The optical and radio counterpart of Circinus X-1 /3U 1516-56/

Details The optical and radio counterpart of Circinus X-1 /3U 1516-56/ The optical and radio counterpart of Circinus X-1 /3U 1516-56/

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..259w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 259-271.

Astronomy and Astrophysics

Astronomy

72

Radio Sources (Astronomy), Red Giant Stars, Stellar Radiation, X Ray Sources, Early Stars, Emission Spectra, H Alpha Line, Helium

Scientific paper

Circinus X-1 (3U1516-56) 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 H-alpha 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.

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