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| 題名: | Towards a complete stellar mass function of the Hyades: I. Pan-STARRS1 optical observations of the low-mass stellar content |
| 作者: | 陳文屏;Goldman, B.;Röser, S.;Schilbach, E.;Magnier, E. A.;Olczak, C.;Henning, T.;Jurić, M.;Schlafly, E.;Chen, W. P.;Platais, I.;Burgett, W.;Hodapp, K.;Heasley, J.;Kudritzki, R. P.;Morgan, J. S.;Price, P. A.;Tonry, J. L.;Wainscoat, R. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Algorithms;Clusters;Contamination;Photometry;Searching;Segregations;Signatures;Three dimensional |
| 日期: | 2013-11-18 |
| 上傳時間: | 2026-04-21 14:22:20 (UTC+8) |
| 出版者: | EDP Sciences |
| 摘要: | 摘要： Aims. The Hyades duster is an ideal target to study the dynamical evolution of a star cluster over the entire mass range due to its intermediate age and proximity to the Sun. Methods. We wanted to extend the Hyades mass function towards lower masses down to 0.1 M sub([middot in circle]) and to use the full three-dimensional spatial information to characterize the dynamical evolution of the cluster. Results. We performed a kinematic and photometric selection using the PPMXL and Pan-STARRS1 sky surveys, to search for cluster members up to 30 pc from the cluster centre. We determined our detection efficiency and field star contamination rate to derive the cluster luminosity and mass functions down to masses of 0.1 M sub([middot in circle]). The thorough astrometric and photometric constraints minimized the contamination. A minimum spanning tree algorithm was used to quantify the mass segregation. Conclusions. We discovered 43 new Hyades member candidates with velocity perpendicular to the Hyades motion up to 2 km s super(-1). They have mass estimates between 0.43 and 0.09 M sub([middot in circle]), for a total mass of 10 M sub([middot in circle]). This doubles the number of Hyades candidates with masses smaller than 0.15 M sub([middot in circle]). We provide an additional list of 11 possible candidates with velocity perpendicular to the Hyades motion up to 4 km s super(-1). The cluster is significantly mass segregated. The extension of the mass function towards lower masses provided an even clearer signature than estimated in the past. We also identified as likely Hyades member an L0 dwarf previously assumed to be a field dwarf. Finally we question the membership of a number of previously published candidates, including a L2.5-type dwarf.
出版日期： 2013-11-01
出處： Astronomy and astrophysics (Berlin), 2013-11, Vol.559, p.A43-np
資源來源： EDP Sciences
識別號： ISSN: 0004-6361
識別號： EISSN: 1432-0746
識別號： DOI: 10.1051/0004-6361/201321727 |
| 顯示於類別: | [天文研究所] 期刊論文
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