IRAS 21391 + 5802 - A study in intermediate mass star formation

Details IRAS 21391 + 5802 - A study in intermediate mass star formation IRAS 21391 + 5802 - A study in intermediate mass star formation

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..250w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 1, p. 250-259.

Astronomy and Astrophysics

Astronomy

17

Cosmic Dust, Early Stars, Infrared Astronomy Satellite, Interstellar Gas, Star Formation Rate, Stellar Evolution, Carbon Isotopes, Carbon Monoxide, Infrared Astronomy, Millimeter Waves, Spectral Energy Distribution

Scientific paper

We present infrared and millimeter wavelength observations of the cold IRAS source 21391 + 5802 and its associated molecular core. Infrared observations at lambda = 3.5 microns reveal a heavily obscured, central point source which is coincident with a compact lambda = 2.7 mm continuum and C18O emission region. The source radiates about 310 solar luminosities, primarily at FIR wavelengths, suggesting that it is a young stellar object of intermediate mass. The steeply rising spectral energy distribution and the large fraction of the system mass residing in circumstellar material imply that IRAS 21391 + 5802 is in an early stage of evolution. The inferred dust temperature indicates a temperature gradient in the core. A comprehensive model for the surrounding core of dust and gas is devised to match the observed dust continuum emission and multitransition CS emission from this and previous studies. We find a r exp -1.5 +/- 0.2 density gradient consistent with that of a gravitationally evolved core and a total core mass of 380 solar masses. The observed dust emission is most consistent with a lambda exp -1.5 - lambda exp -2 dust emissivity law; for a lambda exp -2 law, the data are best fit by a mass opacity coefficient of 3.6 x 10 exp -3 sq cm/g at lambda = 1.25 mm.

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