UBVRI photometry of the pulsations in V2116 Ophiuchi ? GX1+4
- 21 August 1997
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 289 (4)
- https://doi.org/10.1093/mnras/289.4.L17
Abstract
The colours of pulsed and non-pulsed light in V2116 Oph have been measured with the UBVRI photometer of the LaboratÓrio Nacional de Astrofísica, in Brazil. The symbiotic binary was in an optical bright state with V ∼ 17. If the blue component in the spectrum of V2116 Oph follows the prescription for a standard optically thick accretion disc spectrum, its contribution to the light of the system at 6600 Å is ∼20 times the contribution of the red giant, with E(B − V) = 2.1 ± 0.1 mag and a distance of 8.3 kpc. The pulsed component is estimated to have Mv ∼ −1.7, implying characteristic sizes (for blackbody emission) of 1.4, 4.3 and 9.3 R⊙, for temperatures TBB = 100000, 20000 and 10 000 K, respectively.Keywords
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