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HIRES Spectroscopy of Magnetic White Dwarfs McAnerin, Mark
Abstract
The atmospheres of magnetic white dwarfs behave as theoretical analogues to neutron stars. The magnetic fields strengths and effective temperatures of the white dwarfs with the strongest magnetic fields are both two to three orders of magnitude below neutron stars. So the expectation is that their atmospheres and stellar enevelopes will be as difficult to model as neutron stars due to the high degree of anisotropy in the thermal conduction through their atmospheres and envelopes. The construction of spectra and analyzing their absorption features with data taken with the HIRES instrument on Keck-I, could better constrain the models for all magnetic stellar atmospheres. Using the response transfer method of reducing echelle spectra we have created complete relative flux spectra of several magnetic white dwarf targets. Our reference in the reduction is Van Maanen 2, which behaves as a good blackbody and is devoid of spectral features above 4000°A. Errors between orders due to the limitations of our method have prevented assembly of complete continuous spectra, but spectral data seems to indicate that there ranges of spectra up to several hundred angstroms wide with low systematic error, allowing analysis of the large spectral features of magnetic white dwarfs.
Item Metadata
Title |
HIRES Spectroscopy of Magnetic White Dwarfs
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Creator | |
Date Issued |
2007-06
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Description |
The atmospheres of magnetic white dwarfs behave as theoretical analogues to neutron stars. The magnetic fields strengths and effective temperatures of the white dwarfs with the strongest magnetic fields are both two to three
orders of magnitude below neutron stars. So the expectation is that their atmospheres and stellar enevelopes will be as difficult to model as neutron
stars due to the high degree of anisotropy in the thermal conduction through their atmospheres and envelopes. The construction of spectra and analyzing their absorption features with data taken with the HIRES instrument on Keck-I, could better constrain the models for all magnetic stellar atmospheres. Using the response transfer method of reducing echelle spectra we have created complete relative flux spectra of several magnetic white dwarf targets. Our reference in the reduction is Van Maanen 2, which behaves as
a good blackbody and is devoid of spectral features above 4000°A. Errors between orders due to the limitations of our method have prevented assembly of complete continuous spectra, but spectral data seems to indicate that there ranges of spectra up to several hundred angstroms wide with low systematic error, allowing analysis of the large spectral features of magnetic white dwarfs.
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Genre | |
Type | |
Language |
eng
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Series | |
Date Available |
2010-09-15
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0085963
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URI | |
Affiliation | |
Campus | |
Citation |
McAnerin, Mark. 2007. HIRES Spectroscopy of Magnetic White Dwarfs. Undergraduate Honours Thesis. Department of Physics and Astronomy.
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Peer Review Status |
Unreviewed
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Scholarly Level |
Undergraduate
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Copyright Holder |
McAnerin, Mark
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International