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| 題名: | Characterization of the praesepe star cluster by photometry and proper motions with 2MASS, PPMXL, and Pan-STARRS |
| 作者: | 陳文屏;Wang, P. F.;Chen, W. P.;Lin, C. C.;Pandey, A. K.;Huang, C. K.;Panwar, N.;Lee, C. H.;Tsai, M. F.;Tang, C.-H.;Goldman, B.;Burgett, W. S.;Chambers, K. C.;Draper, P. W.;Flewelling, H.;Grav, T.;Heasley, J. N.;Hodapp, K. W.;Huber, M. E.;Jedicke, R.;Kaiser, N.;Kudritzki, R.-P.;Luppino, G. A.;Lupton, R. H.;Magnier, E. A.;Metcalfe, N.;Monet, D. G.;Morgan, J. S.;Onaka, P. M.;Price, P. A.;Stubbs, C. W.;Sweeney, W.;Tonry, J. L.;Wainscoat, R. J.;Waters, C. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;Clusters;Disks;Dynamical systems;EVAPORATION;GALAXIES;Inclusions;LUMINOSITY;MASS;PHOTOMETRY;PROPER MOTION;SEGREGATION;Segregations;STAR CLUSTERS;STARS;STRIPPING;TELESCOPES |
| 日期: | 2014-03-20 |
| 上傳時間: | 2026-04-21 14:26:44 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States |
| 摘要: | 摘要： Membership identification is the first step in determining the properties of a star cluster. Low-mass members in particular could be used to trace the dynamical history, such as mass segregation, stellar evaporation, or tidal stripping, of a star cluster in its Galactic environment. We identified member candidates of the intermediate-age Praesepe cluster (M44) with stellar masses ~0.11-2.4 M sub([middot in circle]), using Panoramic Survey Telescope And Rapid Response System and Two Micron All Sky Survey photometry, and PPMXL proper motions. Within a sky area of 3[degrees] radius, 1040 candidates are identified, of which 96 are new inclusions. Using the same set of selection criteria on field stars, an estimated false positive rate of 16% was determined, suggesting that 872 of the candidates are true members. This most complete and reliable membership list allows us to favor the BT-Settl model over other stellar models. The cluster shows a distinct binary track above the main sequence, with a binary frequency of 20%-40%, and a high occurrence rate of similar mass pairs. The mass function is consistent with that of the disk population but shows a deficit of members below 0.3 solar masses. A clear mass segregation is evidenced, with the lowest-mass members in our sample being evaporated from this disintegrating cluster.
出版者： United States
出版日期： 2014-03-20
出處： The Astrophysical journal, 2014-03, Vol.784 (1), p.57-10
資源來源： IOP Journals
識別號： ISSN: 0004-637X
識別號： ISSN: 1538-4357
識別號： EISSN: 1538-4357
識別號： DOI: 10.1088/0004-637X/784/1/57 |
| 顯示於類別: | [天文研究所] 期刊論文
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