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The Symbiotic Stars
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Any white dwarf or neutron star that accretes enough material from a red giant companion, such that this interaction can be detected at some wavelength, is currently termed Symbiotic Star (typical P(orb)=2-3 years). In the majority of ~400 known systems, the WD burns nuclearly at its surface the accreted material, and the resulting high temperature (T(eff)=10(^5)~K) and luminosity (L(hot)=10(^3)-10(^4) Lsun) allow ionization of a large fraction of the cool giant's wind, making such symbiotic stars easily recognizable through the whole Galaxy and across the Local Group. X-ray observations are now revealing the existence of a parallel (and larger ?) population of optically-quiet, accreting-only symbiotic stars. Accretion flows and disks, ionization fronts and shock, complex 3D geometries and new evolution channels are gaining relevance and are reshaping our understanding of symbiotic stars. We review the different types of symbiotic stars currently in the family and their variegated outburst behaviors through an unified evolution scheme connecting them all.
Forward citations
Cited by 6 Pith papers
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Detection of Millimeter-Wavelength Flares from Two Accreting White Dwarf Systems in the SPT-3G Galactic Plane Survey
The first blind millimeter-wave search of the Galactic Plane found two roughly one-day flares from accreting white dwarf binaries, with isotropic luminosities near 10^31 erg/s.
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A systematic assessment of the short-term X-ray behaviour of the $\gamma$ Cas analogues
Kilosecond X-ray periodicities are persistent in five γ Cas analogues, with periods and pulsed fractions matching intermediate-polar white dwarfs.
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Symbiotic stars in Galactic open clusters
CQ Dra, a confirmed symbiotic star, appears to belong to the open cluster HSC 1224, giving an age near log t ≈ 9.4, about 2.5 billion years.
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CGCS 6306, another X-ray-emitting asymptotic giant branch star confirmed to be a symbiotic binary
X-ray and optical observations show CGCS 6306 is a symbiotic binary with a white dwarf accreting from a carbon Mira donor.
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Symbiotic star candidates in Gaia Data Release 3
A Gaia DR3 machine-learning search yields 1,674 new symbiotic star candidates, 25 with X-ray emission.
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New Symbiotic Stars from LAMOST DR10 Spectra and Multi-band Photometry
A LAMOST DR10 survey yields two new symbiotic stars plus 12 accreting-only symbiotic candidates with inferred white dwarf temperatures near 10,000 to 15,000 K.
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