Chandra HETG X-Ray Spectra and Variability of π Aqr, a γ Cas-type Be Star
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Título: | Chandra HETG X-Ray Spectra and Variability of π Aqr, a γ Cas-type Be Star |
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Autor/es: | Huenemoerder, David P. | Pradhan, Pragati | Canizares, Claude R. | Gunderson, Sean | Ignace, Richard | Nichols, Joy S. | Pollock, A.M.T. | Schulz, Norbert S. | Swarm, Dustin K. | Torrejon, Jose M. |
Grupo/s de investigación o GITE: | Astronomía y Astrofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías |
Palabras clave: | X-ray astronomy | Gamma Cassiopeiae stars | High resolution spectroscopy | Early-type emission stars | White dwarf stars | Be stars |
Fecha de publicación: | 1-may-2024 |
Editor: | American Astronomical Society | IOP Publishing |
Cita bibliográfica: | The Astrophysical Journal Letters. 2024, 966(2): L23. https://doi.org/10.3847/2041-8213/ad4095 |
Resumen: | 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. |
Patrocinador/es: | Support for this work was provided by NASA through the Smithsonian Astrophysical Observatory (SAO) contract SV3-73016 to MIT for Support of the Chandra X-Ray Center (CXC) and Science Instruments. CXC is operated by SAO for and on behalf of NASA under contract NAS8-03060. This research has made use of ISIS functions (ISISscripts) provided by ECAP/Remeis observatory and MIT (http://www.sternwarte.uni-erlangen.de/isis/). |
URI: | http://hdl.handle.net/10045/142801 |
ISSN: | 2041-8205 (Print) | 2041-8213 (Online) |
DOI: | 10.3847/2041-8213/ad4095 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 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. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.3847/2041-8213/ad4095 |
Aparece en las colecciones: | INV - Astronomía y Astrofísica - Artículos de Revistas |
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