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Chandra X-ray study confirms that the magnetic standard Ap star KQ Vel hosts a neutron star companion

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dc.contributor.author Oskinova L.M.
dc.contributor.author Ignace R.
dc.contributor.author Leto P.
dc.contributor.author Postnov K.A.
dc.date.accessioned 2021-02-24T20:31:45Z
dc.date.available 2021-02-24T20:31:45Z
dc.date.issued 2020
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/160721
dc.description.abstract © ESO 2020. Context. KQ Vel is a peculiar A0p star with a strong surface magnetic field of about 7.5 kG. It has a slow rotational period of nearly 8 years. Bailey et al. (A&A, 575, A115) detected a binary companion of uncertain nature and suggested that it might be a neutron star or a black hole. Aims. We analyze X-ray data obtained by the Chandra telescope to ascertain information about the stellar magnetic field and/or interaction between the star and its companion. Methods. We confirm previous X-ray detections of KQ Vel with a relatively high X-ray luminosity of 2 × 1030 erg s-1. The X-ray spectra suggest the presence of hot gas at > 20 MK and, possibly, of a nonthermal component. The X-ray light curves are variable, but data with better quality are needed to determine a periodicity, if any. Results. We interpret the X-ray spectra as a combination of two components: the nonthermal emission arising from the aurora on the A0p star, and the hot thermal plasma filling the extended shell that surrounds the "propelling"neutron star. Conclusions. We explore various alternatives, but a hybrid model involving the stellar magnetosphere along with a hot shell around the propelling neutron star seems most plausible. We speculate that KQ Vel was originally a triple system and that the Ap star is a merger product. We conclude that KQ Vel is an intermediate-mass binary consisting of a strongly magnetic main-sequence star and a neutron star.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject Binaries: spectroscopic
dc.subject Magnetic fields
dc.subject Stars: chemically peculiar
dc.subject Stars: individual: KQ Vel
dc.subject X-rays: binaries
dc.subject X-rays: individuals: KQ Vel
dc.title Chandra X-ray study confirms that the magnetic standard Ap star KQ Vel hosts a neutron star companion
dc.type Article
dc.relation.ispartofseries-volume 641
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00046361-2020-641-SID85091988446

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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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