The optical 'bullets' of SS 433 as a radiative instability phenomenon.

Details The optical 'bullets' of SS 433 as a radiative instability phenomenon. The optical 'bullets' of SS 433 as a radiative instability phenomenon.

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296l..45b&link_type=abstract

Astronomy and Astrophysics, v.296, p.L45

Astronomy and Astrophysics

Astrophysics

3

Ss 433, Jets: Stellar, Instability: Radiative

Scientific paper

The fact that the transient 'bullet' phenomenon nd major variability seen in the optical spectrum of SS 433 are essentially absent in X-ray data from the 'inner' jets seems to preclude their being 'true' bullets - i.e. comprising intermittent large mass ejections. We propose instead that they are a radiative instability phenomenon occurring when minor variations in the jet filling factor (or other parameters such as jet mass loss rate or opening angle) take the jet through a critical threshold only below which can jet cooling to optical temperatures occur. At other times the jet remains hot until cooled solely by expansion, by which time the optical emission measure is small. The effect is analysed for the case where the jets are heated by interaction with the stellar wind from the companion star. The parameter criticality of this threshold could also help explain the rarity of detected SS 433s.

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