Revised ephemeris and orbital period derivative of the supersoft X-ray source CAL 87 based on 34 years of observations

P. E. Stecchini, F. Jablonski, M. P. Diaz +4

In this study, we present an analysis of over 34 years of observational data from CAL 87, an eclipsing supersoft X-ray source. The primary aim of our study, which combines previous…