NDLI: B and Be-stars in the young open stellar clusters NGC 659 and NGC 7419

Content Provider	Springer Nature Link
Author	Malchenko, S. L. Tarasov, A. E.
Copyright Year	2011
Abstract	The populations of B and Be-stars in the young open clusters NGC 7419 and NGC 659 are studied. Lowresolution spectral observations in the region of the Hα line are used to study 34 members of NGC 7419 and additional spectra in the range λ3700-6200 Å are obtained for 12 stars. During the period of our observations, four previously identified Be-stars manifested an absorption profile for the Hα line. Emission in the Hα line is observed in the spectra of 21 objects. The members of the cluster NGC 7419 are classified as to spectral type. The position of the Be-stars on a two-color IR diagram and a comparison with the position of the objects in other clusters with similar ages cast doubt on the existence of two starformation waves. Moderate resolution spectra were obtained for 22 stars in the cluster NGC 659 over wavelengths of λ4050-5200 Å and for 7 objects in the neighborhood of the Hα line. Emission is observed in both the Hα and Hβ lines for two of the five Be-stars that were studied, while faint emission appears only in the Hα line in one of the stars. The other members of the cluster show no signs of emission in these spectra. Teff, log g, and Vsini are estimated for the observed stars. It is found that 5 of the objects are not members of the cluster.
Starting Page	52
Ending Page	67
Page Count	16
File Format	PDF
ISSN	05717256
Journal	Astrophysics
Volume Number	54
Issue Number	1
e-ISSN	15738191
Language	English
Publisher	Springer US
Publisher Date	2011-03-26
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	stars spectra— young stellar clusters NGC 659, NGC 7419 Astronomy, Observations and Techniques Extraterrestrial Physics, Space Sciences Astrophysics and Astroparticles Astronomy, Astrophysics and Cosmology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics

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