Wind inhibition by X-ray irradiation in HMXBs: the influence of
clumping and the final X-ray luminosity

J 2018

Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity

KRTIČKA, Jiří, Jiří KUBÁT a Iva KRTIČKOVÁ

Základní údaje

Originální název

Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity

Autoři

KRTIČKA, Jiří (203 Česká republika, garant, domácí), Jiří KUBÁT (203 Česká republika) a Iva KRTIČKOVÁ (203 Česká republika, domácí)

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2018, 1432-0746

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 6.209

Kód RIV

RIV/00216224:14310/18:00101470

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201833419

UT WoS

000452732000003

Klíčová slova anglicky

stars: winds outflows; stars: mass-loss; stars: early-type; hydrodynamics; X-rays: binaries

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 2. 1. 2019 01:10, prof. Mgr. Jiří Krtička, Ph.D.

Anotace

V originále

Context. In wind-powered X-ray binaries, the radiatively driven stellar wind from the primary may be inhibited by the X-ray irradiation. This creates the feedback that limits the X-ray luminosity of the compact secondary. Wind inhibition might be weakened by the effect of small-scale wind inhomogeneities (clumping) possibly affecting the limiting X-ray luminosity. Aims. We study the influence of X-ray irradiation on the stellar wind for different radial distributions of clumping. Methods. We calculate hot star wind models with external irradiation and clumping using our global wind code. The models are calculated for different parameters of the binary. We determine the parameters for which the X-ray wind ionization is so strong that it leads to a decrease of the radiative force. This causes a decrease of the wind velocity and even of the mass-loss rate in the case of extreme X-ray irradiation. Results. Clumping weakens the effect of X-ray irradiation because it favours recombination and leads to an increase of the wind mass-loss rate. The best match between the models and observed properties of high-mass X-ray binaries (HMXBs) is derived with radially variable clumping. We describe the influence of X-ray irradiation on the terminal velocity and on the mass-loss rate in a parametric way. The X-ray luminosities predicted within the Bondi-Hoyle-Lyttleton theory agree nicely with observations when accounting for X-ray irradiation. Conclusions. The ionizing feedback regulates the accretion onto the compact companion resulting in a relatively stable X-ray source. The wind-powered accretion model can account for large luminosities in HMXBs only when introducing the ionizing feedback. There are two possible states following from the dependence of X-ray luminosity on the wind terminal velocity and mass-loss rate. One state has low X-ray luminosity and a nearly undisturbed wind, and the second state has high X-ray luminosity and exhibits a strong influence of X-rays on the flow.

Návaznosti

GA18-05665S, projekt VaV

Název: Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

Investor: Grantová agentura ČR, Ztráta hmoty v pozdních fázích vývoje hmotných hvězd

Citovat

KRTIČKA, Jiří, Jiří KUBÁT a Iva KRTIČKOVÁ. Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2018, roč. 620, podzim, s. "A150-1"-"A150-14", 14 s. ISSN 1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201833419.

@article{1482078,
   author = {Krtička, Jiří and Kubát, Jiří and Krtičková, Iva},
   article_location = {LES ULIS CEDEX A},
   article_number = {podzim},
   doi = {http://dx.doi.org/10.1051/0004-6361/201833419},
   keywords = {stars: winds outflows; stars: mass-loss; stars: early-type; hydrodynamics; X-rays: binaries},
   language = {eng},
   issn = {1432-0746},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity},
   url = {http://adsabs.harvard.edu/abs/2018A%26A...620A.150K},
   volume = {620},
   year = {2018}
}

TY  - JOUR
ID  - 1482078
AU  - Krtička, Jiří - Kubát, Jiří - Krtičková, Iva
PY  - 2018
TI  - Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 620
IS  - podzim
SP  - "A150-1"-"A150-14"
EP  - "A150-1"-"A150-14"
PB  - EDP SCIENCES S A
SN  - 14320746
KW  - stars: winds outflows
KW  - stars: mass-loss
KW  - stars: early-type
KW  - hydrodynamics
KW  - X-rays: binaries
UR  - http://adsabs.harvard.edu/abs/2018A%26A...620A.150K
N2  - Context. In wind-powered X-ray binaries, the radiatively driven stellar wind from the primary may be inhibited by the X-ray irradiation. This creates the feedback that limits the X-ray luminosity of the compact secondary. Wind inhibition might be weakened by the effect of small-scale wind inhomogeneities (clumping) possibly affecting the limiting X-ray luminosity. Aims. We study the influence of X-ray irradiation on the stellar wind for different radial distributions of clumping. Methods. We calculate hot star wind models with external irradiation and clumping using our global wind code. The models are calculated for different parameters of the binary. We determine the parameters for which the X-ray wind ionization is so strong that it leads to a decrease of the radiative force. This causes a decrease of the wind velocity and even of the mass-loss rate in the case of extreme X-ray irradiation. Results. Clumping weakens the effect of X-ray irradiation because it favours recombination and leads to an increase of the wind mass-loss rate. The best match between the models and observed properties of high-mass X-ray binaries (HMXBs) is derived with radially variable clumping. We describe the influence of X-ray irradiation on the terminal velocity and on the mass-loss rate in a parametric way. The X-ray luminosities predicted within the Bondi-Hoyle-Lyttleton theory agree nicely with observations when accounting for X-ray irradiation. Conclusions. The ionizing feedback regulates the accretion onto the compact companion resulting in a relatively stable X-ray source. The wind-powered accretion model can account for large luminosities in HMXBs only when introducing the ionizing feedback. There are two possible states following from the dependence of X-ray luminosity on the wind terminal velocity and mass-loss rate. One state has low X-ray luminosity and a nearly undisturbed wind, and the second state has high X-ray luminosity and exhibits a strong influence of X-rays on the flow.
ER  -

KRTIČKA, Jiří, Jiří KUBÁT a Iva KRTIČKOVÁ. Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2018, roč.~620, podzim, s.~''A150-1''-''A150-14'', 14 s. ISSN~1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201833419.

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