Computer Science
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aan...366....1t&link_type=abstract
AAVSO Alert Notice 366
Computer Science
Sdss J133941.11+484727.5, Cataclysmic Variable, Hst, Pulsating White Dwarf, Aavso International Database
Scientific paper
Dr. Paula Szkody (University of Washington) and collaborators have requested our help in monitoring the cataclysmic variable SDSS133948 (SDSS J133941.11+484727.5) for Hubble Space Telescope observations scheduled for the afternoon of January 24, 21:30 UT, through approximately January 25, 15:15 UT. SDSS133849 has not previously been seen in outburst, and is being observed as part of a larger study of pulsating white dwarf primaries in cataclysmic variables. In particular, Szkody and collaborators are investigating the effects that higher temperatures and larger rotation velocities caused by accretion have on the pulsation behavior. This object is very faint at quiescence, with V=17.7. AAVSO observations are requested to ensure that the object is indeed faint when observed with HST, as it could damage the instrument if it were to go into outburst. AAVSO observations will be used to make a "go"/"no go" decision at 21:41 UT on January 24, and will also be used in the analysis of the resulting data. Observers should monitor this object nightly beginning now through January 31, and intensively on January 24-25 UT. In the event of an outburst, please contact the AAVSO immediately. CCD observers are asked to use filters if possible, preferably V, but B, Rc, and Ic may also be used. Please use sufficient exposure (with S/N = 10) to reach at least the 15.045V comparison star, even if you cannot reach 17.7V in reasonable time. Please submit observations to the AAVSO International Database using the name SDSS133848.
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