Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apjs...59..769s&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 59, Dec. 1985, p. 769-784.
Astronomy and Astrophysics
Astrophysics
73
B Stars, Hertzsprung-Russell Diagram, Open Clusters, Stellar Evolution, Stellar Rotation, Stellar Spectra, Color-Magnitude Diagram, H Alpha Line, Stellar Spectrophotometry
Scientific paper
Rotational velocities and spectral types have been determined for Be stars in 12 open clusters in both the northern and the southern sky, and color-magnitude or H-R diagrams constructed for each from available photometric data. The location of the Be stars in the color-magnitude diagrams shows again that Be stars may exist in various evolutionary stages, including the essentially unevolved stage. Although many Be stars are considerably off the zero-age main sequence, it does not necessarily follow that these are in the core-contraction stage because circumstellar reddening and rotationally induced gravity darkening of the underlying star will also move stars to the right of the main sequence in a colormagnitude diagram. The evolutionary status of Be stars seems still to be quite uncertain.
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