Stellar Formation - 1st Edition - ISBN: 9780080180625, 9781483147079

Stellar Formation

1st Edition

International Series in Natural Philosophy, Volume 97

Authors: V C Reddish
eBook ISBN: 9781483147079
Imprint: Pergamon
Published Date: 1st January 1978
Page Count: 302
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Description

Stellar Formation brings together knowledge about the formation of stars. In seeking to determine the conditions necessary for star formation, this book examines questions such as how, where, and why stars form, and at what rate and with what properties. This text also considers whether the formation of a star is an accident or an integral part of the physical properties of matter. This book consists of 13 chapters divided into two sections and begins with an overview of theories that explain star formation as well as the state of knowledge of star formation in comparison to stellar structure and evolution. The places in which stars are forming are then analyzed by focusing on the distributions of very young stars, globules, and cloud fragments. The relationship between the distributions of stars and interstellar clouds is also considered. The chapters that follow explore the frequency distribution of stellar masses as well as the masses of aggregates of stars and interstellar clouds. The reader is also introduced to the rate and environment of star formation; the cloud-like structure of the interstellar gas; the ordering of interstellar clouds into spiral arms; and the conditions under which a cloud will contract until it is set inevitably on the route to becoming a star. The remaining chapters examine the fragmentation of clouds into protostars and the evolution of galaxies. This text will be of interest to students and practitioners of astronomy.

Table of Contents


Part 1: Data

Chapter 1. Introduction

Chapter 2. Locations of Star Formation

The Distribution of Young Stars

The Distribution of Interstellar Gas, Clouds and Globules

Spatial Relationships between Young Stars and Interstellar Matter

Summary

Chapter 3. The Frequency Distribution of Stellar Masses

The Luminosity Function ϕ(Mv)

The Initial Luminosity Function ψ(Mv)

The Initial Mass-Luminosity Relation

The Initial Mass Function

Summary

Chapter 4. The Frequency Distribution of the Masses of Aggregates of Stars

Chapter 5. The Frequency Distribution of Cloud Masses

Interstellar Call Absorption Lines

21 cm Hydrogen Line Emission

Dust Clouds

Chapter 6. The Rate of Star Formation

Some Analytical Relationships

The Rate of Star Formation in Galaxies as a Function of Gas Content, from Bright Star Counts and 21 cm Hydrogen Line Measurements

Dependence of the Rate of Star Formation on Gas Density

Chapter 7. The Environment of Star Formation

Molecular Hydrogen in the Galaxy

Interstellar and Circumstellar Obscuration

Temperatures in Pre-Stellar Clouds

Interstellar Magentic Fields

Motions of the Interstellar Gas

Element Abundances in the Interstellar Gas

Element Abundances in the Stars

Part 2: Theory

Chapter 8. Cloud Structure in the Interstellar Gas

The Maintenance of a Cloud Structure

The Generation of a Cloud Structure

Chapter 9. The Ordering of Clouds into Spiral Arms

The Maintenance of Spiral Density Waves

The Origin of Spiral Density Waves

Ejection from Galactic Nuclei

Mass Arms

Spiral Arms in relation to Star Formation

Chapter 10. Conditions for Contraction of Clouds

Gas Pressure, Turbulence and Rotation

Radiation Pressure

Magnetic Pressure

Chapter 11. The Fragmentation of Clouds into Protostars and the Frequency Distribution of Protostar Masses

Random Fragmentation

Hierarchal Fragmentation

Fragmentation Induced by Molecule Formation

Other Theories

Summary

Chapter 12. The Rate of Formation of Stars

Gravitational Turbulence

Molecule Formation

Chapter 13. The Evolution of Galaxies

Star Formation in the Protogalaxy, Controlling Influences of Grains and Molecules

Model Calculations

Other Models and Analyses, Grain temperature, Mass/Luminosity Ratios, Origin of Galaxy Types, Chemical Evolution, Evolution within Galaxies

Conclusion

References

Subject Index


Details

No. of pages:
302
Language:
English
Copyright:
© Pergamon 1978
Published:
Imprint:
Pergamon
eBook ISBN:
9781483147079

About the Author

V C Reddish