scholarly journals A new interpretation of the galactic structure from H II regions

1970 ◽  
Vol 38 ◽  
pp. 209-212 ◽  
Author(s):  
Y.P. G. Courtès ◽  
Y.M. Georgelin ◽  
G. Monnet
Keyword(s):  
Pitch Angle ◽  
Spiral Structure ◽  
Galactic Structure ◽  
Radial Velocities ◽  
H Ii Regions ◽  
B Stars ◽  
New Interpretation

From 6000 optical radial velocities of H II regions a new spiral structure (4 arms of pitch angle 20°) is found. The radial velocities of the observed H II regions are the same with the velocities of the H I regions. The kinematics of H II regions is similar to that of Cepheids and B stars.

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.

scholarly journals Radial Velocities of 200 Southern B Stars

1965 ◽  
Vol 130 (4) ◽  
pp. 281-293 ◽  
Author(s):  
W. Buscombe ◽  
P. M. Kennedy
Keyword(s):  
Radial Velocities ◽  
B Stars

scholarly journals The galactic structure and the appearance of the Milky Way

1970 ◽  
Vol 38 ◽  
pp. 222-224
Author(s):  
E. D. Pavlovskaya ◽  
A. S. Sharov
Keyword(s):  
Spatial Distribution ◽  
Surface Brightness ◽  
Milky Way ◽  
Spiral Structure ◽  
Galactic Structure ◽  
Interstellar Matter

The appearance of the Milky Way for an observer situated within our Galaxy is determined by the spatial distribution of stars and absorbing interstellar matter. Hence it may be hoped that the study of the surface brightness of the Milky Way permits to derive the spiral structure of our Galaxy.

Radial Velocities of Southern B stars Determined at the Radcliffe Observatory-VII

1973 ◽  
Vol 165 (4) ◽  
pp. 431-431
Author(s):  
A. D. Thackeray ◽  
S. B. Tritton ◽  
E. N. Walker
Keyword(s):  
Radial Velocities ◽  
B Stars

scholarly journals Interpretation of the apparent anomalies of the Galactic structure

1985 ◽  
Vol 106 ◽  
pp. 305-308
Author(s):  
T. Jaakkola ◽  
N. Holsti ◽  
P. Teerikorpi
Keyword(s):  
Spiral Structure ◽  
Neutral Hydrogen ◽  
Hii Regions ◽  
Galactic Structure ◽  
Circular Motion ◽  
The Sun ◽  
The South ◽  
The North ◽  
Perseus Arm ◽  
Strong Curvature

In maps of the galactic structure based on the kinematical method (Fig. 1) several systematically heliocentric anomalies are found: 1. Assuming purely circular motion, the spiral arms are more tightly wound and the extent of neutral hydrogen is smaller in the northern galactic hemisphere than in the southern one. 2. With separate rotation curves for the north and the south, the arms become anomalously circular. 3. Consequently, there is a striking discrepancy with the stellar spiral structure. 4. There are long straight portions in the arms pointing towards the Sun. 5. There are abrupt knee-like features in the south. 6. Some arms seem to affect the structure of other, outer arms. 7. Conspicuously strong curvature of the arms is found in the north. 8. The HI-density is enhanced at symmetric longitudes on the far side. 9. With the northern rotation model HII-regions and HI avoid the southern tangential circle. 10. The Perseus Arm is displaced at 1 = 180°.

scholarly journals Radial Velocities of Southern B Stars Determined at the Radcliffe Observatory*: (Paper II)

1957 ◽  
Vol 117 (5) ◽  
pp. 579-579 ◽  
Author(s):  
M. W. Feast ◽  
A. D. Thackeray ◽  
A. J. Wesselink
Keyword(s):  
Radial Velocities ◽  
B Stars

scholarly journals Radio Emission from the Vela?Puppis Region

1958 ◽  
Vol 11 (4) ◽  
pp. 550 ◽  
Author(s):  
H Rishbeth
Keyword(s):  
Radio Emission ◽  
Galactic Structure ◽  
H Ii Regions ◽  
Radio Telescopes ◽  
Outstanding Feature ◽  
Thermal Origin ◽  
Thermal Sources

The Vela-Puppis region has been surveyed with Mills Cross radio telescopes, and radio isophotes plotted at two wavelengths. Many discrete sources have been observed. Several H II regions have been detected in emission at 3�5 m and in absorption at 15�2 m; the radiation from such objects is of thermal origin. The outstanding feature of this region is a group of strong non-thermal sources near the galactic equator. These are superimposed on an intense belt of radiation along the equator, and this, too, is certainly non-thermal in origin. Some correlation with galactic structure is suggested.

Sign in / Sign up

Export Citation Format

Share Document