Revised Ephemerides for V1776 Cygni and QU Vulpeculae

Details Revised Ephemerides for V1776 Cygni and QU Vulpeculae Revised Ephemerides for V1776 Cygni and QU Vulpeculae

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0915l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #09.15; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Time-resolved CCD observations of two eclipsing cataclysmic variables: the novalike variable V1776 Cyg (Lanning 90), and the classical nova, QU Vul (Nova Vulpeculae 1984#2) are presented. Eclipse timings (a total of four for V1776 Cyg and five for QU Vul) have been measured in order to update the orbital ephemerides of these systems. After including eclipse timings from the literature, the following updated ephemerides have been determined. For V1776 Cyg: T_min = HJD 2,446,716.6795(3) + 0.16473866(1) E, and for QU Vul: T_min = HJD 2,449,514.8780(2) + 0.111764743(7) E. QU Vul is a particularly interesting system, being the archetypal "neon nova" (Gehrz et al. 1985 ApJL, 298, L47) with a period near the middle of the 2-3 hr "gap" in the orbital period distribution for cataclysmic variables. Our most recent observations show that QU Vul is continuing to fade following its outburst in 1984. Specifically, we found QU Vul at V=19.4 on 02-Sep-2005 UT, which is 1.5 mag fainter than the value of V=17.9 measured by Shafter et al. (1995 ApJL, 448, L33) roughly a decade earlier. This work has been supported in part through an REU grant (AST-0453609) to SDSU.

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