Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335l..61d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. L61-L65. Research supported by California
Astronomy and Astrophysics
Astrophysics
34
Astronomical Photometry, Companion Stars, Eclipsing Binary Stars, Light Curve, Pulsars, Flux Quantization, Stellar Color, Stellar Magnitude, Variable Stars
Scientific paper
The authors confirm the discovery of the optical counterpart to the eclipsing millisecond pulsar 1957+20 recently reported by Fruchter, Stinebring, and Taylor. A nearly complete light curve derived from 58 CCD images taken in the Gunn r band has been obtained and found to match the 9.17 hr orbital period of the pulsar. A detailed analysis of these data is presented. Assuming the distance 0.9 kpc derived from the radio dispersion measure, and an extinction of AV = 1 mag, the authors derive an effective temperature of 5800K, an aboslute visual magnitude of the pulsar companion of 10.5 and its radius to be ≅0.16 R_sun;, close to that of a degenerate hydrogen dwarf.
Djorgovski Stanislav
Evans Charles R.
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