Physical conditions in the atmospheres of M giants

Astronomy and Astrophysics – Astronomy

Scientific paper

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Giant Stars, M Stars, Spectrum Analysis, Stellar Atmospheres, Stellar Evolution, Stellar Models, Atmospheric Composition, Classifications, Stellar Spectra, Stellar Temperature

Scientific paper

Results are reported for analysis of 15 spectrograms of the M giants Delta-2 Lyr and g Her, which were obtained with a reciprocal dispersion of 14 A/mm over the wavelength range from 3900 to 4700 A. Physical parameters of the stellar atmospheres at each moment of observation are determined by the curve-of-growth technique, and vibrational-excitation temperatures are estimated from alpha-system bands of TiO. For Delta-2 Lyr, a logarithmic electron pressure of -5.87 and a logarithmic gas pressure of -1.5 are computed; for g Her, the respective values are -4.85 and -0.5.

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