Study of absolute magnitudes of B and Be stars

Details Study of absolute magnitudes of B and Be stars Study of absolute magnitudes of B and Be stars

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..107b&link_type=abstract

In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 107-110 (SEE N82-30146 20-88)

Astronomy and Astrophysics

Astronomy

1

Astrometry, B Stars, European Space Programs, Satellite Observation, Stellar Magnitude, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Rotation, Stellar Spectra

Scientific paper

Determination of Be star absolute magnitudes, and the role of the Hipparcos satellite in such determinations, are discussed. Problems include the difficulty of determining interstellar absorption and the effect of emissions on spectral classification and statistical studies. Neither luminosity class nor rotation account for Be magnitudes. The Be magnitudes could be greater than those of B stars because of energy redistribution in Be envelopes. Luminosity could be influenced by hot circumstellar zones (more important for Be than for B stars). The B-Be differences could be due to evolutionary factors, e.g., Be stars corresponding to a post main sequence stage of B stars. Homogeneous spectroscopic data, interstellar reddening measurements, and ground based investigation of emission spectra features and energy distribution of the envelope are advocated.

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