Dense Shell around a Young Intermediate-Mass Star: NGC 2264 IRS1

Details Dense Shell around a Young Intermediate-Mass Star: NGC 2264 IRS1 Dense Shell around a Young Intermediate-Mass Star: NGC 2264 IRS1

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55....1n&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.1, pp.1-9

Astronomy and Astrophysics

Astronomy

11

Galaxy: Open Clusters And Associations: Individual (Ngc 2264), Ism: Clouds, Ism: Molecules, Stars: Formation, Stars: Pre-Main-Sequence

Scientific paper

The results of H13CO+ J = 1 -- 0 line and 93-GHz continuum observations of NGC 2264 IRS1, a luminous infrared source known as Allen's source, are reported. IRS1 is a young intermediate-mass star with a surrounding YSO cluster, and is associated with a molecular outflow. High angular resolution interferometric observations were performed using the Nobeyama Millimeter Array, and mapping observations were conducted using a 45-m telescope. The continuum map reveals four sources, three of which correspond to a submillimeter source detected by Ward-Thompson et al. (2000, AAA 73.137.062). Four compact clumps are also observed in the H13CO+ map, two of which are associated with these millimeter/submillimeter continuum sources without bipolar outflow. These H13CO+ clumps as a whole form an incomplete dense shell of 0.12pc in diameter around IRS1, and the outer part of the shell is clearly traced on t he single-dish map. The shell, or cavity, structure suggests that the outflow from IRS1 has evacuated part of the surrounding envelope in ˜ 0.1Myr. The kinematic properties can be interpreted as being two clumps of entrained or compressed material derived from steady outflow. It is concluded that the activity of IRS1 may have triggered the formation of cluster members in the dense surrounding shell.

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