Cornelisse, R., D'Avanzo, P., Campana, S., Casares, J., Charles, P. A., Israel, G. L., Muñoz-Darias, T., O'Brien, K., Steeghs, D. (Danny), 1972-, Stella, L. (Luigi), 1957- and Torres, M. A. P.. (2012) The nature of the X-ray transient MAXI J0556−332. Monthly Notices of the Royal Astronomical Society, Vol.420 (No.4). pp. 3538-3544. ISSN 0035-8711

Text WRAP_Steeghs_Maxi_1111.6946v1.pdf - Accepted Version Restricted to Repository staff only until 26 July 2012. Download (366Kb)

Abstract

Phase-resolved spectroscopy of the newly discovered X-ray transient MAXIJ0556-332 has revealed the presence of narrow emission lines in the Bowen region that most likely arise on the surface of the mass donor star in this low-mass X-ray binary. A period search of the radial velocities of these lines provides two candidate orbital periods (16.43 ± 0.12 and 9.754 ± 0.048h), which differ from any potential X-ray periods reported. Assuming that MAXIJ0556-332 is a relatively high-inclination system that harbours a precessing accretion disc in order to explain its X-ray properties, it is only possible to obtain a consistent set of system parameters for the longer period. These assumptions imply a mass ratio of q≃ 0.45, a radial velocity semi-amplitude of the secondary of K 2≃ 190kms -1 and a compact object mass of the order of the canonical neutron star mass, making a black hole nature for MAXIJ0556-332 unlikely. We also report the presence of strong Niii emission lines in the spectrum, thereby inferring a high N/O abundance. Finally, we note that the strength of all emission lines shows a continuing decay over the ≃1 month of our observations.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray bursts, Double stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley
ISSN:	0035-8711
Date:	March 2012
Volume:	Vol.420
Number:	No.4
Page Range:	pp. 3538-3544
Identification Number:	10.1111/j.1365-2966.2011.20274.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Spain. Ministerio de Educación y Ciencia (MEC), European Commission (EC), Spain. Ministerio de Ciencia e Innovación (MICINN), Seventh Framework Programme (European Commission) (FP7/2007-2013), Science and Technology Facilities Council (Great Britain) (STFC)
Grant number:	RYC-2007-01046 (MEC), PERG04-GA- 2008-239142 (EC), AYA 2010-18080 (MICINN), CSD 2006-00070 (MICINN), ITN 215212 (FP7)
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URI:	http://wrap.warwick.ac.uk/id/eprint/44913

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