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- W3104378111 abstract "We present optical photometric and spectroscopic observations of the likely stellar counterpart to the unassociated emph{Fermi}-Large Area Telescope (LAT) $gamma$-ray source 2FGL J0846.0+2820, selected for study based on positional coincidences of optical variables with unassociated LAT sources. Using optical spectroscopy from the SOAR telescope, we have identified a late-G giant in an eccentric ($e$ = 0.06) 8.133 day orbit with an invisible primary. Modeling the spectroscopy and photometry together lead us to infer a heavy neutron star primary of $sim 2 M_{odot}$ and a partially stripped giant secondary of $sim 0.8 M_{odot}$. H$alpha$ emission is observed in some of the spectra, perhaps consistent with the presence of a faint accretion disk. We find the $gamma$-ray flux of 2FGL J0846.0+2820 dropped substantially in mid-2009, accompanied by an increased variation in the optical brightness, and since then it has not been detected by emph{Fermi}. The long period and giant secondary are reminiscent of the $gamma$-ray bright binary 1FGL J1417.7--4407, which hosts a millisecond pulsar apparently in the final stages of the pulsar recycling process. The discovery of 2FGL J0846.0+2820 suggests the identification of a new subclass of millisecond pulsar binaries that are the likely progenitors of typical field millisecond pulsars." @default.
- W3104378111 created "2020-11-23" @default.
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- W3104378111 date "2017-12-08" @default.
- W3104378111 modified "2023-10-13" @default.
- W3104378111 title "2FGL J0846.0+2820: A New Neutron Star Binary with a Giant Secondary and Variable<i>γ</i>-Ray Emission" @default.
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- W3104378111 doi "https://doi.org/10.3847/1538-4357/aa9937" @default.
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