Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1182a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1182-1198. Research supported by Pennsylvania State University.
Astronomy and Astrophysics
Astronomy
80
Early Stars, Ophiuchi Clouds, Pre-Main Sequence Stars, Radio Sources (Astronomy), Sky Surveys (Astronomy), Star Formation, Stellar Flares, Stellar Spectra, Variable Stars
Scientific paper
An extensive radio-continuum survey of the ρ Ophiuchi molecular cloud was conducted with the Very Large Array to look for counterparts of several dozen pre-main-sequence stars found in X-ray, optical, and infrared surveys. Four square degrees were mapped at 1.4 GHz, with a sensitivity of 1.5 - 3 mJy; in addition, the central part of the cloud was mapped at 5 GHz with a sensitivity of 1 mJy. The authors detect 93 radio sources, significantly more than in previous observations. Thirteen radio sources are found to be probably stellar. They include five variable X-ray stars, seven near- or far-infrared sources, five stars visible on the Palomar Sky Survey, and ten sources with flat or ascending radio spectra. No optical T Tauri star is detected. The remaining sources are extragalactic, in agreement with radio-source counts. The stellar radio sources in the cloud constitute a population distinct from T Tauri stars, and they tend to have unusual infrared energy distributions. The authors suggest that they correspond to somewhat evolved young stars born in the cloud.
Andre' Philippe
Feigelson Eric D.
Montmerle Thierry
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