New Version of the Pulsating Photospheres Method: Multiphase Temprature Measurements of Cepheids

Rastorguev, A.S.; Zabolotskikh, M.V.; Lazovik, Y.A.; Gorynya, N.A.; Berdnikov, L.N.

Авторы: Rastorguev A.S., Zabolotskikh M.V., Lazovik Ya A., Gorynya N.A., Berdnikov L.N.
Журнал: Astrophysical Bulletin
Том: 77
Номер: 2
Год издания: 2022
Первая страница: 144
Последняя страница: 149
DOI: 10.1134/S1990341322020079
Аннотация: We propose a new version of the (Baade–Becker–Wesselink) pulsating photospheres method based on direct spectral measurements of the effective temperatures of Cepheids carried out in different pulsation phases. By comparing the effective temperatures calculated using normal color calibrations with real spectroscopic estimates, we were able to not only determine the color excess with an accuracy of the order of mag, but also use all the measured effective temperature values to derive a new color calibration for the effective temperature of high luminosity stars, also taking into account the differences in metallicity and surface gravity : logTeff = 3.88 – 0.20(B – V)0 + 0.026(B –V) + 0.009log g – 0.010(B – V)0log g –0.051[Fe/H] + 0.051(B – V)0[Fe/H], the relative accuracy of which is approximately . In addition, the complete identity of the two main versions of the Baade–Becker–Wesselink method was proved: the surface brightness method (SB), first proposed by Barnes and Evans in 1976, and the maximum likelihood method (or light-curve modeling method) proposed by Balona in 1977 and later improved by Rastorguev and Dambis in 2010. This approach consists of using significantly nonlinear color calibrations for and bolometric correction and is easily applicable to the surface brightness method. This method is also applicable in studies of other types of pulsating variable stars, e.g., RR Lyrae, Mirae and Sct type variables with knowneffective temperature estimates.
Добавил в систему: Расторгуев Алексей Сергеевич

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New Version of the Pulsating Photospheres Method: Multiphase Temprature Measurements of Cepheidsстатья Исследовательская статья

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