OGLE-LMC-ECL-09937: The Most Massive Algol-Type Binary System with a Mass Measurement Accurate to 2%
D.M. Skowron1,
M. Kourniotis2,3,
J.L. Prieto4,5,
N. Castro6,
A.Z. Bonanos3 and
D. Pieñkowski1
1Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
e-mail: dszczyg@astrouw.edu.pl
2Astronomický ústav AVČR, Ondřejov, 25165, Czech Republic
3IAASARS, National Observatory of Athens, Penteli 15236, Greece
4Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales,
Av. Ejército 441, Santiago, Chile
5Millennium Institute of Astrophysics, Santiago, Chile
6Department of Astronomy, University of Michigan, 1805 S.University, Ann Arbor,
MI 48109, USA
Received: December 11, 2017
ABSTRACT
This paper presents a detailed analysis of the light and radial
velocity curves of the semi-detached eclipsing binary system
OGLE-LMC-ECL-09937. The system is composed of a hot, massive and
luminous primary star of a late-O spectral type, and a more evolved,
but less massive and luminous secondary, implying an Algol-type
system that underwent a mass transfer episode. We derive masses of
21.04±0.34 M☉ and
7.61±0.09 M☉ and radii of
9.93±0.06 R☉ and
9.18±0.04 R☉, for the primary and the
secondary component, respectively, which make it the most massive
known Algol-type system with masses and radii of the components
measured with <2% accuracy. Consequently, the parameters of
OGLE-LMC-ECL-09937 provide an important contribution to the sparsely
populated high-mass end of the stellar mass distribution, and an
interesting object for stellar evolution studies, being a possible
progenitor of a binary system composed of two neutron stars.
Key words:
binaries: eclipsing - Stars: early-type - Stars: fundamental
parameters - Stars: massive
back
