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The nature of the X-ray transient MAXI J0556−332

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Cornelisse, R., D'Avanzo, P., Campana, S., Casares, J., Charles, P. A., Israel, G. L., Muñoz-Darias, T., O'Brien, K., Steeghs, D., Stella, L. 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

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2011.20274.x

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

Official Date:

March 2012

Dates:

Date	Event
March 2012	Published

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), 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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