Optical color, polarimetric, and timing measurements of the 50 MS Large Magellanic Cloud pulsar, PSR 0540-69

Details Optical color, polarimetric, and timing measurements of the 50 MS Large Magellanic Cloud pulsar, PSR 0540-69 Optical color, polarimetric, and timing measurements of the 50 MS Large Magellanic Cloud pulsar, PSR 0540-69

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..142m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 142-148. DOE-sponsored research.

Astronomy and Astrophysics

Astrophysics

55

Color, Magellanic Clouds, Polarimetry, Pulsars, Time Measurement, Linear Polarization, Magnetic Dipoles, Magnitude, Secular Variations, Ultraviolet Spectra

Scientific paper

The 50-ms LMC pulsar, PSR 0540-69, is similar to the Crab pulsar in its negative (U-B)0 color of -0.83(0.37) mag (error), but is marginally redder than the Crab from B through R, (B-R)0 = 0.57(0.30). The optical pulse of PSR 0540-69 averages less than 15 percent linear polarization when resolved at 0.05 cycles (= 2.5 ms). An epoch and frequency for PSR 0540-69 are derived over a four-night span. When combined with frequencies derived from past optical and X-ray observations, these frequencies imply a braking index of 3.6(0.8), where 3.0 corresponds to braking by pure magnetic dipole radiation, provided frequency glitches of order one part in 10 million or larger are unlikely to occur during a 6-month interval. The secular decrease of optical luminosity of the Crab pulsar as measured by Kristian (1978) is confirmed.

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