Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aan...360....1t&link_type=abstract
AAVSO Alert Notice 360
Physics
U Gem, Ss Cyg, Cataclysmic Variables, Radio Emission, Merlin, Vla, Jodrell Bank, Nrao, Multiwavelength Observations, Aavso International Database
Scientific paper
Dr. Elmar Koerding, University of Southampton, England, and his collaborators have requested our assistance in a continuing project to monitor two dwarf novae - U Geminorum and SS Cygni - in support of radio observations with the Jodrell Bank MERLIN Array and NRAO Very Large Array (VLA) telescopes. This new campaign is a continuation of the project described in AAVSO Alert Notice 345. Koerding and collaborators are attempting to detect and characterize radio emission from dwarf novae during outbursts. Rapid optical detection of an outburst onset will be used to trigger target-of-opportunity (TOO) observations with the MERLIN Array in the UK and with the VLA in New Mexico. Observations of SS Cyg during the first campaign yielded important new results, and a paper on those observations will be submitted for publication in late 2007. Continuous optical monitoring and rapid reporting of observations of U Gem and SS Cyg is requested beginning 2007 November 5 (JD 2454410). This campaign will continue for at least several months, until a total of four outbursts are detected in either of these systems and TOO observations are obtained with the VLA and MERLIN. Rapid reporting of observations is critical to the success of this campaign. Observers are requested to report their observations to the AAVSO International Database within one (1) hour, especially if an object appears to be in transition to outburst. Quiescent (including "fainter-than" (upper-limit) observations) and full outburst observations are also important as they can be used to constrain when an outburst begins and and ends. Both visual and CCD observations are requested, but CCD time-series observations should only be performed if the data can be reduced and submitted immediately if an outburst has not yet been reported. Once an outburst has been detected and acknowledged by the radio observatories, filtered time-series observations will then be very useful. The outburst threshold (the magnitude at which the star is highly likely to go into outburst if it reaches this point) for U Gem is 13.5V and for SS Cyg is 11.0V. Please report any observations equal to or brighter than these values immediately to the AAVSO.
No associations
LandOfFree
Request to Monitor U Gem and SS Cyg for Radio Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Request to Monitor U Gem and SS Cyg for Radio Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Request to Monitor U Gem and SS Cyg for Radio Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1695859