Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743409v&link_type=abstract
American Astronomical Society, AAS Meeting #217, #434.09; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
In April of 2007, the dwarf nova GW Librae erupted for a second time. We report the results of the worldwide observing campaign of this outburst. Our data consists of 90 nights of time-series photometry obtained from several locations around the Earth.
GW Lib first erupted in 1983. Since then and until the 2007 eruption, GW Lib was quiescent at magnitude 16.6. During the 2007 eruption, the light rose sharply from V=13 to maximum light at V=8.3 in one day. The main eruption lasted 26 days, and was characterized by a roughly constant phase (the so-called "plateau phase") followed by a sudden drop to magnitude 15. The light then dimmed slowly toward quiescence.
GW Lib is a dwarf nova of short orbital period (77 minutes). During the eruption, the star showed the expected powerful superhumps in its light curve at a period slightly longer than the orbital period. A fractional period excess of 1.3% suggests a secondary star mass near 0.06 M&sun;. These superhumps took 10 days to appear and lasted for at least 90 days after the peak of the eruption. This time frame agrees with the general idea that cataclysmic variables of short orbital period are actually quite old with small secondary stars that have been whittled away by mass transfer over eons of evolution. Analysis of accretion light during the outburst suggests Lbol=8(±2) × 1931 ergs/s and Mdot=1.3(±0.3) × 10-11 M&sun;/year.
Patterson Jaclyn
Vican Laura
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