Chandra HETG X-ray Spectra and Variability of $π$ Aqr, a $γ$ Cas-type Be star
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | 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. |
| author_facet | 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. |
| contents | High-resolution X-ray spectra of $π\,$Aqr, a $γ\,$Cas-type star, obtained with the Chandra/HETG grating 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 period of about 3400 seconds 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_16977 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chandra HETG X-ray Spectra and Variability of $π$ Aqr, a $γ$ Cas-type Be star 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. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena High-resolution X-ray spectra of $π\,$Aqr, a $γ\,$Cas-type star, obtained with the Chandra/HETG grating 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 period of about 3400 seconds 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. |
| title | Chandra HETG X-ray Spectra and Variability of $π$ Aqr, a $γ$ Cas-type Be star |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2404.16977 |