Spectroscopy of B and Be Stars in the Young Open Star Cluster NGC 581 (M 103)

Based on moderate-resolution spectra in the range 4200–5200 Å, we have studied B and Be stars in the young open star cluster NGC 581. The temperatures of the program stars have been derived by the differential method with the choice of simple spectroscopic parameters for a number of lines and their...

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Bibliographic Details
Published inAstronomy letters Vol. 46; no. 7; pp. 473 - 481
Main Author Tarasov, A. E.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.07.2020
Springer Nature B.V
Subjects
Astronomy
Astrophysics and Astroparticles
B stars
Emission analysis
Emission spectra
Observations and Techniques
Parameters
Physics
Physics and Astronomy
Spectroscopy
Spectrum analysis
Star clusters
open star clusters
stars
Be stars
spectroscopic observations
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Summary:Based on moderate-resolution spectra in the range 4200–5200 Å, we have studied B and Be stars in the young open star cluster NGC 581. The temperatures of the program stars have been derived by the differential method with the choice of simple spectroscopic parameters for a number of lines and their comparison with the analogous parameters of a large sample of B stars for which accurate estimates of were obtained through a non-LTE analysis of their atmospheres. Applying this method to our sample of objects has allowed the cluster age, Myr, and the cluster distance modulus, , to be determined with confidence. We have studied the spectroscopic variability of the emission spectra for four Be stars in the cluster. All of them are shown to have a long-term variability of the profiles typical of classical Be stars.
ISSN:1063-7737
1562-6873
DOI:10.1134/S1063773720070087