THE ASTROPHYSICS OF EMISSION-LINE STARS

Many types of stars show conspicuous emission lines in their optical spectra. These stars are broadly referred to as emission-line stars, but, in the past, they were considered a type of peculiar stars, because emission lines were thought to be an indication of behaviors "peculiar" from the normal stellar atmospheres. Prior to 1950s, early-type emission-line stars such as Wolf-Rayet stars, Be stars, and P Cygni stars were called the early-type peculiar stars. With the advance in theories of emission-line formation, the name "emissionline stars" has been widely adopted to include both early- and late-type stars, and the name of "peculiar-stars" has been only used for chemically peculiar stars. Some stars that have no particular names as emission-line stars, such as cataclysmic variables and Mira variables, are also included in the category of emission-line stars. In closer examination most of stars on the Hertzsprung-Russell (HR) diagram show somehow evidence of emission lines formed in a less-developed form as in case of the Sun. In this book, however, we confine our examination of emission-line stars to the stars having strong lines in the optical region.


CONTENTS

Preface

Introduction

1. Stellar Atmospheres and Formation of Emission Lines
2. Stellar Spectra and Radiation Fields
3. Dynamic Processes in Stellar Atmospheres
4. Formation of Emission Lines
5. Early-type Emission-line Stars
6. Late-Type Stars and Close Binaries
7. Pre-main Sequence Stars

Supplement
Author Index
Subject Index
Index of Stellar Objects

Páginas : 537
Peso : 19mb.
Formato : PDF.
Edición : Primera
Año de Publicación :2007
ISBN : 978-0387345000
Editorial : Springer
Autor Tomokazu Kogure, Kam-Ching Leung