Radio Emission from Algol. I. Coronal Geometry and Emission Mechanisms Determined from VLBA and Green Bank Interferometer Observations

Mutel, R. L.; Molnar, Lawrence A.; Waltman, E. B.; Ghigo, F. D.

doi:10.1086/306311

Cited by 49 publications

(78 citation statements)

References 34 publications

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“…An example of X-ray emitting polar source is AB Dor (Maggio et al 2000). Algol's X-ray and radio emission has also been modeled in terms of a corona confined in the polar regions, with a compact flaring component smaller than the star and a more extended quiescent corona as large as, or larger than, the star (Favata et al 2000;Mutel et al 1998). VLBI images of UV Ceti (Benz et al 1998) reveal that this binary is another example of radio emitting polar source.…”

Section: Er Vulmentioning

confidence: 99%

VLA multifrequency observations of RS CVn binaries

Garcia-Sanchez¹,

Paredes²,

Ribó³

2003

A&A

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Abstract. We present multiepoch Very Large Array (VLA) observations at 1.4 GHz, 4.9 GHz, 8.5 GHz and 14.9 GHz for a sample of eight RS CVn binary systems. Circular polarization measurements of these systems are also reported. Most of the fluxes observed are consistent with incoherent emission from mildly relativistic electrons. Several systems show an increase of the degree of circular polarization with increasing frequency in the optically thin regime, in conflict with predictions by gyrosynchrotron models. We observed a reversal in the sense of circular polarization with increasing frequency in three noneclipsing systems: EI Eri, DM UMa and HD 8358. We find clear evidence for coherent plasma emission at 1.4 GHz in the quiescent spectrum of HD 8358 during the helicity reversal. The degrees of polarization of the other two systems could also be accounted for by a coherent emission process. The observations of ER Vul revealed two U-shaped flux spectra at the highest frequencies. The U-shape of the spectra may be accounted for by an optically thin gyrosynchrotron source for the low frequency part whereas the high frequency part is dominated by a thermal emission component.

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Section: Er Vulmentioning

confidence: 99%

VLA multifrequency observations of RS CVn binaries

Garcia-Sanchez¹,

Paredes²,

Ribó³

2003

A&A

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“…High-energy mechanisms are revealed through light curves from X-ray wavelengths (Stelzer et al 1999). Radioastronomy too has seen remarkable advances in both sensitivity and resolution capability, permitting fuller geometrical insights into the Algol configuration (Mutel et al 1998;Richards et al 1998;Lestrade et al 1999;Gunn et al 1999). Optical astrometry (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Lynch et al 1996;Coleman et al 1998) also have roles in dealing with Algols. With the relatively nearby and bright prototype of β Per itself, the whole picture was undoubtedly better substantiated by a fuller combination of all such information (Söderhjelm 1980;Mutel et al 1998). …”

Section: Introductionmentioning

confidence: 99%

Catalogue of Algol type binary stars

Budding

Erdem

Çiçek

et al. 2004

A&A

135

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Abstract.A catalogue of (411) Algol-type (semi-detached) binary stars is presented in the form of five separate tables of information. The catalogue has developed from an earlier version by including more recent information and an improved layout. A sixth table lists (1872) candidate Algols, about which fewer details are known at present. Some issues relating to the classification and interpretation of Algol-like binaries are also discussed.

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“…1a). In this case, trapped high-energy electrons radiate most efficiently in the converging magnetic fields over the polar regions (see also Mutel et al 1998 for a similar model for the magnetic field of Algol, Fig. 1d).…”

Section: Radio Interferometric Imaging Of Stellar Coronaementioning

confidence: 81%

“…The extended structure is resolved in two oppositely polarized radio lobes in Algol that are aligned with the rotation axis (Mutel et al 1998;Fig. 1b).…”

Section: Radio Interferometric Imaging Of Stellar Coronaementioning

confidence: 99%