Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..404c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 404-411.
Astronomy and Astrophysics
Astronomy
4
Giant Stars, Infrared Photometry, Interstellar Extinction, M Stars, Reflection Nebulae, Stellar Envelopes, Color-Color Diagram, Infrared Astronomy Satellite, Infrared Spectroscopy, Late Stars, Silicates
Scientific paper
HR 3126 is a unique M giant star embedded in the bipolar reflection nebula IC 2220. In this paper we present new photometric and spectroscopic observations of HR 3126 and combine them with existing data from the literature in an extensive reappraisal of the star's properties at infrared wavelengths. The spectral energy distribution is consistent with an optical classification of M0-3 II with infrared excess. The dust shell cannot be fitted by a single-temperature blackbody: at least three components are required, with temperatures in the range 35-1300 K. On the basis of spectroscopy at 1-4 and 7-25 microns, combined with an assessment of various color-color diagrams, we are able to reject the hypothesis that HR 3126 is carbon-rich. Weak silicate emission features are detected at 10 and 19 microns, and a previous report of silicon carbide emission at 11.2 microns is not substantiated. It seems likely that HR 2136 is in a phase of advanced and rapid postmain-sequence evolution, possibly beginning its ascent of the asymptotic giant branch.
Aitken David K.
Chiar Jean E.
Roche Patrick F.
Smith Cotton H.
Walker Helen J.
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