SIMBAD references

2019ApJ...878...53X - Astrophys. J., 878, 53-53 (2019/June-2)

The Fe line flux ratio as a diagnostic of the maximum temperature and the white dwarf mass of cataclysmic variables.

XU X.-J., YU Z.-L. and LI X.-D.

Abstract (from CDS):

The flux ratio of Fe XXVI-Lyα to Fe XXV-Heα lines (I7.0/I6.7) is a sensitive indicator of the maximum temperature (Tmax), and therefore the mass of white dwarf stars (MWD) in cataclysmic variables (CVs). To examine and calibrate the theoretical I7.0/I6.7-Tmax-MWD relations, reliable measurements of Tmax and I7.0/I6.7 are necessary. In this work, we conduct a thorough investigation of 3-50 keV X-ray spectra of 25 solar neighborhood magnetic and nonmagnetic CVs based on archival NuSTAR and Suzaku observations. The measured Tmax are compared to the I7.0/I6.7 and MWD. The results show that the sampled CVs closely follow the theoretical I7.0/I6.7-Tmax relation. Moreover, all the MWD estimated from I7.0/I6.7 are consistent with the dynamically measured ones. We conclude that I7.0/I6.7 can be used as a good diagnostic for Tmax and MWD in both magnetic and nonmagnetic CVs.

Abstract Copyright: © 2019. The American Astronomical Society.

Journal keyword(s): binaries: close - novae, cataclysmic variables - X-rays: binaries

Simbad objects: 28

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