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2010MNRAS.402.1369L - Mon. Not. R. Astron. Soc., 402, 1369-1379 (2010/February-3)
Accurate fundamental parameters for A-, F- and G-type supergiants in the solar neighbourhood.
LYUBIMKOV L.S., LAMBERT D.L., ROSTOPCHIN S.I., RACHKOVSKAYA T.M. and POKLAD D.B.
Abstract (from CDS):
A new Teff scale for A5-G5 stars of luminosity classes Ib-II is presented. Spectral subtypes and luminosity classes of several stars are corrected. Combining the Teff and logg with evolutionary tracks, stellar masses and ages are determined; a majority of the sample has masses between 4 and 15M☉and, hence, their progenitors were early to middle B-type main-sequence stars.
Using FeII lines, which are insensitive to departures from local thermodynamic equilibrium, the microturbulent parameter Vt and the iron abundance logε(Fe) are determined from high-resolution spectra. The parameter Vt is correlated with gravity: Vt increases with decreasing logg. The mean iron abundance for the 48 supergiants with distances d < 700 pc is logε(Fe) = 7.48±0.09, a value close to the solar value of 7.45±0.05, and thus the local supergiants and the Sun have the same metallicity.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): stars: abundances - stars: fundamental parameters - supergiants
Simbad objects: 72
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