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Title:
Optical Spectrum of Main-, Inter-, and Off-Pulse Emission from the Crab Pulsar
Authors:
Carramiñana, Alberto; Čadež, Andrej; Zwitter, Tomaž
Affiliation:
AA(Instituto Nacional de Astrofisica, Optica y Electronica, Luis Enrique Erro 1, Tonantzintla, Puebla, 72840, México), AB(Department of Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia), AC(Department of Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia)
Publication:
The Astrophysical Journal, Volume 542, Issue 2, pp. 974-977. (ApJ Homepage)
Publication Date:
10/2000
Origin:
UCP
ApJ Keywords:
Stars: Pulsars: Individual: Alphanumeric: PSR B0531+21, Stars: Neutron, ISM: Supernova Remnants, Techniques: Spectroscopic
DOI:
10.1086/317063
Bibliographic Code:
2000ApJ...542..974C

Abstract

A dedicated stroboscopic device was used to obtain optical spectra of the Crab pulsar main pulse and interpulse as well as the spectrum of the underlying nebula when the pulsar is turned off. Since the nebular emission is very inhomogeneous, our ability to effectively subtract the nebular background signal is crucial. No spectral lines intrinsic to the pulsar are detected. The main pulse and the interpulse behave as power laws, both with the same dereddened index α=+0.2+/-0.1. This value was obtained by subtracting the nebular spectrum at the exact position of the pulsar. The underlying nebula is redder, α=-0.4+/-0.1. Its emission lines are split into approaching (~-1200 km s-1) and receding (~+600 km s-1) components. The strength of the emission line components and the flux in the nebular continuum vary on an arcsecond scale. The nebular line and continuum intensities along the north-south slit are given.
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