KRTIČKA, Jiří, Jiří KUBÁT a Iva KRTIČKOVÁ. X-ray irradiation of the stellar wind in HMXBs with B supergiants: Implications for ULXs. Astronomy & Astrophysics. EDP Sciences, roč. 659, March, s. 1-11. ISSN 0004-6361. doi:10.1051/0004-6361/202142502. 2022.
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Základní údaje
Originální název X-ray irradiation of the stellar wind in HMXBs with B supergiants: Implications for ULXs
Autoři KRTIČKA, Jiří (203 Česká republika, garant, domácí), Jiří KUBÁT a Iva KRTIČKOVÁ (203 Česká republika, domácí).
Vydání Astronomy & Astrophysics, EDP Sciences, 2022, 0004-6361.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 10308 Astronomy
Stát vydavatele Francie
Utajení není předmětem státního či obchodního tajemství
WWW URL
Impakt faktor Impact factor: 6.500
Kód RIV RIV/00216224:14310/22:00126397
Organizační jednotka Přírodovědecká fakulta
Doi http://dx.doi.org/10.1051/0004-6361/202142502
UT WoS 000769069100007
Klíčová slova anglicky X-rays: binaries; stars: winds; outflows; stars: mass-loss; stars: early-type; stars: massive; hydrodynamics
Štítky rivok
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnila: Mgr. Marie Šípková, DiS., učo 437722. Změněno: 9. 8. 2022 14:37.
Anotace
Wind-fed high-mass X-ray binaries are powered by accretion of the radiatively driven wind of the luminous component on the compact star. Accretion-generated X-rays alter the ionization state of the wind. Because higher ionization states drive the wind less effectively, X-ray ionization may brake acceleration of the wind. This causes a decrease in the wind terminal velocity and mass flux in the direction toward the X-ray source. Here we study the effect of X-ray ionization on the stellar wind of B supergiants. We determine the binary parameters for which the X-ray irradiation significantly influences the stellar wind. This can be conveniently studied in diagrams that plot the optical depth parameter versus the X-ray luminosity. For low optical depths or for high X-ray luminosities, X-ray ionization leads to a disruption in the wind aimed toward the X-ray source. Observational parameters of high-mass X-ray binaries with B-supergiant components appear outside the wind disruption zone. The X-ray feedback determines the resulting X-ray luminosity. We recognize two states with a different level of feedback. For low X-ray luminosities, ionization is weak, and the wind is not disrupted by X-rays and flows at large velocities, consequently the accretion rate is relatively low. On the other hand, for high X-ray luminosities, the X-ray ionization disrupts the flow braking the acceleration, the wind velocity is low, and the accretion rate becomes high. These effects determine the X-ray luminosity of individual binaries. Accounting for the X-ray feedback, estimated X-ray luminosities reasonably agree with observational values. We study the effect of small-scale wind inhomogeneities (clumping), showing that clumping weakens the effect of X-ray ionization by increasing recombination and the mass-loss rate. This effect is particularly important in the region of the so-called bistability jump. We show that ultraluminous X-ray binaries with LX less than or similar to 10(40) erg s(-1) may be powered by accretion of a B-supergiant wind on a massive black hole.
Návaznosti
LM2018140, projekt VaVNázev: e-Infrastruktura CZ (Akronym: e-INFRA CZ)
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, e-Infrastruktura CZ
VytisknoutZobrazeno: 29. 3. 2024 06:34