S Dor-Type Variables in Other Galaxies

metallicity of starburst galaxies in chandra deep field south (cdf-s) , at 0.5

چکیده یکی از پارامترهای اصلی در دنبال کردن تاریخچه ی تشکیل ستاره ها و تحول کهکشان ها، مطالعه ی میزان فراوانی عناصر آن ها است. در این پایان نامه برای مطالعه ی همبستگی میان فراوانی فلزی و جرم ستاره ای کهکشان ها، از داده های طیفی 89 کهکشانِ ستاره زا استفاده شده است. طیف ها توسط طیف نگار فورس2 از میدان ژرف جنوبی چاندرا گرفته شده و جابه جایی به سرخ طیف ها همه بزرگتر از نیم و کوچکتر از یک هستند. جر...

on Shimony ’ s “ An Analysis of Stapp ’ s ‘ A bell - type theorem without hidden variables ’ ”

Other ( S )

Introduction The present text attempts to approach the work through the aspects that make it different, rather than those that make it familiar. The five themes that made up the essential experimental material at the disposal of the psychologists constitute the familiar aspects of The Angel of Death. We will strive to interpret the work on the basis of all the elements that fall outside the the...

HI in Early-type Galaxies

We summarise the HI properties of early-type galaxies, in particular the differences in HI morphologies observed in early-type galaxies of different luminosities. We find that in low-luminosity early-type galaxies the HI is almost always in a disk-like structure, with central surface densities high enough for star formation to occur. In a few luminous early-type galaxies the HI is also in a dis...

RRLyrae variables in globular clusters and nearby galaxies

I point out that the Oosterhoff dichotomy for globular cluster and field RRLyrae stars may place the strongest constraints so far on the number of dwarf spheroidal-like protogalactic fragments that may have contributed to the formation of the Galactic halo. The first calibration of the RRLyrae period-luminosity relation in I, J , H, K taking evolutionary effects into account is provided. Proble...