Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cha%26a..31..387z&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 31, Issue 4, p. 387-399.
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
Using the 13.7 m millimeter-wave telescope at the Qinghai Station of Purple Mountain Observatory, we have made observations of 13CO, C18O, HCO+ and N2H+ molecular lines towards IRAS 02232+6138. As the excitation density of the probe molecule increases from 13CO to HCO+, the size of the cloud core associated with IRAS 02232+6138 decreases from 2.40 pc to 0.54 pc, and the virial mass of the cloud core decreases from 2.2 × 103M&sun; to 5.1 × 102M&sun;. A bipolar molecular outflow is found towards IRAS 02232+6138. Using the power function n(r) ∝ r-α to fit the spatial density structure of the cloud core, we obtain the power-law index α = 2.3 - 1.2; and we find that, as the probed density increases, the power function becomes more flat. The abundance ratio of 13CO to C18O is 12.4 ± 6.9, comparable with the values 11.8 ± 5.9 for dark clouds and the values 9.0 15.6 for massive cores. The abundance of N2H+ molecules is 3.5 ± 2.5 × 10-10, consistent with the value 1.0 - 5.0 × 10-10 for dark cloud cores and the value 1.2 - 12.8 × 10-10 for massive cores. The abundance of HCO+ molecules is 0.9 ± 0.5 × 10-9, close to the value 1.6 - 2.4 × 10-9 for massive cores. An increase of HCO+ abundance in the outflow region was not found. Combining with the IRAS data, the luminosity-mass ratio of the cloud core is obtained in the range 37 163(L/M)&sun;. Based on the IRAS luminosity, it is estimated that a main-sequence O7.5 star is probably embedded in the IRAS 02232+6138 cloud core.
Wang Min
Yang Ji
Zhu Liu-Bin
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