دورية أكاديمية
Tracing the evolution of short-period binaries with super-synchronous fast rotators
| العنوان: | Tracing the evolution of short-period binaries with super-synchronous fast rotators |
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| المؤلفون: | Britavskiy, Mikola, Renzo, M., Nazé, Yaël, Rauw, Grégor, Vynatheya, P. |
| المصدر: | Astronomy and Astrophysics, 684, A35 (21 pages) (2024) |
| بيانات النشر: | EDP Sciences, 2024. |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | astro-ph.SR, astro-ph.IM, Space and Planetary Science, Astronomy and Astrophysics, Physical, chemical, mathematical & earth Sciences, Space science, astronomy & astrophysics, Physique, chimie, mathématiques & sciences de la terre, Aérospatiale, astronomie & astrophysique |
| الوصف: | The initial distribution of rotational velocities of stars is still poorlyknown, and how the stellar spin evolves from birth to the various end points ofstellar evolution is an actively debated topic. Binary interactions are ofteninvoked to explain the existence of extremely fast-rotating stars ($v\sin\,i$$\gtrsim$ 200 $km\,s^{-1}$). The primary mechanisms through which binaries canspin up stars are tidal interactions, mass transfer, and possibly mergers. Toevaluate these scenarios, we investigated in detail the evolution of threeknown fast-rotating stars in short-period spectroscopic and eclipsing binaries,namely HD 25631, HD 191495, and HD 46485, with primaries of masses of 7, 15,and 24 $M_{\odot}$, respectively, with companions of $\sim1\,M_\odot$ andorbital periods of less than 7 days. These systems belong to a recentlyidentified class of binaries with extreme mass ratios, whose evolutionaryorigin is still poorly understood. We evaluated in detail three scenarios thatcould explain the fast rotation observed in these binaries: it could beprimordial, a product of mass transfer, or the result of a merger within anoriginally triple system. We computed grids of single and binary MESA modelsvarying tidal forces and initial binary architectures to investigate theevolution and reproduce observational properties of these systems. We findthat, because of the extreme mass-ratio between binary components, tides have alimited impact, regardless of the prescription used, and that the observedshort orbital periods are at odds with post-mass-transfer scenarios. The mostlikely scenario to form such young, rapidly rotating, and short-period binariesis primordial rotation, implying that the observed binaries are pre-interactionones. These binaries show that the initial spin distribution of massive starscan have a wide range of rotational velocities. |
| نوع الوثيقة: | journal article http://purl.org/coar/resource_type/c_6501 article peer reviewed |
| اللغة: | English |
| Relation: | https://www.aanda.org/10.1051/0004-6361/202348484/pdf; urn:issn:0004-6361; urn:issn:1432-0746 |
| DOI: | 10.1051/0004-6361/202348484 |
| URL الوصول: | https://orbi.uliege.be/handle/2268/316031 |
| حقوق: | open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
| رقم الأكسشن: | edsorb.316031 |
| قاعدة البيانات: | ORBi |
| DOI: | 10.1051/0004-6361/202348484 |
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