Page 2 - spectroscopic-atlas-5_0-english_Neat
P. 2
Spectroscopic Atlas for Amateur Astronomers 2
Table of Content
1 Introduction ..................................................................................................................8
2 Directory of Tables ................................................................................................... 10
3 Selection, Processing and Presentation of the Spectra..................................... 14
3.1 Selection of Spectra ............................................................................................................................. 14
3.2 Recording and Resolution of the Spectra ........................................................................................ 14
3.3 The Processing of the Spectra ........................................................................................................... 15
3.4 Calibration of the Wavelength ........................................................................................................... 15
3.5 Normalisation of the Intensity............................................................................................................ 16
3.6 Line Identification................................................................................................................................. 16
3.7 Presentation .......................................................................................................................................... 16
4 Terms, Definitions and Abbreviations................................................................... 17
4.1 Parameters and Identification of the Stars ...................................................................................... 17
4.2 Galactic Nebulae and Star Clusters .................................................................................................. 17
4.3 Extragalactic Objects ........................................................................................................................... 17
4.4 "Early" and "Late" Spectral Types ...................................................................................................... 17
4.5 Abbreviations and Units ...................................................................................................................... 17
4.6 Identifying of the Elements and Ions ................................................................................................ 18
4.7 The Metal Abundance Z (Metallicity) ................................................................................................ 18
5 The Fraunhofer Lines ............................................................................................... 19
6 Overview and Characteristics of Stellar Spectral Classes ................................ 20
6.1 The Temperature Sequence ............................................................................................................... 20
6.2 The Luminosity Classes ....................................................................................................................... 23
6.3 Suffixes, Prefixes, and Special Classes ............................................................................................ 23
6.4 Statistical Distribution of Spectral Types to the Main Sequence Stars ...................................... 24
7 Appearance of Elements and Molecules in the Spectra .................................... 25
8 Spectral Class O........................................................................................................ 26
8.1 Overview ................................................................................................................................................ 26
8.2 Parameters of the Early to Late O-Class Stars ................................................................................ 27
8.3 Spectral Characteristics of the O-Class............................................................................................ 27
8.4 General Remarks to the Classification of O-Stars .......................................................................... 27
8.5 Commented Spectra ............................................................................................................................ 28
9 Wolf Rayet Stars ....................................................................................................... 33
9.1 Overview ................................................................................................................................................ 33
9.2 Spectral Characteristics and Classification ..................................................................................... 33
9.3 Classification System for WR Stars in the Optical Spectral Range ............................................. 34
9.4 The WR-Phase in the Stellar Evolution ............................................................................................. 35
9.5 Analogies and Differences to the Planetary Nebulae .................................................................... 35
9.6 Commented Spectra of the WR Classes WN, WC and WO .......................................................... 35
10 Spectral Class B........................................................................................................ 41
10.1 Overview ................................................................................................................................................ 41
