Cygnus OB2 - Archaeology Of Our Closest Massive Star Factory

Details Cygnus OB2 - Archaeology Of Our Closest Massive Star Factory Cygnus OB2 - Archaeology Of Our Closest Massive Star Factory

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725818v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #258.18; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Cygnus OB2 is the nearest example of a massive star-forming region, at only 1.45kpc.
Despite its status and importance, we still lack a basic understanding of this complex.
Practically all of its 50+ O-type stars and some of its B-type stars have been scoped, but low-mass members remain poorly studied. An extensive set of new spectra collected using the FAST and HectoSpec instruments at the Fred Lawrence Whipple Observatory is allowing for a much more detailed study of the association.
Optical spectra of pre-main sequence objects, vital in developing our global understanding of star formation and the products thereof, are being analyzed in order to characterize masses and velocities of individual objects within the region. The level of reddening of the spectra is first identified, providing a more reliable estimate of spectral type than photometry alone, and from which stellar mass and temperatures are derived. Velocities are then obtained via cross-correlation and line centroiding techniques. Combining these two results will map out the distribution of velocities as a function of stellar mass. The end goal of this study is to understand the dynamics and boundedness of the cluster, and to diagnose the presence of any sub-clustering and mass segregation. In this way, Cygnus OB2 is poised to become a stepping stone with which to extend our detailed understanding of Gould Belt star forming regions down to the lowest mass stars to much more massive clusters and starbursts.

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