Formation of low-mass stars in the S68/Serpens-object molecular cloud - Observations of NH3, H2CO and H2O and the 24.5 GHz continuum

Details Formation of low-mass stars in the S68/Serpens-object molecular cloud - Observations of NH3, H2CO and H2O and the 24.5 GHz continuum Formation of low-mass stars in the S68/Serpens-object molecular cloud - Observations of NH3, H2CO and H2O and the 24.5 GHz continuum

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..177u&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 2, Feb. 1984, p. 177-185.

Astronomy and Astrophysics

Astrophysics

35

Hydrogen Clouds, Molecular Clouds, Stellar Evolution, Ammonia, Astronomical Maps, Brightness Temperature, Formaldehyde, Mass Flow, Microwave Emission, Molecular Spectra, Nebulae, Stellar Mass, Stellar Winds, Water Vapor

Scientific paper

The cloud surrounding the Serpens-object was observed in cm lines of ammonia, formaldehyde and water vapor, as well as in the radio continuum at 24.5 GHz. The derived gas temperatures are in the range 12K to 18K and the density is n(H2) = (1 - 2)×104 cm-3. No H2O maser emission was seen during two observing sessions. At least one of the embedded continuum sources has a spectral index >0.65, which is characteristic for ionized gas associated with mass outflows. All observed properties of this cloud are typical for regions in which only stars of low mass (<3 M_sun;) and luminosity (<50 - 100 L_sun;) are presently forming.

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