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Periodic and Aperiodic Variability in the Molecular Cloud ρ Ophiuchus

Plavchan, Peter; Parks, J. Robert; White, Russel J. +1 more

Presented are the results of a near-IR photometric survey of 1678 stars in the direction of the ρ Ophiuchus (ρ Oph) star forming region using data from the 2MASS Calibration Database. For each target in this sample, up to 1584 individual J-, H-, and K_s -band photometric measurements with a cadence of ~1 day are obtained over three obser…

Observed Relationship between CO 2-1 and Dust Emission during the Post-asymptotic-giant-branch Phase

Szczerba, R.; He, J. H.; Schmidt, M. R. +1 more

A CO 2-1 line survey is performed toward a sample of 58 high Galactic latitude post-asymptotic-giant-branch (pAGB) stars. To complement the observations, a compilation of literature CO 2-1 line data of known pAGB stars is done. After combining the data sets, CO 2-1 line data are available for 133 pAGB stars (about 34% of known pAGB stars) among wh…