The Unusual Circumstellar Environment of the Evolved Star, U Equ

Details The Unusual Circumstellar Environment of the Evolved Star, U Equ The Unusual Circumstellar Environment of the Evolved Star, U Equ

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.3515b&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #35.15; Bulletin of the American Astronomical Society, Vol. 27, p.861

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In the course of a spectrosopic survey to identify cold IRAS stars, we discovered that the evolved star, U Equ, has a very peculiar optical spectrum that indicates an unusual circumstellar environment. The moderate resolution (3.5 Angstroms pixel(-1) ) spectrum has deep, yet unusually thin, molecular absoprtion features that must arise in cold gas at a large distance from the star. The optical spectrum also has striking molecular emission lines (AlO, VO, TiO) most likely due to a fluorescence mechanism. The LRS spectrum reveals silcate absorption whereas other stars with similar 12/25 microns colors have the silicate band in emission. H_2O and OH masers have been detected with a complex and varible velocity pattern. We suggest that the star is of a warm spectral type, G to early K, and that it has an edge-on dusty disk with an extended and possibly non-spherical circumstellar shell. We present optical spectra, and J- and K-band images and photometry.

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