Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.5001w&link_type=abstract
American Astronomical Society Meeting 208, #50.01; Bulletin of the American Astronomical Society, Vol. 38, p.129
Other
Scientific paper
The large field of view (1.2 degrees), high sensitivity at ultraviolet wavelengths of 1350-2800 Å (AB magnitude about 23 in 1500 s exposure), and repeated sky coverage of the Galaxy Evolution Explorer (GALEX) satellite have resulted in many serendipitous detections of variable and transient ultraviolet sources. 84 of these sources, detected during the first 12 months of the mission, have been reported in version 1.0 of the GALEX Ultraviolet Variability (GUVV) catalog by Welsh et al. (2005). Since then, new software detection tools based on aperture curves of growth, relative photometry and statistical tests have been developed that are now able to reveal many new and lower amplitude time-variable UV sources contained within the ever-expanding GALEX data archives. Here, we report on the preliminary results of implementing these variability detection tools on new data obtained with extended GALEX observations of two regions of the Hyades cluster. The cluster is known to contain many late-type M-dwarf stars that can produce highly energetic UV flares, typically of 200-1000s duration. We also report on the detection of a wide variety of other variable sources which include Seyfert Galaxies, QSOs, field flare stars and many new RR Lyrae stars, which can vary by up to 6 magnitudes in the far ultraviolet (1350-1800 Å) during their pulsation cycle. We anticipate that the RR Lyrae variables will be the predominant type of UV variable source contained in version 2.0 of the GUVV catalog.
Browne Stanley E.
Seibert Marvin M.
Welsh Barry Y.
Wheatley Jonathan
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