具有可分辨磁分裂谱线的Ap星：1999--2004年平均磁场模量测量
Ap stars with resolved magnetically split lines: Mean magnetic field modulus measurements 1999--2004
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中文总结 AI 辅助
本研究通过分析1999-2004年高分辨率光谱，测量34颗Ap星的平均磁场模量<B>和视向速度，首次确定多颗星的旋转周期和轨道要素，并发现HD 47103为磁场超7.5 kG的长周期Ap星。
中文摘要 AI 辅助
磁场足够强且v sin i足够低的磁性Ap星，其谱线会分裂为磁分裂分量。这使得可以测定它们的平均磁场模量<B>。我们通过分析1999年至2004年间获得且此前未被利用的观测数据，以及在可用时的天文台档案数据，补充了34颗具有可分辨磁分裂谱线的Ap星样本的现有关于旋转磁变率和双星性质的知识。我们通过测量自然光下记录的高分辨率光谱中Fe λ6149.2 Å谱线的磁分裂和波长位移，确定了<B>值和视向速度。将我们的测量结果与已发表的结果相结合，我们表征了这两个量的变率。我们首次推导出HD 29578和HD 165474的旋转周期的准确、明确的值。我们对六颗星的旋转周期设定了从数年到数十年的下限，并确定了另外四颗星在13至33年的时间尺度上未显示出任何显著的<B>变化。我们确定HD 47103是已知第一颗旋转周期为数年且磁场显著超过7.5 kG的Ap星。我们首次确定了HD 116114、HD 142070和HD 144897的轨道要素，并改进了其他六颗双星的轨道要素。
英文摘要
Magnetic Ap stars that have a strong enough field and a sufficiently low v sin i show spectral lines resolved into their magnetically split components. This allows their mean magnetic field modulus <B> to be determined. We complement the existing knowledge of the rotational magnetic variability and of the binarity of a sample of 34 Ap stars with resolved magnetically split lines by analysing observations obtained between 1999 and 2004 that had not been exploited before and, when available, observatory archive data. We determine the values of <B> and of the radial velocity by measuring the magnetic splitting and the wavelength shift of the Fe lambda 6149.2 Å line in high-resolution spectra recorded in natural light. Combining our measurements with published ones, we characterise the variability of both quantities. We derived for the first time the accurate, unambiguous values of the rotation periods of HD 29578 and HD 165474. We set lower limits of years to decades to the rotation periods of six stars and identified four more that have not shown any significant <B> variations over timescales of 13 to 33 years. We established that HD 47103 is the first Ap star with a rotation period of years known to have a magnetic field significantly exceeding 7.5 kG. We achieved the first determination of the orbital elements of HD 116114, HD 142070, and HD 144897, and we refined the orbital elements of six other binaries.
发表机构
- European Southern Observatory（欧洲南方天文台）
- Armagh Observatory and Planetarium（阿尔马赫天文台和行星馆）
- University of Western Ontario（韦仕敦大学）
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