MSX And IRAS Two-Color Diagrams For Late-Type Stars

Details MSX And IRAS Two-Color Diagrams For Late-Type Stars MSX And IRAS Two-Color Diagrams For Late-Type Stars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21349126c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #491.26; Bulletin of the American Astronomical Society, Vol. 41, p.471

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We present the results of a statistical study of late-type, oxygen-rich, asymptotic giant branch (AGB) stars and their circumstellar envelopes (CSEs) using color-color diagrams based on data from the Infrared Astronomical Satellite (IRAS) and the Midcourse Space Experiment (MSX). The study of the two-color diagram of CSEs using data from the IRAS survey (van der Veen and Habing 1988, A & A, 194, 125) was a revolutionary step in the understanding and characterization of late-type star CSEs, their mass-loss properties, and their evolution. We outline the steps of cross-identification, selection, and definition of distinct regions in MSX color-color diagrams in relation to those in the IRAS diagrams, and demonstrate that an MSX color-color diagram is a useful and sound translation for the IRAS diagram in the study of oxygen-rich AGB CSEs. This is a favorable result as it allows the selection of stars, based only on MSX data, for further studies, such as surveys for masers in circumstellar shells and in regions where IRAS was confused.
This research was supported by the Research Experience for Undergraduate Program of the National Science Foundation, and was completed at the National Radio Astronomy Observatory in Socorro, New Mexico.

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