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Periods Ranging From 5 to 1500 Days in the Anticorrelated Moving Lines of SS 433*

Published online by Cambridge University Press:  12 April 2016

S. Frasca ,
F. Ciatti  and
A. Mammano
S. Frasca
Affiliation:
Department of Physics, University of Rome
F. Ciatti
Affiliation:
Asiago Astrophysical Observatory, University of Padova
A. Mammano
Affiliation:
Asiago Astrophysical Observatory, University of Padova

Abstract

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Some tens of harmonic components are found in the moving lines of SS 433, leaving a standard deviation of 0.002 in Z units, that is comparable to the observational error.

Ten harmonics appear anticorrelated in the two branches, among which those at 80,155, and 1500 days are also strong. Their behaviour indicates changing structure in the ejecting mechanism.

No secular change is occurring in the precessional 163-day period beyond the estimated error of 5 x 10-5 d-1. No periodicity occurs in beam velocity. One quarter of cases of (Z1 + Z2) are found outside their mean value by more than 5σ. This implies either variable beam velocity or absence of strict anti-parallelism.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 80: Double Stars, Physical Properties and Generic Relations , 1984 , pp. 329 - 333
Copyright
Copyright © Reidel 1984

Footnotes

**

Also at Department of Mathematics, University of Messina.

*

Paper presented at the Lembang-Bamberg IAU Colloquium No. 80 on ‘Double Stars: Physical Properties and Generic Relations', held at Bandung, Indonesia, 3-7 June, 1983.

References

Ciatti, F., Mammario, A., and Vittone, A.: 1981, Astron. Astrophys. 94, 251.Google Scholar
Ciatti, F., Mammario, A., Iijima, T., and Vittone, A.: 1983, Astron. Astrophys. Suppl. Ser. 52, 443.Google Scholar
Cogotti, R., Doo Jong, S., and Ruffini, R.: 1983, preprint.Google Scholar
Milgrom, M.: 1980, Astron. Astrophys. 87, L15.Google Scholar