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Published August 2017 | Supplemental Material + Published
Journal Article Open

The Catalina Surveys Southern periodic variable star catalogue


Here, we present the results from our analysis of 6 yr of optical photometry taken by the Siding Spring Survey (SSS). This completes a search for periodic variable stars within the 30 000 deg^2 of the sky covered by the Catalina Surveys. The current analysis covers 81 million sources with declinations between −20° and −75° with median magnitudes in the range 11 < V < 19.5. We find approximately 34 000 new periodic variable stars in addition to the ∼9000 RR Lyrae that we previously discovered in SSS data. This brings the total number of periodic variables identified in Catalina data to ∼110 000. The new SSS periodic variable stars mainly consist of eclipsing binaries, RR Lyrae, LPVs, RS CVn stars, δ Scutis, and Anomalous Cepheids. By cross-matching these variable stars with those from prior surveys, we find that ∼90 per cent of the sources are new discoveries and recover ∼95 per cent of the known periodic variables in the survey region. For the known sources, we find excellent agreement between our catalogue and prior values of luminosity, period, and amplitude. However, we find many variable stars that had previously been misclassified. Examining the distribution of RR Lyrae, we find a population associated with the Large Magellanic Cloud (LMC) that extends more than 20° from its centre confirming recent evidence for the existence of a very extended stellar halo in the LMC. By combining SSS photometry with Dark Energy Survey data, we identify additional LMC halo RR Lyrae, thus confirming the significance of the population.

Additional Information

© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 May 2. Received 2017 April 27; in original form 2017 February 27. Published: 06 May 2017. CRTS and CSDR1 are supported by the U.S. National Science Foundation under grants AST-1313422 and AST-1413600. The CSS survey is funded by the National Aeronautics and Space Administration under grant no. NNG05GF22G issued through the Science Mission Directorate Near-Earth Objects Observations Programme. AJD, MC, GT, VB, and SEK acknowledge partial support by CONICYT's PCI program through grant DPI20140066. MC is additionally supported by the Ministry for the Economy, Development, and Tourism's Iniciativa Científica Milenio through grant IC 120009, awarded to the Millennium Institute of Astrophysics; by Proyecto Fondecyt Regular no. 1141141; and by Proyecto Basal PFB-06/2007. This research has made use of the International VSX data base, operated at AAVSO, Cambridge, Massachusetts, USA, and the SIMBAD data base, operated at CDS, Strasbourg, France. AllWISE makes use of data from WISE, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, and NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology. WISE and NEOWISE are funded by the National Aeronautics and Space Administration.

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August 22, 2023
October 17, 2023