Absolute Properties of An Overcontact Binary HH Boo

TL;DR

This study presents detailed photometric and spectroscopic analysis of the overcontact binary HH Boo, revealing its physical parameters, orbital period variation, and classification as an A-type W UMa binary.

Contribution

The paper provides the first comprehensive analysis combining light curves and radial velocity data to determine the physical properties and orbital behavior of HH Boo.

Findings

Mass transfer or mass loss is occurring in HH Boo.

Primary and secondary masses are 0.92 and 0.58 Msun, respectively.

HH Boo is classified as an A-type W UMa binary.

Abstract

We obtained multi-colour light curves of HH Boo. We analysed the orbital period variation of the system. The analysis indicated that there is possible mass transfer from the second component to the primary or mass loss with -5.04x10-7 Msun per year. Re-analysing the available radial velocity curve, we analysed the light curves. The inclination (i) of the system was found to be 69.71(0.16) deg, while the semi-major axis (a) was computed as 2.246(0.064) Rsun. The mass of the primary component was found to be 0.92(0.08) Msun, while it was obtained as 0.58(0.06) Msun for the secondary component. The radius of the primary component was computed as 0.98(0.03) Rsun, while it was computed as 0.80(0.02) Rsun for the secondary component. We demonstrated that HH Boo should be a member of the A-type subclass of W UMa binaries.