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Issue A&A
Volume 419, Number 3, June I 2004
Page(s) L39 - L42
Section Letters
DOI 10.1051/0004-6361:20040138



A&A 419, L39-L42 (2004)
DOI: 10.1051/0004-6361:20040138

Letter

The infrared properties of the new outburst star IRAS 05436-0007 in quiescent phase

P. Ábrahám1, Á. Kóspál2, Sz. Csizmadia1, A. Moór1, M. Kun1 and G. Stringfellow3

1  Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary
2  Department of Astronomy, Eötvös Loránd University, PO Box 32, 1518 Budapest, Hungary
3  Center for Astrophysics & Space Astronomy, University of Colorado at Boulder, 389 UCB, Boulder, CO 80309-0389, USA

(Received 12 March 2004 / Accepted 10 April 2004)

Abstract
We compiled and investigated the infrared/sub-mm/mm SED of the new outburst star IRAS 05436-0007 in quiescent phase. The star is a flat-spectrum source, with an estimated total luminosity of $L_{\rm bol} \approx 5.6~L_{\sun}$, typical of low-mass T Tauri stars. The derived circumstellar mass of $0.5~M_{\sun}$ is rather high among low-mass YSOs. The observed SED differs from the SEDs of typical T Tauri stars and of 4 well-known EXors, and resembles more the SEDs of FU Orionis objects indicating the presence of a circumstellar envelope. IRAS 05436-0007 seems to be a class II source with an age of approximately 4  $\times$ 105 yr. In this evolutionary stage an accretion disk is already fully developed, though a circumstellar envelope may also be present. Observations of the present outburst will provide additional knowledge on the source.


Key words: stars: formation -- stars: circumstellar matter -- stars: individual: IRAS 05436-0007 -- infrared: stars

Offprint request: P. Ábrahám, abraham@konkoly.hu

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© ESO 2004


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