Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..248s&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 248-254.
Astronomy and Astrophysics
Astrophysics
6
Binary Stars, Linear Polarization, Pulsars, X Ray Sources, Expos (Spacelab Payload), Light Curve, Oso-8, Satellite-Borne Instruments, Stellar Mass Accretion
Scientific paper
The first search for X-ray polarization in the Cen X-3 and Her X-1 pulsars was performed by the OSO 8 polarimeters in 1975 July and 1975 August, respectively. Three-sigma upper limits to the polarization in Cen X-3 of 13.5% and 19% at 2.6 keV and 5.2 keV, respectively, were obtained when the data were averaged over the pulse and binary periods. The upper limit for Her X-1 at 2.6 keV is 60%. A search for pulse-phase dependent X-ray polarization from both objects was also performed. At the 91% confidence level, emission from Cen X-3 exhibits evidence for X-ray polarization at 2.6 keV that varies with pulse phase. Upper limits to polarization are presented for the leading and trailing edges and peak of the Her X-1 pulse at 2.6 keV.
Kestenbaum H. L.
Long Knox S.
Novick Robert
Silver Eric H.
Weisskopf Martin C.
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