2024ApJ...975..250G

Query : 2024ApJ...975..250G

2024ApJ...975..250G - Astrophys. J., 975, 250 (2024/November-2)

Hydrodynamical Simulations of Proton Ingestion Flashes in Type I X-Ray Bursts.

GUICHANDUT S., ZINGALE M. and CUMMING A.

Abstract (from CDS):

We perform the first multidimensional fluid simulations of thermonuclear helium ignition underneath a hydrogen-rich shell. This situation is relevant to Type I X-ray bursts on neutron stars that accrete from a hydrogen-rich companion. Using the low-Mach number fluid code MAESTROeX, we investigate the growth of the convection zone due to nuclear burning, and the evolution of the chemical abundances in the atmosphere of the star. We also examine the convective boundary mixing processes that cause the evolution to differ significantly from previous one-dimensional simulations that rely on mixing-length theory. We find that the convection zone grows outward as penetrating fluid elements cool the overlying radiative layer, rather than directly from the increasing entropy of the convection zone itself. Simultaneously, these flows efficiently mix composition, carrying carbon out of and protons into the convection zone even before contact with the hydrogen shell. We discuss the implications of these effects for future modeling of these events and observations.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Neutron stars - Astrophysical fluid dynamics - Stellar convection envelopes

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0

Query : 2024ApJ...975..250G

Basic data :
SAX J1808.4-3658 -- Low Mass X-ray Binary
Other object types: otypes_help 		X (2022MNRAS,PBC,...), LXB (2013ApJS), * (2008ApJ,[RCM98]), Psr (PSR), N* (2014MNRAS), V* (V*), gam (INTREF), Rad ([GSG99])
ICRS coord. (ep=J2000) : 		18 08 27.58 -36 58 43.9 (X-ray) [ 1500 1500 90 ] D 2020A&A...641A.136W
FK4 coord. (ep=B1950 eq=1950) : 		18 05 03.50 -36 59 13.4 [ 1500 1500 90 ]
Gal coord. (ep=J2000) : 		355.38517 -08.14832 [ 1500 1500 90 ]
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Identifiers (14) :
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INTREF 881 SWIFT J1808.5-3655 V* V4580 Sgr [GSG99] J180827.6-365843.9
PBC J1808.3-3656 SwXF4 J180827.6-365842 2XMM J180827.7-365841 [RCM98] J180827.5-365842
PSR J1808-3658 1SXPS J180827.6-365843 4XMM J180827.5-365843
SAX J1808.4-3658 2SXPS J180827.5-365842 XTE J1808-369

References (1051 between 1850 and 2026) (Total 1051)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Observing logs

XMM : 4   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : SAX J1808.4-3658

Link by name to the catalogue in VizieR :

V* V4580 Sgr

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