Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jkas...39..125k&link_type=abstract
Journal of the Korean Astronomical Society, vol. 39, no. 4, pp. 125-128
Astronomy and Astrophysics
Astronomy
Stars:Temperature, Stars:Surface Gravity, Stars:Atmosphere
Scientific paper
In order to determine the precise effective temperature and surface gravity of warm stars, all synthetic spectral lines in the wavelength range of 4000-5700Å with T=6000-7750 K, and log g=3.5, 4.0, and 4.5 for [M/H]=0.0, V_{rot}=10 km s^{-1}, and V_{tubl}=2 km s^{-1} were calculated using the SYNSPEC package (Hubeny, et al., 1995) and the Kurucz (1995) model. Then, the depth-ratios for all line pairs were investigated and we selected two and six depth-ratios appropriate for the surface gravity and temperature indicators, respectively. We plotted six grids with X- and Y-axes for the depth-ratios of surface gravity and temperature, respectively, for the simultaneous estimation of these two atmospheric parameters. This method was applied to the spectum of δ Scu for the determination of its temperature and surface gravity simultaneously.
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