The optical and radio counterpart of Circinus X-1 (3U 1516 - 56)
Open Access
- 1 November 1977
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 181 (2) , 259-271
- https://doi.org/10.1093/mnras/181.2.259
Abstract
Circinus X-l (3U 1516 – 56) has a radio counterpart which, at high frequencies, shows flares with the same 16.6-day periodicity as the X-ray intensity. In each cycle the radio flare occurs shortly after the intensity drop-off which defines the X-ray modulation. The radio source is positionally coincident with a faint red star having very strong Hα and weak He I emission lines which are probably variable. The object may be an early-type emission-line star or a symbiotic star, at a distance of 10 kpc.Keywords
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