Spectroscopy of B and Be stars in the diffuse stellar clusters NGC 6871 and NGC 6913 |
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Authors: | S L Malchenko A E Tarasov |
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Institution: | (1) Vernadskii Tavrida National University, Simferopol, Ukraine;(2) Scientific Research Institute Crimean Astrophysical Observatory, Crimea, Ukraine |
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Abstract: | This is a study of the population of B and Be stars in the young, relatively poor, diffuse stellar clusters NGC 6871 and NGC
6913. High resolution spectra are used to study the Hα line of eleven stars in order to detect emission. Emission profiles
were found for three stars in the cluster NGC 6871; one of these is a known WR-star and the Be-star BD +35°3956 demonstrates
the transition from the B to the Be phase. Spectra of seven of the B stars revealed no traces of emission in the Hα line.
During the time of our observations, the Be star V1322 Cyg in the cluster NGC 6913 had a strong emission Hα line profile with
substantial variability in intensity and equivalent width. Moderate resolution spectra of seven stars in the cluster NGC 6871
over wavelengths of 4420-4960 ? and ten stars in the cluster NGC 6913 over wavelengths of 4050-5100 ? are used to classify
the series of B and Be stars spectrally and to estimate their T
eff
and log g. It was found that three of the stars are not members of the clusters NGC 6871 or NGC 6913.
Translated from Astrofizika, Vol. 52, No. 2, pp. 257–274 (May 2009). |
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Keywords: | stars spectra-- stellar clusters NGC 6871 NGC 6913 |
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