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

Astronomy and Astrophysics – Astrophysics

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Ism: Individual Objects: Pp 13S, Ism: Jets And Outflows, Stars: Pre-Main Sequence, Infrared: Ism: Lines And Bands, Radio Continuum: Ism, Radio Lines: Ism

Scientific paper

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 ~ 30Lsun and an accretion disk with an inclination of ~ 40°. It has a {(12) CO} J=2-1 outflow, strong and broadened CO overtone band absorption, and vibrationally excited H_2 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.

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