Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9104y&link_type=abstract
HST Proposal ID #9104
Computer Science
Hst Proposal Id #9104 Star Formation
Scientific paper
The Trifid nebula {M20} is a well-known prominent optical HII region trisected by bands of obscuring dust lanes and excited by an O7.5 star HD 164492A. Our recent study of near-IR ground-based observations of this region at J, H, K and L show all seven components of HD 164492 {A to G} identified optically. Our sub-arcsecond radio continuum VLA and ground- based observations of M20 also show free-free emission from three stellar sources {B, C and D} and a bright rim outlining a protostellar condensation {TC1} lying close to the O7V star {HD 164492A} at the center of the nebula. Based on a number of strong arguments, these stars have disks associated with them and their envelopes are photoionized externally by the UV radiation from the hot central star, HD 164492A. The proposed WFPC2 observations are intended to search for neutral protoplanetary disks ``proplyds'', to study the optically bright rim of ionized gas associated with TC1 for signs of star formation, and to make a detailed subarcsecond determination of extinction toward the dust lanes of M20 using HAlpha and 6cm data.
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