Classification of Very Red Stars Using Narrowband Colors

Details Classification of Very Red Stars Using Narrowband Colors Classification of Very Red Stars Using Narrowband Colors

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..684d&link_type=abstract

Astronomical Journal v.99, p.684

Astronomy and Astrophysics

Astronomy

Stars: Late-Type, Stars: Red Dwarfs

Scientific paper

A classification technique for faint, very red stars is described, based on two composite colors, derived from flux measurements in six narrowbands in the visual and red parts of the spectrum. One of the composite colors, ST, is an M spectral type indicator, common to both dwarfs and giants. It can be used to predict the spectral types to within half a class. The other color, DG, is a dwarf-giant discriminator for spectral types later than about M4, and whose power increases for the later types, where most other methods fail. It reflects the differences in blanketing between the late-M type dwarfs and the giants. The method can be generalized to other, similar colors, depending on the data and task at hand. It should be useful in surveys for extreme low-mass dwarfs, or alternatively, for luminous red giants, or other kinds of objects. We illustrate the application of the method on an example of a very red star identified earlier by Blair and Long, and show it to be a distant red giant.

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