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Astron. Astrophys. 333, 1016-1024 (1998)

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PP 13S, a young, low-mass FU Orionis-type pre-main sequence star

Göran Sandell 1 and Colin Aspin 2

1 Joint Astronomy Centre, 660 N. A'ohkü Place, Hilo, HI 96720, USA
2 Nordic Optical Telescope, Apartado 474, E-38700 Santa Cruz de la Palma, Canarias, Spain

Received 29 December 1997 / Accepted 4 February 1998


We present near-IR imaging and spectroscopy, together with sub-mm/mm photometry and 12 CO molecular line maps of the cometary nebula PP 13S. Previous models have been unable to resolve whether PP 13S is a young, pre-main sequence star or an old, evolved object. Our new observations prove conclusively that PP 13S is a young stellar object with a luminosity of [FORMULA] 30 [FORMULA] and an accretion disk with an inclination of [FORMULA] 40o. It has a 12 CO J=2-1 outflow, strong and broadened CO overtone band absorption, and vibrationally excited H2 emission. We conclude that PP 13S has all the characteristics of an FU Orionis-type star, and although no outburst has been observed, we suggest that PP 13S should be added to the list of FUor pre-main sequence stars. Our study also includes PP13N, which we resolve into a young double star system.

Key words: ISM: individual objects: PP 13S – ISM: jets and outflows – stars: pre-main sequence – infrared: ISM: lines and bands – radio continuum: ISM – radio lines: ISM

Send offprint requests to: Göran Sandell

© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998