Kinematics and population membership of BHB and EHB stars:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | German |
| Veröffentlicht: |
2002
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| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Bonn, Univ., Diss., 2002 |
| Beschreibung: | X, 159 S. Ill., graph. Darst. |
Internformat
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Datensatz im Suchindex
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CONTENTS
1 AN INTRODUCTION TO THE STRUCTURE OF THE GALAXY AND THE ROLE OF HB
STARS IN GALACTIC RE
SEARCH 1
1.1 THE STUDY OF GALACTIC STRUCTURE. 1
1.1.1 MOTIVATION: WHY DO WE STUDY THE STRUCTURE AND EVOLUTION OF
GALAXIES?
. 1
1.1.2 CHARACTERISTICS OF THE COMPONENTS OF THE MILKY WAY . . . .-. 4
1.1.3 STUDIES OF GALACTIC STRUCTURE. 6
1.1.3.1 STAR COUNTS AND SCALE HEIGHTS. 6
1.1.3.2 KINEMATICAL STUDIES. 6
1.2 HORIZONTAL BRANCH STARS, AND THEIR ROLE AS TRACER TOOLS IN STUDIES
OF GALACTIC STRUCTURE 7
1.2.1 PHYSICAL ASPECTS OF HB STARS, TYPOLOGY, EVOLUTIONARY STATUS. 7
1.2.2 ARE HB STARS GOOD TRACERS FOR STUDIES OF GALACTIC STRUCTURE?. 10
1.3 SHORT OVERVIEW OF THE STRUCTURE OF THIS STUDY AND PREVIOUS RESULTS.
12
1.3.1 PREVIOUS RESULTS. 12
1.3.2 OVERVIEW OF THE STRUCTURE OF THIS WORK. 12
2 DATA AND DATA REDUCTION 15
2.1 THE SAMPLE. 15
2.2 OBTAINING THE DATA. 15
2.2.1 SPECTROSCOPIC DATA. 16
2.2.2 ASTROMETRIC AND PHOTOMETRIC DATA. 16
2.3 DATA REDUCTION AND ANALYSIS. 17
2.3.1 SPECTROSCOPY: DERIVING RADIAL VELOCITIES, LOGY AND T
EFF. 17
2.3.2 PHOTOMETRY. 19
2.3.3 ASTROMETRY. 24
2.3.3.1 2
ND EPOCH MATERIAL:. 25
23
.
3.2 REFERENCE CATALOGUES:. 25
2.3.3.3 REDUCTION:. 25
2.3.3.4 CALIBRATION: . 29
2.4 THE FINAL SAMPLE. 35
III
BIBLIOGRAFISCHE INFORMATIONEN
HTTP://D-NB.INFO/966297946
CONTENTS
3 KINEMATICAL TRENDS AMONG THE FIELD HORIZONTAL BRANCH STARS 37
3.1 INTRODUCTION: HB-STARS, THEIR POPULATION MEMBERSHIP AND THE GALACTIC
STRUCTURE . . 37
3.2 THE DATA. 38
3.2.1 COMPOSITION OF THE SAMPLE. 38
3.2.2 PHYSICAL PROPERTIES OF THE STARS, EXTINCTION. 41
3.2.3 ABSOLUTE MAGNITUDES AND DISTANCES . 41
3.2.4 PROPER MOTIONS AND POSITIONS. 43
\
3.2.5 RADIAL VELOCITIES. 44
3.3 KINEMATICS AND ORBITS. 45
3.3.1 CALCULATING ORBITS AND VELOCITIES. 45
3.3.2 MORPHOLOGY OF THE ORBITS. 47
3.3.3 VELOCITY COMPONENTS AND DISPERSIONS . 47
3.3.4 KINEMATICS OF SDB/O STARS. 49
3.3.5 TREND OF KINEMATICS ALONG THE HB? . 49
3.4 RR LYRAE STARS. 49
3.4.1 A SAMPLE OF RR LYRAE STARS FROM THE LITERATURE . 49
3.4.2 RR-LYRAE KINEMATICS. 51
3.5 SELECTION EFFECTS. 51
3.6 DISCUSSION: TRENDS AND POPULATION MEMBERSHIP. 52
3.6.1 OVERALL TRENDS. 52
3.6.2 DISCUSSION . 53
3.6.3 SUMMARY. 54
4 KINEMATICS AND POPULATION MEMBERSHIP OF SDB STARS 55
4.1 INTRODUCTION.
T. 55
4.1.1 THE SAMPLE. 56
4.1.1.1 SELECTION EFFECTS DUE TO SAMPLE COMPOSITION?. 56
4.2 KINEMATICS AND ORBITS. 57
4.2.1 CALCULATING VELOCITIES AND ORBITS. 57
4.2.1.1 ERRORS . 58
4.2.2 ANALYSIS OF THE VELOCITIES AND VELOCITY DISPERSIONS . 65
4.2.2.1 ANALYSIS OF THE VELOCITIES AND DISPERSIONS OF "PURE" SAMPLES
. 65
4.2.3 THE ORBITS. 72
4.2.3.1 ORBIT MORPHOLOGY. 72
4.2.3.2 ANALYSIS OF THE THE KINEMATICS OVER THE WHOLE ORBITS. 73
4.2.4 NOTES ON INDIVIDUAL STARS. 78
4.2.5 SELECTION EFFECTS . 79
IV
CONTENTS
4.3 DETERMINING A SCALE HEIGHT FOR THE STARS USING THEIR ORBITS. 80
4.3.1 ^-PROBABILITY PLOT AND SCALE HEIGHT. 80
4.3.2 EFFECTS OF ERRORS. 81
4.3.3 SCALE HEIGHT AND GALACTOCENTRIC DISTANCE. 81
4.3.4 ROBUSTNESS OF THE SCALE HEIGHTS, SEPARATING THE DIFFERENT
POPULATIONS. 83
4.3.5 MIDPLANE NUMBER RATIO OF THE TWO COMPONENTS FOUND. 84
4.3.6 CONSTRAINING THE THIN DISK COMPONENT . 84
4.3.7 DISCUSSION OF RESULTS. 86
4.4 DISCUSSION: KINEMATICS AND THE POPULATION MEMBERSHIP OF SDB STARS.
87
4.4.1 THE DISK. 87
4.4.2 THE HALO. 88
4.4.3 ASPECTS OF THE STELLAR EVOLUTION HISTORY OF SDB STARS. 88
4.5 SUMMARY & CONCLUSIONS. 89
5 THE KINEMATICS OF HBB STARS 91
5.1 INTRODUCTION. 91
5.2 SAMPLE COMPOSITION AND DATA REDUCTION . 92
5.2.1 SELECTION EFFECTS . 92
5.3 KINEMATICS AND ORBITS . 92
5.3.1 VELOCITIES. 92
5.3.2 ORBITS. 95
5.4 THE VERTICAL PROBABILITY DISTRIBUTION AND THE SCALEHEIGHT. 95
5.5 DISCUSSION & CONCLUSIONS. 99
6 DISCUSSION OF THE RESULTS 101
6.1 THE KINEMATIC TREND REVISITED. 101
6.2 THE POPULATIONS OF THE MILKY WAY. 105
6.2.1 THE THIN AND THICK DISK. 105
6.2.2 THE HALO. 107
6.2.3 BULGE AND BAR . 110
6.2.3.1 BHB STARS IN THE GALACTIC BULGE - OR DO THEY BELONG TO THE HALO?
. 112
6.2.3.2 DISTURBANCE OF THE THICK DISK BY THE PRESENCE OF A GALACTIC BAR?
. 112
6.2.4 MOVING GROUPS AND STELLAR STREAMS. 114
6.2.5 RELATIONSHIPS OF THE COMPONENTS, EVOLUTION OF OUR GALAXY. 116
7 OUTLOOK 119
7.1 FURTHER STEPS. 119
7.2 THE FUTURE: DIVA AND GAIA. 120
V
CONTENTS
7.3 EPILOGUE. 122
A CORRECTING LARGE GRADIENTS WITH COMBINED DAWN/NIGHT SKY FLAT FIELD
EXPOSURES 125
B DATA OF THE STARS OF THE EQUATORIAL FIELD 127
C VARIABLES AND DEFINITIONS USED IN THIS STUDY 131
C.L PHOTOMETRIC QUANTITIES . 131
C.2 STELLAR PHYSICAL QUANTITIES. 131
C.3 SPATIAL AND KINEMATIC QUANTITIES . 132
C.3.1 OBSERVED QUANTITIES. 132
C.3.2 SPATIAL QUANTITIES AND VELOCITIES. 132
C.3.3 MORPHOLOGICAL PARAMETERS OF THE ORBITS. 134
C.3.4 SCALEHEIGHTS AND DENSITIES. 134
D LIST OF ABBREVIATIONS 137
BIBLIOGRAPHY 141
ZUSAMMENFASSUNG (SUMMARY IN GERMAN) 149
CURRICULUM VITAE 154
LEBENSLAUF (CURRICULUM VITAE IN GERMAN) 155
ACKNOWLEDGEMENTS 156
VI |
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| spelling | Altmann, Martin 1970- Verfasser (DE-588)124379680 aut Kinematics and population membership of BHB and EHB stars vorgelegt von Martin Altmann 2002 X, 159 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Bonn, Univ., Diss., 2002 Milchstraßensystem - Horizontalaststern - Trajektorie <Kinematik> Horizontalaststern (DE-588)4451157-7 gnd rswk-swf Trajektorie Kinematik (DE-588)4208631-0 gnd rswk-swf Milchstraßensystem (DE-588)4169926-9 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Milchstraßensystem (DE-588)4169926-9 g Horizontalaststern (DE-588)4451157-7 s Trajektorie Kinematik (DE-588)4208631-0 s DE-604 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010327923&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Altmann, Martin 1970- Kinematics and population membership of BHB and EHB stars Milchstraßensystem - Horizontalaststern - Trajektorie <Kinematik> Horizontalaststern (DE-588)4451157-7 gnd Trajektorie Kinematik (DE-588)4208631-0 gnd |
| subject_GND | (DE-588)4451157-7 (DE-588)4208631-0 (DE-588)4169926-9 (DE-588)4113937-9 |
| title | Kinematics and population membership of BHB and EHB stars |
| title_auth | Kinematics and population membership of BHB and EHB stars |
| title_exact_search | Kinematics and population membership of BHB and EHB stars |
| title_full | Kinematics and population membership of BHB and EHB stars vorgelegt von Martin Altmann |
| title_fullStr | Kinematics and population membership of BHB and EHB stars vorgelegt von Martin Altmann |
| title_full_unstemmed | Kinematics and population membership of BHB and EHB stars vorgelegt von Martin Altmann |
| title_short | Kinematics and population membership of BHB and EHB stars |
| title_sort | kinematics and population membership of bhb and ehb stars |
| topic | Milchstraßensystem - Horizontalaststern - Trajektorie <Kinematik> Horizontalaststern (DE-588)4451157-7 gnd Trajektorie Kinematik (DE-588)4208631-0 gnd |
| topic_facet | Milchstraßensystem - Horizontalaststern - Trajektorie <Kinematik> Horizontalaststern Trajektorie Kinematik Milchstraßensystem Hochschulschrift |
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