Surface distribution of M stars with different IRAS colour |
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| Authors: | K Ishida M Othman |
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| Institution: | (1) Tokyo Astronomical Observatory, University of Tokyo, Mitaka, Tokyo, Japan;(2) Physics Department, National University of Malaysia, Bangi, Malaysia |
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| Abstract: | The surface distribution of M stars is studied by differentiating them according to whether they show a circumstellar dust shell (CS) or not. Analysis shows that galactic latitudinal and longitudinal distributions are not determined by spectral subclasses alone. The study also indicates that M-type stars with CS have higher luminosities in the K band than those without CS. The M stars used in the study are obtained from theTwo-Micron Sky-Survey Catalogue (IRC) which is a most unbiased sample with respect to the interstellar extinction. The CS feature is identified by the ratio of flux densities at 12 and 25  m in the IRAS point source catalog. |
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