Accueil > Publications > Catalogue POP > 2019

Catalogue POP – Notice individuelle de publication

Pablo Herbert, Richardson N. D., Fuller J., Rowe J., Moffat A. F. J., Kuschnig R., Popowicz A., Handler Gerald, Neiner Coralie, Pigulski Andrzej, Wade Gregg, Weiss Werner W., Buysschaert Bram, Ramiaramanantsoa T., Bratcher A. D., Gerhartz C. J., Greco J. J., Hardegree-Ullman K., Lembryk L., Oswald W. L.

The most massive heartbeat: an in-depth analysis of iota Orionis

Monthly notices of the Royal Astronomical Society, 2017, vol. 467, pp. 2494-2503

Référence DOI : 10.1093/mnras/stx207
Référence ADS : 2017MNRAS.467.2494P

Résumé :

iota 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<SUB>orb</SUB> = 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 iota 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 ~ 4 × 10<SUP>4</SUP>.

Retour au catalogue