Spectroscopy of the Crab Pulsar

¹ Special Astrophysical Observatory, Nizhnij Arkhyz, Karachaevo-Cherkesia, 369167, Russia
² Isaac Newton Institute of Chile, SAO Branch, Chile
³ Department of Astronomy and Mechanics, Udmurt State University, 1, Universitetskaia, Izhevsk, 426034, Russia e-mail: benj@uni.udm.ru

Corresponding author: G. Beskin, beskin@sao.ru

Received: 5 April 2001
Accepted: 7 May 2001

Abstract

We present new, high signal-to-noise spectroscopy of the Crab Pulsar in the range 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 . 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 Å, possibly of ion-cyclotron origin, as detected by Nasuti et al. ([CITE]). 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.