Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341315m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #413.15; Bulletin of the American Astronomical Society, Vol. 41, p.222
Astronomy and Astrophysics
Astronomy
Scientific paper
Giant molecular clouds (GMCs) provide an excellent environment for studying star formation, one of the most fundamental evolutionary paths in astronomy. The Orion Giant Molecular Cloud complex as our nearest GMC has consequently become a region of interest in the field. Recent sky surveys in the infrared have provided more photometry than previously available for the region, opening the door to more exploration of and precise science with the cloud. In this report we focus on a region in the south of the Orion GMC, Lynds 1641 (L1641). Data from the Two Micron All Sky Survey (2MASS) and the Spitzer Space telescope are used to classify 802 stars in this region and place them in HR diagrams by region and young stellar object (YSO) class. Using models for stellar evolution to estimate age and mass, we take a look at trends present between YSO class and age, age and location in L1641, as well as accretion properties of these young stellar objects. We find that YSO class follows a clear age sequence as previously observed. We estimate the age of the southern region of L1641 as the oldest, and the age of the northern region as the youngest, though there is some contamination from an older group of foreground stars. We also supply evidence that accretion becomes weaker with age.
This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.
Allen Laura E.
Covey Kevin
Mosby Gregory
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