The unique spectrum of SS 433, a star inside a supernova remnant

Details The unique spectrum of SS 433, a star inside a supernova remnant The unique spectrum of SS 433, a star inside a supernova remnant

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....85...14m&link_type=abstract

Astronomy and Astrophysics, vol. 85, no. 1-2, May 1980, p. 14-19. Research supported by the Consiglio Nazionale delle Ricerche.

Astronomy and Astrophysics

Astronomy

20

Radio Sources (Astronomy), Stellar Evolution, Stellar Spectra, Supernova Remnants, X Ray Sources, Neutron Stars, Nonthermal Radiation, Stellar Motions

Scientific paper

The optical counterpart (SS 433) of an X-ray and nonthermal radio source (A19.09+04) has revealed a very unusual spectrum. It is characterized by broad hydrogen, He I and He II emissions (all with PCyg-like profiles) and by structured O I 8446 A, this latter emitted mainly through Lyman beta fluorescence. The radial velocity of the source is small, very likely denoting a galactic object. The most unusual phenomenon is represented by red and infrared emission bands, changing their position with a shift of several hundred A. It occurs in a sinusoidal way with period of about 168 d. The strongest bands are very likely H alpha and He I satellites, which, if interpreted as Doppler shifted, indicate velocities up to 0.18c. A neutron star in a massive binary system is to be preferred to a magnetized white dwarf, because of evolutionary and physical considerations. The model of two stream with relativistic velocity from/to this star, with precessional motion of their axis, is found to agree with the observations. The object appears inside a radio SNR, at about 3 kpc, which was ejected abut 50,000 yr ago.

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