Deep Near Infrared Survey of Nearby Star-Forming Regions -- Luminosity Function of Very Low-Mass YSOs --

Details Deep Near Infrared Survey of Nearby Star-Forming Regions -- Luminosity Function of Very Low-Mass YSOs -- Deep Near Infrared Survey of Nearby Star-Forming Regions -- Luminosity Function of Very Low-Mass YSOs --

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..343o&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Computer Science

Scientific paper

We have performed deep near-infrared (NIR) surveys searching for very low-mass young stellar objects (YSOs) in the nearby star-forming regions of Chamaeleon and Taurus. The observations are complete to K = 16.2 mag with 10 σ photometric accuracy, sufficiently sensitive to provide a census of the embedded very low-mass stellar population in the molecular clouds. Based on NIR color-color diagrams, we discriminate embedded YSO candidates with NIR excesses from reddened field stars in each region. There exist a significant population of the extremely low-luminosity YSO candidates that are >= 7 mag fainter than typical T Tauri stars in the same cloud, implying very low-mass. Along with the latest theoretical evolutionary models, we suggest that these extremely low-luminosity YSO candidates could be young brown dwarfs. The J-band luminosity function in each region, which is important for establishing initial mass function, does not have any turnover down to its low-luminosity end. In the Chamaeleon I core, stars form in a clustered mode characterized by both a high star formation efficiency and high stellar density like as in the ρ Oph core, while stars in the Taurus molecular cloud are formed in isolated-mode.

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