A new look at the symbiotic star RW Hydrae

TL;DR

This paper provides updated physical parameters of the symbiotic star RW Hydrae using combined photometric and spectroscopic data, improving previous estimates and offering new insights into its stellar characteristics.

Contribution

It introduces a comprehensive modeling approach that simultaneously fits light and radial velocity curves to derive more accurate stellar parameters of RW Hydrae.

Findings

Mass ratio q=4.2

Primary star mass M1=0.8 M_sun

Secondary star radius R2=145 R_sun

Abstract

We present new estimates of the basic stellar parameters of the non-eruptive, eclipsing symbiotic system, RW Hydrae. A set of photometric and spectroscopic data was used to model this object simultaneously from the light and radial velocity curves. With new spectroscopic data we were able to improve previous results known from the literature and derive physical parameters of the system: $q=4.2$, $M_1=0.8 \rm M_\odot$, $M_2=3.4 \rm M_\odot$, $R_1=0.2 \rm R_\odot$, $R_2=145 \rm R_\odot$, $a=350 \rm R_\odot$, and $i=75^\circ$.