Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..698f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 698-701. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astrophysics
32
Abundance, Spectrum Analysis, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Commerce Lab, Interstellar Extinction, Stellar Luminosity, Stellar Mass, Stellar Temperature
Scientific paper
The star HD 161796 is one of a small group of supergiants becoming known as 89 Herculis stars or UU Herculis stars. Questions arise regarding the evolution of these stars. Bidelman (1951) had arrived at an MK classification of F3 Ib, while almost all subsequent workers had found an absolute magnitude of between -6 and -9 (indicating at least Ia) and an effective temperature characteristic of a star several subclasses cooler. The present investigation is concerned with a check of the classification at the standard MK classification dispersion. On the basis of the obtained results, Bidelman's original classification is upheld. It is believed that the MK type of HD 161796 is F3 Ib, and that this result is independent of composition effects. Attention is also given to intermediate-band photometry, and evidence derived from the star's variability.
Fernie Donald J.
Garrison Robert F.
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