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Red supergiants in the LMC – III: luminous F and G stars by M.O. Oestreicher; Th. Schmidt-Kaler is a Physics and Astronomy article available to read on EtoBox.

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New BV RI observations for 40 and spectrophotometric measurements for 23 F to G LMC supergiant candidates (and 3 galactic F to G supergiants) are presented. The errors of the BV RI data are 0.01 to 0.03 mag in most cases. The wavelength range of the spectra is 3400 to 6400 Å, their resolution 10 Å. The mean error of the fluxes is 0.03 mag. Spectral indices measuring the strengths of the Hβ, Hγ, Hδ, NaD and CaII H+K lines, the CHα0 and CNβ0 bands, of the Balmer jump and the slope of the continuum redwards are discussed as measures of effective temperature and luminosity on the basis of galactic stars with accurate MK types and parallaxes. The Hγ line and the continuum gradient are very good temperature criteria, the CHα0 band and especially the Balmer jump for luminosity. The luminosity classification given for F to G supergiant candidates in the LMC in the literature is often doubtful. 5 of the 23 stars observed spectrophotometrically turn out to be probably galactic foreground dwarfs on the basis both of the Balmer jump and the comparison of their flux distributions with synthetic ones based on the Kurucz model atmospheres. Surface gravities derived purely on the basis of flux dis

Who reads Red supergiants in the LMC – III: luminous F and G stars?

Author

M.O. Oestreicher; Th. Schmidt-Kaler

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0004-6337)

Published

1999

Language

EN

Field

Physics and Astronomy (Physical Sciences)