Abstract
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 \(T_{\textrm{eff}}\) were obtained through a non-LTE analysis of their atmospheres. Applying this method to our sample of objects has allowed the cluster age, \(t=22\pm 1\) Myr, and the cluster distance modulus, \((m-M)_{0}=12.4^{m}\), 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.
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ACKNOWLEDGMENTS
I am grateful to the anonymous referee for the detailed analysis of the text of the paper that significantly influenced the quality of the material presentation and the conclusions.
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Tarasov, A.E. Spectroscopy of B and Be Stars in the Young Open Star Cluster NGC 581 (M 103). Astron. Lett. 46, 473–481 (2020). https://doi.org/10.1134/S1063773720070087
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DOI: https://doi.org/10.1134/S1063773720070087