IRAS studies of galactic supershells

Details IRAS studies of galactic supershells IRAS studies of galactic supershells

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..145s&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 145-146 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

Astronomical Catalogs, Cygnus Constellation, Infrared Astronomy Satellite, Star Clusters, Star Formation, B Stars, Main Sequence Stars, Massive Stars, O Stars, Stellar Mass, Wolf-Rayet Stars

Scientific paper

Using IRAS Skyflux images and a new catalog of OB stars in the Cygnus region, a complete infrared supershell surrounding the Cyg OB1 Association was identified. This supershell is seen as a conspicuous, well-defined 2 deg x 5 deg region deficient of IR emission, with a limb-brightened edge and dimensions of about 50 x 130 pc at 1.5 kpc. The shell's elongated morphology is consistent with OB-star subclustering over the approximately 10(exp 6) yr age of the bubble. With a parent star cluster still visible (10 O stars between 25 and 45 solar mass, 3 - 4 Wolf-Rayet stars, and the possibility of 3 - 5 more massive stars that died as supernovae) the Cyg OB1 supershell is an excellent object for studying the formation and evolution of Galactic supershells. A discrepancy between the less than or equal to 1 Myr bubble age estimated from its size and the 5 Myr cluster turnoff age (45 solar mass) may require non-coeval massive star formation to explain the number of post-main-sequence stars and limit the number of past supernovae.

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