Indications of Magnetic Accretion in Swift J0826.2-7033

Nikita Rawat,Domitilla De Martino,Koji Mukai,Maurizio Falanga,Nicola Masetti,Jeewan C. Pandey

Astronomy and Astrophysics（2024）SCI 2区

Aryabhatta Res Inst Observat Sci ARIES | Ist Nazl Astrofis | NASA GSFC | Int Space Sci Inst ISSI

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Abstract

We present our findings from the first long X-ray observation of the hard X-ray source Swift J0826.2-7033 with XMM-Newton, which has shown characteristics of magnetic accretion. The system appears to have a long orbital period (similar to 7.8 h) accompanied by short timescale variabilities, which we tentatively interpret as the spin and beat periods of an intermediate polar. These short- and long-timescale modulations are energy-independent, suggesting that photoelectric absorption does not play any role in producing the variabilities. If our suspected spin and beat periods are true, then Swift J0826.2-7033 accretes via disc-overflow with an equal fraction of accretion taking place via disc and stream. The XMM-Newton and Swift-BAT spectral analysis reveals that the post-shock region in Swift J0826.2-7033 has a multi-temperature structure with a maximum temperature of similar to 43 keV, which is absorbed by a material with an average equivalent hydrogen column density of similar to 1.6 x 10(22) cm(-2) that partially covers similar to 27% of the X-ray source. The suprasolar abundances, with hints of an evolved donor, collectively make Swift J0826.2-7033 an interesting target, which likely underwent a thermal timescale mass transfer phase.

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Key words

accretion, accretion disks,novae,cataclysmic variables,stars: individual: Swift J0826.2-7033,stars: individual: 1RXS J082623.5-703142,stars: individual: PBC J0826.3-7033,X-rays: stars

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