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Spectral analysis of LBV stars in M31: AF And and Var 15

Published online by Cambridge University Press:  23 January 2015

A. F. Valeev ,
O. Sholukhova  and
S. Fabrika
A. F. Valeev
Affiliation:
Special Astrophysical Observatory, Russia email: [email protected] Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
O. Sholukhova
Affiliation:
Special Astrophysical Observatory, Russia email: [email protected]
S. Fabrika
Affiliation:
Special Astrophysical Observatory, Russia email: [email protected] Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
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Abstract

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We study spectra of two bona fide LBV stars in M31: AF And and Var 15. The spectra were obtained with the 6-m telescope (Russia) from 2005 to 2012. The model spectra were calculated with the CMFGEN code. We have not found strong changes in the spectra of the LBV stars in that time interval, however a certain variability has been detected. We estimate the star and wind parameters, such as luminosity, temperature, raduis, mass loss rate, escape velocity, hydrogen content, and reddening. We study the stars on the Hertzsprung-Russell diagram and find their initial masses using evolutionary tracks by Meynet et al. (1994).

Keywords

stars: individual (AF And, Var 15)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 146 - 147
Copyright
Copyright © International Astronomical Union 2015 

References

Afanasiev, V. L. & Moiseev, A. V. 2005, Astronomy Letters 31, 194Google Scholar
Hillier, D. J. & Miller, D. L. 1998, ApJ 496, 407CrossRefGoogle Scholar
Meynet, G., Maeder, A., Schaller, G., Schaerer, D., & Charbonnel, C. 1994, A&AS 103, 97Google Scholar