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- W4367627706 abstract "We present the analysis of archival XMM-Newton observations of the symbiotic stars HM Sge, NQ Gem, and PU Vul. The EPIC-pn spectra hint at the presence of emission lines, which are further confirmed in the 1st order RGS spectra of the three sources. Spectral modeling of the EPIC-pn data disclose unprecedented characteristics, for instance, the best fit to the EPIC-pn spectrum of the $beta$-type symbiotic star PU Vul reveals the presence of two plasma components. We report the discovery of an extremely soft spectral component in the EPIC-pn spectrum of the $beta$-type symbiotic star HM Sge which we suggest is produced by periodic mass ejections such as jets. Consequently, we suggest that a simple $beta$-type classification no longer applies to HM Sge. Finally, the spectrum of the $beta/delta$-type symbiotic star NQ Gem can not be fitted by a two-temperature plasma model as performed by previous authors. The model requires extra components to fit the 1.0-4.0 keV energy range. More sophisticated models to $beta/delta$-type symbiotic stars are needed in order to peer into the accretion process from such systems." @default.
- W4367627706 created "2023-05-02" @default.
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- W4367627706 date "2023-04-28" @default.
- W4367627706 modified "2023-10-01" @default.
- W4367627706 title "An XMM-Newton View of the Symbiotic Stars HM Sge, NQ Gem, and PU Vul" @default.
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- W4367627706 doi "https://doi.org/10.3847/1538-4357/acc659" @default.
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