Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1051/0004-6361/201630134 |
A survey for low-mass stellar and substellar members of the Hyades open cluster | |
Melnikov, Stanislav1,2; Eisloeffel, Jochen1 | |
通讯作者 | Melnikov, Stanislav |
来源期刊 | ASTRONOMY & ASTROPHYSICS
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ISSN | 1432-0746 |
出版年 | 2018 |
卷号 | 611 |
英文摘要 | Context. Unlike young open clusters (with ages < 250 Myr), the Hyades cluster (age similar to 600 Myr) has a clear deficit of very low-mass stars (VLM) and brown dwarfs (BD). Since this open cluster has a low stellar density and covers several tens of square degrees on the sky, extended surveys are required to improve the statistics of the VLM/BD objects in the cluster. Aims. We search for new VLM stars and BD candidates in the Hyades cluster to improve the present-day cluster mass function down to substellar masses. Methods. An imaging survey of the Hyades with a completeness limit of 21.(m)5 in the R band and 20.(m)5 in the I band was carried out with the 2k x 2k CCD Schmidt camera at the 2 m Alfred Jensch Telescope in Tautenburg. We performed a photometric selection of the cluster member candidates by combining results of our survey with 2MASS JHK(s) photometry. Results. We present a photometric and proper motion survey covering 23.4 deg(2) in the Hyades cluster core region. Using optical/IR colour-magnitude diagrams, we identify 66 photometric cluster member candidates in the magnitude range 14.(m)7 < I < 20.(m)5. The proper motion measurements are based on several all-sky surveys with an epoch difference of 60-70 yr for the bright objects. The proper motions allowed us to discriminate the cluster members from field objects and resulted in 14 proper motion members of the Hyades. We rediscover Hy 6 as a proper motion member and classify it as a substellar object candidate (BD) based on the comparison of the observed colour-magnitude diagram with theoretical model isochrones. Conclusions. With our results, the mass function of the Hyades continues to be shallow below similar to 0.15 M-circle dot indicating that the Hyades have probably lost their lowest mass members by means of dynamical evolution. We conclude that the Hyades core represents the "VLM/BD desert" and that most of the substeller objects may have already left the volume of the cluster. |
英文关键词 | stars: low-mass open clusters and associations: individual: Hyades brown dwarfs stars: luminosity function, mass function |
类型 | Article |
语种 | 英语 |
国家 | Germany ; Uzbekistan |
收录类别 | SCI-E |
WOS记录号 | WOS:000427920100003 |
WOS关键词 | AURIGA MOLECULAR CLOUD ; BROWN DWARFS ; COMA BERENICES ; STAR CLUSTER ; EVOLUTIONARY MODELS ; LUMINOSITY FUNCTION ; ATMOSPHERES ; PHOTOMETRY ; PRAESEPE ; DYNAMICS |
WOS类目 | Astronomy & Astrophysics |
WOS研究方向 | Astronomy & Astrophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/207846 |
作者单位 | 1.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany; 2.Ulugh Beg Astron Inst, Astron Str 33, Tashkent 700052, Uzbekistan |
推荐引用方式 GB/T 7714 | Melnikov, Stanislav,Eisloeffel, Jochen. A survey for low-mass stellar and substellar members of the Hyades open cluster[J],2018,611. |
APA | Melnikov, Stanislav,&Eisloeffel, Jochen.(2018).A survey for low-mass stellar and substellar members of the Hyades open cluster.ASTRONOMY & ASTROPHYSICS,611. |
MLA | Melnikov, Stanislav,et al."A survey for low-mass stellar and substellar members of the Hyades open cluster".ASTRONOMY & ASTROPHYSICS 611(2018). |
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