PoS - Proceedings of Science
Volume 342 - Accretion Processes in Cosmic Sources – II (APCS2018) - Accretion onto White Dwarfs, Neutron Stars & Black Holes
Optical Photometry of Six Eclipsing Polars: DP Leo, J1312+1737, HS Cam, FL Cet, EP Dra, and CRTS 0350+3232.
P.A. Mason
Full text: pdf
Pre-published on: December 21, 2019
Published on: February 14, 2020
I present optical photometry obtained in order to address several long-standing problems in the field of magnetic cataclysmic variables (MCVs). Specifically, the important problems concerning, both long- and short-term evolution of the binary and the origin of the variable accretion rate in polars. Numerous high time-resolution light curves of eclipsing polars using the 2.1-m telescope of McDonald Observatory have been obtained in order to investigate potential period changes that may be due to one or more factors. Period changes on the time-scale of years to decades may originate due to changes in accretion rate, magnetic cycles of the donor, and long term secular evolution. By collecting many high-precision light curves, the effects due to binary evolution such as angular momentum loss by gravitational radiation and donor star winds may be studied. We present 1-5 second time resolution photometry of six polars and long-term (9 yr) photometric sampling by the Catalina Real-Time Transit Survey (CRTS) of the same binaries. Preliminary results in this regard are given, emphasizing a range of features seen in the light curves of the polars DP Leo, J1312+1737, HS Cam, FL Cet, EP Dra, and CRTS 0350+3232. Features such as pre-eclipse absorption dips, un-eclipsed accretion stream emission, and one vs. two spot accretion are observed from system to system and within single binaries as a function of accretion rate. The combination of high-speed photometry and long-term monitoring will aid in this effort.
DOI: https://doi.org/10.22323/1.342.0021
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.