Observations toward IRAS 02232+6138 with 13CO, C18O, HCO+ and N2H+

Details Observations toward IRAS 02232+6138 with 13CO, C18O, HCO+ and N2H+ Observations toward IRAS 02232+6138 with 13CO, C18O, HCO+ and N2H+

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007acasn..48..153z&link_type=abstract

Acta Astronomica Sinica, vol. 48, no. 2, p. 153-164

Astronomy and Astrophysics

Astronomy

Stars: Formation, Ism: Molecules, Ism: Abundances, Ism: Structure, Ism: Evolution

Scientific paper

Using the Delingha 13.7m millimeter-wave telescope, we observed 13CO, C18O, HCO+ and N2H+ molecular lines toward IRAS~02232+6138. With the increase of excitation densities from to N2H+, the sizes of corresponding dense cores associated 32+6138 vary from 2.40 to 0.54pc and virial masses decrease from 2.2×10^3 to 5.1×10^2Msun A bipolar molecular outflow is found toward IRAS02232+6138. Using a power-law function of n(r)? r-? to fit the spatial density structure of the core, we derived power-law indices α= 2.3-1.2. As critical densities increase from 13CO to N2H+, the power-law function becomes flat gradually. The abundance ratio of 13CO/C18O is 12.4±6.9, which is comparable with the ratio of 11.8±5.9 for dark clouds and 9.0-15.6 for massive cores. The abundance of N2 H+ is 3.5±2.5×10-10, which is consistent with the value of 1.0-5.0×10-10 for dense cores in dark clouds and 1.2-12.8×10-10 for massive cores. The abundance of HCO+ is 0.9±0.5×10-9, close to the value of 1.6-2.4×10-9 for massive dense cores. No evidence for HCO+ enhancement has been observed for this source. In aid of the IRAS data, the luminosity-to-mass ratio of the core was calculated to be in the range of 37-163(L/M)?. Based on the IRAS luminosity, a young stellar object of spectral type O7.5 has been formed in the IRAS 02232+6138 core.

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