DIRECT DETECTION OF THE L-DWARF DONOR IN WZ SAGITTAE

DIRECT DETECTION OF THE L-DWARF DONOR IN WZ SAGITTAE

ABSTRACT Analysis of a large set of phase-resolved K-band spectra of the cataclysmic variable WZ Sge shows that the secondary star of this system appears to be an L-dwarf. Previous K-band spectra of WZ Sge found that the CO overtone bandheads were in emission. We show that absorption from the 12CO(2...

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Veröffentlicht in:The Astrophysical journal 2016-01, Vol.816 (1), p.1-6
1. Verfasser: Harrison, Thomas E.
Format: Artikel
Sprache:eng
Schlagworte:
ABSORPTION SPECTRA
Amplitudes
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Band spectra
brown dwarfs
CARBON MONOXIDE
Cataclysmic variables
DETECTION
DIAGRAMS
Dipping
DWARF STARS
Emission
EMISSION SPECTRA
NOVAE
novae, cataclysmic variables
RADIAL VELOCITY
Spectra
Spectral emissivity
Stars
stars: dwarf novae
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Zusammenfassung:ABSTRACT Analysis of a large set of phase-resolved K-band spectra of the cataclysmic variable WZ Sge shows that the secondary star of this system appears to be an L-dwarf. Previous K-band spectra of WZ Sge found that the CO overtone bandheads were in emission. We show that absorption from the 12CO(2,0) bandhead of the donor star creates a dip in the 12CO(2,0) emission feature. Measuring the motion of this feature over the orbital period, we construct a radial velocity curve that gives a velocity amplitude of Kabs = 520 35 km s−1, consistent with the previously published values for this parameter.
ISSN:0004-637X
1538-4357
DOI:10.3847/0004-637X/816/1/4