The optical light curve of PSR1957+20

Details The optical light curve of PSR1957+20 The optical light curve of PSR1957+20

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240p..31c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 31P-34P.

Astronomy and Astrophysics

Astronomy

13

Light Curve, Pulsars, Stellar Evolution, Stellar Winds, Visible Spectrum, Black Body Radiation, Eclipsing Binary Stars, Light Modulation, Neutron Stars, X Ray Binaries

Scientific paper

New CCD photometry has been obtained of PSR1957+20, the eclipsing millisecond radio pulsar, which, when combined with earlier observations, show that the V light curve is repeatable on a time-scale of months, has an amplitude of greater than a factor of 25, and does not display the recently reported asymmetry of the r light curve. Combining the V and r light curves provides evidence that the optical modulation is due to a heating effect. The assumption of simple blackbody reradiation requires d = 1.4 kpc or less. It is found out that at least 20 percent of the flux from the neutron star impinging on the companion must be converted to optical radiation, for d = 450 pc or more.

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