Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....138..975b&link_type=abstract
The Astronomical Journal, Volume 138, Issue 3, pp. 975-985 (2009).
Astronomy and Astrophysics
Astronomy
6
H Ii Regions, Ism: Clouds, Ism: Molecules, Stars: Formation
Scientific paper
The molecular cloud associated with the Sh 254-258 group of five small H II regions appears to be forming a (late)-OB association. We have mapped the associated molecular cloud in the J = 2-1 line of the CO and 13CO molecules over 0fdg75 × 1°, and the CO J = 3-2 line toward the two main peaks, with the University of Arizona Heinrich Hertz Submillimeter Telescope. The data are analyzed with a statistical equilibrium code to estimate physical properties of the molecular gas. We compare the molecular cloud morphology with images at optical, IR, and radio wavelengths. From this analysis, we propose a scenario for sequential formation of the stars exciting the H II regions, triggered by the compression of the molecular gas as a consequence of the expansion of the adjacent H II regions.
Bieging John H.
Kulesa Craig
Peters William L.
Schlottman Keith
Vila Vilaró Baltasar
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