期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 471, 期 3, 页码 2902-2916出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1560
关键词
accretion; accretion discs; novae; cataclysmic variables; pulsars: general; white dwarfs; X-rays: individual: RX J0838-2827; X-rays: individual: XMM J083850.4-282759
资金
- ESA member states
- National Aeronautics and Space Administration (NASA)
- NASA
- National Science Foundation
- CONACyT [G28586-E]
- European Organization for Astronomical Research in the Southern Hemisphere under ESO program [296.D-5034]
- Australian Government
- NWO Vidi Grant [A.2320.0076]
- European COST Action [MP1304]
- International Space Science Institute (ISSI-Bern)
- EU Marie Sklodowska Curie [660657-TMSP-H2020-MSCA-IF-2014]
- FEDER
- EU's Horizon programme through a Marie Sklodowska-Curie Fellowship [702638]
- Leverhulme Trust [VP2-2015-046]
- [AYA2015-71042-P]
- [SGR2014-1073]
- [INAF-ASI I/037/12/0]
- [ESP2015-66134-R]
- [SGR2014-1458]
- [AYA2013-42627]
- Marie Curie Actions (MSCA) [702638] Funding Source: Marie Curie Actions (MSCA)
In a search for the counterpart to the Fermi-LAT source 3FGL J0838.8-2829, we performed a multiwavelength campaign: in the X-ray band with Swift and XMM-Newton; in the infrared and optical with OAGH, ESO-NTT and IAC80; and in the radio with ATCA observations. We also used archival hard X-ray data obtained by INTEGRAL. We report on three X-ray sources consistent with the position of the Fermi-LAT source. We confirm the identification of the brightest object, RX J0838-2827, as a magnetic cataclysmic variable that we recognize as an asynchronous system (not associated with the Fermi-LAT source). RX J0838-2827 is extremely variable in the X-ray and optical bands, and timing analysis reveals the presence of several periodicities modulating its X-ray and optical emission. The most evident modulations are interpreted as being caused by the binary system orbital period of similar to 1.64 h and the white dwarf spin period of similar to 1.47 h. A strong flux modulation at similar to 15 h is observed at all energy bands, consistent with the beat frequency between spin and orbital periods. Optical spectra show prominent H beta, He I and He II emission lines that are Doppler-modulated at the orbital period and at the beat period. Therefore, RX J0838-2827 accretes through a disc-less configuration and could be either a strongly asynchronous polar or a rare example of a pre-polar system on its way to reaching synchronism. Regarding the other two X-ray sources, XMM J083850.4-282759 showed a variable X-ray emission, with a powerful flare lasting for similar to 600 s, similar to what is observed in transitional millisecond pulsars during the subluminous disc state: this observation possibly means that this source can be associated with the Fermi-LAT source.
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