Astrophysics and Space Science

, Volume 148, Issue 2, pp 239–247 | Cite as

Surface distribution of M stars with different IRAS colour

  • K. Ishida
  • M. Othman


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 μm in the IRAS point source catalog.


Colour Dust Point Source Flux Density Analysis Show 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • K. Ishida
    • 1
  • M. Othman
    • 2
  1. 1.Tokyo Astronomical ObservatoryUniversity of TokyoMitaka, TokyoJapan
  2. 2.Physics DepartmentNational University of MalaysiaBangiMalaysia

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