منابع مشابه
mesuring the staff technology readiness, the case of a multi national chemical company operating in iran
چکیده ندارد.
15 صفحه اولL dwarfs in the Hyades
We present the results of a proper motion survey of the Hyades to search for brown dwarfs, based on UKIDSS and 2MASS data. This survey covers ∼ 275 deg to a depth of K ∼ 15 mag, equivalent to a mass of ∼ 0.05 M⊙ assuming a cluster age of 625 Myr. The discovery of 12 L dwarf Hyades members is reported. These members are also brown dwarfs, with masses between 0.05 < M < 0.075 M⊙. A high proportio...
متن کاملSearching for Planets in the Hyades . I .
We describe a high-precision radial velocity search for jovian-mass companions to main sequence stars in the Hyades star cluster. The Hyades provides an extremely well controlled sample of stars of the same age, the same metallicity, and a common birth and early dynamical environment. This sample allows us to explore the dependence of the process of planet formation on only a single independent...
متن کاملNew Photometry of the Hyades
71 Tauri (= BS 1394 = vB 141 = V777 Tau) is a rapidly rotating, F0 IV–V member of the Hyades cluster. It is the second brightest X-ray source in the cluster, after V471 Tauri, and an intensely bright coronal EUV source (Stern et al. 1995). It is a lunar occultation binary, but the secondary star (estimated by Peterson et al. 1981 to be a G4 V star in possibly a 53 day orbit) has never been seen...
متن کاملStellar Nucleosynthesis in the Hyades Open Cluster
We report a comprehensive light element (Li, C, N, O, Na, Mg, and Al) abundance analysis of three solar-type main sequence (MS) dwarfs and three red giant branch (RGB) clump stars in the Hyades open cluster using highresolution and high signal-to-noise spectroscopy. The abundances have been derived in a self-consistent fashion, and for each group (MS or RGB), the CNO abundances are found to be ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2006
ISSN: 0004-6256,1538-3881
DOI: 10.1086/497968