The effect of diffusive nuclear burning in neutron star envelopes on cooling in accreting systems
| Autor: | Rudy Wijnands, Mikhail V. Beznogov, L. S. Ootes, Nathalie Degenaar, Philip Chang, M. J. P. Wijngaarden, Dany Page, Wynn C. G. Ho, Andrew Cumming |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Accretion (meteorology) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Luminosity Neutron star Heat flux Space and Planetary Science Thermal radiation 0103 physical sciences Thermal Astrophysics::Solar and Stellar Astrophysics Diffusion (business) 010306 general physics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Envelope (waves) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 493(4), 4936-4944. Oxford University Press |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | Valuable information about the neutron star interior can be obtained by comparing observations of thermal radiation from a cooling neutron star crust with theoretical models. Nuclear burning of lighter elements that diffuse to deeper layers of the envelope can alter the relation between surface and interior temperatures and can change the chemical composition over time. We calculate new temperature relations and consider two effects of diffusive nuclear burning (DNB) for H-C envelopes. First, we consider the effect of a changing envelope composition and find that hydrogen is consumed on short timescales and our temperature evolution simulations correspond to those of a hydrogen-poor envelope within ~100 days. The transition from a hydrogen-rich to a hydrogen-poor envelope is potentially observable in accreting NS systems as an additional initial decline in surface temperature at early times after the outburst. Second, we find that DNB can produce a non-negligible heat flux, such that the total luminosity can be dominated by DNB in the envelope rather than heat from the deep interior. However, without continual accretion, heating by DNB in H-C envelopes is only relevant for 10 pages, 10 figures; Published in MNRAS |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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