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Title: 2FGL J1653.6–0159: A NEW LOW IN EVAPORATING PULSAR BINARY PERIODS

We have identified an optical binary with orbital period P{sub b} = 4488 s as the probable counterpart of the Fermi source 2FGL J1653.6–0159. Although pulsations have not yet been detected, the source properties are consistent with an evaporating millisecond pulsar binary; this P{sub b} = 75 minutes is the record low for a spin-powered system. The heated side of the companion shows coherent radial-velocity variations, with amplitude K = 666.9 ± 7.5 km s{sup –1} for a large mass function of f(M) = 1.60 ± 0.05 M {sub ☉}. This heating suggests a pulsar luminosity ∼3 × 10{sup 34} erg s{sup –1}. The colors and spectra show an additional blue component dominating at binary minimum. Its origin is, at present, unclear. This system is similar to PSR J1311–3430, with a low-mass H-depleted companion, a dense shrouding wind and, likely, a large pulsar mass.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Physics, Stanford University, Stanford, CA 94305-4060 (United States)
  2. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)
  3. Astrophysics Science Division, NASA Goddard Space Flight Center, MC 661, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
22364976
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 793; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; COLOR; EMISSION SPECTRA; GAMMA RADIATION; LUMINOSITY; MASS; PULSARS; PULSATIONS; RADIAL VELOCITY; SPIN; STARS; STELLAR WINDS