2012ApJ...751...99T -
Astrophys. J., 751, 99 (2012/June-1)
DASCH discovery of a possible nova-like outburst in a peculiar symbiotic binary.
TANG S., GRINDLAY J.E., MOE M., OROSZ J.A., KURUCZ R.L., QUINN S.N. and SERVILLAT M.
Abstract (from CDS):
We present photometric and spectroscopic observations of a peculiar variable (designated DASCH J075731.1+201735 or J0757) discovered from our DASCH project using the digitized Harvard College Observatory archival photographic plates. It brightened by about 1.5 mag in B within a year starting in 1942, and then slowly faded back to its pre-outburst brightness from 1943 to 1950s. The mean brightness level was stable before and after the outburst, and ellipsoidal variations with a period of P = 119.18±0.07 days are seen, suggesting that the star is tidally distorted. Radial-velocity measurements indicate that the orbit is nearly circular (e = 0.02±0.01) with a spectroscopic period that is the same as the photometric period. The binary consists of a 1.1 ±0.3 M☉M0III star, and a 0.6±0.2 M☉companion, very likely a white dwarf (WD). Unlike other symbiotic binaries, there is no sign of emission lines or a stellar wind in the spectra. With an outburst timescale of ∼10 years and estimated B-band peak luminosity MB∼ 0.7, J0757 is different from any other known classic or symbiotic novae. The most probable explanation of the outburst is hydrogen shell burning on the WD, although an accretion-powered flare cannot be ruled out.
Abstract Copyright:
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Journal keyword(s):
binaries: symbiotic - novae, cataclysmic variables
Nomenclature:
DASCH JHHMMSS.s+DDMMSS N=1 added.
Simbad objects:
9
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