Mass/radius constraints on the quiescent neutron star in M13 using hydrogen and helium atmospheres
Mass/radius constraints on the quiescent neutron star in M13 using hydrogen and helium atmospheres
The mass and radius of the neutron star (NS) in low-mass X-ray binaries can be obtained by fitting the X-ray spectrum of the NS in quiescence, and the mass and radius constrains the properties of dense matter in NS cores. A critical ingredient for spectral fits is the composition of the NS atmosphere: hydrogen atmospheres are assumed in most prior work, but helium atmospheres are possible if the donor star is a helium white dwarf. Here we perform spectral fits to XMM-Newton, Chandra, and ROSAT data of a quiescent NS in the globular cluster M13. This NS has the smallest inferred radius from previous spectral fitting. Assuming an atmosphere composed of hydrogen, we find a significantly larger radius, more consistent with those from other quiescent NSs. With a helium atmosphere (an equally acceptable fit), we find even larger values for the radius.
145-[6pp]
Catuneanu, Andrei
894ac407-c0d6-460f-9fd8-7e5dc185e168
Heinke, Craig O.
d7382ed2-cb85-4e15-b2d9-296fc8b6221d
Sivakoff, Gregory R.
e725b4eb-7437-46ca-9f6e-e56847938736
Ho, Wynn C.G.
d78d4c52-8f92-4846-876f-e04a8f803a45
Servillat, Mathieu
78700dd4-70a4-4a50-afd5-199db816f58a
1 February 2013
Catuneanu, Andrei
894ac407-c0d6-460f-9fd8-7e5dc185e168
Heinke, Craig O.
d7382ed2-cb85-4e15-b2d9-296fc8b6221d
Sivakoff, Gregory R.
e725b4eb-7437-46ca-9f6e-e56847938736
Ho, Wynn C.G.
d78d4c52-8f92-4846-876f-e04a8f803a45
Servillat, Mathieu
78700dd4-70a4-4a50-afd5-199db816f58a
Catuneanu, Andrei, Heinke, Craig O., Sivakoff, Gregory R., Ho, Wynn C.G. and Servillat, Mathieu
(2013)
Mass/radius constraints on the quiescent neutron star in M13 using hydrogen and helium atmospheres.
Astrophysical Journal, 764 (2), .
(doi:10.1088/0004-637X/764/2/145).
Abstract
The mass and radius of the neutron star (NS) in low-mass X-ray binaries can be obtained by fitting the X-ray spectrum of the NS in quiescence, and the mass and radius constrains the properties of dense matter in NS cores. A critical ingredient for spectral fits is the composition of the NS atmosphere: hydrogen atmospheres are assumed in most prior work, but helium atmospheres are possible if the donor star is a helium white dwarf. Here we perform spectral fits to XMM-Newton, Chandra, and ROSAT data of a quiescent NS in the globular cluster M13. This NS has the smallest inferred radius from previous spectral fitting. Assuming an atmosphere composed of hydrogen, we find a significantly larger radius, more consistent with those from other quiescent NSs. With a helium atmosphere (an equally acceptable fit), we find even larger values for the radius.
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Published date: 1 February 2013
Organisations:
Applied Mathematics
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Local EPrints ID: 347896
URI: http://eprints.soton.ac.uk/id/eprint/347896
ISSN: 0004-637X
PURE UUID: 7c87d2ec-9bf7-4e61-8510-15b3c9df4807
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Date deposited: 04 Feb 2013 16:18
Last modified: 14 Mar 2024 12:53
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Author:
Andrei Catuneanu
Author:
Craig O. Heinke
Author:
Gregory R. Sivakoff
Author:
Mathieu Servillat
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