VizieR Online Data Catalog: The CIDA Variability Survey of Orion OB1. II. (Briceno+, 2019)

The CVSO consists of multi-epoch optical quasi-simultaneous V-, R-, and I-band observations across the entire Orion OB1 association, obtained with the 8000x8000 pixel QUEST CCD Mosaic camera (Baltay et al. 2002PASP..114..780B), installed on the 1 m aperture Jurgen Stock Schmidt-type telescope at the National Astronomical Observatory of Venezuela. The system is optimized to operate in drift-scan mode: the telescope remains fixed at a given hour angle and declination, and because of sidereal motion, stars move across the length of each CCD. The CVSO comprises 337 drift scans, listed in Table 1, performed along strips of R.A. centered at declinations -5°, -3°, -1°, +1°, +3°, and +5°. We included observations obtained specifically for our program, but also for other programs that had targeted the same part of the sky with the QUEST camera (e.g., Rengstorf et al. 2004ApJ...606..741R; Vivas et al. 2004, J/AJ/127/1158; Downes et al. 2008AJ....136...51D, 2014, J/MNRAS/444/1793). The 4.7 Tb data set corresponds to ~15000 hr of observations in the V, R, and I filters, obtained over 190 nights between 1999 and 2008. A total of 7796 candidates fainter than V~16 were observed in our combined multi-fiber spectrograph campaigns. Both Hectospec and Hydra have a 1 deg diameter field of view, while Michigan/Magellan Fiber System (M2FS) has a 29.5 arcmin diameter field. Hectospec has 300 fibers, each 1.5" on the sky. Hydra with the Red Channel has 90 fibers, each with a projected diameter of 2.0", and M2FS offers up to 256 fibers, 128 for each of its twin Littrow spectrographs, each fiber with a projected diameter of 1.2" on the sky. In Table 2, we show the full log of all the multi-fiber spectrograph observations for Hydra, Hectospec, and the M2FS. We classified 2062 candidates as confirmed low-mass, PMS stars of K- and M-type, based on our low-resolution spectra (passed Hα, Li I criterion). The properties of each T Tauri star (TTS) are provided in Table 3.

(3 data files).