Spectrum of Bright Transient ASASSN-13ax: Hydrogen-Rich Dwarf Nova in Outburst
ATel #5195; C. M. Copperwheat, D. F. Bersier (LJMU), B. J. Shappee, C. S. Kochanek, K. Z. Stanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullens, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory), J. Brimacombe (Coral Towers Observatory)
on 5 Jul 2013; 18:00 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Cataclysmic Variable, Transient
Referred to by ATel #: 5273
We observed the bright transient ASASSN-13ax (ATEL #5186) on UT 2013 July 2.9 for 15
minutes with the FRODOspec spectrograph mounted on the robotic 2.0m
Liverpool Telescope (LT). We obtained two simultaneous spectra, one
covering the wavelength range 390-570 nm with R=2600, and one covering
580-900 nm with R=2200. We detect a blue continuum with broad Balmer
absorption lines, as well as Helium absorption at 447 nm. Weak
emission lines are visible within the Halpha and Hbeta features. These
features are indicative of the disc-dominated spectrum of a
hydrogen-rich dwarf nova in outburst.
ASASSN-13ax was seen again by ASAS-SN on UT 2013 July 4.41 with V=14.1,
compared to V=13.5 on 2013 July 1.41.