Arid
DOI10.1051/0004-6361/201630134
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
ISSN1432-0746
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
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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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