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Title:
The 17.1-h optical and X-ray orbital period of AC 211/X 2127 + 119 in M15
Authors:
Ilovaisky, S. A.; Auriere, M.; Koch-Miramond, L.; Chevalier, C.; Cordoni, J.-P.; Crowe, R. A.
Affiliation:
AA(Haute Provence, Observatoire, St.-Michel-l'Observatoire, France), AB(Observatoire Midi-Pyrenees, Bagneres-de-Bigorre, France), AC(CEA, Service d'Astrophysique, Gif-sur-Yvette, France), AD(Haute Provence, Observatoire, St.-Michel-l'Observatoire, France), AE(Montpellier II, Univ., France), AF(Hawaii Univ., Hilo)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 139-150. (A&A Homepage)
Publication Date:
03/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ORBITAL ELEMENTS, STELLAR ORBITS, VISIBLE SPECTRUM, X RAY BINARIES, GLOBULAR CLUSTERS, STELLAR MASS
Bibliographic Code:
1993A&A...270..139I

Abstract

An examination is conducted of over 500 CCD photometric measurements of AC 211, which is the optical counterpart of the globular cluster X-ray source X 2127 + 119. A phase-dispersion-minimization analysis of the ensemble of modulated and unmodulated nights shows the orbital period to be 17.112 hrs, which is double the previously accepted value. The central X-ray source is surrounded by an extended emission region that is partly eclipsed by the companion.

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