منابع مشابه
Populating Stellar Orbits inside a Rotating, Gaseous Bar
In an effort to better understand the formation and evolution of barred galaxies, we have examined the properties of equatorial orbits in the effective potential of one specific model of a rapidly rotating, steady-state gas-dynamical bar that has been constructed via a self-consistent hydrodynamical simulation. At a given value of the Jacobi constant, roughly half of all test particles (stars) ...
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The last few years witnessed a change of perspective in the context of galaxy formation and evolution. The major role played by bars in the history of these fundamental building blocks of our universe was finally realized. However, and despite the fact that one of the major concerns of any physical science is to measure timescales for natural phenomena, we have as yet no established way to esti...
متن کاملThe central bar in M 94
Visual, NIR, and H α surface photometry of the oval disk galaxy M 94 (NGC 4736) was performed to study the distribution of mass in old stars and the distribution of the warm emission line gas. The radial profile of the inner stellar disk is steeper than exponential and displays twisted and deformed isophotes. Dust is not responsible for these deviations. The investigation of a number of morphol...
متن کاملYoung massive stellar populations in M 33
In this paper we estimate the ratio OB stars to red supergiants (OB/R) as a function of the distance from the centre of M 33. We found a gradient of the ratio (OB/R) really exists. Our study is based on a new approach in estimating the errors on the ratio (OB/R). On the other hand, by applying a new correlation technique between OB star candidates and red supergiant candidates in the central re...
متن کاملReview of Gereon M Uller: A-bar Syntax
A-bar Syntax is a very welcome addition to the crosslinguistic study of A-bar movement. It contains a wealth of interesting data, in particular from German, but also from Russian, Korean, and other languages. Moreover, it is written in a very clear style which makes it pleasant and easy to read despite its close to 500 pages. M uller's book serves at least two purposes: Firstly, it is an introd...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20011723