A spectroscopic and proper motion search of Sloan Digital Sky Survey: red subdwarfs in binary systems
文献类型：期刊论文
| 作者 | Zhang, Z. H.1,2,3; Pinfield, D. J.1; Burningham, B.1; Jones, H. R. A.1; Galvez-Ortiz, M. C.1,4; Catalan, S.1; Smart, R. L.3; Lepine, S.5; Clarke, J. R. A.1,6; Pavlenko, Ya V.1,7 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-09-01 |
| 卷号 | 434期号:2页码:1005-1027 |
| 关键词 | brown dwarfs stars: carbon stars: late-type stars: Population II subdwarfs Galaxy: halo |
| 英文摘要 | Red subdwarfs in binary systems are crucial for both model calibration and spectral classification. We search for red subdwarfs in binary systems from a sample of high proper motion objects with Sloan Digital Sky Survey spectroscopy. We present here discoveries from this search, as well as highlight several additional objects of interest. We find 30 red subdwarfs in wide binary systems including: two with spectral type of esdM5.5, 6 companions to white dwarfs and 3 carbon-enhanced red subdwarfs with normal red subdwarf companions. 15 red subdwarfs in our sample are partially resolved close binary systems. With this binary sample, we estimate the low limit of the red subdwarf binary fraction of similar to 10 per cent. We find that the binary fraction goes down with decreasing masses and metallicities of red subdwarfs. A spectroscopic esdK7 subdwarf + white dwarf binary candidate is also reported. 30 new M subdwarfs have spectral type of >= M6 in our sample. We also derive relationships between spectral types and absolute magnitudes in the optical and near-infrared for M and L subdwarfs, and we present an M subdwarf sample with measured U, V, W space velocities. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | LOW-MASS STARS ; EXTRASOLAR GIANT PLANETS ; COOLEST EXTREME SUBDWARF ; M TELESCOPE PROGRAM ; DWARF CARBON STAR ; K-BAND SPECTRA ; WHITE-DWARFS ; SOLAR NEIGHBORHOOD ; ULTRACOOL SUBDWARFS ; BROWN DWARFS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000323638200008 |
| 源URL | [http://119.78.226.72/handle/331011/18025]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Hertfordshire, Sci & Technol Res Inst, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Osserv Astron Torino, Ist Nazl Astrofis, I-10025 Pino Torinese, Italy 4.Ctr Astrobiol CSIC INTA, E-28850 Madrid, Spain 5.Amer Museum Nat Hist, Div Phys Sci, Dept Astrophys, New York, NY 10024 USA 6.Univ Valparaiso, Dept Fis & Astron, Valparaiso, Chile 7.Ukrainian Acad Sci, Main Astron Observ, UA-03680 Kiev, Ukraine |
| 推荐引用方式 GB/T 7714 | Zhang, Z. H.,Pinfield, D. J.,Burningham, B.,et al. A spectroscopic and proper motion search of Sloan Digital Sky Survey: red subdwarfs in binary systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(2):1005-1027. |
| APA | Zhang, Z. H..,Pinfield, D. J..,Burningham, B..,Jones, H. R. A..,Galvez-Ortiz, M. C..,...&Sipocz, B..(2013).A spectroscopic and proper motion search of Sloan Digital Sky Survey: red subdwarfs in binary systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(2),1005-1027. |
| MLA | Zhang, Z. H.,et al."A spectroscopic and proper motion search of Sloan Digital Sky Survey: red subdwarfs in binary systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.2(2013):1005-1027. |
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