Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1801w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, June 1988, p. 1801-1816.
Astronomy and Astrophysics
Astronomy
69
Astronomical Catalogs, Carbon Stars, Color-Color Diagram, Infrared Astronomy Satellite, M Stars, Variable Stars, Binary Stars, Late Stars, Silicon Carbides
Scientific paper
Three common types of stars were selected from the IRAS Point Source Catalog: IRAS sources associated with The Bright Star Catalogue, sources associated with the General Catalogue of Variable Stars and having a spectral type M (implying oxygen rich), and sources associated with Stephenson's carbon star catalog. Those stars that had reliable fluxes at 12, 25, and 60 μm were included in the [12]-[25], [25]-[60] diagram. Similarly, color-color diagrams were made for samples of stars selected from the IRAS LRS Atlas, with featureless, O-rich, and C-rich spectra. From the total sample of 4493 stars, it was found that the three types tended to separate in the color-color diagrams, such that O-rich stars were redder in [12]-[25] than the other groups, and C-rich stars were redder in [25]-[60] than the other groups. "Occupation" zones containing around 70% of the stars in each group were defined. Of 4300 unassociated IRAS point sources with reliable fluxes at 12, 25, and 60 μm, almost 50% are late-type stars, judged from the color-color diagram.
Cohen Martin
Walker Helen J.
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