Discovery of a 7.68 second X-ray periodicity in 3U 1626-67

Details Discovery of a 7.68 second X-ray periodicity in 3U 1626-67 Discovery of a 7.68 second X-ray periodicity in 3U 1626-67

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l..29r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 1, 1977, p. L29-L33.

Astronomy and Astrophysics

Astronomy

53

Pulsars, Sas, X Ray Sources, Astronomical Spectroscopy, Pulse Duration, Spaceborne Astronomy

Scientific paper

SAS-3 observations of the X-ray source 3U 1626-67 have revealed the presence of a stable 7.68-sec pulse period. This source was selected for study because of its hard X-ray spectrum. The compilation of source spectra used in the selection process is also presented. Pulse arrival times are analyzed for effects of possible binary orbital motion. Upper limits to the projected orbital radius are obtained which tend to exclude orbital periods in the range from about 0.5 to 35 days. Binary systems with either a very long orbit (at least 175 days) or a very short orbit (no more than about 0.3 day) are most probable

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