2010
DOI: 10.1051/0004-6361/200913341
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X-Shooting EF Eridani: further evidence for a massive white dwarf and a sub-stellar secondary

Abstract: High resolution spectral observations of the polar EF Eridani obtained in a low state with X-Shooter revealed narrow emission lines from the irradiated secondary. The lines were most prominent in the near-IR Caii-triplet, the more intensive Hα line had additional emission likely originating from an accretion stream. The lines with a radial velocity amplitude, K 2 = 385 ± 4 km s −1 , serve as tracer of the otherwise unseen companion. The mass function implies a massive white dwarf with M wd > 0.65 M at 3σ confi… Show more

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Cited by 16 publications
(13 citation statements)
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References 30 publications
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“…The first year of operations confirms the high versatility of the instrument and the very broad range of topics tackled by X-shooter, as anticipated in the original science case analysis, from stellar astrophysics (see e.g. Bragaglia et al 2010;Schwope & Christensen 2010;Rigliaco et al 2011;Kaper et al 2011), cosmic explosions (e.g. de Ugarte Postigo et al 2010;D'Elia et al 2010) to the high redshift Universe (e.g.…”
Section: Overview and Future Upgradessupporting
confidence: 59%
“…The first year of operations confirms the high versatility of the instrument and the very broad range of topics tackled by X-shooter, as anticipated in the original science case analysis, from stellar astrophysics (see e.g. Bragaglia et al 2010;Schwope & Christensen 2010;Rigliaco et al 2011;Kaper et al 2011), cosmic explosions (e.g. de Ugarte Postigo et al 2010;D'Elia et al 2010) to the high redshift Universe (e.g.…”
Section: Overview and Future Upgradessupporting
confidence: 59%
“…SDSS J 1433+1011 and WZ Sge are non-magnetic CVs, while EF Eri has been the textbook example for a LARP, but is also considered a candidate period bouncer (Schwope et al 2007;Schwope & Christensen 2010). The X-ray luminosity of EF Eri (2 × 10 29 erg/s; see Schwope et al 2007) is remarkably similar to our measurement for SDSS 1212 .…”
Section: Discussionsupporting
confidence: 82%
“…Apart from the stronger underlying Paschen lines, the Ca ii line profiles observed here are very similar to those of EF Eridani in its low state (Schwope & Christensen 2010). We thus apply to the data of HU Aqr the same irradiation model as applied to EF Eri.…”
Section: Notesmentioning
confidence: 61%
“…This assessment needs to be revised. The recent analyses of EF Eri (Schwope & Christensen 2010), EX Hya (Beuermann & Reinsch 2008) and the present one of HU Aqr successfully make use of the Ca lines which appear less influenced by shielding and less contaminated by stream emission than other species. For those reasons, the Balmer lines, although most prominent in the spectra of polars, are clearly not suited for that exercise.…”
Section: Discussionmentioning
confidence: 85%
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