Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..303g&link_type=abstract
Astronomy and Astrophysics, vol. 59, no. 3, Aug. 1977, p. 303-315. Research supported by the Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astrophysics
11
Atmospheric Models, Stellar Atmospheres, Stellar Models, Stellar Spectra, Abundance, Astronomical Catalogs, Balmer Series, Chemical Composition, Hyperfine Structure, Spectrum Analysis, Stellar Evolution, Stellar Luminosity, Stellar Mass
Scientific paper
Eight high-dispersion spectrograms of the metal-deficient star HR 8799, covering the wavelength range from 3700 to 6000 A, are analyzed using a model-atmosphere program that assumes LTE but neglects line blanketing. A 'spectroscopic' model atmosphere is obtained, but a discrepancy is found between the model-atmosphere computations and photometric observations. Unsuccessful attempts are made to fit the star's mass-luminosity ratio to various evolutionary tracks; the results indicate that the observations cannot be accounted for by a single stellar object and that the present evolutionary stage of HR 8799 requires the existence of an efficient mass-transfer process. Therefore, a binary model is proposed in which the primary had a mass of approximately 0.85 solar mass at the start of core hydrogen burning, the secondary (HR 8799) had a mass of about 0.80 solar mass at the same stage, and the primary transferred about 0.45 solar mass to HR 8799 after reaching the giant stage.
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