The YSOVAR (Young Stellar Object VARiability) Spitzer Space Telescope observing program obtained the first extensive mid-infrared (IRAC 3.6 and 4.5 micron) time series photometry of the Orion Nebula Cluster plus smaller fields in 11 other star-forming cores (AFGL 490, NGC 1333, Mon R2, GGD 12-15, NGC 2264, L1688, Serpens Main, Serpens South, IRAS 20050+2720, IC 1396A, and Ceph C). There are ~29,000 unique objects with light curves in either or both IRAC channels in the YSOVAR data set. YSOVAR is a sister project to the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264; Cody et al. 2014). Initial YSOVAR results were described in Morales-Calderon et al. (2011). Rebull et al. (2014) describes the details of target selection, data reduction, and other conventions established for this project.

The first delivery (October 2015) from YSOVAR includes data from the four clusters that have been published:

• NGC 1333 (Rebull et al. 2015)
• GGD 12-15 (Wolk et al. 2015)
• L1688 (Guenther et al 2014)
• IRAS 20050+2720 (Poppenhaeger et al. 2015)

Please see the delivery documentation for more information about what, exactly, is included in this delivery for these four clusters.

YSOVAR data can be accessed in several ways:

• Search catalogs:
• The Object Table is a list of objects in a given field, and provides multi-wavelength photometry and other reference information.
• The Light Curves Table provides light curves for objects in a given field.
• Browse light curves: NGC1333, GGD 12-15, L1688, IRAS 20050+2720.
• Download the catalogs (3.1 MB).

Images from the YSOVAR program can be obtained from the Spitzer Heritage Archive by searching for Programs 60014, 61020, 61021, 61022, 61023, 61024, 61025, 61026, 61027, 61028, 61029, 61030.

Access all the Spitzer Legacy/Exploration Science datasets at IRSA.