Mid-Infrared Variability of Orion Protostars using Spitzer

Details Mid-Infrared Variability of Orion Protostars using Spitzer Mid-Infrared Variability of Orion Protostars using Spitzer

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734021m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #340.21; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present initial results for Class I protostars in Orion based on synoptic data from the YSO variability (YSOVAR) program. The Spitzer data represent 81 epochs spanning 40 days at 3.6 and 4.5 microns wavelength in the Orion star-forming region. The mid-infrared data are sensitive to the inner regions of disks and thus provide information on inner disk structure and variable accretion rates. The typical magnitude variation is 0.3 mag, small enough to suggest that hot spot plus disk models developed for class II sources may also apply to protostars. However about 10 percent of Orion protostars show variations greater than 0.6 magnitudes. We discuss several models that can produce large magnitude variations in protostars.

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