The possible X ray triple 4U2129+47 (=V1727 Cygni)

Details The possible X ray triple 4U2129+47 (=V1727 Cygni) The possible X ray triple 4U2129+47 (=V1727 Cygni)

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..151g&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 151-156 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

1

Radial Velocity, Stellar Mass, Stellar Orbits, Triple Stars, X Ray Binaries, Spectroscopic Analysis, Stellar Spectra, Stellar Spectrophotometry, Time Measurement

Scientific paper

The evidence which indicates that the Low-Mass-X-Ray-Binary (LMXRB) 4U2129+47 is a triple system is discussed. This evidence includes the lack of large radial velocity variations, lack of photometric variations, and spectral type observed in the current off state. The detection of a small shift in the systemic radial velocity measured at one epoch relative to the measurements at three other epochs is considered. This shift is interpreted as orbital motion of the observed F7V star around the inner LMXRB. The radial velocity of this system is measured. The evidence that 4U2129+47 is actually a triple system is reviewed. Measurements of the radial velocity of the system with recent (July 89) data are discussed.

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