A pipeline for the ROTSE–IIId archival data

Abstract

We have constructed a new, fast, robust and reliable pipeline to detect variable stars from the ROTSE-IIId archival data. Turkish share of ROTSE-III archive contains approximately one million objects from a large field of view (1.85 • ) and it considerably covers a large portion of northern sky (δ > −25 • ). The unfiltered ROTSE-III magnitude of the objects ranges from 7.7 to 16.9. The main stages of the new pipeline are as follows: Source extraction, astrometry of the objects, light curve generation and inhomogeneous ensemble photometry. A high performance computing (HPC) algorithm has also been implemented into the pipeline where we had a good performance even on a personal computer. Running the algorithms of the pipeline on a cluster decreases analysis time significantly from weeks to hours. The pipeline is especially tested against long period variable stars with periods of a few hundred days (e.g Mira and SR) and variables having periods starting from a few days to a few hundred days were detected.

A Study on W Ursae Majoris-Type Systems Recognised by the ROTSE-IIId Experiment

“…The outcome from the above analysis was a total of 118 light curves of well-known W UMa stars, of which 45 candidates had enough number of data points in their light curves for any period analysis in detail. Two of the systems, Cl* NGC 6791 KR V118 and V791 Cep were also excluded since they were 17.68 and 17.27 mag, respectively, which are ~1.0 mag fainter than the limiting magnitude of ROTSE-IIId (Güçsav et al 2012). Times of all systems used in this study were corrected to the Solar System barycenter.…”