Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734010s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #340.10; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astrophysics
Scientific paper
There is growing consensus that low-mass star formation is characterized by variable accretion rates. Our analysis of IC 5146 shows that as much as 27% of the young stellar objects (YSOs) exhibited mid-infrared variability, with 10-60% changes in flux density, between two epochs of Spitzer observations separated by 2.5 years. We perform a similar analysis of YSOs in other clouds observed by the Cores-to-Disks and Gould's Belt Spitzer Legacy teams, including selected regions in Perseus and Serpens. By extending this analysis to other regions, we can characterize the magnitude and frequency of mid-infrared variability of YSOs in different evolutionary stages and environments. With this increased YSO sample and the broad spectral range offered by the archived Spitzer cryogenic mission, we may better constrain whether such variability is dominated by evolution of the protostellar disk or luminosity changes in the central source, both presumably caused by variable accretion. This analysis is funded by a grant from the NASA Astrophysics Data Analysis program.
Cieza Lucas. A.
Huard Tracy L.
Mundy Lee G.
Storm Shaye
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