GSC2.3 N152008120 - a new SU UMa-type dwarf nova in Draco

TL;DR

This paper reports the discovery and detailed observational analysis of a new SU UMa-type dwarf nova in Draco, including its superoutburst characteristics, superhump period, and period changes.

Contribution

It provides the first recorded superoutburst of this dwarf nova, with detailed measurements of its light curve, superhump period, and period evolution, expanding knowledge of SU UMa-type systems.

Findings

Superoutburst reached magnitude 14.9 with a 6-magnitude amplitude.

Superhump period was approximately 0.07117 days, with a period shortening observed.

Rebrightening occurred 11 days after the main outburst.

Abstract

We report observations during 2008 October of the first recorded superoutburst of a previously unknown SU UMa-type dwarf nova in Draco located at 19h 14m 43.52s +60d 52m 14.1s (J2000). Simbad lists a 21st magnitude star at this position with identifiers GSC2.3 N152008120 and USNO-B1.0 1508-0249096. The outburst reached magnitude 14.9, its amplitude was approximately 6 magnitudes and its duration at least 11 days. About 11 days after the end of the main outburst there was a short-lived rebrightening by more than 2 magnitudes. Superhumps were observed with a mean period of 0.07117(1) d and amplitude 0.12 mag. There was a distinct shortening in the superhump period around cycle 80 with Psh = 0.07137(2) d before and Psh = 0.07091(2) d after. We saw weak evidence of an increasing Psh before cycle 80 with dPsh/dt = 3.4(2.0) * 10-5.