The GALEX ultraviolet variability catalog

Barry Y. Welsh, Jonathan M. Wheatley, Kenneth Heafield, Mark Seibert, Stanley E. Browne, Samir Salim, R. Michael Rich, Tom A. Barlow, Luciana Bianchi, Yong I.K. Byun, Jose Donas, Karl Forster, Peter G. Friedman, Timothy M. Heckman, Patrick N. Jelinsky, Young Wook Lee, Barry F. Madore, Roger F. Malina, D. Christopher Martin, Bruno MilliardPatrick Morrissey, Susan G. Neff, David Schiminovich, Oswald H.W. Siegmund, Todd Small, Alex S. Szalay, Ted K. Wyder

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We present version 1.0 of the NASA Galaxy Evolution Explorer (GALEX) ultraviolet variability (GUVV) catalog, which contains information on 84 time-variable and transient sources gained with simultaneous near-ultraviolet (NUV) and far-ultraviolet (FUV) photometric observations. These time-variable sources were serendipitously revealed in the various 1.°2 diameter star fields currently being surveyed by the GALEX satellite in two ultraviolet bands (NUV 1750-2750 Å, FUV 1350-1750 Å) with limiting AB magnitudes of 23-25. The largest amplitude variable objects currently detected by GALEX are M dwarf flare stars, which can brighten by 5-10 mag in both the NUV and FUV bands during short-duration (<500 s) outbursts. Other types of large-amplitude ultraviolet variable objects include ab-type RR Lyrae stars, which can vary periodically by 2-5 mag in the GALEX FUV band. This first GUVV catalog lists galactic positions and possible source identifications in order to provide the astronomical community with a list of time-variable objects that can now be repeatedly observed at other wavelengths. We expect the total number of time-variable source detections to increase as the GALEX mission progresses, such that later version numbers of the GUVV catalog will contain substantially more variable sources.

Original languageEnglish
Pages (from-to)825-831
Number of pages7
JournalAstronomical Journal
Volume130
Issue number2
DOIs
Publication statusPublished - 2005 Aug

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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