Multiple Stars across the H-R Diagram - Proceedings of the ESO Workshop held in Garching, Germany, 12-15 July 2005

Multiple Stars across the H-R Diagram - Proceedings of the ESO Workshop held in Garching, Germany, 12-15 July 2005

von: Swetlana Hubrig, Monika Petr-Gotzens, Andrei Tokovinin

Springer-Verlag, 2007

ISBN: 9783540747451 , 305 Seiten

Format: PDF

Kopierschutz: Wasserzeichen

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Preis: 118,99 EUR

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Mehr zum Inhalt

Multiple Stars across the H-R Diagram - Proceedings of the ESO Workshop held in Garching, Germany, 12-15 July 2005


 

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 (

1 A Nearby (

128

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