The physics of the accretion process in the formation and evolution of Young Stellar Objects
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| 100 | 1 | |a Manara, Carlo Felice |d 1986- |e Verfasser |0 (DE-588)170742830 |4 aut | |
| 245 | 1 | 0 | |a The physics of the accretion process in the formation and evolution of Young Stellar Objects |c Carlo Felice Maria Manara. Betreuer: Barbara Ercolano |
| 264 | 1 | |c 2014 | |
| 300 | |a XXII, 217 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
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| 502 | |a München, Univ., Diss., 2014 | ||
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Datensatz im Suchindex
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|---|---|
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| _version_ | 1816714017818804225 |
| adam_text | THE PHYSICS
OF THE ACCRETION PROCESS
IN THE FORMATION AND EVOLUTION
OF YOUNG STELLAR OBJECTS
CARLO FELICE MANARA
MIINCHEN 2014
HTTP://D-NB.INFO/1055054766
CONTENTS
ABSTRACT XVII
ZUSAMMENFASSUNG XVII
LIST OF ACRONYMS XXI
1 INTRODUCTION 1
1.1 SETTING THE SCENE: THE EVOLUTIONARY PATH FROM MOLECULAR CLOUD CORES
TO STARS
AND PLANETS 1
1.2 STAR-DISK INTERACTION: ACCRETION 5
1.2.1 MAGNETOSPHERIC ACCRETION 5
1.3 ACCRETION AS A TRACER OF PROTOPLANETARY DISK EVOLUTION 7
1.3.1 EVOLUTION OF ACCRETION RATES WITH TIME IN A VISCOUS DISK 7
1.3.2 EVOLUTION OF ACCRETION RATES WITH TIME DUE TO PHOTOEVAPORATION ...
13
1.3.3 THE DEPENDENCE OF ACCRETION RATES WITH THE MASS OF THE CENTRAL
STAR . 15
1.4 THE ROLE OF THIS THESIS 20
1.4.1 THE STATE OF THE ART AT THE BEGINNING OF THIS THESIS 20
1.4.2 OPEN ISSUES AT THE BEGINNING OF THIS THESIS 24
1.4.3 THE STRUCTURE OF THIS THESIS 25
2 MODELING THE ACCRETION SPECTRUM 29
2.1 ACCRETION SPECTRUM MODELS IN THE LITERATURE 29
2.2 THE SLAB MODEL 31
2.2.1 THE HYDROGEN EMISSION 32
2.2.2 THE H~ EMISSION 35
2.2.3 THE TOTAL EMISSION OF THE SLAB MODEL 37
2.3 DEPENDENCE OF SELECTED FEATURES ON THE INPUT PARAMETERS 37
2.3.1 CONTRIBUTION OF H AND H~ TO THE TOTAL EMISSION 38
2.3.2 BALMERJUMP 39
2.3.3 BALMER AND RASCHEN CONTINUA 40
3 PHOTOSPHERIC TEMPLATES OF YOUNG STELLAR OBJECTS AND THE IMPACT OF
CHROMOSPHERIC
EMISSION ON ACCRETION RATE ESTIMATES 43
3.1 INTRODUCTION 44
3.2 SAMPLE, OBSERVATIONS, AND DATA REDUCTION 45
3.3 SPECTRAL TYPE CLASSIFICATION 48
3.3.1 SPECTRAL TYPING FROM DEPTH OF MOLECULAR BANDS 48
3.3.2 SPECTRAL INDICES FOR M3-M8 STARS 49
3.4 STELLAR PARAMETERS 56
3.4.1 STELLAR LUMINOSITY 56
3.4.2 STELLAR MASS AND AGE 58
VII
CONTENTS
3.5 LINE CLASSIFICATION 58
3.5.1 EMISSION LINES IDENTIFICATION 58
3.5.2 HA EQUIVALENT WIDTH AND 10% WIDTH 60
3.5.3 LINE LUMINOSITY 60
3.6 IMPLICATIONS FOR MASS ACCRETION RATES DETERMINATION 62
3.6.1 ACCRETION LUMINOSITY NOISE 66
3.6.2 MASS ACCRETION RATE NOISE 69
3.7 CONCLUSION 72
3.A COMMENTS ON INDIVIDUAL OBJECTS 73
3.B NIR SPECTRAL INDICES 74
3.C ON-LINE MATERIAL 78
4 ACCURATE DETERMINATION OF ACCRETION AND PHOTOSPHERIC PARAMETERS IN
YOUNG
STELLAR
OBJECTS 85
4.1 INTRODUCTION 86
4.2 SAMPLE, OBSERVATIONS, AND DATA REDUCTION 87
4.2.1 TARGETS SELECTION AND DESCRIPTION 87
4.2.2 OBSERVATIONS AND DATA REDUCTION 88
4.3 METHOD 89
4.3.1 PARAMETERS OF THE MULTICOMPONENT FIT 90
4.3.2 DETERMINATION OF THE BEST FIT 91
4.3.3 COMPARISON TO SYNTHETIC SPECTRA 93
4.3.4 STELLAR PARAMETERS 94
4.4 RESULTS 95
4.4.1 OM1186 95
4.4.2 OM3125 97
4.5 DISCUSSION 97
4.5.1 AGE RELATED PARAMETERS 100
4.5.2 SOURCES OF ERROR IN THE PREVIOUS CLASSIFICATIONS 100
4.5.3 IMPLICATIONS OF OUR FINDINGS 102
4.6 CONCLUSION 103
5 ON THE GAS CONTENT OF TRANSITIONAL DISKS 105
5.1 INTRODUCTION 106
5.2 OBSERVATIONS 108
5.2.1 SAMPLE DESCRIPTION 108
5.2.2 OBSERVATIONAL STRATEGY 110
5.2.3 DATA REDUCTION 111
5.3 ACCRETION AND PHOTOSPHERIC PARAMETERS 114
5.3.1 METHOD DESCRIPTION 114
5.3.2 INFRARED COLOR EXCESS 123
5.4 WIND SIGNATURES 124
5.5 DISCUSSION 125
VIII
CONTENTS
5.5.1 ACCRETION PROPERTIES 126
5.5.2 WIND PROPERTIES 128
5.5.3 ACCRETION AND WIND PROPERTIES IN OBJECTS WITH INNER DISK EMISSION
. 132
5.5.4 CONSTRAINT ON THE GAS CONTENT OF THE INNER DISK 133
5.5.5 DISCUSSION ON THE GAS CONTENT OF THE INNER DISK 137
5.6 CONCLUSIONS 139
5.A COMMENTS ON INDIVIDUAL OBJECTS 140
5.A.1 SAMPLE PROPERTIES 140
5.B ADDITIONAL LITERATURE DATA 141
6 ACCRETION AS A FUNCTION OF STELLAR PROPERTIES
IN NEARBY STAR FORMING REGIONS 143
6.1 INTRODUCTION 143
6.2 ACCRETION IN THE LUPUS CLOUDS 144
6.2.1 SAMPLE 145
6.2.2 STELLAR AND SUBSTELLAR PROPERTIES 146
6.2.3 ACCRETION RATE DETERMINATION 150
6.2.4 ACCRETION PROPERTIES OF STELLAR AND SUBSTELLAR OBJECTS IN LUPUS
.... 157
6.3 ACCRETION IN THE A-ORIONIS REGION 159
6.4 NEW DATA IN THE P-OPHIUCUS EMBEDDED COMPLEX 160
6.4.1 SAMPLE, OBSERVATIONS, AND DATA REDUCTION 162
6.4.2 STELLAR AND SUBSTELLAR PROPERTIES 163
6.4.3 ACCRETION PROPERTIES OF P-OPHIUCUS YOUNG STELLAR OBJECTS 174
6.5 NEW DATA IN THE UPPER SCORPIUS ASSOCIATION 178
6.6 DISCUSSION 180
6.6.1 ACCRETION LUMINOSITY AND STELLAR LUMINOSITY RELATION 181
6.6.2 ACCRETION AS A FUNCTION OF STELLAR MASS 184
6.6.3 ACCRETION AS A FUNCTION OF AGE 187
6.7 CONCLUSIONS 191
7 CONCLUSIONS 193
ACKNOWLEDGMENTS 210
IX
|
| any_adam_object | 1 |
| author | Manara, Carlo Felice 1986- |
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| dewey-ones | 530 - Physics |
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| dewey-search | 530 |
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| dewey-tens | 530 - Physics |
| discipline | Physik |
| format | Thesis Book |
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| spellingShingle | Manara, Carlo Felice 1986- The physics of the accretion process in the formation and evolution of Young Stellar Objects |
| subject_GND | (DE-588)4113937-9 |
| title | The physics of the accretion process in the formation and evolution of Young Stellar Objects |
| title_auth | The physics of the accretion process in the formation and evolution of Young Stellar Objects |
| title_exact_search | The physics of the accretion process in the formation and evolution of Young Stellar Objects |
| title_full | The physics of the accretion process in the formation and evolution of Young Stellar Objects Carlo Felice Maria Manara. Betreuer: Barbara Ercolano |
| title_fullStr | The physics of the accretion process in the formation and evolution of Young Stellar Objects Carlo Felice Maria Manara. Betreuer: Barbara Ercolano |
| title_full_unstemmed | The physics of the accretion process in the formation and evolution of Young Stellar Objects Carlo Felice Maria Manara. Betreuer: Barbara Ercolano |
| title_short | The physics of the accretion process in the formation and evolution of Young Stellar Objects |
| title_sort | the physics of the accretion process in the formation and evolution of young stellar objects |
| topic_facet | Hochschulschrift |
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