The post-common-envelope X-ray binary nucleus of the planetary nebula NGC 2392
| العنوان: | The post-common-envelope X-ray binary nucleus of the planetary nebula NGC 2392 |
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| المؤلفون: | Ana Escorza, R. Manick, Hans Van Winckel, Brent Miszalski |
| المصدر: | Publications Astronomical Society of Australia |
| بيانات النشر: | Cambridge University Press (CUP), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | X-ray binary, Astrophysics, 01 natural sciences, Common envelope, accretion, Astrophysics::Solar and Stellar Astrophysics, individual, individual: NGC 2392 (PN G197.8+17.3) [planetary nebulae], 010303 astronomy & astrophysics, white dwarfs, Physics, accretion, accretion disks, Nebula, PROGENITORS, accretion disks, radial velocities [techniques], planetary nebulae, Radial velocity, Supernova, Astrophysics - Solar and Stellar Astrophysics, Physical Sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, 8+17, ABUNDANCES, X-rays, 0103 physical sciences, general [planetary nebulae], 3), Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, Astrophysique, Science & Technology, RADIAL-VELOCITY, 010308 nuclear & particles physics, CONSTRAINTS, White dwarf, Astronomy and Astrophysics, WIND, Astronomie, Planetary nebula, Accretion (astrophysics), Sciences de l'espace, TURBULENT OUTFLOWS, general, Space and Planetary Science, DISCOVERY, binaries [X-rays], CENTRAL STARS, techniques, binaries, EMISSION, radial velocities, NGC 2392 (PN G197 |
| الوصف: | The Chandra X-ray Observatory has detected relatively hard X-ray emission from the central stars of several planetary nebulae (PNe). A subset has no known late-type companions, making it very difficult to isolate which of several competing mechanisms may be producing the X-ray emission. The central star of NGC 2392 is one of the most vexing members, with substantial indirect evidence for a hot white dwarf (WD) companion. Here we report on the results of a radial velocity (RV) monitoring campaign of its central star with the HERMES échelle spectrograph of the Flemish 1.2 m Mercator telescope. We discover a single-lined spectroscopic binary with an orbital period of 1.902208 ± 0.000013 d and an RV semi-amplitude of 9.96 ± 0.13 km s -1 .The high degree of nebula ionisation requires a WD companion (M ≳ 3 0.6M o ), which the mass-function supports at orbital inclinations ‰2 7°, in agreement with the nebula orientation of 9°. The hard component of the X-ray spectrum may be explained by the companion accreting mass from the wind of the Roche lobe filling primary, while the softer component may be due to colliding winds. A companion with a stronger wind than the primary could produce the latter and would be consistent with models of the observed diffuse X-ray emission detected in the nebula. The diffuse X-rays may also be powered by the jets of up to 180 km s -1 ,and active accretion would imply that they may be the first active jets of a post-common-envelope PN, potentially making NGC 2392 an invaluable laboratory to study jet formation physics. The 1.9 d orbital period rules out a double-degenerate merger leading to a Type Ia supernova, and the weak wind of the primary likely also precludes a single-degenerate scenario. We suggest that a hard X-ray spectrum, in the absence of a late-type companion, could be a powerful tool to identify accreting WD companions. SCOPUS: ar.j info:eu-repo/semantics/published |
| وصف الملف: | 1 full-text file(s): application/pdf |
| تدمد: | 1448-6083 1323-3580 |
| DOI: | 10.1017/pasa.2019.11 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f48b349a4a4c32bdfdfa59475a95e5b6 https://doi.org/10.1017/pasa.2019.11 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....f48b349a4a4c32bdfdfa59475a95e5b6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14486083 13233580 |
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| DOI: | 10.1017/pasa.2019.11 |