or Media Count:

17.0

Abstract:

To assist in the interpretation of ultraviolet continuum observations, observational features are presented of a grid of non-grey model atmospheres in strict radiative equilibrium which have effective temperatures in the range 10000K to 20000K and surface gravities 1000 and 10000. For three models, the blended wings of the higher Balmer and Lyman hydrogen lines are added and include in an approximate way further effects of line blanketing in the ultraviolet. Finally, a preliminary calculation is presented of the effect of departures from L.T.E. on the continuous flux. To examine the validity of the models, the predicted continuous flux and predicted line profiles are compared with the corresponding observed quantities for Vega and Sirius. The question of discrepancies between theory and observations in the ultraviolet is considered from the viewpoint of these new calculations, and find generally good agreement with recent observations made by T. Stecher. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE