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Astron. Astrophys. 335, 243-247 (1998)


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NGC 7129 FIRS 2: an intermediate-mass counterpart of Class 0 objects

C. Eiroa 1, J. Palacios 1 and M.M. Casali 2

1 Departamento Física Teórica C-XI, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain (carlos,javier@xiada.ft.uam.es)
2 Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK (M.Casali@roe.ac.uk)

Received 1 October 1997 / Accepted 20 March 1998

Abstract

We present JCMT (sub)millimetre observations of the young source NGC 7129 FIRS 2 and HIRAS maps of the whole NGC 7129 region. The total integrated luminosity of FIRS 2 is [FORMULA] 430 [FORMULA]. Its spectral energy distribution is described by a single-temperature grey body with [FORMULA] and [FORMULA]. The total mass is found to be [FORMULA]. These and other properties indicate that FIRS 2 is an intermediate-mass counterpart of the low-mass Class 0 protostellar objects; in this sense, FIRS 2 is probably the youngest intermediate-mass object we know at present. The far-infrared emission of NGC 7129 is dominated by two sources: FIRS 1, which is located toward the HAeBe star LkH [FORMULA] 234, and FIRS 2. The cavity observed in the optical NGC 7129 reflection nebulosity and in radio emission lines is clearly observed in the HIRAS maps, particularly in the 25 µm band. The total estimated luminosity of the region is [FORMULA] 4.5 103 [FORMULA], consistent with the idea that the dust is heated by the cluster of HAeBe stars in NGC 7129.

Key words: stars: formation – ISM: individual objects: NGC 7129 FIRS 2 – infrared: stars

Send offprint requests to: C. Eiroa

© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998

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