Počet záznamů: 1
Orbital and atmospheric parameters of two wide O-type subdwarf binaries: BD-11(o)162 and Feige 80
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SYSNO ASEP 0555511 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Orbital and atmospheric parameters of two wide O-type subdwarf binaries: BD-11(o)162 and Feige 80 Tvůrce(i) Molina, F. (DE)
Vos, J. (DE)
Németh, Péter (ASU-R) ORCID
Østensen, R. (US)
Vuković, M. (CL)
Tkachenko, A. (BE)
Van Winckel, H. (BE)Celkový počet autorů 7 Číslo článku A122 Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 658, February (2022)Poč.str. 22 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova galactic chemical evolution ; helium white-dwarfs ; final mass relation Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA18-20083S GA ČR - Grantová agentura ČR Způsob publikování Open access s časovým embargem (01.03.2023) Institucionální podpora ASU-R - RVO:67985815 UT WOS 000752558000006 EID SCOPUS 85124659231 DOI 10.1051/0004-6361/202141220 Anotace In this study, we aim to solve orbital and atmospheric parameters of two long-period sdO binaries and, for the first time, investigate the chemical composition of their main-sequence (MS) companions. HERMES high-resolution spectra are used to obtain radial velocities and solve their orbits. The GSSP code is used to derive the atmospheric parameters and photospheric chemical abundances of the MS companions. Stellar evolution models (MIST) are fitted to the companion atmospheric parameters to derive masses. The orbital and atmospheric parameters have been fully solved. Masses of the companions and the sdOs were obtained. The photospheric chemical abundances of the MS stars for elements with available lines in the optical range have been derived. They match general trends expected from Galactic chemical evolution but show a depletion of yttrium in both systems and an enrichment of carbon in the BD-11(o)162 MS. Conclusions. In the bimodal period-eccentricity diagram, the orbital parameters indicate that Feige 80 matches the same correlation as the majority of the systems. The analysis suggests that Feige 80 has a canonical subdwarf mass and followed a standard formation channel. However, BD-11(o)162 is an exceptional system with a lower mass. It also shows a C overabundance, which could be caused by a higher progenitor mass. The Y depletion in the MS companions could indicate the existence of a circumbinary disk in these systems' pasts. Nevertheless, a chemical analysis of a larger sample is necessary to draw strong conclusions. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2023 Elektronická adresa https://doi.org/10.1051/0004-6361/202141220
Počet záznamů: 1