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Clarifying the population of HMXBs in the Small Magellanic Cloud

Published online by Cambridge University Press:  30 December 2019

Grigoris Maravelias Open the ORCID record for Grigoris Maravelias [Opens in a new window] ,
Andreas Zezas ,
Vallia Antoniou Open the ORCID record for Vallia Antoniou [Opens in a new window] ,
Despina Hatzidimitriou  and
Frank Haberl
Grigoris Maravelias
Affiliation:
IESL, Foundation for Research and Technology-Hellas, Heraklion, Greece email: gmaravel@physics.uoc.gr Department of Physics, University of Crete, Heraklion, Greece
Andreas Zezas
Affiliation:
IESL, Foundation for Research and Technology-Hellas, Heraklion, Greece email: gmaravel@physics.uoc.gr Department of Physics, University of Crete, Heraklion, Greece Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
Vallia Antoniou
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
Despina Hatzidimitriou
Affiliation:
Department of Physics, National and Kapodistrian University of Athens, Zografou, Greece IAASARS, National Observatory of Athens, Athens, Greece
Frank Haberl
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
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Abstract

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Almost all confirmed optical counterparts of HMXBs in the SMC are OB stars with equatorial decretion disks (OBe). These sources emit strongly in Balmer lines and standout when imaged through narrow-band Hα imaging. The lack of secure counterparts for a significant fraction of the HMXBs motivated us to search for more. Using the catalogs for OB/OBe stars (Maravelias et al.2017) and for HMXBs (Haberl & Sturm 2016) we detect 70 optical counterparts (out of 104 covered by our survey). We provide the first identification of the optical counterpart to the source XTEJ0050-731. We verify that 17 previously uncertain optical counterparts are indeed the proper matches. Regarding 52 confirmed HMXBs (known optical counterparts with Hα emission), we detect 39 as OBe and another 13 as OB stars. This allows a direct estimation of the fraction of active OBe stars in HMXBs that show Hα emission at a given epoch to be at least ∼75% of their total HMXB population.

Keywords

Magellanic Cloudsstars: early-typestars: emission-lineBeX-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 350 - 352
Copyright
© International Astronomical Union 2019 

References

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