Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..893l&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 15, 1979, p. 893-897.
Astronomy and Astrophysics
Astrophysics
43
Binary Stars, Periodic Variations, Pulsars, X Ray Sources, Mass Transfer, Neutron Stars, Orbital Position Estimation, Stellar Luminosity, Time Measurement
Scientific paper
The hard, pulsing, transient X-ray source A0535+26 has been observed with SAS 3 on three occasions during 1977-1978. These observations have yielded a precise position measurement (20 arcsec error radius), which renders the identification of A0535+26 with the Be star HDE 245770 virtually certain. The pulse phase was tracked for about 9 days in April 1978 and clearly showed both first and second derivatives in the pulse period. An analysis of these timing data, combined with data from previous observations, leads to the following conclusions: (1) a significant fraction of the observed changes in pulse period is probably intrinsic to the compact X-ray star (e.g., accretion torques on a neutron star), and (2) conservative limits on binary orbital parameters tend to further confirm a long orbital period (at least about 20 days).
Clark George W.
Jernigan Garret J.
Li Fucai
Rappaport Saul
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