Huenemoerder, D.P. orcid.org/0000-0002-3860-6230, Pradhan, P. orcid.org/0000-0002-1131-3059, Canizares, C.R. orcid.org/0000-0002-5769-8441 et al. (7 more authors) (2024) Chandra HETG X-ray spectra and variability of π Aqr, a γ Cas-type Be star. The Astrophysical Journal Letters, 966 (2). L23. ISSN 2041-8205
Abstract
High-resolution X-ray spectra of π Aqr, a γ Cas-type star, obtained with the Chandra/HETG spectrometer, revealed emission lines of H-like ions of Mg, Si, S, and Fe; a strong, hard continuum; and a lack of He-like ions, indicating the presence of very hot thermal plasma. The X-ray light curve showed significant fluctuations, with coherent variability at a period of about 3400 s in one observation. The hardness ratio was relatively constant except for one observation in which the spectrum was much harder and more absorbed. We interpret the X-ray emission as arising from accretion onto the secondary, which is likely a magnetic white dwarf, an intermediate polar system.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (http://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Keywords: | X-ray astronomy (1810); Gamma Cassiopeiae stars (635); High resolution spectroscopy (2096); Early-type emission stars (428); White dwarf stars (1799); Be stars (142) |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Automatic Control and Systems Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 08 May 2024 08:37 |
Last Modified: | 08 May 2024 08:37 |
Status: | Published |
Publisher: | American Astronomical Society |
Refereed: | Yes |
Identification Number: | 10.3847/2041-8213/ad4095 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:212297 |