Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries

We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the c...

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Veröffentlicht in:The Astrophysical journal 2019-02, Vol.872 (1), p.42
Hauptverfasser: Strader, Jay, Swihart, Samuel, Chomiuk, Laura, Bahramian, Arash, Britt, Chris, Cheung, C. C., Dage, Kristen, Halpern, Jules, Li, Kwan-Lok, Mignani, Roberto P., Orosz, Jerome A., Peacock, Mark, Salinas, Ricardo, Shishkovsky, Laura, Tremou, Evangelia
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container_issue 1
container_start_page 42
container_title The Astrophysical journal
container_volume 872
creator Strader, Jay
Swihart, Samuel
Chomiuk, Laura
Bahramian, Arash
Britt, Chris
Cheung, C. C.
Dage, Kristen
Halpern, Jules
Li, Kwan-Lok
Mignani, Roberto P.
Orosz, Jerome A.
Peacock, Mark
Salinas, Ricardo
Shishkovsky, Laura
Tremou, Evangelia
description We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78 0.09 M with a dispersion of = 0.21 0.09. Neutron stars with masses in excess of 2 M are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36 0.04 M with a scatter of = 0.15 0.04 M , and a tail possibly extending up to 0.7-0.9 M . Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. Among redbacks, the median efficiency of converting the pulsar spin-down energy to γ-ray luminosity is ∼10%.
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source IOP Publishing Free Content
subjects Astrophysics
binaries: spectroscopic
Companion stars
Constraint modelling
Energy conversion efficiency
gamma rays: stars
Hydrogen
Luminosity
Millisecond pulsars
Neutron stars
Neutrons
Physics
Pulsars
pulsars: general
Radial velocity
Spectroscopy
Spectrum analysis
stars: neutron
X-rays: binaries
title Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries
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