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Browsing by Author "Nättilä J."

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Basic parameters of the helium-accreting X-ray bursting neutron star in 4U 1820-30

Suleimanov V.; Kajava J.; Molkov S.; Nättilä J.; Lutovinov A.; Werner K.; Poutanen J. (2017)

© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. The ultracompact low-mass X-ray binary 4U 1820-30 situated in the globular cluster NGC 6624 has an orbital period of only ...
Equation of state constraints for the cold dense matter inside neutron stars using the cooling tail method

Nättilä J.; Steiner A.; Kajava J.; Suleimanov V.; Poutanen J. (2016)

© ESO, 2016.The cooling phase of thermonuclear (type-I) X-ray bursts can be used to constrain neutron star (NS) compactness by comparing the observed cooling tracks of bursts to accurate theoretical atmosphere model ...
Evidence for the Photoionization Absorption Edge in a Photospheric Radius Expansion X-Ray Burst from GRS 1747-312 in Terzan 6

Li Z.; Suleimanov V.; Poutanen J.; Salmi T.; Falanga M.; Nättilä J.; Xu R. (2018)

© 2018. The American Astronomical Society. All rights reserved. Thermonuclear X-ray bursts on the surface of neutron stars (NSs) can enrich the photosphere with metals, which may imprint photoionization edges on the burst ...
Magnetospheric return-current-heated atmospheres of rotation-powered millisecond pulsars

Salmi T.; Suleimanov V.F.; Nättilä J.; Poutanen J. (2020)

© 2020 ESO. We computed accurate atmosphere models of rotation-powered millisecond pulsars in which the polar caps of a neutron star (NS) are externally heated by magnetospheric return currents. The external ram pressure, ...
Models of neutron star atmospheres enriched with nuclear burning ashes

Nättilä J.; Suleimanov V.; Kajava J.; Poutanen J. (2015)

© ESO, 2015. Context. Low-mass X-ray binaries hosting neutron stars (NS) exhibit thermonuclear (type-I) X-ray bursts, which are powered by unstable nuclear burning of helium and/or hydrogen into heavier elements deep in ...
Neutron star mass and radius measurements from atmospheric model fits to X-ray burst cooling tail spectra

Nättilä J.; Miller M.; Steiner A.; Kajava J.; Suleimanov V.; Poutanen J. (2017)

© ESO, 2017. Observations of thermonuclear X-ray bursts from accreting neutron stars (NSs) in low-mass X-ray binary systems can be used to constrain NS masses and radii. Most previous work of this type has set these ...
The direct cooling tail method for X-ray burst analysis to constrain neutron star masses and radii

Suleimanov V.; Poutanen J.; Nättilä J.; Kajava J.; Revnivtsev M.; Werner K. (2017)

© 2016 The Authors.Determining neutron star (NS) radii and masses can help to understand the properties of matter at supra-nuclear densities. Thermal emission during thermonuclear X-ray bursts from NSs in low-mass X-ray ...
The effect of accretion on the measurement of neutron star mass and radius in the low-mass X-ray binary 4U 1608-52

Poutanen J.; Nättilä J.; Kajava J.; Latvala O.; Galloway D.; Kuulkers E.; Suleimanov V. (2014)

Spectral measurements of thermonuclear (type I) X-ray bursts from low-mass X-ray binaries have been used to measure neutron star (NS) masses and radii. A number of systematic issues affect such measurements and have raised ...
The influence of accretion geometry on the spectral evolution during thermonuclear (type I) X-ray bursts

Kajava J.; Nättilä J.; Latvala O.; Pursiainen M.; Poutanen J.; Suleimanov V.; Revnivtsev M.; Kuulkers E.; Galloway D. (2014)

© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Neutron star (NS)masses and radii can be estimated from observations of photospheric radiusexpansion X-ray bursts, provided ...

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Browsing by Author "Nättilä J."

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