Two Micron All Sky Survey, Infrared Astronomical Satellite, and Midcourse Space Experiment Color Properties of Intrinsic and Extrinsic S Stars

Details Two Micron All Sky Survey, Infrared Astronomical Satellite, and Midcourse Space Experiment Color Properties of Intrinsic and Extrinsic S Stars Two Micron All Sky Survey, Infrared Astronomical Satellite, and Midcourse Space Experiment Color Properties of Intrinsic and Extrinsic S Stars

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....132.1468y&link_type=abstract

The Astronomical Journal, Volume 132, Issue 4, pp. 1468-1474.

Astronomy and Astrophysics

Astronomy

10

Stars: Circumstellar Matter, Infrared: Stars, Stars: Agb And Post-Agb, Stars: Evolution

Scientific paper

We attempt to select new candidate intrinsic and extrinsic S stars in the General Catalogue of Galactic S Stars (GCGSS) by combining data from the Two Micron All Sky Survey, the Infrared Astronomical Satellite, and the Midcourse Space Experiment. Catalog entries are cross-identified, yielding 528 objects, out of which 29 are known extrinsic S stars and 31 are known intrinsic S stars. Their color-color diagrams, (H-[12])-(K-[12]) and (K-[12])-(J-[25]), are drawn and used to identify a new sample of 147 extrinsic and 256 intrinsic S star candidates, while the nature of 65 stars remains identified. We infer that about 38%+/-10% of the GCGSS objects are of extrinsic type. Moreover, we think that colors such as J-[25] can be used to split off the two categories of S stars, while single colors are not appropriate. The color-color diagrams, such as (H-[12])-(K-[12]) and (K-[12])-(J-[25]), are proven to be powerful tools for distinguishing the two kinds of S stars.

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