SIMBAD references

2001A&A...380..630C - Astronomy and Astrophysics, volume 380, 630-644 (2001/12-3)

Stellar parameters for Pop II A-type stars from IUE spectra and new-ODF ATLAS9 model atmospheres.

CASTELLI F. and CACCIARI C.

Abstract (from CDS):

Stellar parameters for twenty-seven field horizontal branch A-type stars, a post-AGB star (BD+32 2188), and a possible cool sdB star (BD+00 0145) were obtained by fitting the whole IUE energy distributions taken from the IUE-INES archive to the ultraviolet energy distributions predicted by new-ODF ATLAS9 model atmospheres, which include the Lyman-α H-H+ and H-H quasi-molecular absorptions near 1400Å and 1600Å. The sample of stars was extensively studied by Kinman et al. (2000A&A...364..102K), who derived stellar parameters for them by using visual observations and also an ultraviolet color index. The effective temperatures obtained by fitting the IUE spectra to the new-ODF models agree with Teff derived by Kinman et al. (2000A&A...364..102K) for most of the stars in the sample. The gravities from UV agree with those from Kinman et al. (2000A&A...364..102K) for stars hotter than about 8700K, while they are lower, on average, by 0.3dex for the cooler stars. The same discrepancy is present when logg from the ultraviolet energy distribution is compared with logg from the visible energy distribution. The difference is insensitive to reddening, microturbulent velocity, metallicity, or mixing-length parameter for the treatment of the convection.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: fundamental parameters - ultraviolet: stars

Simbad objects: 32

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