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Circularization in B-type Eclipsing Binaries in Both Magellanic Clouds

Published online by Cambridge University Press:  30 March 2016

P. North  and
J.-P. Zahn
P. North
Affiliation:
Laboratoire d’Astrophysique, EPFL, Observatoire, CH-1290 Chavannes-des-Bois, Switzerland
J.-P. Zahn
Affiliation:
LUTH, Observatoire de Paris-Meudon, F-92195 Meudon, France

Extract

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Making use of detached eclipsing binaries with B-type components discovered by the OGLE and MACHO teams in the SMC and in the LMC, we give the value of the fractional radius above which circularization occurs. This critical radius is around 0.24 to 0.26, regardless of the mass, surface gravity or metallicity, and is consistent with that found by Giuricin et al. (1984) for galactic binaries. These empirical facts are shown to be consistent with Zahn’s (1975) theory of tidal dissipation. This work confirms and extends that of North & Zahn (2003), thanks to a sample of 448 binaries taken from the recent OGLE catalogue of 2580 eclipsing binaries in the LMC (Wyrzykowski et al. 2003) and a more homogeneous interpretation of the lightcurves of the 148 SMC binaries.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 466
Copyright
Copyright © Astronomical Society of Pacific 2005

References

Giuricin, G., Mardirossian, F., & Mezetti, M. 1984, A&A, 134, 365 Google Scholar
North, P., & Zahn, J.-P. 2003, A&A, 405, 677 Google Scholar
Wyrzykowski, L., Udalski, A., Kubiak, M., et al. 2003, AcA, 53, 1 Google Scholar
Zahn, J.-P. 1975, A&A, 41, 329 Google Scholar