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Multiwavelength observations of V479 Andromedae: a close compact binary with an identity crisis
Solar and Stellar Astrophysics · Submitted 22 Mar 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim If the strongly magnetic white dwarf in V479 And. is confirmed by future observations, the system the polar with the longest observed orbital period.
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The abstract, sentence by sentence
We conducted a multi-wavelength study to unveil the properties of the extremely long-period cataclysmic variable V479 And. We performed series of observations, including moderate to high spectral resolution optical spectrophotometry, X-ray observations with Swift, linear polarimetry and near-IR photometry. This binary system is a low-inclination ~ 17^o system with a 0.594093(4) day orbital period. The absorption line complex in the spectra indicate a G8--K0 spectral type for the donor star, which has departed from the zero-age main sequence. This implies a distance to the object of about 4 kpc. The primary is probably a massive 1.1-1.4 Msun magnetic white dwarf, accreting matter at a rate M(dot) > 10^-10 Msun/ yr. This rate can be achieved if the donor star fills its corresponding Roche lobe, but there is little observational evidence for a mass-transfer stream in this system. An alternative explanation is a stellar wind from the donor star, although such a high rate mass loss is not anticipated from a subgiant. If the strongly magnetic white dwarf in V479 And. is confirmed by future observations, the system the polar with the longest observed orbital period. We also discuss the evolutionary state of V479 And.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We conducted a multi-wavelength study to unveil the properties of the extremely long-period cataclysmic variable V479 And. | contribution 0.99 | 0.95 | 0.04 | asserted 0.89 |
| s1 | We performed series of observations, including moderate to high spectral resolution optical spectrophotometry, X-ray observations with Swift, linear polarimetry and near-IR photometry. | method 0.99 | 0.97 | 0.02 | asserted 0.98 |
| s2 | This binary system is a low-inclination ~ 17^o system with a 0.594093(4) day orbital period. | result 1.00 | 0.83 | 0.09 | asserted 1.00 |
| s3 | The absorption line complex in the spectra indicate a G8--K0 spectral type for the donor star, which has departed from the zero-age main sequence. | result 0.98 | 0.85 | 0.06 | hedged possibility 0.61 |
| s4 | This implies a distance to the object of about 4 kpc. | interpretation 0.83 | 0.80 | 0.06 | hedged possibility 0.66 |
| s5 | The primary is probably a massive 1.1-1.4 Msun magnetic white dwarf, accreting matter at a rate M(dot) > 10^-10 Msun/ yr. | result 0.57 | 0.71 | 0.21 | hedged possibility 1.00 |
| s6 | This rate can be achieved if the donor star fills its corresponding Roche lobe, but there is little observational evidence for a mass-transfer stream in this system. | interpretation 0.92 | 0.65 | 0.09 | hedged possibility 0.92 |
| s7 | An alternative explanation is a stellar wind from the donor star, although such a high rate mass loss is not anticipated from a subgiant. | interpretation 0.99 | 0.22 | 0.04 | hedged possibility 0.79 |
| s8 | If the strongly magnetic white dwarf in V479 And. is confirmed by future observations, the system the polar with the longest observed orbital period. | interpretation 0.64 | 0.12 | 0.39 | hedged possibility 0.84 |
| s9 | We also discuss the evolutionary state of V479 And. | contribution 0.89 | 0.54 | 0.03 | unclear 0.79 |
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Original abstract
We conducted a multi-wavelength study to unveil the properties of the extremely long-period cataclysmic variable V479 And. We performed series of observations, including moderate to high spectral resolution optical spectrophotometry, X-ray observations with Swift, linear polarimetry and near-IR photometry. This binary system is a low-inclination ~ 17^o system with a 0.594093(4) day orbital period. The absorption line complex in the spectra indicate a G8--K0 spectral type for the donor star, which has departed from the zero-age main sequence. This implies a distance to the object of about 4 kpc. The primary is probably a massive 1.1-1.4 Msun magnetic white dwarf, accreting matter at a rate M(dot) > 10^-10 Msun/ yr. This rate can be achieved if the donor star fills its corresponding Roche lobe, but there is little observational evidence for a mass-transfer stream in this system. An alternative explanation is a stellar wind from the donor star, although such a high rate mass loss is not anticipated from a subgiant. If the strongly magnetic white dwarf in V479 And. is confirmed by future observations, the system the polar with the longest observed orbital period. We also discuss the evolutionary state of V479 And.
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