A 60 Second Periodic Modulation in Crab Pulsar Optical Light-Curve

Čadež, A.; Galicic, M.

doi:10.1017/s0252921100041750

Cited by 3 publications

(2 citation statements)

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“…The light entered the spectroscope through a frequency and phase controlled chopper. The device, described by Čadež & Galičič (1996), was used before on the same telescope to study the optical light curve of the pulsar. A blade allows light to enter the spectrograph for 10% of each pulse period.…”

Section: Observationsmentioning

confidence: 99%

Optical Spectrum of Main‐, Inter‐, and Off‐Pulse Emission from the Crab Pulsar

Carramiñana

Čadež

Zwitter

2000

ApJ

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A dedicated stroboscopic device was used to obtain optical spectra of the Crab main-pulse and inter-pulse as well as the spectrum of the underlying nebula when the pulsar is turned off. As 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 inter-pulse behave as power laws, both with the same de-reddened 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) and receding (∼ +600 km/s) components. The strength of emission line components and the flux in nebular continuum vary on arcsec scale. The nebular line and continuum intensities along the N-S slit are given.

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Section: Observationsmentioning

confidence: 99%

Optical Spectrum of Main‐, Inter‐, and Off‐Pulse Emission from the Crab Pulsar

Carramiñana

Čadež

Zwitter

2000

ApJ

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“…In this paper we present an improved version of the stroboscopic system, previously developed and used for observing faint optical signals from pulsars, specifically the signal from the Crab pulsar [1][2][3] . Pulsars are fast rotating neutron stars 4 .…”

Section: Introductionmentioning

confidence: 99%

Charge coupled device based phase resolved stroboscopic photometry of pulsars

Kotar

Vidrih

Čadež

2003

Review of Scientific Instruments

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A stroboscope designed to observe pulsars in the optical spectrum is presented. The absolute phase of the stroboscope is synchronized to better than 2.5 µs with the known radio ephemerides for a given pulsar. The absolute timing is provided by the GPS clock. With such a device phase resolved photometry of pulsars can be performed. We demonstrate the instrument's capabilities with the results of a set of observations of the Crab pulsar, the brightest of the known optical pulsars, with a visual magnitude of 16.5, and a rotational frequency of ∼ 29 Hz.

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