By Erik Gregersen
The sunlight is basically one among a few 2 hundred billion stars that make up the Milky approach. much more mind-boggling, the Milky means is a tiny speck, being just one of one thousand million galaxies within the universe. jam-packed with interesting proof and wonderful images, this booklet examines the Galaxy that people name domestic. Readers also are taken on a trip mild years away, to the area of phenomena comparable to the Oort cloud.
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Extra info for The Milky Way and Beyond: Stars, Nebulae, and Other Galaxies
Variation of Star Density with z Distances For all stars, variation of star density above and below the galactic plane 38 | The Milky Way and Beyond: Stars, Nebulae, and Other Galaxies rapidly decreases with height. Stars of different types, however, exhibit widely differing behaviour in this respect, and this tendency is one of the important clues as to the kinds of stars that occur in different stellar populations. The luminosity function of stars is different at different galactic latitudes, and this is still another phenomenon connected with the z distribution of stars of different types.
Thus, the Sun’s motion can be considered fairly typical for its class in its neighbourhood. The peculiar motion of the Sun is a result of its relatively large age and a somewhat noncircular orbit. It is generally true that stars of later spectral types show both greater dispersions and greater values for solar motion, and this characteristic is interpreted to be the result of a mixture of orbital properties for the later spectral types, with increasingly large numbers of stars having more highly elliptical orbits.
The velocity difference is larger than the velocity dispersions for common stars of the earlier spectral types, but it is very similar in value to the dispersion for stars of a spectral type similar to the Sun. The solar velocity for, say, G5 stars is 10 km/sec (6 miles/sec), and the dispersion is 21 km/sec (13 miles/sec). Thus, the Sun’s motion can be considered fairly typical for its class in its neighbourhood. The peculiar motion of the Sun is a result of its relatively large age and a somewhat noncircular orbit.
The Milky Way and Beyond: Stars, Nebulae, and Other Galaxies by Erik Gregersen