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The Most Massive Heartbeat: Finding the Pulse of ι Orionis

Published online by Cambridge University Press:  28 July 2017

Herbert Pablo ,
Noel Richardson ,
Jim Fuller ,
Anthony F. J. Moffat  and
BEST and Ritter Observing team
Herbert Pablo
Affiliation:
Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada email:hpablo@astro.umontreal.ca
Noel Richardson
Affiliation:
Ritter Observatory, Department of Physics and Astronomy, The University of Toledo, Toledo, OH 43606-3390, USA
Jim Fuller
Affiliation:
TAPIR, Walter Burke Institute for Theoretical Physics, Mailcode 350-17, Caltech, Pasadena, CA 91125, USA Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA
Anthony F. J. Moffat
Affiliation:
Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada email:hpablo@astro.umontreal.ca
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Abstract

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ι Orionis is a massive binary system consisting of O9III + B1 III/IV stars. Though the system has been well studied, much about its fundamental properties have been difficult to determine. In this paper we report on the discovery of the heartbeat phenomenon in ι Orionis making it the most massive heartbeat system currently known. Using this phenomenon we have found empirical values for the masses and radii of both components. Moreover, we report the detection of tidally induced oscillations in an O-type star for the first time. These discoveries open a new avenue for exploring asteroseismology in massive stars.

Keywords

(stars:) binaries (including multiple): close, stars: fundamental parameters (classification, masses, radii), stars: oscillations (including pulsations), stars: individual: ι OriOri
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S329: The Lives and Death-Throes of Massive Stars , November 2016 , pp. 181 - 185
Copyright
Copyright © International Astronomical Union 2017 

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