Galactic Structure and Dynamics

2019 ◽  
pp. 201-238
Author(s):  
Pieter C. van der Kruit
Keyword(s):  
Galactic Structure ◽  
Structure And Dynamics

scholarly journals The Impact of Star Parallaxes and Very Accurate Proper Motions on Galactic Structure and Dynamics Studies

1980 ◽  
Vol 5 ◽  
pp. 799-804
Author(s):  
Per Olof Lindblad
Keyword(s):  
Absolute Magnitude ◽  
Galactic Structure ◽  
Proper Motions ◽  
Structure And Dynamics ◽  
Hyades Cluster ◽  
Magnitude Scales ◽  
The Absolute ◽  
Photometric Measurements ◽  
The Impact ◽  
Distance Indicators

Assuming that we have the absolute parallaxes and homogeneous set of proper motions for a large number of stars as described by the previous speakers - how should we use them in studies of galactic structure and dynamics?Concerning the parallaxes I will be very brief - the subject has already been discussed by Dr. Pagel. Clearly, the main importance of the absolute parallaxes obtained is in the calibration of photometric or spectrophotometric absolute magnitude scales. For a sufficient number of stars observed in the Hyades cluster at a distance of 50 pc and in the Scorpius-Centaurus association the systematic error, which lies at the bottom of all subsequent calibration of distance indicators, may be reduced to the same order as the accuracy of photometric measurements.

Largescale Problems of Galactic Structure and Dynamics

1984 ◽  
Vol 88 ◽  
pp. 223-229
Author(s):  
K.C. Freeman
Keyword(s):  
Dark Matter ◽  
Classical Problem ◽  
Galactic Structure ◽  
Matter Density ◽  
Radial Velocities ◽  
The Other ◽  
The Sun ◽  
Structure And Dynamics ◽  
F Stars ◽  
Total Matter

In tills review, I will talk about some galactic problems for which stellar radial velocities are important. I will not attempt to be comprehensive, but will just pick out some problems which are being actively studied and which I find particularly interesting.This is a classical problem. The aim is to estimate the total matter density near the Sun from the distribution and kinematics of a tracer population towards the galactic poles. Recently Bahcall (1984a,b,c) has made a major attack on this problem, using F stars and W giants. He finds that about half the total matter density near the Sun is unaccounted for. This is important. We know from work on other diek galaxies that about half their mass lies in a dark corona and the other half in the disk; the nature of this dark matter is not yet understood. If we also see that about half the mass of the disk itself is dark, then that is certainly worth knowing, because this dark matter has dissipated to the disk. That may help us to understand the nature of the dark matter.

scholarly journals 33. Structure and Dynamics of the Galactic System (Structure Et Dynamique Du Système Galactique)

1991 ◽  
Vol 21 (1) ◽  
pp. 339-371
Keyword(s):  
Galactic Structure ◽  
System Structure ◽  
Structure And Dynamics ◽  
Galactic System ◽  
General Field ◽  
Broad Domain ◽  
Subjective View ◽  
Astronomy And Astrophysics ◽  
Exhaustive List ◽  
Selection Of

This report is intended to provide references to works done during the triennium 1988-1990 (including references for 1987) in the general field of galactic structure.“Astronomy and Astrophysics Abstracts” provides an exhaustive list of works related to galactic structure and dynamics and it is not the aim of this report to duplicate this already existing service. Only a selection of works, illustrating some trends and highlights (a subjective view !), are described here and will certainly allow a comprehensive view of the broad domain of galactic research.

33. Structure and Dynamics of the Galactic System (Structure Et Dynamique Du Systeme Galactique)

1988 ◽  
Vol 20 (01) ◽  
pp. 377-381
Author(s):  
W. B Burton ◽  
M. Mayor ◽  
J. Bahcall ◽  
L. Balasz ◽  
J. Binney ◽  
...  
Keyword(s):  
Galactic Structure ◽  
System Structure ◽  
Short Version ◽  
The Past ◽  
Structure And Dynamics ◽  
Galactic System ◽  
General Field ◽  
Major Section ◽  
The One

Commission 33 has the long-standing tradition of producing two versions of the report covering its activities in the general field of Galactic Structure during the past triennium. The short version of the report is the one presented here. A longer, more complete version, is being printed by the President for distribution to all members of the Commission.Compilation of the triennial summary is one of the major tasks of Commission officers. Section 2 of this report was prepared by M. Major; section 3 by L. Balasz; sections 4 and 8 by L. Blitz; section 5 by G. Lynga; section 6 by D. Hartmann; section 7 by J. Bloemen; sections 9 and 10 by U. Haud and J. Einasto; section 11 by R. Wielen; section 12 by B. Puchs; section 13 by J. Binney; and section 14 by V. Malyuto and J. Einasto.

scholarly journals Science highlights from Hipparcos

2007 ◽  
Vol 3 (S248) ◽  
pp. 8-13 ◽  
Author(s):  
M. A. C. Perryman
Keyword(s):  
Solar System ◽  
Binary Star ◽  
Galactic Structure ◽  
Photometric Data ◽  
Stellar Structure ◽  
Scientific Applications ◽  
Structure And Dynamics ◽  
Direct Use

AbstractThe Hipparcos and Tycho Catalogues were published in 1997. In the intervening 10 years, several thousand papers making more-or-less direct use of the data have been published. I summarise a number of scientific applications which illustrate the variety of problems to which the data have been applied. This includes the re-reduction of old and contemporary astrometric observations, investigations of Galactic structure and dynamics, investigations of stellar structure and evolution, investigations of the Solar System and our Earth's environment, and various uses of the binary star and photometric data.

Calibration problems in hydrogen luminosities

1966 ◽  
Vol 24 ◽  
pp. 322-330
Author(s):  
A. Beer
Keyword(s):  
Galactic Structure ◽  
B Stars ◽  
Insight Into

The investigations which I should like to summarize in this paper concern recent photo-electric luminosity determinations of O and B stars. Their final aim has been the derivation of new stellar distances, and some insight into certain patterns of galactic structure.

Nucleosome dynamics

2006 ◽  
Vol 73 ◽  
pp. 109-119 ◽  
Author(s):  
Chris Stockdale ◽  
Michael Bruno ◽  
Helder Ferreira ◽  
Elisa Garcia-Wilson ◽  
Nicola Wiechens ◽  
...  
Keyword(s):  
High Resolution ◽  
Chromatin Structure ◽  
Current Knowledge ◽  
Dynamic Properties ◽  
Structure And Dynamics ◽  
Nucleosome Dynamics ◽  
Sharp Focus ◽  
Recent Advances ◽  
Insight Into ◽  
Chromatin Structure And Dynamics

In the 30 years since the discovery of the nucleosome, our picture of it has come into sharp focus. The recent high-resolution structures have provided a wealth of insight into the function of the nucleosome, but they are inherently static. Our current knowledge of how nucleosomes can be reconfigured dynamically is at a much earlier stage. Here, recent advances in the understanding of chromatin structure and dynamics are highlighted. The ways in which different modes of nucleosome reconfiguration are likely to influence each other are discussed, and some of the factors likely to regulate the dynamic properties of nucleosomes are considered.

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