An XMM-Newton view of the Symbiotic Stars HM Sge, NQ Gem, and PU Vul
arXiv:2301.08191 · doi:10.3847/1538-4357/acc659
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 -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 -type symbiotic star HM Sge which we suggest is produced by periodic mass ejections such as jets. Consequently, we suggest that a simple -type classification no longer applies to HM Sge. Finally, the spectrum of the -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 -type symbiotic stars are needed in order to peer into the accretion process from such systems.
arXiv comment9 pages, 2 Tables, 3 Figures; Accepted to ApJ
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