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Title:
The Spectrum of the Large Magellanic Cloud Pulsar B0540-69
Authors:
Hill, Robert J.; Dolan, Joseph F.; Bless, Robert C.; Boyd, Patricia T.; Percival, Jeffrey W.; Taylor, M. J.; van Citters, G. W.
Publication:
Astrophysical Journal Letters v.486, p.L99 (ApJ Homepage)
Publication Date:
09/1997
Origin:
APJ
ApJ Keywords:
STARS: PULSARS: INDIVIDUAL ALPHANUMERIC: B0540-69, ULTRAVIOLET: STARS
DOI:
10.1086/310858
Bibliographic Code:
1997ApJ...486L..99H

Abstract

A prism spectrum of PSR B0540-69, the 50 ms pulsar in the Large Magellanic Cloud, was obtained with the Faint Object Spectrograph on the Hubble Space Telescope. This is only the second pulsar spectrum that has been observed in the optical. The 2500--5500 A spectrum shows a smooth continuum with several broad emission lines. The lines are emitted by the extended nebula surrounding B0540-69. Less than 30% of the total flux in the spectrum can be contributed by the synchrotron nebula surrounding the pulsar; the time-averaged emission from the pulsar must be the dominant source of the continuum. The observed spectral index, alpha , of the continuum, where flux density S nu = K nu alpha mu Jy, is -2.5 +/- 0.2 between 2500 and 4500 A . Using E(B - V) = 0.20 +/- 0.05 gives a de-extincted spectral index alpha 0 = -1.6 +/- 0.4. This intrinsic spectral index is significantly different from that of the Crab pulsar in the optical alpha 0 = 0.11 +/- 0.13. Unless E(B - V) ~ 0.5, the intrinsic spectral index of time-averaged pulsar radiation must vary as much from pulsar to pulsar in the high-frequency regime as it does in the radio.
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