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Title:
On the absolute brightnesses and masses of early-type stars
Authors:
Schoenberner, D.; Harmanec, P.
Affiliation:
AA(Astrophysikalisches Institut Potsdam, Potsdam, Germany), AB(Astrophysikalisches Institut Potsdam, Potsdam, Germany)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 294, no. 2, p. 509-514 (A&A Homepage)
Publication Date:
02/1995
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BRIGHTNESS, EARLY STARS, ECLIPSING BINARY STARS, STELLAR MASS, STELLAR MODELS, CALIBRATING, SOLAR NEIGHBORHOOD, STAR CLUSTERS, STELLAR EVOLUTION, STELLAR TEMPERATURE
Bibliographic Code:
1995A&A...294..509S

Abstract

A new empirical brightness calibration of early-type stars is presented, entirely based on accurate binary data. This calibration agrees remarkably well with the predictions of the most recent stellar models, but disagrees completely with all other currently used calibrations for early-type stars. The binaries used to derive the new calibration cover a range of masses from about 1.3 solar mass to 25 solar mass, corresponding to a temperature range from 6,700 K to 38,000 K. Over the whole mass range, no systematic differences between the observed and evolutionary masses were found. The application to the alpha Per cluster gives a distance modulus which agrees perfectly with that derived by comparing its lower main-seqeunce to stars with known parallaxes.

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