Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ap.....51..250m&link_type=abstract
Astrophysics, Volume 51, Issue 2, pp.250-262
Astronomy and Astrophysics
Astrophysics
Stars: Spectra&Mdash, Stellar Cluster H/&Chi, Per
Scientific paper
High dispersion CCD spectra are used to study the profiles of the Hα and Hβ lines of 48 stars in early spectral classes in the young diffuse binary cluster h/χ Per. In addition, moderate resolution spectra of 15 B and Be stars were taken over the interval 4400 4960 Å. One or, possibly, two new Be stars are discovered. The major parameters of the Hα line are measured for the observed B and Be stars. The spectra over 4400 4960 Å are used to estimate Teff, logg, and υ sin i. No traces of emission are detected in the Hα line profiles for 28 of the stars and emission is observed in the Hα line for 20. During our observations an absorption profile of the Hα line was observed for some of the stars, such as Oo146, Oo566, Oo922, and Oo1268, although they have previously been identified as Be stars. A significant long-term variability of the Hα line is discovered for the Be stars Oo1161 and Oo2242. Oo2371 manifests a variability in its faint emission spectrum which is typical of close binary systems that include a Be star.
Malchenko S. L.
Tarasov Anatolii E.
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