Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.237..219l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 237, March 1, 1989, p. 219-238.
Astronomy and Astrophysics
Astronomy
19
Infrared Photometry, Infrared Spectroscopy, Milky Way Galaxy, S Stars, Supergiant Stars, Absorption Spectra, M Stars, Mira Variables, Spectral Bands
Scientific paper
Infrared (JHKL) photometry and spectroscopy (5200-7700 A, 6 A resolution) is given for 72 stars classed as type S by Westerlund and Olander. There are 38 S stars, 26 M stars, of which most are supergiants, and eight stars without prominent absorption bands. The S stars are predominantly of the nearly pure S type ( S index approximately 6) and represent a substantial addition to the known sample of such stars. Several probable Mira variables and three stars with strong Li I 6707 A are included. A wide range in LaO strength for stars of similar temperature and ZrO strength may result from differing ratios of heavy to light s-process elements. A possible dependence of Na D strength on luminosity is found. The galactic distribution of the S stars is not significantly different from that of carbon stars in the same field, excluding the suggestion that these S stars are of much higher mass than carbon stars. The infrared colors, taken in conjunction with IRAS data, reveal heavy interstellar reddening as well as circumstellar shells around many stars of all three groups. One of the bandless stars, WO48, has a particularly extensive shell.
Catchpole Robin M.
Evans Tom Lloyd
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