HEAO-1 observations of the X-ray pulsar 1E2259 + 586

Details HEAO-1 observations of the X-ray pulsar 1E2259 + 586 HEAO-1 observations of the X-ray pulsar 1E2259 + 586

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..268d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 268-274.

Astronomy and Astrophysics

Astronomy

17

Heao 1, Pulsars, Stellar Luminosity, X Ray Sources, Neutron Stars, Space Observations (From Earth), Star Formation, Stellar Evolution, Stellar Mass Accretion

Scientific paper

HEAO-1 scanning observations of the X-ray pulsar 1E2259 + 586 were analyzed, obtaining a pulse period from January 1978 of 6.978586 + or - 0.000006 sec. This extends the spindown trend seen by laser observers to earlier times. No evidence is found for a second derivative to the period. The luminosity and pulse profile derived are similar to those of subsequent observations, with no evidence for large-scale variability on a time scale of days or months. The paper discusses how the conventional picture of the source as an accreting neutron star can be modified to accommodate the very stable spin period derivative, and assesses various models for the pulsar's formation and subsequent evolution.

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