Mid-Infrared Variability of Protostars and YSOs in Nearby Dense Cores

Details Mid-Infrared Variability of Protostars and YSOs in Nearby Dense Cores Mid-Infrared Variability of Protostars and YSOs in Nearby Dense Cores

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536907h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #369.07; Bulletin of the American Astronomical Society, Vol. 42, p.560

Astronomy and Astrophysics

Astrophysics

Scientific paper

Before the launch of the Spitzer Space Telescope, a systematic study to identify and characterize mid-infrared variability in young sources was not feasible. Within the last five years, however, the Cores-to-Disks Spitzer Legacy team has observed and identified protostars and young stellar objects (YSOs) in a large sample of nearby, isolated dense cores. Multiple epochs of mid-infrared observations exist for some of these cores and are publicly available in the Spitzer archive. Analysis of the fluxes of protostars and YSOs at different epochs demonstrates that some of these sources exhibit mid-infrared variability. For example, preliminary results show that of 68 candidate protostars and YSOs with two epochs separated by 1-1.5 years, 16 exhibit significant (3-sigma) variability with at least a 10% change in flux, 7 of which show a 20% change in flux. Such mid-infrared variability suggests that the earliest stages of star formation, like the later stages, may be marked by non-steady mass accretion. We will present the results of a more detailed investigation, which includes an analysis of the relative changes in mid-infrared fluxes in the different Spitzer bands. Specific examples of variability will be highlighted. Finally, we will compare the plausibility of variable clumpiness of material along the lines of sight with an alternative explanation of non-steady mass accretion. This analysis is funded by a grant from the NASA Astrophysics Data Analysis program.

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