Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1010y&link_type=abstract
Astronomical Journal, vol. 84, July 1979, p. 1010-1019.
Astronomy and Astrophysics
Astronomy
19
S Stars, Star Distribution, Stellar Evolution, Variable Stars, Astronomical Catalogs, Celestial Sphere, M Stars, Milky Way Galaxy, Mira Variables, Red Giant Stars, Stellar Magnitude
Scientific paper
The surface distribution of all known stars of type S, which number more than 700, indicates that most of them belong to the older Population I (also known as the young disk population). They are not as concentrated to the galactic plane as extreme Population I objects, and they show no statistically significant association with interstellar clouds. For the subset of S stars of known visual magnitude, distances were computed so that their distribution in the Galaxy could be studied. The non-Mira S stars, for an absolute magnitude of -1, have a mean distance from the plane of 200 pc and show no sign of spiral structure; both of these characteristics are consistent with the older Population I. Since the mean absolute magnitude of the S-type Mira variables is quite uncertain, their volume distribution has been studied for a range of values of absolute magnitude. It is concluded that the mean value at maximum light is most likely in the range from -1.5 to -2.0.
Wing Robert F.
Yorka Sandra B.
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