A 2-d orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397-Reference-Cited by-同舟云学术

A 2-d orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397

Published:2021-03-11 Issue:1 Volume:503 Page:L51-L55
ISSN:1745-3925
Container-title:Monthly Notices of the Royal Astronomical Society: Letters
language:en
Short-container-title:

Author:

Marcano Manuel Pichardo¹^ORCID,Rivera Sandoval Liliana E¹²,Maccarone Thomas J¹,Zhao Yue²^ORCID,Heinke Craig O²^ORCID

Affiliation:

1. Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409, USA

2. Department of Physics, University of Alberta, CCIS 4-183, Edmonton, AB T6G 2E1, Canada

Abstract

ABSTRACT We report optical modulation of the companion to the X-ray source U18 in the globular cluster NGC 6397. U18, with combined evidence from radio and X-ray measurements, is a strong candidate as the second redback in this cluster, initially missed in pulsar searches. This object is a bright variable star with an anomalous red colour and optical variability (∼0.2 mag in amplitude) with a periodicity ∼1.96 d that can be interpreted as the orbital period. This value corresponds to the longest orbital period for known redback candidates and confirmed systems in Galactic globular clusters and one of the few with a period longer than 1 d.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

http://academic.oup.com/mnrasl/advance-article-pdf/doi/10.1093/mnrasl/slab024/36577789/slab024.pdf

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