منابع مشابه
Photometry of the Old Open Cluster Berkeley 17
Photometric UBVI CCD photometry is presented for NGC 188 and Berkeley 17. Color-magnitude diagrams (CMDs) are constructed and reach well past the mainsequence turn-off for both clusters. Cluster ages are determined by means of isochrone fitting to the cluster CMDs. These fits are constrained to agree with spectroscopic metallicity and reddening estimates. Cluster ages are determined to be 7.0 ±...
متن کاملBerkeley 29 , the most distant old open cluster
We present CCD BVI photometry of the old open cluster Berkeley 29, located in the anticentre direction. Using the synthetic Colour Magnitude Diagrams technique we estimate at the same time its age, reddening, distance, and approximate metallicity using three types of stellar evolutionary tracks. The best solutions give: age=3.4 or 3.7 Gyr, (m-M)0 = 15.6 or 15.8 with E(B–V) = 0.13 or 0.10, and m...
متن کاملBerkeley 22 , an old and distant open cluster towards the Galactic anticentre
We present deep CCD BV I photometry of the distant, old open cluster Berkeley 22, covering from the red giants branch (RGB) to about 6 magnitudes below the main sequence (MS) turn-off. Using the synthetic Colour Magnitude Diagram method with three different types of stellar evolutionary tracks, we estimate values and theoretical uncertainty of distance modulus (m-M)0, reddening E(B−V ) , age τ ...
متن کاملA Super Lithium Rich giant in the metal - poor open cluster Berkeley 21 ?
We present the analysis of FEROS commissioning spectra of 3 giants in the metal poor cluster Be 21. One of the giants has an exceptionally high Li content, comparable to the original Li in the solar system. These objects are very rare (only a handful are known), and this is the first Super Lithium Rich giant (SLIR) discovered in an open cluster. The reasons for such a high Li abundance are unkn...
متن کاملMembership and lithium in the old , metal – poor open cluster Berkeley 32 ⋆
Context. Measurements of lithium (Li) abundances in open clusters provide a unique tool for following the evolution of this element with age, metallicity, and stellar mass. In spite of the plethora of Li data already available, the behavior of Li in solar–type stars has so far been poorly understood. Aims. Using FLAMES/Giraffe on the VLT, we obtained spectra of 157 candidate members of the old,...
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: 2012
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/143/2/46