Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21349108s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #491.08; Bulletin of the American Astronomical Society, Vol. 41, p.468
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present time-resolved CCD photometry obtained with the Mount Laguna Observatory 1-m reflector of two recently-discovered SU UMa dwarf novae: V466 And and OT J011306.7+215250. V466 And was discovered as an optical transient at V 12.7 by K. Itagaki on September 1.6 UT (Yamaoka et al. 2008, IAU Circ. 8971,2). Our observations, which began a few days after discovery, span a total of 15 hr over the nights of 2008 September 4, 5, 6, and 25 UT. During the first three nights the object faded slowly from V 13.4 to V 14, and fell to V 16.8 by September 25 UT. The data from the first three nights reveal V 0.1 mag dips in the light curve that recur with a best-fit period of 0.05636(9) days. We interpret the observed modulation as the manifestation of the so-called "early superhumps" sometimes seen in the SU UMa systems. The second dwarf nova system, OT J011306.7+215250, was discovered on 2008 September 22 UT by Drake et al. (ATel #1734) as part of the Catalina Real-time Transient Survey. Shortly after discovery, we obtained 5 nights of photometry as the object faded rapidly from V 15.5 on September 25 UT to V 19 on September 29 UT. These data reveal superhumps with a period of 0.09445(3) days, which is one of the longest superhump periods known. We present light curves of both systems and discuss the physical implications of our observations.
This work is supported in part by NSF grant AST-0607682.
Babar R.
Burke Edward A.
Fernández Manuel
Girazian R. J. Z.
Heffner C. M.
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