Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apjs..130..437d&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 130, Issue 2, pp. 437-461.
Astronomy and Astrophysics
Astronomy
41
Stars: Circumstellar Matter, Infrared: Stars, Masers, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We present a mid-infrared imaging survey of 21 sites of massive star formation associated with methanol masers. Images were obtained from the Cerro Tololo Inter-American Observatory 4 m Blanco telescope using the University of Florida imager/spectrometer OSCIR. Of the 10 sites where the methanol masers are distributed in a linear fashion, we find three sources that are elongated at the same position angle as their linear methanol maser distributions. It is believed that these elongated mid-infrared objects are indeed circumstellar disks. It was found that the masers may arise inside the mid-infrared emitting regions of these young stellar objects, indicating that the methanol masers may be pumped by mid-infrared photons. Many mid-infrared sources in our survey have no detectable radio continuum emission, and we advance the hypothesis that these sources are lower mass, nonionizing stars.
de Buizer James M.
Pina Robert K.
Telesco Charles M.
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