High-resolution abundance analysis of HD 140283

Automatic abundance analysis of high resolution spectra

We describe an automatic procedure for determining abundances from high resolution spectra. Such procedures are becoming increasingly important as large amounts of data are delivered from 8m telescopes and their high-multiplexing fiber facilities, such as FLAMES on ESO-VLT. The present procedure is specifically targeted for the analysis of spectra of giants in the Sgr dSph; however, the procedu...

Study of the Element Abundances in Hd 140283: the Abundance Robustness of the Weak R- and Main Process Stars

As a brief revision, the origin of heavy elements and the role of abundances in extremely metal-poor (EMP) stars are presented. Heavy element abundances in the EMP uranium-rich star CS 31082-001 based mainly on near-UV spectra from STIS/HST are presented. These results should be useful for a better characterisation of the neutron exposure(s) that produced the r-process elements in this star, as...

The puzzling abundance pattern of HD 134439 and HD 134440 ⋆

Abundances of 18 elements are determined for the common proper-motion pair, HD134439 and HD 134440, which shows high [Mn/Fe] and low [α/Fe] ratios as compared to normal halo stars. Moreover, puzzling abundances are indicated from elements whose origins are normally considered to be from the same nucleosynthesis history. Particularly, we have found that [Mg/Fe] and [Si/Fe] are lower than [Ca/Fe]...

The Isotopi Mixture of Barium in the Metal - poorSubgiant HD 140283

بررسی حساسیت و اختصاصیت روش high resolution melting analysis در شناسایی انواع جهش های مختلف ژن rb1

روش های متنوعی برای شناسایی جهش ها ابداع شده است که هریک از آنها دارای مزایا و معایب خاص خود هستند. یکی از روش هایی که اخیراً ابداع شده و در مطالعات مختلف به کارآیی بالای آن اشاره شده است روش high resolution melting analysis یا hrm است. در مطالعه حاضر برای اولین بار در ایران به منظور شناسایی جهش ها تمامی اگزون های ژن rb1 با استفاده از روش تعیین توالی بررسی شده است. در ادامه به منظور بررسی حساسیت...