Details

Autor(en) / Beteiligte

• Bieging, John H.
• Peters, William L.
• Schlottman, Keith
• Kulesa, Craig
• Vila Vilaro, Baltasar

Titel

SEQUENTIAL STAR FORMATION IN THE Sh 254-258 MOLECULAR CLOUD: HEINRICH HERTZ TELESCOPE MAPS OF CO J = 2-1 AND 3-2 EMISSION

Ist Teil von

• The Astronomical journal, 2009-09, Vol.138 (3)

Ort / Verlag

United States

Erscheinungsjahr

2009

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 {sup 13}CO molecules over 0.{sup 0}75 x 1{sup 0}, 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.