Evidence for an 11.2 day periodicity from Cygnus X-2

Details Evidence for an 11.2 day periodicity from Cygnus X-2 Evidence for an 11.2 day periodicity from Cygnus X-2

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205l.143h&link_type=abstract

Astrophysical Journal, vol. 205, May 1, 1976, pt. 2, p. L143-L145.

Other

15

Binary Stars, Periodic Variations, X Ray Sources, Luminous Intensity, Modulation, Stellar Luminosity, Stellar Mass

Scientific paper

Evidence is reported for a periodicity of 11.17 (+ or - 0.10) days in the emission from Cygnus X-2. The data were obtained quasi-continuously over a period of more than one year with the Ariel-5 All-Sky Monitor. It is noted that this period is more than an order of magnitude larger than the 0.787-day binary period of Sco X-1 and is not a simple alias of a similarly short period. It is suggested that the 11.17-day modulation might be precessionally induced; otherwise, it would be rather unusual since the Cyg X-2 candidate is assumed to have a low-mass primary and periods in excess of about 2 days are usually associated with high-mass primaries.

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