2023ApJ...948...14T -
Astrophys. J., 948, 14 (2023/May-1)
An XMM-Newton View of the Symbiotic Stars HM Sge, NQ Gem, and PU Vul.
TOALA J.A., BOTELLO M.K. and SABIN L.
Abstract (from CDS):
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 first-order RGS spectra of the three sources. Spectral modeling of the EPIC-pn data discloses unprecedented characteristics; for instance, the best fit to the EPIC-pn spectrum of the β-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 β-type symbiotic star HM Sge, which we suggest is produced by periodic mass ejections such as jets. Consequently, we suggest that a simple β-type classification no longer applies to HM Sge. Finally, the spectrum of the β/δ-type symbiotic star NQ Gem cannot 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 β/δ-type symbiotic stars are needed in order to peer into the accretion process from such systems.
Abstract Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Symbiotic binary stars - Stellar accretion - White dwarf stars - Low mass stars
Simbad objects:
6
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2023ApJ...948...14T and select 'bookmark this link' or equivalent in the popup menu