Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.184..405l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 184, Aug. 1978, p. 405-422.
Astronomy and Astrophysics
Astronomy
32
Line Shape, Near Infrared Radiation, Stellar Luminosity, Stellar Spectra, Supergiant Stars, Absorption Spectra, Hertzsprung-Russell Diagram, Infrared Spectroscopy, Ionized Gases, Iron, Stellar Atmospheres
Scientific paper
The spectral evolution of the Ia-O supergiant HR 8752 from 1950 to 1977 is discussed on the basis of near-IR spectroscopy performed in 1977 and plate material for the years 1965, 1969, 1973, 1974, and 1976. It is demonstrated observationally that HR 8752 has developed into a spectroscopic twin of the F8 Ia supergiant Rho Cas and returned close to the spectral type of G0 Ia assumed in 1950, that HR 8752 migrated slowly to the right across the H-R diagram in the intervening 30 yr to reach a spectral type of K2-K5 Ia in 1973, that a faster return to an earlier spectral type commenced after 1973, and that the star may now be in its 'equilibrium' position. The data suggest that a shell of gas was ejected and that HR 8752 underwent a 'flare' in the period between 1973 and 1976. Possible models for the spectrum changes are examined, and a tentative explanation is considered for the ionized gas shell around the star.
Lambert David L.
Luck Earle R.
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