SIMBAD references

2017ApJ...844..150H - Astrophys. J., 844, 150-150 (2017/August-1)

A likely redback millisecond pulsar counterpart of 3FGL J0838.8-2829.

HALPERN J.P., STRADER J. and LI M.

Abstract (from CDS):

We obtained new optical observations of the X-ray source XMMU J083850.38-282756.8, the previously proposed counterpart of the γ-ray source 3FGL J0838.8-2829. Time-series photometry in the r band reveals periodic modulation of ~1 mag that is characteristic of the heating of the photosphere of a low-mass companion star by a compact object. The measured orbital period is 5.14817 ± 0.00012 hr. The shape of the light curve is variable, evidently due to the effects of flaring and asymmetric heating. Spectroscopy reveals a companion of type M1 or later, having a radial velocity amplitude of 315 ± 17 km s–1, with period and phasing consistent with the heating interpretation. The mass function of the compact object is 0.69±0.11 M, which allows a neutron star in a high-inclination orbit. Variable, broad Hα emission is seen, which is probably associated with a wind from the companion. These properties, as well as the X-ray and γ-ray luminosities at the inferred distance of 1.7 kpc, are consistent with a redback millisecond pulsar in its non-accreting state. A search for radio pulsations is needed to confirm this interpretation and derive complete system parameters for modeling, although absorption by the ionized wind could hinder such detection.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): gamma rays: stars - pulsars: general - X-rays: individual: XMMU J083850.38282756.8 - X-rays: individual: XMMU J083850.38282756.8

Simbad objects: 18

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2021.06.25-14:36:52

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