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Detection of Spectroscopic Triples

Published online by Cambridge University Press:  12 April 2016

Tsevi Mazeh ,
Yuval Krymolowski  and
David W. Latham
Tsevi Mazeh
Affiliation:
School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
Yuval Krymolowski
Affiliation:
School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
David W. Latham
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA

Extract

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Several binary stars detected by the Center for Astrophysics (CfA) radial-velocity surveys were found to be members of triple systems. We present two examples, each requires a different analysis to discover its multiplicity.

One example is G176-46, a double-lined halo star of the Carney & Latham (1987) high proper-motion survey. The secondary star (G176-46b) displays large radial velocity variations, in contrast with the primary (G176-46a), which is constant within the error limits. Figure 1 shows two cross correlations of the stellar spectra against the same calculated template taken at different times, which indicate that only the secondary’s peak changes its position. A similar variation was observed previously for ADS 8811 (Mazeh & Latham 1988).

We have found the secondary radial velocity to vary with a period of 10.44 days, and therefore conclude that Gl76-46b is a member of a short-period binary system. The orbital solution has an amplitude of 38 km s−1 and eccentricity of 0.05.

Type
Spectroscopic Studies
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 161 - 163
Copyright
Copyright © Astronomical Society of the Pacific 1992

References

Carney, B. & Latham, D.W. 1987, AJ, 93, 116 Google Scholar
Latham, D.W., Mazeh, T., Stefanik, R.P., Davis, R.J., Carney, B.W., Krymolowski, Y., Laird, J.B., Torres, G., & Morse, J.A. 1992, AJ submittedGoogle Scholar
Maseh, T. 1990, AJ 99, 675 Google Scholar
Maseh, T. & Latham, D.W. 1988, Ap&SS, 142, 131 Google Scholar