A possible nonthermal X-ray emission from γ Cas analogues stars
Abstract: We analyze the archival XMM-Newton X-ray observations of 15 γ Cas analogue stars and two candidates for such objects. The EPIC spectra of the considered stars in the range of 0.2-8 keV were extracted and fitted by different models. Our estimates show that assuming the X-ray emission from γ Cas analogues to be totally thermal, their model plasma temperatures can reach anomalously high values. However including an additional power components to the model spectra leads to significant decreasing of the plasma temperatures. The spectral index of the power component is about 1.5, and the fraction of this in the total model flux is rather large (50-90%). Moreover, it decreases with expanding temperature of the X-ray emitting plasma as compared to typical OB stars. We conclude that γ Cas analogues can produce nonthermal X-ray emission within the framework of the Chen & White (1991) model, while if the nonthermal X-rays from typical OB stars exists, they should be generated by different processes.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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A possible nonthermal X-ray emission from γ Cas analogues stars ; volume:30 ; number:1 ; year:2021 ; pages:132-143 ; extent:12
Open astronomy ; 30, Heft 1 (2021), 132-143 (gesamt 12)
- Urheber
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Ryspaeva, Elizaveta B.
Kholtygin, Alexander F.
- DOI
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10.1515/astro-2021-0018
- URN
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urn:nbn:de:101:1-2405281621331.813017590522
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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14.08.2025, 10:57 MESZ
Datenpartner
Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Beteiligte
- Ryspaeva, Elizaveta B.
- Kholtygin, Alexander F.
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