The probable binary nature of SS 433

Details The probable binary nature of SS 433 The probable binary nature of SS 433

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l.131c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Feb. 1, 1980, p. L131-L135.

Astronomy and Astrophysics

Astrophysics

95

Binary Stars, Emission Spectra, Stellar Spectra, X Ray Sources, H Alpha Line, H Beta Line, H Ii Regions, Radial Velocity, Stellar Luminosity

Scientific paper

From 52 spectroscopic observations on 31 nights with approximately 2 A resolution, radial-velocity measures in the 'stationary' line spectrum of SS 433 reveal a 13.1 day periodic variation, of amplitude K = 73 km/s. The effect is seen in the strongest emission peak of H alpha and H beta, and probably in the He I emission and absorption lines, and an absorption line of Fe II at 5169 A. From observations of stars in the nearby H II region S74, a lower limit of 2.3 kpc is estimated for the distance to SS 433.

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