Variable star monitoring in local group dwarf irregular galaxies
نویسندگان
چکیده
منابع مشابه
Star Formation in Sculptor Group Dwarf Irregular Galaxies and the Nature of “Transition” Galaxies
We present new Hα narrow band imaging of the HII regions in eight Sculptor Group dwarf irregular (dI) galaxies. The Hα luminosities of the detected HII regions range from some of the faintest detected in extragalactic HII regions (∼ 10 erg s in SC 24) to some of the most luminous (∼ 10 erg s in NGC 625). The total Hα luminosities are converted into current star formation rates (SFR). Comparing ...
متن کاملStar Formation Histories of Local Group Dwarf Galaxies
40 galaxies are currently known as, or suspected to be LG members within a radius of 1.8 Mpc. 37 of these galaxies are dwarf galaxies with MB > −18.5 mag. I present a compilation of the star formation histories of dwarf irregulars, dwarf ellipticals, and dwarf spheroidals in the Local Group, and visualize their evolutionary histories through Hodge’s population boxes. The study of these star for...
متن کاملStar Clusters in Virgo and Fornax Dwarf Irregular Galaxies Anil
We present the results of a search for clusters in dwarf irregular galaxies in the Virgo and Fornax Cluster using HST WFPC2 snapshot data. The galaxy sample includes 28 galaxies, 11 of which are confirmed members of the Virgo and Fornax clusters. In the 11 confirmed members, we detect 237 cluster candidates and determine their V magnitudes, V-I colors and core radii. After statistical
متن کاملDwarf Irregular Galaxies ? Liese
New observations of 16 dwarf elliptical galaxies in the Virgo Cluster indicate that at least seven dEs have significant velocity gradients along their optical major axis, with typical rotation amplitudes of 20-30 km s. Of the remaining nine galaxies in this sample, 6 have velocity gradients less than 20 km skpc while the other 3 observations had too low of a signal–to–noise ratio to determine a...
متن کاملGiant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies
We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the optical images, and 2) it is elongated in the direction almost perpendicular to the HI disk of NGC 6822. The structure of this stellar halo looks ...
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: International Astronomical Union Colloquium
سال: 2004
ISSN: 0252-9211
DOI: 10.1017/s0252921100010368