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Search for redshifted 2.2 MeV neutron capture line from A0535+262 in outburst

Çalışkan, Şirin and Kalemci, Emrah and Baring, Matthew G. and Boggs, Steven E. and Kretschmar, Peter (2009) Search for redshifted 2.2 MeV neutron capture line from A0535+262 in outburst. The Astrophysical Journal, 694 (1). pp. 593-598. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/0004-637X/694/1/593

Abstract

The Be/X-ray binary system A0535+262 underwent a giant outburst in 2005 May-June, followed by a dimmer outburst in 2005 August-September. This increased intensity provided an opportunity to search for redshifted neutron capture lines from the surface of the neutron star. If discovered, such lines would constrain the neutron star equation of state, providing the motivation of this search. The spectrometer (SPI) on board the INTEGRAL satellite observed the dimmer outburst and provided the data for this research. We have not detected a line with enough significance, with the width-dependent upper limits on the broadened and redshifted neutron capture line in the range of (2 – 11) × 10−4 photons cm−2 s−1. To our knowledge, these are the strongest upper limits on the redshifted 2.2 MeV emission from an accreting neutron star. Our analysis of the transparency of the neutron star surface for 2.2 MeV photons shows that photons have a small but finite chance of leaving the atmosphere unscattered, which diminishes the possibility of detection.

Item Type:Article
Uncontrolled Keywords:nuclear reactions, nucleosynthesis, abundances; stars: individual (A0535+262); stars: neutron; X-rays: binaries
Subjects:Q Science > QB Astronomy > QB460-466 Astrophysics
Q Science > QC Physics > QC1 General
ID Code:11879
Deposited By:Emrah Kalemci
Deposited On:08 Sep 2009 09:32
Last Modified:25 May 2011 14:20

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