Time Series Photometry of DQ Herculis: An Updated Ephemeris

Document Type


Degree Name

Master of Science (MS)


Physics and Astronomy

Date of Award

Spring 2021


Cataclysmic variable Old Nova DQ Herculis (N1934) is an eclipsing binary with anorbital period of 4h39m and is a prototype for a fast spinning accreting magnetic white dwarf. The white dwarf is blocked from our line of sight due to the extreme inclination angle of the accretion disk. DQ Herculis is known for its 71 second oscillation found in the light curve. We present a new photometric study of the eclipse and 71 second oscillations of DQ Herculis. With observations provided to us by the AAVSO and CBA, along with observations done at McDonald Observatory and the SARA consortium, we calculate an updated O-C phase diagram along with updated ephemerides for the eclipse and 71 second signals. We also report new eclipse timings.


Matt A. Wood

Subject Categories

Astrophysics and Astronomy | Physical Sciences and Mathematics