Computer Science
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aan...361....1t&link_type=abstract
AAVSO Alert Notice 361
Computer Science
Sdss J091945.11+085710.0, Cataclysmic Variable, Hst, Pulsating White Dwarf, Aavso International Database
Scientific paper
Dr. Paula Szkody (University of Washington) has requested our help in monitoring the cataclysmic variable SDSS091908 (SDSS J091945.11+085710.0) for Hubble Space Telescope observations scheduled for the afternoon of November 14 UT. SDSS091908 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=18.3. 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 9:46 UT on November 14, and will also be used in the analysis of the resulting data. Observers should monitor this object nightly beginning now through November 17, and intensively on November 14 UT. In the event of an outburst, please contact the AAVSO immediately. As this object is currently a morning object and confirming observations must be received before 9:30 UT, observers in Europe, Asia, and Oceania are strongly encouraged to participate in this campaign. 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 14.536V comparison star, even if you cannot reach 18.3V in reasonable time. Please submit observations to the AAVSO International Database using the name SDSS091908.
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