The Influence of Stellar Spin on Ignition of Thermonuclear Runaways
| dc.contributor.author | GALLOWAY, Duncan K. | |
| dc.contributor.author | IN 'T ZAND, Jean J.M. | |
| dc.contributor.author | CHENEVEZ, Jérôme | |
| dc.contributor.author | KEEK, Laurens | |
| dc.contributor.author | SANCHEZ-FERNANDEZ, Celia | |
| dc.contributor.author | WORPEL, Hauke | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | LAMPE, Nathanael | |
| dc.contributor.author | KUULKERS, Erik | |
| dc.contributor.author | WATTS, Anna | |
| dc.contributor.author | OOTES, Laura | |
| dc.date.issued | 2018 | |
| dc.description.abstractEn | Runaway thermonuclear burning of a layer of accumulated fuel on the surface of a compact star provides a brief but intense display of stellar nuclear processes. For neutron stars accreting from a binary companion, these events manifest as thermonuclear (type-I) X-ray bursts, and recur on typical timescales of hours to days. We measured the burst rate as a function of accretion rate, from seven neutron stars with known spin rates, using a burst sample accumulated over several decades. At the highest accretion rates, the burst rate is lower for faster spinning stars. The observations imply that fast (>400 Hz) rotation encourages stabilization of nuclear burning, suggesting a dynamical dependence of nuclear ignition on the spin rate. This dependence is unexpected, because faster rotation entails less shear between the surrounding accretion disk and the star. Large-scale circulation in the fuel layer, leading to enhanced mixing of the burst ashes into the fuel layer, may explain this behavior; further numerical simulations are required to confirm this. | |
| dc.language.iso | en | |
| dc.subject.en | nuclear reactions | |
| dc.subject.en | nucleosynthesis | |
| dc.subject.en | abundances | |
| dc.subject.en | stars: neutron | |
| dc.subject.en | stars: rotation | |
| dc.subject.en | X-rays: bursts | |
| dc.title.en | The Influence of Stellar Spin on Ignition of Thermonuclear Runaways | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.3847/2041-8213/aabd32 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1804.03380 | |
| bordeaux.journal | Astrophys.J.Lett | |
| bordeaux.page | L24 | |
| bordeaux.volume | 857 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01781913 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01781913v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astrophys.J.Lett&rft.date=2018&rft.volume=857&rft.issue=2&rft.spage=L24&rft.epage=L24&rft.au=GALLOWAY,%20Duncan%20K.&IN%20'T%20ZAND,%20Jean%20J.M.&CHENEVEZ,%20J%C3%A9r%C3%B4me&KEEK,%20Laurens&SANCHEZ-FERNANDEZ,%20Celia&rft.genre=article |
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