AI 中文总结
该研究通过ProtoPol光谱偏振仪对21颗赫比格Ae/Be星和经典Be星开展28个月多历元监测，发现经典Be星Hα偏振稳定、多数赫比格星偏振显著变，构建了罕见的长跨度光谱偏振数据集。
AI 中文摘要
发射线特征处的偏振信号及其时间演化，是探测天体物理源星周环境的有力工具，其空间尺度是直接成像技术无法触及的。然而，光谱偏振测量对光子的需求极高，导致文献中此类数据集的可用性受到极大限制。本研究报道了一项针对赫比格Ae/Be星和经典Be星样本的多历元光谱偏振监测项目，初始观测在ProtoPol（一台新研发的中分辨率 echelle 光谱偏振仪，安装于印度阿布山物理研究实验室（PRL）2.5米望远镜上）的调试与性能验证阶段完成。鉴于此类天体的可比数据集数量有限，研究团队在超过28个月（2023年12月至2026年3月）内对相同目标进行了多次后续观测，以探究其偏振特性的时间行为。样本包含11颗赫比格Ae/Be星和10颗经典Be星。观测发现，经典Be星的Hα偏振保持相对稳定，而样本中大多数赫比格星则表现出显著的变异性。本文呈现的观测结果是罕见的、跨度超过两年的多历元光谱偏振数据集之一，应会受到更广泛天文界的关注。本文是由两部分样本研究组成的系列论文的第一部分，第二部分将呈现共生星和红巨星的对应结果。
英文摘要
Polarization signatures across emission line features, together with their temporal evolution, offer a powerful probe of the circumstellar environments of astrophysical sources, on spatial scales otherwise inaccessible to direct imaging techniques. However, the photon-hungry nature of spectro-polarimetry has significantly limited the availability of such datasets in the literature. This work reports a multi-epoch spectro-polarimetric monitoring campaign targeting a sample of Herbig Ae/Be and classical Be stars. The initial observations were obtained during the commissioning and performance-verification phase of ProtoPol, a recently developed medium-resolution echelle spectro-polarimeter mounted on the Physical Research Laboratory (PRL) 2.5m telescope, Mt Abu, India. Given the limited number of comparable datasets available for this class of objects, follow-up observations of the same targets were carried out repeatedly over more than 28 months (December 2023-March 2026), enabling an investigation of the temporal behavior of their polarimetric properties. Our sample comprises 11 Herbig Ae/Be stars and 10 classical Be stars. Our observations found that, while the H$α$ polarization remained relatively constant for the classical Be stars, they showed significant variability for most of the Herbig stars in the sample. The observations presented here constitute one of the rare multi-epoch spectro-polarimetric datasets spanning more than two years and should be of considerable interest to the broader astronomical community. This paper is Part-I of a two-part series of sample studies; corresponding results for symbiotic and red giant stars are presented in Part-II.
Comments24 pages, 10 figures. The manuscript has been accepted for publication in the Astronomical Journal (AJ)
