The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
A. Sota, J. Maíz Apellániz, N. R. Walborn, E. J. Alfaro, R. H. Barbá, N. I. Morrell, R. C. Gamen, J. I. Arias
备注:
Accepted for publication in ApJS. 73 pages and 20 figures. Figure 19 is shown at a degraded resolution due to arXiv limitations. If interested in the high-resolution version, please contact the author
我们提出了银河系O星的大规模光谱调查的第一部分,基于新的,高信噪比,R~2500数字观测从两个半球的银河系O星目录中选择的Maíz Apellániz等(2004)和Sota等(2008)。光谱分类系统进行了重新讨论,并提出了一个新的图集,取代以前的版本。给出了异常对象的广泛序列,包括Ofc、ON/OC、Onfp、Of?p,Oe和双线分光双星。剩余的正常光谱使第一个样本达到184颗恒星,接近B=8和delta = -20以北,包括Maíz Apellániz et al.(2004)中仍然被归类为O星的所有北方天体。由于数据和分析程序的质量、数量和同质性,这些分类的系统和随机准确性大大高于以前可达到的准确性。这些结果将促进银河系天文学和恒星天体物理学的后续研究。在未来,我们将发表调查的其余部分,从Maíz Apellániz et al.(2004)的第二篇论文开始,该论文将包括大多数南方恒星。
英文摘要:
We present the first installment of a massive spectroscopic survey of Galactic O stars, based on new, high signal-to-noise ratio, R~2500 digital observations from both hemispheres selected from the Galactic O-Star Catalog of Maíz Apellániz et al. (2004) and Sota et al. (2008). The spectral classification system is rediscussed and a new atlas is presented, which supersedes previous versions. Extensive sequences of exceptional objects are given, including types Ofc, ON/OC, Onfp, Of?p, Oe, and double-lined spectroscopic binaries. The remaining normal spectra bring this first sample to 184 stars, which is close to complete to B=8 and north of delta = -20 and includes all of the northern objects in Maíz Apellániz et al. (2004) that are still classified as O stars. The systematic and random accuracies of these classifications are substantially higher than previously attainable, because of the quality, quantity, and homogeneity of the data and analysis procedures. These results will enhance subsequent investigations in Galactic astronomy and stellar astrophysics. In the future we will publish the rest of the survey, beginning with a second paper that will include most of the southern stars in Maíz Apellániz et al. (2004).
Detection of a White Dwarf companion to a Blue Straggler Star in the outskirts of globular cluster NGC 5466 with the Ultraviolet Imaging Telescope (UVIT)
Mapping Milky Way Halo Substructure using Stars in the Extended Blue Tail of the Horizontal Branch
虽然蓝水平支(BHB)星通常被用来追踪晕子结构,但蓝于(g-r)<-0.3的恒星由于其绝对星等难以确定而被忽略。水平支蓝区包括BHB尾星和极水平支星。我们提出了一种方法,用于识别HBX星在现场,使用光谱和测光从斯隆数字巡天数据发布14(SDSS DR 14)。我们推导出BHB尾星和EHB星的绝对星等作为颜色函数的估计值,并使用这种关系来计算距离。我们确定了一个过度密集的HBX恒星,似乎是追踪武仙座-天鹰座云(HAC)的北端。我们确定了三颗可能是潮汐流的一部分的恒星,但这还不足以解释观测到的过密度。结合SDSS数据与盖亚DR 2自行允许我们表明,大多数HBX恒星的轨道在过密度是在高偏心率轨道上类似于室女座径向合并/盖亚-土卫二/盖亚香肠结构,并且高偏心率轨道的过密度一直延伸到室女座过密度。我们利用恒星运动学将HBX星分为盘星和晕星。晕星主要在高偏心率(径向)轨道上。HBX星的比例是EHB是最高的磁盘人口和最低的低偏心率晕星。
Science with the Galactic O-Star Spectroscopic Survey (GOSSS) : The relationship between DIBs, ISM, and extinction
在这张海报中,我们展示了我们对DIB(弥散星际带)和其他星际吸收线的初步分析,目的是了解它们的起源及其与灭绝的关系。我们使用了有史以来最大的银河系O星蓝紫光谱样本(GOSSS,见Maíz Apellániz在这次会议上的贡献)。这个样本允许一个新的见解,因为足够的O-星光谱,样本数量(700和增加,400在这里使用),和他们的分布在MW盘。我们确认了不同DIB和E(B-V)之间的高相关系数,尽管每种情况的详细行为显示出微小的差异。我们还检测到Ca II λ3934(Ca K)和E(B-V)之间的适度低的相关系数,其具有特殊的空间分布,我们将其归因于Ca II λ3934的线饱和度和速度剖面之间的关系。
photoD with Rubin's Data Preview 1: first stellar photometric distances and deficit of faint blue stars. Stellar distances with Rubin's DP1
Ruđer Bošković Institute(鲁杰尔·博什科维奇研究所);XV. Gymnasium (MIOC)(第十五中学(MIOC));Vera C. Rubin Observatory Project Office(薇拉·C·鲁宾天文台项目办公室);University of Washington(华盛顿大学);Faculty of Physics, University of Rijeka(里耶卡大学物理学院);Institute for Data-intensive Research in Astrophysics and Cosmology, University of Washington(华盛顿大学天体物理学与宇宙学数据密集型研究所);McWilliams Center for Cosmology & Astrophysics, Department of Physics, Carnegie Mellon University(卡内基梅隆大学物理学院麦克威廉姆斯宇宙学与天体物理学中心)
The miniJPAS survey: Dissecting galaxy properties across environments with spatially resolved photometry
Universidade Federal de Santa Catarina(圣卡塔琳娜联邦大学);University of Heidelberg(海德堡大学);Instituto de Física de Cantabria (CSIC-UC)(坎塔布里亚物理研究所);Unidad Asociada “Grupo de Astrofísica Extragaláctica y Cosmología”, IFCA-CSIC/Universitat de València(IFCA-CSIC/瓦伦西亚大学联合单位“河外天体物理学与宇宙学组”);Instituto de Física, Universidade de São Paulo(圣保罗大学物理研究所);Observatório Nacional – MCTI (ON)(国家天文台);Donostia International Physics Center (DIPC)(圣塞巴斯蒂安国际物理中心);IKERBASQUE, Basque Foundation for Science(伊克尔巴斯克,巴斯克科学基金会);Centro de Estudios de Física del Cosmos de Aragón (CEFCA)(阿拉贡宇宙物理学研究中心)