Počet záznamů: 1
Common-envelope ejection in massive binary stars Implications for the progenitors of GW150914 and GW151226
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SYSNO ASEP 0472116 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Common-envelope ejection in massive binary stars Implications for the progenitors of GW150914 and GW151226 Tvůrce(i) Kruckow, M.U. (DE)
Tauris, T.M. (DE)
Langer, N. (DE)
Szécsi, Dorottya (ASU-R) ORCID
Marchant, P. (DE)
Podsiadlowski, Ph. (US)Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 596, December (2016), A58/1-A58/13Poč.str. 13 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova stars ; evolution ; black holes Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA14-02385S GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000390797900106 EID SCOPUS 85002935925 DOI https://doi.org/10.1051/0004-6361/201629420 Anotace We analyse the common-envelope (CE) stage of the traditional formation channel in binaries where the first-formed compact object undergoes an in-spiral inside the envelope of its evolved companion star and ejects the envelope in this process. Massive stars in a wide range of metallicities and with initial masses of up to at least 115 M-circle dot may shed their envelopes and survive CE evolution, depending on their initial orbital parameters, similarly to the situation for intermediate-and low-mass stars with degenerate cores. In addition to being dependent on stellar radius, the envelope binding energies and lambda-values also depend on the applied convective core-overshooting parameter, whereas these structure parameters are basically independent of metallicity for stars with initial masses below 60 M-circle dot. Metal-rich stars greater than or similar to 60 M-circle dot become luminous blue variables and do not evolve to reach the red giant stage. We conclude that based on stellar structure calculations, and in the view of the usual simple energy budget analysis, events like GW150914 and GW151226 might be produced by the CE channel. Calculations of post-CE orbital separations, however, and thus the estimated LIGO detection rates, remain highly uncertain. Pracoviště Astronomický ústav Kontakt Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2017
Počet záznamů: 1