Gaia 数据第三批发布：主序 OBAF 型恒星中的脉动
太阳与恒星天体物理
2023-06-21 v2
摘要
Gaia 第三批数据发布提供了约一千万颗恒星长达 34 个月的测光时间序列。对于其中许多恒星，还提供了傅里叶空间中的表征及其变星分类。本文聚焦于光谱型为 O、B、A 或 F 的中到高质量（IHM）主序脉动星（M >= 1.3 Msun），即已知的 beta Cep、慢脉动 B 型（SPB）、delta Sct 和 gamma Dor 星。这些恒星常具多周期性且振幅低，使用稀疏时间序列分析颇具挑战。本分析使用的所有数据集均为 Gaia DR3 数据发布的一部分。测光时间序列用于进行傅里叶分析，而经验不稳定带所需的全局天体物理参数取自 Gaia DR3 gspphot 表，vsini 数据取自 Gaia DR3 esphs 表。我们表明，对于邻近的 OBAF 型脉动星，Gaia DR3 数据足够精确和准确，可将其定位至赫罗图中。我们发现经验不稳定带覆盖的区域比理论预测更宽。特别地，我们的研究揭示了条带外存在快速旋转的重力模脉动星，以及如前文献所报道的条带内同时存在转动调制变星。我们推导了 delta Sct 星广泛的周期-光度关系，并提供证据表明该关系依据振荡周期呈现不同区域。最后，我们展示了恒星转动如何衰减 delta Sct 星主导振荡模式的振幅。
引用
@article{arxiv.2206.06075,
title = {Gaia Data Release 3: Pulsations in main sequence OBAF-type stars},
author = {Gaia Collaboration and J. De Ridder and V. Ripepi and C. Aerts and L. Palaversa and L. Eyer and B. Holl and M. Audard and L. Rimoldini and A. G. A. Brown and A. Vallenari and T. Prusti and J. H. J. de Bruijne and F. Arenou and C. Babusiaux and M. Biermann and O. L. Creevey and C. Ducourant and D. W. Evans and R. Guerra and A. Hutton and C. Jordi and S. A. Klioner and U. L. Lammers and L. Lindegren and X. Luri and F. Mignard and C. Panem and D. Pourbaix and S. Randich and P. Sartoretti and C. Soubiran and P. Tanga and N. A. Walton and C. A. L. Bailer-Jones and U. Bastian and R. Drimmel and F. Jansen and D. Katz and M. G. Lattanzi and F. van Leeuwen and J. Bakker and C. Cacciari and J. Castañeda and F. De Angeli and C. Fabricius and M. Fouesneau and Y. Frémat and L. Galluccio and A. Guerrier and U. Heiter and E. Masana and R. Messineo and N. Mowlavi and C. Nicolas and K. Nienartowicz and F. Pailler and P. Panuzzo and F. Riclet and W. Roux and G. M. Seabroke and R. Sordo and F. 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journal= {arXiv preprint arXiv:2206.06075},
year = {2023}
}