Possible evidence for disk emission in SS 433

Details Possible evidence for disk emission in SS 433 Possible evidence for disk emission in SS 433

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..242f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, July 1988, p. 242-250. Research supported by the University of California.

Astronomy and Astrophysics

Astronomy

26

Accretion Disks, Binary Stars, Doppler Effect, Emission Spectra, Stellar Mass, Stellar Models, Infrared Spectra, Near Infrared Radiation, Paschen Series, Signal To Noise Ratios, Visible Spectrum

Scientific paper

Optical and N/R spectra of SS 433 having moderate resolution (2-4 A) and exceptionally high signal-to-noise ratios (100/1 to 200/1), obtained a few days prior to the crossover time of the moving-line systems are presented. The strong Paschen lines of the stationary (rest wavelength) system exhibit a remarkable double-peaked structure (Delta v about 290 km/s), suggestive of emission from a rotating disklike region. Several unblended Fe II lines also consist of double peaks centered on the systemic velocity. Both the Paschen and the Balmer stationary-line profiles show substantial variation over the three nights spanning the observations. Interesting changes are also seen in the moving-line system; in particular, emission is detected from several members of the Paschen series. If the proposed identification of the disk emission is confirmed, detailed observations would probe the accretion disk structure and provide estimates of the mass of each component in the system.

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