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Irradiated atmospheres of accreting magnetic white dwarfs with an application to the polar AM Herculis
Astrophysics · Submitted 22 Dec 2005
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim It also confirms the hypotheses (i) that irradiation by cyclotron radiation and other radiation sources is the principle cause for the large heated polar caps surrounding the accretion spots on white dwarfs in polars and (ii) that much of the reprocessed light appears in the far ultraviolet and not in the soft X-ray regime as suggested in the original simple theories.
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The abstract, sentence by sentence
We present a pilot study of atmospheres of accreting magnetic white dwarfs irradiated by intense fluxes at ultraviolet to infrared wavelengths. The model uses a standard LTE stellar atmosphere code which is expanded by introducing an angle-dependent external radiation source. The present results are obtained for an external source with the spectral shape of a 10000K blackbody and a freely adjustable spectral flux. The model provides an explanation for the observed largely filled-up Lyman lines in the prototype polar AM Herculis during its high states. It also confirms the hypotheses (i) that irradiation by cyclotron radiation and other radiation sources is the principle cause for the large heated polar caps surrounding the accretion spots on white dwarfs in polars and (ii) that much of the reprocessed light appears in the far ultraviolet and not in the soft X-ray regime as suggested in the original simple theories. We also briefly discuss the role played by hard X-rays in heating the polar cap.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a pilot study of atmospheres of accreting magnetic white dwarfs irradiated by intense fluxes at ultraviolet to infrared wavelengths. | contribution 1.00 | 0.89 | 0.06 | asserted 0.93 |
| s1 | The model uses a standard LTE stellar atmosphere code which is expanded by introducing an angle-dependent external radiation source. | method 1.00 | 0.79 | 0.03 | asserted 1.00 |
| s2 | The present results are obtained for an external source with the spectral shape of a 10000K blackbody and a freely adjustable spectral flux. | method 0.99 | 0.79 | 0.04 | asserted 0.99 |
| s3 | The model provides an explanation for the observed largely filled-up Lyman lines in the prototype polar AM Herculis during its high states. | result 0.53 | 0.83 | 0.38 | asserted 0.94 |
| s4 | It also confirms the hypotheses (i) that irradiation by cyclotron radiation and other radiation sources is the principle cause for the large heated polar caps surrounding the accretion spots on white dwarfs in polars and (ii) that much of the reprocessed light appears in the far ultraviolet and not in the soft X-ray regime as suggested in the original simple theories. | interpretation 0.82 | 0.71 | 0.68 | asserted 1.00 |
| s5 | We also briefly discuss the role played by hard X-rays in heating the polar cap. | contribution 0.67 | 0.50 | 0.04 | unclear 0.94 |
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The paper
Original abstract
We present a pilot study of atmospheres of accreting magnetic white dwarfs irradiated by intense fluxes at ultraviolet to infrared wavelengths. The model uses a standard LTE stellar atmosphere code which is expanded by introducing an angle-dependent external radiation source. The present results are obtained for an external source with the spectral shape of a 10000K blackbody and a freely adjustable spectral flux. The model provides an explanation for the observed largely filled-up Lyman lines in the prototype polar AM Herculis during its high states. It also confirms the hypotheses (i) that irradiation by cyclotron radiation and other radiation sources is the principle cause for the large heated polar caps surrounding the accretion spots on white dwarfs in polars and (ii) that much of the reprocessed light appears in the far ultraviolet and not in the soft X-ray regime as suggested in the original simple theories. We also briefly discuss the role played by hard X-rays in heating the polar cap.
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