Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aan...367....1t&link_type=abstract
AAVSO Alert Notice 367
Physics
U Sco, Recurrent Nova, White Dwarf, Mass Accretion, Aavso International Database
Scientific paper
Dr. Bradley E. Schaefer (Louisiana State University) requests increased monitoring of the recurrent nova U Scorpii over the next 24 months. Observers are asked to add U Sco to their regular observing program and to monitor the star in advance of an outburst predicted to occur around 2009.3 +/- 1.0 year. Schaefer predicts that because the nova outburst occurs after a certain amount of material collects on the white dwarf, and because the quiescent brightness of the star follows the mass accretion rate, we can predict when the accreted mass reaches the nova ignition point. Schaefer requests that "... U Sco should be looked at frequently for the next year or more, starting [now]." Because U Sco is known to have short eruptions it is imperative that the field be observed as often as possible, particularly around the time of solar conjunction when observations are most difficult. Morning observations are therefore most urgently requested at this time. Both visual and photometric observations of U Sco are requested for this long-term campaign. Observations (both positive and fainter-than) should be submitted to the AAVSO International Database as U Sco.
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