New Light on Galactic Astronomy Based on the Hipparcos Catalog

基于依巴谷星表的银河天文学新曙光

• 批准号: 09640328
• 负责人: CHIBA Masashi
• 金额: $ 1.92万
• 依托单位: National Astronomical Observatory
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640328/
• 关键词: Galactic Astronomy; Hipparcos Satellite; Galactic Structure; Galactic Evolution; Cosmology; ヒッパルコス

The Hipparcos mission was the first space experiment dedicated to astrometry, and was accepted within the ESA scientific program in 1980. The primary objective of the mission was the determination of accurate astrometric data - positions, annual proper motions and absolute trigonometric parallaxes, at levels of I milliarcsec - for about 120000 stars. The Hipparcos Catalogue, the primary result of the observations and reduction of the satellite-acquired data, has provided great impacts on various research fields that include positional astronomy, stellar evolution, galactic astronomy, and cosmology.Among the whole sample in the catalogue, the astrometric observations of RR Lyrae variables and metal-deficient red giants have been parts of the Hipparcos program assigned to our research group. Analyzing the data of these stars which arrived us prior to the release of the catalogue, we have found that (1) ages of old globular clusters, calibrated from the absolute magnitudes of RR Lyrae var … More iables, put severe limits on the range of cosmological parameters, and that (2) the formation of the Galaxy from the halo to disk components, as probed by kinematics of metal-poor stars, involved the slow collapse lasting several billion years.We have also conducted the assembly of spectroscopic and photometric information for numerous metal-poor stars, for the purpose of studying early dynamical evolution of the Galaxy in the cosmological context. This is mainly because in recent years, the numbers of recognized stars with metal abundances significantly less than solar has grown enormously. So too has the quality and quantity of information available concerning their detailed abundances, velocities, and proper motions. Using newly determined (and/or refined) proper motions for over 1000 of these stars, based on results from the Hipparcos mission and various catalogs including the Southern Proper Motion catalog, the Northern Proper Motion catalog, the Astrographic Catalog, and the Digital Sky Survey obtained at STScI, we have arrived at the comprehensive view of the kinematics of the thick disk and halo components of the Galaxy. A number of interesting differences were also found between the observed properties of our non-kinematically selected sample, as compared with similar-sized, but kinematically biased samples of metal-poor stars. Less

依巴谷使命任务是第一个专门用于天体测量的空间实验，并于1980年被欧空局科学方案接受。该使命的主要目标是确定准确的天体测量数据-位置，年度自行和绝对三角视差，在1毫弧秒的水平-约120000颗恒星。依巴谷星表是卫星观测和数据处理的主要成果，对位置天文学、恒星演化、星系天文学和宇宙学等领域的研究产生了重要影响，其中对天琴座RR型变星和缺金属红巨星的天体测量观测是本课题组依巴谷计划的一部分。通过分析这些在星表公布之前到达的恒星的数据，我们发现：（1）用天琴座RR的绝对星等标定的老球状星团的年龄 ...更多信息 （2）银河系从晕到盘的形成，如贫金属恒星的运动学所探测的，涉及持续数十亿年的缓慢坍缩。我们还对许多贫金属恒星进行了光谱和光度信息的汇编，目的是在宇宙学背景下研究银河系早期的动力学演化。这主要是因为近年来，金属丰度明显低于太阳的恒星数量大幅增加。关于它们的详细丰度、速度和自行的信息的质量和数量也在增加。使用新确定的（和/或改进的）自行超过1000这些恒星，根据结果从依巴谷使命和各种目录，包括南部自行目录，北方自行目录，天文学目录，并在STScI获得的数字巡天，我们已经达到了全面的看法厚盘和晕组成部分的银河系的运动学。一些有趣的差异也发现我们的非运动学选择的样品，与类似大小的，但运动学偏置的样品的贫金属恒星之间的观察到的属性。少

项目成果

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Chiba，Futamase：“QSO 透镜和宇宙学参数的统计”，理论物理进展增刊（1999 年）。

千葉、吉井: "Early evolution of the Galactic halo revealed from Hipparcos observations of metal-poor stars" The Astronomical Journal. 115. 168-192 (1998)

Chiba, Yoshii：“依巴谷对贫金属恒星的观测揭示了银河晕的早期演化”《天文学杂志》115. 168-192 (1998)。

Chiba, M.& Yoshii, Y.: ""Three-dimensional orbits of metal-poor halo stars and the formation of the Galaxy"" ApJ Let.490. 73-76 (1997)

千叶，M.

矢野、郷田: "Evolution of the power spectrum and self-similarity in the expanding one-dimensional universe" The Astrophysical Journal Supplement. 118. 267-274 (1998)

Yano, Goda：“膨胀一维宇宙中的功率谱和自相似性的演化”《天体物理学杂志增刊》118. 267-274 (1998)。

宮本、朱: "Galactic interior motions derived from Hipparcos proper motions. I.Young disk population" The Astronomical Journal. 115. 1483-1491 (1998)

Miyamoto, Shu：“源自依巴谷自行运动的银河系内部运动。I.Young 盘族”《天文学杂志》115。1483-1491 (1998)。