A study of the stellar population in the LYNDS 1641 dark cloud - Deep near-infrared imaging

Astronomy and Astrophysics – Astronomy

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Infrared Imagery, Near Infrared Radiation, Pre-Main Sequence Stars, Star Formation, Stellar Winds, Astronomical Photometry, Frequency Distribution, Infrared Astronomy Satellite, Interstellar Extinction

Scientific paper

Deep H and K photometry of a selection of IRAS point sources in the L1641 cloud is presented. Using these data in combination with IRAS data and previously published near-infrared photometry for sources in this region, it is found that the L1641 cloud contains newly born stars embedded within cores of unusually large visual extinction. A comparison of the properties of cores in L1641 with those in the Taurus-Auriga star-forming complex reveals that L1641 contains cores with higher visual extinctions, larger ammonia (J, K) = (1, 1) line widths, greater kinetic temperatures, and probably higher optical depths at 100 microns than any cores in Taurus-Auriga. These results are qualitatively consistent with recent suggestions that the process of protostellar collapse in cores in the L1641 cloud is dominated by gravity while this process is dominated by magnetic fields in Taurus-Auriga.

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