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Astron. Astrophys. 344, 918-922 (1999)

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IRAS 03313+6058: an AGB star with 30 micron emission *

B.W. Jiang 1,2, R. Szczerba 2,3 and S. Deguchi 4

1 Beijing Astronomical Observatory, Chinese Academy of Sciences, Datun Rd. No.20(A), Beijing 100012, P.R. China
2 N. Copernicus Astronomical Center, ul. Rabiaska 8, PL-87 100 Toru, Poland
3 Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada
4 Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-1305, Japan

Received 25 September 1998 / Accepted 13 January 1999

Abstract

This paper reports a detection of the 30 micron emission feature from the C-rich Asymptotic Giant Branch (AGB) star IRAS 03313+6058 based on the ISO-SWS observation. Modeling of the spectral energy distribution shows that this emission starts at about 20 micron and possibly extends to the limit (45 micron) of the observation. By assuming MgS as the carrier, the number ratio of Sulfur atoms in MgS to Hydrogen atoms in total, n(S)/n(H), is 3.0[FORMULA]10-6 as derived from model fitting. A comparison is made between this emission feature and other AGB and post-AGB objects.

Key words: stars: individual: IRAS 03313+6058 – stars: circumstellar matter – stars: chemically peculiar – stars: AGB and post-AGB

* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with participation of ISAS and NASA

Send offprint requests to: Biwei Jiang (jiang@class1.bao.ac.cn)

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© European Southern Observatory (ESO) 1999

Online publication: March 29, 1999
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