高纬度星系DFBS晚型恒星的研究

G. Kostandyan
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引用次数: 0

摘要

本文研究了第一次比拉坎巡天(FBS)数据库中发现的相对明亮的晚型巨行星。我们提出了包含新数据的第二版FBS LTS目录(FBS LTS v2), 1471个天体。它是一个均匀的、完整的高星系晚型恒星数据库,包括M型和C型。自2007年以来,所有FBS低分辨率光谱板都实现了数字化。使用FITSView和SAO图像ds9对所有DFBS光谱板进行分析,发现了许多相对较暗的LTS。我们与DFBS, USNO-B1.0, 2MASS, AllWISE, IRAS PSC/FSC, AKARI, ROSAT BSC/FSC, GCVS, SDSS进行了相互关联,并添加了更新的SIMBAD数据。对于许多新探测到的物体,我们给出了精确的DSS2位置,从DFBS低色散光谱中提炼出的近似光谱类型,从2MASS颜色中估计的亮度等级,以及1471 FBS LTS的可用适当运动。修订和更新的目录v2列出了大量全新的天体,它们有望极大地扩展对M巨星的普查,暗淡的n型AGB碳星,银河系高纬度的ch型碳巨星,以及太阳附近16.0m-17.0m的M矮星。来自卡特琳娜巡天(CSS)和全天超新星自动巡天(ASAS-SN)等大型天空变化率数据库的相位相关光曲线,以及第三次盖亚数据发布(Gaia EDR3)的早期光度和天体测量数据,已经被用来表征我们在高纬度地区发现的1100颗m型巨星和130颗c型恒星的样本。我们在Gaia DR2彩色绝对星等图(CaMD)、Gaia-2质量图(包括两个备选版本)和logp - k图中展示了我们样本恒星的行为。通过这种方式,我们探索了这些图表及其组合对lpv数据集的分析和解释的潜力。我们展示了将恒星分为M型和c型的可能性,并确定了大部分样本恒星的质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of DFBS late type stars at high galactic latitudes
We study in this thesis relatively bright late-type giants found in the First Byurakan Survey (FBS) data base. We present the 2nd version of the catalogue of FBS LTS with new data (FBS LTS v2), 1471 objects. It is a homogeneous and complete database for high- Galactic late-type stars, including M and C types. Since 2007, all FBS low-resolution spectral plates are digitized. All DFBS spectral plates are analyzed with FITSView and SAO Image ds9 and numerous relatively faint LTS were discovered. We have made cross-correlation with DFBS, USNO-B1.0, 2MASS, AllWISE, IRAS PSC/FSC, AKARI, ROSAT BSC/FSC, GCVS, SDSS and added updated SIMBAD data. For numerous new detected objects, we present accurate DSS2 positions, approximate spectral subtypes refined from the DFBS low-dispersion spectra, luminosity classes estimated from 2MASS colours, and available proper motions for 1471 FBS LTS. The Revised and Updated Catalogue v2 lists a large number of completely new objects, which promise to extend very significantly the census of M giants, faint N-type AGB carbon stars, CH-type carbon giants at high Galactic latitudes, also M dwarfs in the Solar vicinity up to 16.0m-17.0m in visual. Phase dependent light-curves from large sky area variability data bases such as Catalina Sky Survey (CSS) and All-Sky Automated Survey for Supernovae (ASAS-SN), and the early installment of the third Gaia data release (Gaia EDR3) photometric and astrometric data have been used to characterize our sample of 1100 M-type giants found and 130 C-type stars at high latitudes. We show the behaviour of our sample stars in a Gaia DR2 color–absolute magnitude diagram (CaMD), the Gaia-2MASS-diagram, including two alternative versions, and the logP-K-diagram. In this way we explore the potential of these diagrams and their combination for the analysis and interpretation of datasets of LPVs. We show the possibility to classify stars into M- and C-types and to identify the mass of the bulk of the sample stars.
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