The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5

TL;DR

This study presents detailed spectroscopic and photometric analysis of the pre-main-sequence eclipsing binary ASAS J052821+0338.5, determining its fundamental stellar parameters, orbital characteristics, and evolutionary status, confirming its membership in the Orion OB1a subassociation.

Contribution

First detailed spectroscopic and photometric analysis of this pre-main-sequence eclipsing binary, deriving its fundamental parameters and confirming its evolutionary status.

Findings

Component masses of 1.38 and 1.33 solar masses.

Orbital period of 3.87 days.

Located at 280 +/- 30 pc, member of Orion OB1a.

Abstract

In this paper we present the first results of a detailed spectroscopic and photometric analysis of the V = 11.7m eclipsing binary ASAS J052821+0338.5. With the FIES spectrograph at the Nordic Optical Telescope we have obtained a series of high-resolution spectra (R=47000) covering the entire orbit of the system. In addition we obtained simultaneous broadband photometry from three small aperture telescopes. From these spectroscopic and photometric data we have derived the system's orbital parameters and determined the fundamental stellar parameters of the two components. Our results indicate that ASAS J052821+0338.5 is a K1/K3 pre-main-sequence eclipsing binary, with component masses of 1.38 M_sun and 1.33 M_sun and a period of 3.87 days, located at a distance of 280 +/- 30 pc. The kinematics, physical location and the evolutionary status of the two stars suggest that ASAS J052821+0338.5 is a member of the approximately 11 Myr old Orion OB1a subassociation. The systems also exhibits smooth 0.15m out-of-eclipse variations that are similar to those found in RS CVn binaries. Furthermore the parameters we derived are consistent with the 10-13 Myr isochrones of the popular Baraffe stellar evolutionary models.