The 17.1-h optical and X-ray orbital period of AC 211/X 2127 + 119 in M15

Details The 17.1-h optical and X-ray orbital period of AC 211/X 2127 + 119 in M15 The 17.1-h optical and X-ray orbital period of AC 211/X 2127 + 119 in M15

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..139i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 139-150.

Astronomy and Astrophysics

Astrophysics

46

Orbital Elements, Stellar Orbits, Visible Spectrum, X Ray Binaries, Globular Clusters, Stellar Mass

Scientific paper

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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