Die Veränderlichen 78. 1905 Virginis und Y Virginis
نویسندگان
چکیده
منابع مشابه
The fundamental parameters of the Ap star 78 Virginis
Context. Determining the effective temperature of Ap stars, including the roAp stellar pulsators, is a difficult task owing to their strong magnetic field and their related spotted surfaces. It is, however, an important step towards constraining models of their complex atmosphere and testing proposed pulsation excitation mechanisms. Aims. Using the unique angular resolution provided by long-bas...
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The spectrophotometric variability of the magnetic CP star CU Vir in the spectral region from 1150 Å to 7850 Å is investigated. This study is based on the archival IUE and published visual spectrophotometric data obtained at different phases of the rotational cycle. The light variations in the wavelength region longer than λ 2000 Å are generally in antiphase to the variations in the shorter wav...
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The magnetic chemically peculiar star CU Virginis is a unique astrophysical laboratory for stellar magnetospheres and coherent emission processes. It is the only known main sequence star to emit a radio pulse every rotation period. Here we report on new observations of the CU Virginis pulse profile in the 13 and 20 cm radio bands. The profile is known to be characterised by two peaks of 100% ci...
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The surface magnetic field configuration of the Ap star HD 118022 (78 Vir) has been reconstructed in the framework of the magnetic charge distribution (MCD) method from the analysis of Stokes IQU V spectra obtained using the MuSiCoS spectropolarimeter at Pic du Midi Observatory. Magnetically-sensitive Fe ii lines were primarily employed in the analysis, supposing that iron is evenly distributed...
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This paper presents the modeling of the F9 V star β Virginis based on seismological measurements. Using the Geneva evolution code including rotation and atomic diffusion, we find that two distinct solutions reproduce all existing asteroseismic and non-asteroseismic observational constraints well: a main-sequence model with a mass of 1.28 ± 0.03 M⊙ and an age t = 3.24 ± 0.20 Gyr, or a model in t...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1905
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19051690704