Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.334..504k&link_type=abstract
Nature (ISSN 0028-0836), vol. 334, Aug. 11, 1988, p. 504-506. Research supported by the California Institute of Technology.
Astronomy and Astrophysics
Astronomy
23
Pulsars, Stellar Spectrophotometry, Stellar Winds, Visible Spectrum, Charge Coupled Devices, Stellar Color, Stellar Magnitude, Very Large Array (Vla)
Scientific paper
The detection by optical observation of a probably variable object (star X) with a mean apparent V magnitude of about 20 is reported within the astrometric error circle of the equatorial radio position of the eclipsing, millisecond pulsar 1957 + 20. Star X appears fainter at orbital phase 0.21, the onset of the pulsar eclipse, compared with the quadrature position, suggesting that it is probably the optical counterpart. It is argued that the secondary heated by the pulsar wind and not the pulsar itself makes the dominant contribution to the visible radiation from this system. The absolute magnitude of star X is roughly 10.5, assuming a distance of about 0.8 kpc derived from the dispersion measure. The optical luminosity of the counterpart directly measures the fraction of the pulsar wind power responsible for heating the secondary.
Djorgovski Stanislav
Fruchter Andrew S.
Kulkarni Sanjeev R.
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