Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT
文献类型：期刊论文
| 作者 | Frasca, A.1; Molenda-Zakowicz, J.2; Alonso-Santiago, J.1; Catanzaro, G.1; De Cat, P.3; Fu, J. N.4; Zong, W.4; Wang, J. X.4; Cang, T.4; Wang, J. T.4,5 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2022-08-11 |
| 卷号 | 664页码:30 |
| ISSN号 | 0004-6361 |
| 关键词 | surveys techniques: spectroscopic stars: activity binaries: spectroscopic stars: fundamental parameters stars: abundances |
| DOI | 10.1051/0004-6361/202243268 |
| 英文摘要 | Aims. In this work we present the results of our analysis of 16 300 medium-resolution LAMOST spectra of late-type stars in the Kepler field with the aim of determining the stellar parameters, activity level, lithium atmospheric content, and binarity. Methods. We have used a version of the code ROTFIT specifically developed for the LAMOST medium-resolution spectra to determine stellar parameters via the adoption of a grid of spectra of real stars. We provide a catalog with the atmospheric parameters (T-eff, log g, and [Fe/H]), radial velocity (RV), and projected rotation velocity (v sin i). For cool stars (T-eff <= 6500 K), we also calculated the H alpha and Li I lambda 6708 equivalent width, which are important indicators of chromospheric activity and evolutionary stage, respectively. Results. From the sample of 16 300 spectra, we have derived the RV and atmospheric parameters for 14 300 spectra of 7443 stars. Literature data (mainly from high- or medium-resolution spectra) were used for a quality control of the results and to assess the accuracy of the derived parameters. The T-eff and log g values are in good agreement with the literature, although their distribution displays some clustering effects, which may be the result of the nonuniform distribution of the templates in the parameter space. The most relevant differences are found for [Fe/H], which appears to be overestimated for metal-poor stars; this overestimation is also likely due to the template grid. We propose a relation to correct the [Fe/H] values derived with ROTFIT. We were able to identify interesting objects, such as double-lined binaries, stars with variable RVs, lithium-rich giants, and emission-line objects. Based on the H alpha flux, we found 327 active stars. We were able to detect the Li I lambda 6708 line and measure its equivalent width for 1657 stars, both giants and stars on the main sequence. Regarding the latter, we performed a discrete age classification based on the atmospheric lithium abundance and the upper envelopes of a few open clusters. Among the giants, we found 195 Li-rich stars, 161 of which are reported here for the first time. No relationship is found between stellar rotation and lithium abundance, which allows us to rule out merger scenarios as the predominant explanation of the enrichment of Li in our sample. The fraction of Li-rich giants, approximate to 4%, is higher than expected. |
| WOS关键词 | DIGITAL SKY SURVEY ; SOLAR-TYPE STARS ; LOW-MASS STARS ; DETACHED ECLIPSING BINARY ; MEAN RADIAL-VELOCITIES ; TIME-SERIES ANALYSIS ; LITHIUM-RICH GIANTS ; ATMOSPHERIC PARAMETERS ; ROTATIONAL VELOCITIES ; OPEN CLUSTERS |
| 资助项目 | National Development and Reform Commission ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Wrocaw Centre for Networking and Supercomputing[224] ; National Natural Science Foundation of China (NSFC)[11833002] ; National Natural Science Foundation of China (NSFC)[12090040] ; National Natural Science Foundation of China (NSFC)[12090042] ; National Natural Science Foundation of China (NSFC)[11903005] ; Chinese Academy of Sciences[11833002] ; Chinese Academy of Sciences[12090040] ; Chinese Academy of Sciences[12090042] ; Chinese Academy of Sciences[11903005] ; National Aeronautics and Space Administration |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:000838820500007 |
| 资助机构 | National Development and Reform Commission ; National Development and Reform Commission ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Wrocaw Centre for Networking and Supercomputing ; Wrocaw Centre for Networking and Supercomputing ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Wrocaw Centre for Networking and Supercomputing ; Wrocaw Centre for Networking and Supercomputing ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Wrocaw Centre for Networking and Supercomputing ; Wrocaw Centre for Networking and Supercomputing ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Development and Reform Commission ; National Development and Reform Commission ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Italian Ministero dell'Istruzione, Universita e Ricerca (MIUR) ; Wrocaw Centre for Networking and Supercomputing ; Wrocaw Centre for Networking and Supercomputing ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/87649]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Frasca, A. |
| 作者单位 | 1.INAF Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy 2.Univ Wroclaw, Fac Phys & Astron, Astron Inst, Ul Kopernika 11, PL-51622 Wroclaw, Poland 3.Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium 4.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 5.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Frasca, A.,Molenda-Zakowicz, J.,Alonso-Santiago, J.,et al. Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT[J]. ASTRONOMY & ASTROPHYSICS,2022,664:30. |
| APA | Frasca, A..,Molenda-Zakowicz, J..,Alonso-Santiago, J..,Catanzaro, G..,De Cat, P..,...&Wang, J. T..(2022).Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT.ASTRONOMY & ASTROPHYSICS,664,30. |
| MLA | Frasca, A.,et al."Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT".ASTRONOMY & ASTROPHYSICS 664(2022):30. |
入库方式： OAI收割
来源：国家天文台
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