Multiple Stars across the H-R Diagram (eBook)
XIII, 305 Seiten
Springer Berlin (Verlag)
978-3-540-74745-1 (ISBN)
This volume presents results from the ESO workshop Multiple Stars across the H-R Diagram, held in Garching in July 2005. It covers observations of multiple stars from ground and space, dynamical and stellar evolution in multiple systems, formation and early evolution of multiple stars, and special components of multiple stars. The book reviews the current state of observational and theoretical knowledge and discusses future studies for further progress in the field.
Preface 5
Contents 7
List of Participants 10
Evolutionary Processes in Multiple Systems 13
1 Introduction 13
2 Multiples with Two Periods Less than 30 Years 14
3 Multiples with Highly Inclined Orbits 16
4 Summary 21
5 Acknowledgments 21
References 21
Dynamics and Stability of Triple Stars 23
1 Introduction 23
2 Disruption of Triple Systems and Scattering off Binaries 24
3 Long Lasting Stability 26
4 Numerical Methods for Triple Stars 29
5 Conclusion 31
References 31
Multiple Stars: Physics vs. Dynamics 33
1 Introduction 33
2 Statistics of Binaries and Multiples 34
3 Stability of Low-hierarchy Multiples 40
4 Discussion and Conclusions 42
References 42
Gliese 225.2: An Old (Stable?) Quadruplet 43
1 Introduction 43
2 Observations 44
3 The Orbits of Subsystems 44
4 Discussion 47
References 47
Multiple Stars: Designation, Catalogues, Statistics 48
1 Designation of Multiple Stars 48
2 Multiple-Star Catalogues 49
3 Statistics of Multiple Stars 50
4 Conclusions 53
References 53
Radial-velocity Studies of Certain Multiple Systems 54
References 56
Spectral Disentangling Applied to Triple Systems: RV Crt* 57
1 Introduction 57
2 Data 58
3 Component Spectra 59
4 Fundamental Stellar Parameters 60
5 Future Work 62
Acknowledgments 62
References 62
Evidence for Rapid Variability in the Multiple System 68 u Her 63
1 The Project 68 u Her 63
2 The Binary System 64
3 Rapid Variability 68
Acknowledgments 68
References 68
DG Leo: A Triple System with a Surprising Variety of Physical Phenomena 69
1 Introduction 69
2 Astrophysical Relevance 70
3 New Orbital Solutions and Dynamical Mass 72
4 Conclusions 74
Acknowledgements 74
References 74
A Spectroscopic Study of HD 208905 76
1 Introduction 76
2 Spectroscopy 76
3 Orbital Solution 78
4 Acknowledgments 79
References 79
The Suspected Binarity of the Nearby Flare Star Gl 424 80
1 Introduction 80
2 Observations 81
3 Binarity and a Rough Estimate of the Orbital Period 81
References 83
The Ecology of Dense Star Clusters with Binaries 84
1 Introduction 84
2 Simulations 85
3 Evolution of the Binding Energies 87
Acknowledgments 93
References 95
The Formation of Multiple Stars 96
1 Introduction 96
2 Episode I: The Gas Menace 97
3 Episode II: Attack of the Turbulence 99
4 Episode III: Revenge of the Binaries 104
5 Conclusions 106
References 107
Population of Dynamically Formed Triples in Dense Stellar Systems 110
1 Introduction 110
2 Method and Assumptions 110
3 Numerical Results on Dynamically Formed Triples 111
Acknowledgments 115
References 115
Interferometric Studies of Multiple Stars 116
1 If you have been Thinking of Using LBI... 116
2 Modeling of Interferometric Observations of . Virginis 119
3 ...Now is a Good Time to do it 121
References 121
Interferometric Orbits of New Hipparcos Binaries 122
1 Introduction 122
2 Orbits and Masses 123
3 Conclusions 126
References 126
New Facts about d Velorum: Fewer but Larger Components 128
1 A Nearby (~ 24pc) Eclipsing Binary System 128
2 VLTI Observations of the Eclipsing Binary 128
3 Results and Discussion 129
4 Conclusions 130
References 131
Speckle Interferometry of Two Low-mass Triple Systems in the Solar Neighbourhood 133
1 Introduction 133
2 GJ 900 133
3 KUI 99=GJ 795 135
References 136
Tertiary Companions to Close Spectroscopic Binaries 137
1 The Goals and the Sample 137
2 Adaptive Optics Observations 138
3 Search of Companions in 2MASS 139
4 Parameters of Tertiary Companions 139
5 Discussion 142
References 142
Spectroscopic Subcomponents in Visual Double Stars: The Most Probable Values of their Physical and Orbital Parameters. Application to the System WDS 14404+ 2159 144
1 Methodology 144
2 Application to WDS 14404+2159 146
3 Remarks 146
References 147
Multiple Stars in the Field 148
1 It’s the WDS, not the WBS! 148
2 Orbits 150
3 Common Proper Motion 152
4 Common Parallax 153
5 Proximity 154
6 The Washington Multiplicity Catalog (WMC) 154
References 159
Multiplicity of Chemically Peculiar Stars 161
1 Introduction 161
2 Observations 163
3 Discussion 163
References 167
Multiplicity of Contact Binary Stars 168
1 Introduction 168
2 Detection techniques 169
3 Statistics and results 172
References 173
Extrasolar Planets in Double and Multiple Stellar Systems 174
1 Introduction 174
2 Searching for Short-Period Planets in Spectroscopic Binaries 176
3 Probing the Multiplicity Status of Nearby Stars with VLT/ NACO 181
4 Conclusion 184
References 185
Homogeneous Comparison of Directly Detected Planet Candidates: GQ Lup, 2M1207, AB Pic 188
1 Introduction: Direct Imaging of exo-planets 188
2 Observational Evidence: Three Candidates 188
3 Derived Parameters 189
4 Mass Determination by Model Tracks 191
5 Summary and Discussion on Planethood 194
References 195
Searching for Planets Around Stars in Wide Binaries 197
1 Scientific Motivations 197
2 The Sample 198
3 Abundance Analysis 198
4 Radial Velocities 199
References 202
Multiplicity at the Very Low Mass End of the H- R Diagram 203
1 Introduction 203
2 Multiplicity of Ultracool Dwarfs in the Field 204
3 Multiplicity of Ultracool Dwarfs in the Pleiades Open Cluster 206
4 Multiplicity of Ultracool Dwarfs in the Upper Scorpius OB Association 208
5 Ultracool Dwarfs in other Types of Multiple Systems 211
6 Discussion 211
References 212
Spectroscopic Companions of Very Young Brown Dwarfs 214
1 Introduction 214
2 Results of RV Survey in Cha I 215
3 Detection of RV Planets around BDs in Cha I Feasible 216
4 Is the BD Desert a Scalable Phenomenon? 217
5 Conclusions 218
References 219
The Observed Multiplicity of Low-mass Stars: From Embedded Protostars to Open Clusters 221
1 Introduction 221
2 Multiplicity in Young Open Clusters 224
3 Multiplicity among Embedded Protostars 226
4 Implications for the Star Formation Process 229
References 232
High-order Multiplicity of PMS Stars: Results from a VLT/ NACO Survey 235
1 Observation and Data Reduction 235
2 Results 235
3 CTTS vs WTTS Companion Statistics 239
References 240
Accretion onto Binary YSOs Through Gap from Their Circum- binary Disk 241
1 Introduction 241
2 Model and Method of Computation 242
3 Results 243
References 246
The Nearest Pre-Main Sequence Multiple Stars 247
1 Introduction 247
2 Finding the Binary and Multiple Systems Associated with the A Stars 248
3 HD 104237 249
4 HD 169142 251
5 Binarity and Multiplicity 254
6 Significance of the PMS Multiple Stars: 255
Acknowledgements 257
References 257
A Study of the Young Quadruple System AO Vel with a ZAMS Eclipsing BpSi Primary and PMS Companions 260
1 Observations and RV Measurements 260
2 Spectral Analysis 260
3 Orbital Analysis 261
4 Physical Parameters 262
5 Conclusions 263
References 263
Multiplicity of Massive Stars 265
1 The Origin of the Orion Trapezium system 265
2 Relevant Papers 267
Final Note 278
Acknowledgment 278
References 278
The Triple System .1 OrionisA in the Heart of the Orion Trapezium Cluster 281
1 Introduction 281
2 Review of Available Data and Facts of .1 OriA 282
3 The Possible Nature of .1 Ori A2 284
References 286
The Primordial Binary Population in OB Associations 289
1 Introduction 289
2 The Observed Binary Population 290
3 The True Binary Population 293
Acknowledgments 294
References 294
Multiplicity of Early-type Stars in the Field: Progress Report 295
1 Introduction 295
2 Sample Selection 295
3 Observations 296
4 Current Status 297
References 298
Search for Low-mass Companions to X-ray Emitting A- type Stars 299
1 The Mysterious X-ray Emission from A Stars 299
2 Search for New Counterparts 300
3 Assigning New Counterparts to the X-ray Sources 301
References 302
Erscheint lt. Verlag | 13.10.2007 |
---|---|
Reihe/Serie | ESO Astrophysics Symposia | ESO Astrophysics Symposia |
Zusatzinfo | XIII, 305 p. |
Verlagsort | Berlin |
Sprache | englisch |
Themenwelt | Naturwissenschaften ► Physik / Astronomie ► Astronomie / Astrophysik |
Technik | |
Schlagworte | Accretion • Binary stars • exoplanets • globular clusters • Interferometry • Multiple Stars • spectroscopy • Star • Stellar • Stellar Clusters |
ISBN-10 | 3-540-74745-1 / 3540747451 |
ISBN-13 | 978-3-540-74745-1 / 9783540747451 |
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