Statistics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..393..113m&link_type=abstract
The seventh astrophysical conference: Star formation, near and far. AIP Conference Proceedings, Volume 393, pp. 113-116 (1997).
Statistics
1
Pre-Main Sequence Objects, Young Stellar Objects And Protostars, Radio, Microwave, Star Formation
Scientific paper
We observed 49 nearby low mass pre-main-sequence stars in the H2CO 212-111, CS 2-1 (both optically thick) and N2H+ 1-0 (optically thin) mm-wavelength lines using the IRAM 30-m, SEST 15-m, and Haystack 37-m radio telescopes. The sources were selected from their spectral energy distributions (Tbol<200 K) and distance (d<400 pc). We find an overabundance of sources whose optically thick lines have blue-shifted asymmetry. We quantify the observed line asymmetries by measuring the difference in the peak velocities of the optically thick and optically thin lines. The observed distribution of velocity differences is skewed toward negative values of Vthick-Vthin velocities. This excess is statistically more significant toward the subsample of the class 0 sources (Tbol<70 K). This can be most naturally explained if low Tbol sources tend to have inward motions. Kinematics of bipolar outflows or rotation can't reproduce the statistics if the source sample has randomly oriented symmetry axes. The statistical results are insensitive to variations in pointing, and are indistinguishable for the CS and H2CO line profiles.
Bachiller Rafael
Garay Guido
Mardones Diego
Myers Phil C.
Tafalla Mario
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