期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 467, 期 2, 页码 2494-2503出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx207
关键词
binaries: close; stars: fundamental parameters; stars: individual:. i Ori; stars: massive; stars: oscillations
资金
- Austrian Research Promotion Agency (FFG)
- University of Vienna
- Technical University of Graz
- Canadian Space Agency (CSA)
- University of Toronto Institute for Aerospace Studies (UTIAS)
- Foundation for Polish Science & Technology (FNiTP MNiSW)
- National Science Centre (NCN)
- University of Toledo
- Helen Luedtke Brooks Endowed Professorship
- NSERC (Canada)
- FQRNT (Quebec)
- Natural Science and Engineering Research Council (NSERC) of Canada
- NCN [2016/21/B/ST9/01126, 2015/18/A/ST9/00578, 2011/01/M/ST9/05914, 2016/21/D/ST9/00656]
- NSF [AST1205732]
- Lee DuBridge Fellowship at Caltech
i Ori is a well-studied massive binary consisting of an O9 III + B1 III/IV star. Due to its high eccentricity (e = 0.764) and short orbital period (P-orb = 29.133 76 d), it has been considered to be a good candidate to show evidence of tidal effects; however, none have previously been identified. Using photometry from the BRIght Target Explorer (BRITE)-Constellation space photometry mission, we have confirmed the existence of tidal distortions through the presence of a heartbeat signal at periastron. We combine spectroscopic and light-curve analyses to measure the masses and radii of the components, revealing. Ori to be the most massive heartbeat system known to date. In addition, using a thorough frequency analysis, we also report the unprecedented discovery of multiple tidally induced oscillations in an O star. The amplitudes of the pulsations allow us to empirically estimate the tidal circularization rate, yielding an effective tidal quality factor Q similar to 4 x 10(4).
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