RT Journal Article
T1 The first confirmed superoutburst of the dwarf nova GALEX J215818.5+241924
A1 Shears, Jeremy
A1 Koff, Robert
A1 Masi, G.
A1 Miguel Agustino, Enrique de
A1 Miller, Ian
A1 Roberts, George
A1 Sabo, Richard
A1 Stein, William
A1 Ulowetz, Joseph
AB In 2011 October an optical transient was reported in Pegasus as a possible nova. The object had an ultraviolet counterpart, GALEX J215818.5+241924. In this paper we present follow-up photometry of the object which revealed the presence of superhumps, with peak-to-peak amplitude of up to 0.22 magnitudes, diagnostic of it being a member of the SU UMa family of dwarf novae. The outburst amplitude was 4.6 magnitudes and it lasted at least 10 days, with a maximum brightness of magnitude 14.3. We determined the mean superhump period from our first 5 nights of observations as Psh = 0.06728(21) d. However analysis of the O-C residuals showed a dramatic evolution in Psh during the outburst. During the first part of the plateau phase the period increased with dPsh/dt = +2.67(15) x 10-4. There was then an abrupt change following which the period decreased with dPsh/dt = -2.08(9)10-4. We found a signal in the power spectrum of the photometry which we tentatively interpret as the orbital signal with Porb = 0.06606(35) d. Thus the superhump period excess was ε = 0.020(8), such value being consistent with other SU UMa systems of similar orbital period.
PB Cornell University
YR 2013
FD 2013
LK https://hdl.handle.net/10272/21760
UL https://hdl.handle.net/10272/21760
LA eng
NO Shears, J., Koff, R., Masi, G., de Miguel, E., Miller, I., Roberts, G., Sabo, R., Stein, W., & Ulowetz, J. (2012). The first confirmed superoutburst of the dwarf nova GALEX J215818.5+241924 (Version 2). arXiv. https://doi.org/10.48550/ARXIV.1205.0898
DS Repositorio Institucional de la Universidad de Huelva
RD 2 jun 2026