First NuSTAR hard X-ray study of EF Eri in its new high state yields a white dwarf mass of 0.55-0.63 solar masses, matching the optical value.
EUVE Spectroscopy of Polars
1 Pith paper cite this work. Polarity classification is still indexing.
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abstract
An admittedly pedantic but hopefully useful and informative analysis is presented of the EUVE 70--180 Angstrom spectra of nine polars. These spectra are fit with three different models---a blackbody, a pure-H stellar atmosphere, and a solar abundance stellar atmosphere---to reveal the presence of spectral features such as absorption lines and edges, and to investigate the sensitivity of the derived (kT, N_H, solid angle) and inferred (fractional emitting area, bolometric luminosity) parameters to the model assumptions. Among the models tested, the blackbody model best describes the observed spectra, although the untested irradiated solar abundance stellar atmosphere model is likely a better overall description of the EUV/soft X-ray spectra of polars.
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NuSTAR broadband X-ray observation of EF Eri following its reawakening into a high accretion state
First NuSTAR hard X-ray study of EF Eri in its new high state yields a white dwarf mass of 0.55-0.63 solar masses, matching the optical value.