CO Observations and Stability Analysis of B133 and B134

Details CO Observations and Stability Analysis of B133 and B134 CO Observations and Stability Analysis of B133 and B134

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jkas...24...71h&link_type=abstract

Journal of the Korean Astronomical Society, vol. 24, no. 1, p. 71-94

Astronomy and Astrophysics

Astronomy

2

Scientific paper

With the 14m radio telescope at DRAO and the 4m at Nagoya University, we have made detailed maps of 12CO and 13CO emission from two Barnard objects B133 and B134 in the J = 1-0 rotational transition lines. Usual LTE analyses of the CO observations led us to determine the distribution of column densities over an entire area encompassing both globules. Total gas masses estimated from the column density map are 90 Mo and 20Mo for B133 and B134, respectively. The radial velocity of B133 is red shifted with respect to B134 by 0.8 km/s, which is too large to bind the two clouds as a binary system. We have shown that the usual stability analysis based on the simplified version of virial theorem with the second time-derivative of the moment of inertia term I_double dot being ignored could mislead us in determining whether a given cloud eventually collapsed or not. The full version of scalar virial theorem with the I_double dot term is shown to be useful in following up the time-dependent variations of the cloud size R and its streaming velocity R_dot as functions of time. Results of our stability analysis suggest that B133 will eventually collapse in (2~4)*10E6 years.

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