The Taiwanese-American Occultation Survey Project Stellar Variability. II. Detection of 15 Variable Stars

Creators: Mondal, S.; Lin, C. C.; Chen, W. P.; Zhang, Z.-W.; Alcock, C.; Axelrod, T.; Bianco, F. B.; Byun, Y.-I.; Coehlo, N. K.; Cook, K. H.; Dave, R.; Kim, D.-W.; King, S.-K.; Lee, T.; Lehner, M. J.; Lin, H.-C.; Marshall, S. L.; Protopapas, P.; Rice, J. A.; Schwamb, M. E.; Wang, J.-H.; Wang, S.-Y.; Wen, C.-Y.

Abstract

The Taiwanese-American Occultation Survey (TAOS) project has collected more than a billion photometric measurements since 2005 January. These sky survey data—covering timescales from a fraction of a second to a few hundred days—are a useful source to study stellar variability. A total of 167 star fields, mostly along the ecliptic plane, have been selected for photometric monitoring with the TAOS telescopes. This paper presents our initial analysis of a search for periodic variable stars from the time-series TAOS data on one particular TAOS field, No. 151 (R.A. = 17^(h)30^(m)6^(s).7, decl. = 27°17'30", J2000), which had been observed over 47 epochs in 2005. A total of 81 candidate variables are identified in the 3 deg^2 field, with magnitudes in the range 8 < R < 16. On the basis of the periodicity and shape of the light curves, 29 variables, 15 of which were previously unknown, are classified as RR Lyrae, Cepheid, δ Scuti, SX Phonencis, semi-regular, and eclipsing binaries.

Additional Information

© 2010 American Astronomical Society. Received 2009 September 22; accepted 2010 March 8; published 2010 April 8. The work at National Central University was supported by the grant NSC 96-2112-M-008-024-MY3. Y.I.B. acknowledges the support of the National Research Foundation of Korea through grant 2009-0075376. Work at Academia Sinica was supported in part by the thematic research program AS-88-TP-A02. Work at the Harvard College Observatory was supported in part by the National Science Foundation under grant AST-0501681 and by NASA under grant NNG04G113G. S.L.M.'s work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory in part under Contract W-7405-Eng-48 and by Stanford Linear Accelerator Center under Contract DE-AC02-76SF00515. K.H.C.'s work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory in part under ContractW-7405-Eng-48 and in part under Contract DEAC52-07NA27344.

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