HistoryevolutionWe combine the results of stellar evolution models and observations on the total luminosity and mass of stars in the Galactic Centre to determine the roost likely form of the IMF of stars in the Galactic Centre. We find that the observations of the Galactic Centre are well ...
The Shadow of the Supermassive Black Hole in the Center of the Milky Way 1时32分 2470播放 Galactic archaeology — uncovering the formation history of our Galaxy with large sky surveys 1时16分 968播放 Introduction to Superconductivity: Discovery and a general survey 1时54分 12118播放 Ginzburg-Lan...
In this paper, we use different luminosity ratios to trace the histories of star formation of two different kinds of starburst galaxies: HII galaxies and starburst nucleus galaxies (SBNGs). The mean star formation rates (SFRs) for these galaxies is compa
From a reanalysis of O and Fe abundances in a large sample of stars in the solar neighbourhood, we found that the Fe/O abundance ratio is nearly constant in the (inner) halo and the thick disk. Within a homogeneous collapse scenario, this means that the timescale for halo collapse was ...
This new measurement of the star formation rate matches those earlier estimates. The rate peaked nearly 11 billion years ago, when every cubic megaparsec of space — a volume just over 3 million light-years on a side — converted about 0.1 solar masses of gas into stars every year. That’...
The results of our analysis of the data fall into two categories: (1) Derivation of the physical properties of the stars and a comparison with models. (2) The variation in C star properties with position in the LMC and implications for the history of star formation. For the 197 stars ...
The spatial distribution of the stars shows that the star formation in NGC 5471 has proceeded along the whole region during, at least, the last 100 Myr. The current ionizing clusters are enclosed within a large bubble, which is likely to have been produced by the stars that formed in a ...
STAR FORMATION HISTORY OF THE MILKY WAY HALO TRACED BY THE OOSTERHOFF DICHOTOMY AMONG GLOBULAR CLUSTERSmethods: statisticalHertzsprung-Russell and colour-magnitude diagramsstars: horizontal branchstars: Population IIstars: variables: RR Lyraeglobular clusters: general...
We use a large sample of about 100 low-mass pre–main-sequence (PMS) stars in the Upper Scorpius OB association to explore the star formation history and the initial mass function of this association. Upper Scorpius is an ideal target for such a study, because the star formation process the...
The variation of metallicities in dwarf galaxies supports the fact that low rate of SNII production in dwarf galaxies is responsible for variation in metallicity in dwarf galaxies of similar masses as suggested by various authors. 展开 关键词: stars: winds outflows galaxies: star formation ...