Revisiting symbiotic binaries with interferometry: II. New PIONIER data

Abstract

Symbiotic stars, which generally comprise a red giant and an accreting white dwarf, are excellent laboratories to understand mass transfer in wide binaries, with application to a wide family of systems. One of the fundamental questions is how mass is transferred from the red giant to the white dwarf. We use interferometric measurements made with the VLTI/PIONIER instrument, combined with Gaia data, to measure the radius of the giant in seven symbiotic systems. We further place the giants in the H-R diagramme, which allows us to estimate their mass and to show that they are all very evolved and likely on the asymptotic giant branch. We compare our measured giant radii to their Roche-lobe radius and show that, except for ZZ CMi, all giants are well within their Roche lobe and that mass transfer likely takes place via stellar wind. Our interferometric data provide further evidence that the giant in ZZ CMi (nearly) fills its Roche lobe. Our conclusions are still hampered by the poor characterisation of some of the giants or their binary orbit, and we encourage the community to make an effort to provide these.

Accepted by A&A

References in corpus (20)

• The Gaia mission
• Gaia Data Release 3: Summary of the content and survey properties
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• PIONIER: a 4-telescope visitor instrument at VLTI
• The ASAS-SN Catalog of Variable Stars III: Variables in the Southern TESS Continuous Viewing Zone
• Symbiotic stars in X-rays
• Barium & related stars and their white-dwarf companions I. Giant stars
• Astrometric Identification of Nearby Binary Stars I: Predicted Astrometric Signals
• Ecology of Blue Straggler Stars
• Roche-lobe filling factor of mass-transferring red giants - the PIONIER view
• Characterisation of Galactic carbon stars and related stars from Gaia-EDR3
• Chemical abundance analysis of symbiotic giants - III. Metallicity and CNO abundance patterns in 24 southern systems
• Symbiotic stars in the era of modern ground- and space-based surveys
• High-resolution X-ray Spectra Of The Symbiotic Star SS73 17
• Resolving the mass transfer in the symbiotic recurrent nova T Coronae Borealis
• Symbiotic stars in X-rays III: Suzaku observations
• Discovery of fast, large-amplitude optical variability of V648 Car (=SS73-17)
• The symbiotic binary ZZ CMi: intranight variability and suggested outbursting nature
• Unequivocal detection of the tidal deformation of a red giant in a binary system via interferometry