Spectroscopy of the Crab Pulsar

Details Spectroscopy of the Crab Pulsar Spectroscopy of the Crab Pulsar

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..584b&link_type=abstract

Astronomy and Astrophysics, v.374, p.584-587 (2001)

Astronomy and Astrophysics

Astrophysics

2

Stars: Pulsars: Individual (Crab Pulsar), Pulsars: General, Stars: Neutron

Scientific paper

We present new, high signal-to-noise spectroscopy of the Crab Pulsar in the range lambda lambda 5000-7000 Å. The observations were carried out with the 6-meter telescope of the SAO with the spectrograph SP-124 with a resolution of 2 Å. After reduction of the Crab Nebula emission, the dereddened pulsar spectrum can be fitted by a power law with alpha = -0.15+/- 0.15. There are no lines (emission and absorption) with a relative intensity (depth) of more than 2% (with a confidential probability of 99%). At this level we did not find absorption at lambda 6000 Å, possibly of ion-cyclotron origin, as detected by Nasuti et al. (\cite{nasuti}). This detail can be variable as a consequence of the variability of the ion ejection from the neutron star (NS) surface. We suggest a possible relationship between ejection intensity and inhomogeneity of the NS surface connected with pulsar glitches.

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