A 6.5-day periodicity in the recurrent nova V404 Cygni implying the presence of a black hole

Details A 6.5-day periodicity in the recurrent nova V404 Cygni implying the presence of a black hole A 6.5-day periodicity in the recurrent nova V404 Cygni implying the presence of a black hole

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..614c&link_type=abstract

Nature (ISSN 0028-0836), vol. 355, Feb. 13, 1992, p. 614-617.

Astronomy and Astrophysics

Astronomy

153

Black Holes (Astronomy), Novae, X Ray Binaries, Ephemerides, Satellite Observation, Stellar Spectrophotometry

Scientific paper

Two years after its outburst in 1989, the William Herschel Telescope has been used to find absorption features in V404 Cyg characteristic of a late G or early K star with a radial velocity curve of amplitude 211 +/- 4 km/s and period 6.473 +/- 0.001 days. The deduced mass function of 6.26 +/- 0.31 solar masses is a firm lower limit to the mass of the compact object, which for reasonable assumptions of orbital inclination and companion star mass must be a black hole with probable mass in the range 8-15.5 solar masses.

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