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NuSTAR Observation of a Type I X-Ray Burst from GRS 1741.9-2853

Barrière, Nicolas M. and Krivonos, Roman and Tomsick, John A. and Bachetti, Matteo and Boggs, Steven E. and Chakrabarty, Deepto and Christensen, Finn E. and Craig, William W. and Hailey, Charles J. and Harrison, Fiona A. and Hong, Jaesub and Mori, Kaya and Stern, Daniel and Zhang, William W. (2015) NuSTAR Observation of a Type I X-Ray Burst from GRS 1741.9-2853. Astrophysical Journal, 799 (2). Art. No. 123. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20150306-124238863

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Abstract

We report on two NuSTAR observations of GRS 1741.9-2853, a faint neutron star (NS) low-mass X-ray binary burster located 10' away from the Galactic center. NuSTAR detected the source serendipitously as it was emerging from quiescence: its luminosity was 6 × 10^(34) erg s^(–1) on 2013 July 31 and 5 × 10^(35) erg s^(–1) in a second observation on 2013 August 3. A bright, 800 s long, H-triggered mixed H/He thermonuclear Type I burst with mild photospheric radius expansion (PRE) was present during the second observation. Assuming that the luminosity during the PRE was at the Eddington level, an H mass fraction X = 0.7 in the atmosphere, and an NS mass M = 1.4 M_☉, we determine a new lower limit on the distance for this source of 6.3 ± 0.5 kpc. Combining with previous upper limits, this places GRS 1741.9-2853 at a distance of 7 kpc. Energy independent (achromatic) variability is observed during the cooling of the NS, which could result from the disturbance of the inner accretion disk by the burst. The large dynamic range of this burst reveals a long power-law decay tail. We also detect, at a 95.6% confidence level (1.7σ), a narrow absorption line at 5.46 ± 0.10 keV during the PRE phase of the burst, reminiscent of the detection by Waki et al. We propose that the line, if real, is formed in the wind above the photosphere of the NS by a resonant Kα transition from H-like Cr gravitationally redshifted by a factor 1 + z = 1.09, corresponding to a radius range of 29.0-41.4 km for a mass range of 1.4-2.0 M_☉.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/799/2/123DOIArticle
http://iopscience.iop.org/0004-637X/799/2/123PublisherArticle
http://arxiv.org/abs/1411.4745arXivDiscussion Paper
ORCID:
AuthorORCID
Krivonos, Roman0000-0003-2737-5673
Bachetti, Matteo0000-0002-4576-9337
Boggs, Steven E.0000-0001-9567-4224
Harrison, Fiona A.0000-0003-2992-8024
Mori, Kaya0000-0002-9709-5389
Stern, Daniel0000-0003-2686-9241
Additional Information:© 2015 American Astronomical Society. Received 2014 May 20; accepted 2014 November 21; published 2015 January 21. This work was supported under NASA contract No. NNG08FD60C, and made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). The authors thank Nevin Weinberg for useful discussions, and the anonymous referee for constructive comments. Facility: NuSTAR
Group:NuSTAR, Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANNG08FD60C
NASA/Caltech/JPLUNSPECIFIED
Subject Keywords:accretion, accretion disks; nuclear reactions, nucleosynthesis, abundances; stars: neutron; X-rays: binaries; X-rays: bursts; X-rays: individual (GRS 1741.9-2853)
Record Number:CaltechAUTHORS:20150306-124238863
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150306-124238863
Official Citation:NuSTAR Observation of a Type I X-Ray Burst from GRS 1741.9-2853 Nicolas M. Barrière et al. 2015 ApJ 799 123
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55605
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Mar 2015 22:00
Last Modified:10 Oct 2017 20:51

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