Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..420i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 420-423.
Astronomy and Astrophysics
Astronomy
4
Astronomical Catalogs, Infrared Astronomy, Infrared Astronomy Satellite, Satellite Observation, Stellar Color, Stellar Luminosity, Dwarf Stars, M Stars, Stellar Magnitude
Scientific paper
An analysis of IRAS observations, especially at 12 microns, of stars in the Catalog of Nearby Stars by Gliese (1969) is presented and compared with the results for stars in the Bright Star Catalog presented by Waters et al. (1987). It is found that the relationships suggested by the above authors between (V - /12/) and (B - V) or (R - I) hold good also for Gliese stars which are mostly dwarfs. Based on these relationships, the percentages of stars with /12/ excess are estimated as a function of spectral type. In general, the percentage of stars with excess greater than 0.3m is less than 5 percent except for A stars and possibly M stars. For M stars, the excess is mostly for the late spectral subtypes M4 - M8. Making use of the trigonometric parallaxes given by Gliese, a table of absolute 12 magnitude is also given as a function of spectral sub-type for dwarfs A to M.
Iyengar V. K. K.
Rengarajan T. N.
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