South galactic CAP G and K stars with infrared excesses

Details South galactic CAP G and K stars with infrared excesses South galactic CAP G and K stars with infrared excesses

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..638w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 1, 1991, p. 638-643.

Astronomy and Astrophysics

Astronomy

15

G Stars, Infrared Radiation, K Stars, Pre-Main Sequence Stars, Variable Stars, Binary Stars, Infrared Astronomy Satellite, Infrared Photometry, Stellar Evolution

Scientific paper

Near-infrared and IRAS photometry is discussed for 13 G and K stars in the south galactic cap. Five of them show a strong flux excess at 12 microns as would be expected from dust shells emitting at temperatures of several hundred Kelvin. One of them (XY Tau) has previously been classified as a 206-d Mira, but the new observations suggest it is actually a variable F or G star. The most likely explanation is that the original classification was wrong and that it is in fact a premain-sequence star. The other four stars are either in very unusual evolutionary states or they are binary systems. The presence of long-term variations in the near-infrared flux of the flare star CC Eri is reported. The colors are redder when the star is fainter, and the variations might be associated with the star spot cycle.

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