Photometry and astrometry of SS Leo Minoris during the 2006 October superoutburst

Details Photometry and astrometry of SS Leo Minoris during the 2006 October superoutburst Photometry and astrometry of SS Leo Minoris during the 2006 October superoutburst

2007-07-15

arxiv.org/abs/0707.2206v1

Astronomy and Astrophysics

Astrophysics

15 pages, 9 figures. Accepted for publication in the Journal of the British Astronomical Association

Scientific paper

We report unfiltered CCD observations of the first confirmed superoutburst of the SU UMa-type dwarf nova SS LMi in October 2006. From a quiescent magnitude of around 21.7 it rose to 16.2, an outburst amplitude of about 5.5 magnitudes. It declined at 0.17 mag/d for 5 days before slowing to 0.11 mag/d for a further 3 days. The light curve revealed common superhumps with a peak-to-peak amplitude of 0.3 magnitude, which decayed and then re-grew concurrently with the change in decline rate. These were followed by a phase-changing transition to late superhumps. Analysis of these observations has revealed evidence for an orbital period of 0.05572(19) d and a common superhump period of 0.05664(2) d, giving a fractional superhump period excess of 0.017(5). From astrometry of SS LMi in outburst we have established for the first time its correct position as RA 10h 34m 05.85(1)s, Dec +31deg 08m 00.00(18)s (J2000). The position commonly given for SS LMi is that of a nearby star.

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