Discovery of 5.16 s pulsations from the isolated neutron star RBS 1223

V. Hambaryan; G. Hasinger; A. D. Schwope; N. S. Schulz

doi:10.1051/0004-6361:20011425

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Volume 381 / No 1 (JanuaryI 2002)

A&A, 381 1 (2002) 98-104

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Issue		A&A Volume 381, Number 1, JanuaryI 2002


Page(s)		98 - 104
Section		Interstellar and circumstellar matter
DOI		https://doi.org/10.1051/0004-6361:20011425
Published online		15 January 2002

A&A 381, 98-104 (2002)

Discovery of 5.16 s pulsations from the isolated neutron star RBS 1223

V. Hambaryan¹, G. Hasinger¹, A. D. Schwope¹ and N. S. Schulz²

¹ Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
² Massachusetts Institute of Technology, Center for Space Research, 70 Vassar Street, Cambridge, MA 02139, USA

Corresponding author: V. Hambaryan, vhambaryan@aip.de

Received: 11 May 2001
Accepted: 4 October 2001

Abstract

The isolated neutron star candidate RBS 1223 was observed with the Advanced CCD Imaging Spectrometer aboard the Chandra observatory on 2000 June 24. A timing analysis of the data yielded a periodic modulation with a period $P=5.1571696^{+1.57\times 10^{-4}}_{-1.36\times 10^{-4}}$ s. Using ROSAT HRI archived observations we detected a period $P=5.1561274\pm 4.4\times 10^{-4}$ s and determined period derivative $\dot{P}=(0.7 {-} 2.0)\times 10^{-11}$ s ${\rm s^{-1}}$ . The detection of this period and $\dot{P}$ indicates that RBS 1223 has a “characteristic” age of 6000-12 000 years and huge magnetic field at the surface ( $B_{\rm dipole} \approx (1.7{-} 3.2) \times 10^{+14} {\rm G}$ ) typical for anomalous pulsars (AXPs).

Key words: stars: neutron / stars: individual: RBS1223 / X-rays: stars

© ESO, 2002

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