Universität zu Köln

Menon, Athira, Langer, Norbert, de Mink, Selma E., Justham, Stephen, Sen, Koushik, Szecsi, Dorottya ORCID: 0000-0001-6473-7085, de Koter, Alex, Abdul-Masih, Michael ORCID: 0000-0001-6566-7568, Sana, Hugues ORCID: 0000-0001-6656-4130, Mahy, Laurent ORCID: 0000-0003-0688-7987 and Marchant, Pablo (2021). Detailed evolutionary models of massive contact binaries - I. Model grids and synthetic populations for the Magellanic Clouds. Mon. Not. Roy. Astron. Soc., 507 (4). S. 5013 - 5034. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

The majority of close massive binary stars with initial periods of a few days experience a contact phase, in which both stars overflow their Roche lobes simultaneously. We perform the first dedicated study of the evolution of massive contact binaries and provide a comprehensive prediction of their observed properties. We compute 2790 detailed binary models for the Large and Small Magellanic Clouds each, assuming mass transfer to be conservative. The initial parameter space for both grids span total masses from 20 to 80 M-circle dot, orbital periods of 0.6-2 d and mass ratios of 0.6-1.0. We find that models that remain in contact over nuclear time-scales evolve towards equal masses, echoing the mass ratios of their observed counterparts. Ultimately, the fate of our nuclear-time-scale models is to merge on the main sequence. Our predicted period-mass ratio distributions of O-type contact binaries are similar for both galaxies, and we expect 10 such systems together in both Magellanic Clouds. While we can largely reproduce the observed distribution, we overestimate the population of equal-mass contact binaries. This situation is somewhat remedied if we also account for binaries that are nearly in contact. Our theoretical distributions work particularly well for contact binaries with periods <2 d and total masses less than or similar to 45 M-circle dot. We expect stellar winds, non-conservative mass transfer, and envelope inflation to have played a role in the formation of the more massive and longer-period contact binaries.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Menon, Athira UNSPECIFIED UNSPECIFIED UNSPECIFIED Langer, Norbert UNSPECIFIED UNSPECIFIED UNSPECIFIED de Mink, Selma E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Justham, Stephen UNSPECIFIED UNSPECIFIED UNSPECIFIED Sen, Koushik UNSPECIFIED UNSPECIFIED UNSPECIFIED Szecsi, Dorottya UNSPECIFIED orcid.org/0000-0001-6473-7085 UNSPECIFIED de Koter, Alex UNSPECIFIED UNSPECIFIED UNSPECIFIED Abdul-Masih, Michael UNSPECIFIED orcid.org/0000-0001-6566-7568 UNSPECIFIED Sana, Hugues UNSPECIFIED orcid.org/0000-0001-6656-4130 UNSPECIFIED Mahy, Laurent UNSPECIFIED orcid.org/0000-0003-0688-7987 UNSPECIFIED Marchant, Pablo UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-601152
DOI:	10.1093/mnras/stab2276
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	507
Number:	4
Page Range:	S. 5013 - 5034
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GAMMA-RAY BURSTS; BLACK-HOLE MERGERS; CLOSE BINARY; PRESUPERNOVA EVOLUTION; ECLIPSING BINARIES; O-TYPE; STELLAR MERGERS; OBSERVATIONAL CAMPAIGN; FUNDAMENTAL PARAMETERS; OVERCONTACT BINARIES Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/60115