A few tens au scale physical and chemical structures around young low-mass protostars / / Yoko Oya

• Record Nr.: UNINA9910629285203321
• Autore: Oya Yoko
• Pubbl/distr/stampa: Singapore : , : Springer, , [2022]; ©2022
• ISBN: 9789811917080; 9789811917073
• Descrizione fisica: 1 online resource (219 pages)
• Collana: Springer Theses
• Disciplina: 810
• Soggetti: Protostars
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di bibliografia: Includes bibliographical references.
• Nota di contenuto: Intro -- Supervisor's Foreword -- Preface -- Acknowledgements -- Contents -- 1 Introduction -- 1.1 Formation of Low-Mass (Solar-Type) Stars -- 1.2 Radio Astronomy -- 1.3 Astrochemistry in Star-Forming Region -- 1.3.1 1980s: Astrochemistry in High- and Low-Mass Star-Forming Region -- 1.3.2 1990s: Chemical Composition at a 103 au Scale -- 1.3.3 2000s: Chemical Diversity at a 102-103 au Scale -- 1.3.4 2010s: ALMA Era at 10-102 au Scale -- 1.4 Motivation for This Research -- 1.5 Outline of This Thesis -- References -- 2 ALMA Observation -- 2.1 Principles of Interferometers -- 2.1.1 Coordinate System -- 2.1.2 Correlation Function and Cross Power Spectrum -- 2.1.3 Visibility -- 2.2 ALMA -- 2.2.1 ALMA Site -- 2.2.2 Antennas -- 2.2.3 Receivers -- 2.2.4 Backends -- 2.3 Observations with Interferometers -- 2.3.1 Calibration -- 2.3.2 Observed Intensity Distribution -- 2.3.3 CLEAN Method -- References -- 3 Model Calculation -- 3.1 Introduction -- 3.2 Infalling-Rotating Envelope Model -- 3.2.1 Configuration of the Infalling-Rotating Envelope Model -- 3.2.2 Infalling-Rotating Envelope Model with Various Physical Parameters -- 3.3 Keplerian Model -- 3.4 Outflow Model -- 3.5 Physical Parameters of the Models -- 3.6 Examples of the Model Analysis -- 3.6.1 The L1527 Case -- 3.6.2 The TMC-1A Case -- 3.6.3 Some Caveats for the Model -- References -- 4 L1527 -- 4.1 Introduction -- 4.2 Results -- 4.2.1 Overall Distribution -- 4.2.2 ; Envelope -- 4.2.3 Outflow -- 4.3 Discussion -- 4.3.1 Direction of the Outflow -- 4.3.2 Angular Momentum -- References -- 5 IRAS 15398-3359 -- 5.1 Introduction -- 5.2 Observations -- 5.3 Results -- 5.3.1 Overall Distribution of H2CO and CCH -- 5.3.2 Outflow -- 5.3.3 Protostellar Envelope -- 5.3.4 Comparison with an Envelope Model -- 5.4 Discussion -- References -- 6 IRAS 16293-2422 Source A -- 6.1 Introduction -- 6.2 Observation Data.; 6.3 Molecular Line Distribution -- 6.4 Velocity Structure -- 6.4.1 OCS -- 6.4.2 CH3OH and HCOOCH3 -- 6.4.3 H2CS -- 6.5 Infalling-Rotating Envelope Model -- 6.5.1 OCS -- 6.5.2 CH3OH and HCOOCH3 -- 6.5.3 H2CS -- 6.6 Discussion -- 6.6.1 Infalling-Rotating Envelope and Its Centrifugal Barrier -- 6.6.2 Origin of the Chemical Change Around the Centrifugal Barrier -- 6.6.3 Gas Kinetic Temperatures of H2CS -- 6.6.4 Abundance of HCOOCH3 Relative to CH3OH -- 6.7 Summary of This Chapter -- References -- 7 IRAS 16293-2422 Source B -- 7.1 Introduction -- 7.2 Observation -- 7.3 Distribution -- 7.4 Kinematic Structure -- 7.4.1 Observed Features -- 7.4.2 Comparison of Molecular Distribution with the Source A Case -- 7.5 Modelling -- 7.5.1 Infalling-Rotating Envelope Model -- 7.5.2 Origin of the Inverse P-Cygni Profile -- 7.6 Outflow -- 7.7 Gas Kinetic Temperature -- 7.8 Abundance of Metafont Relative to CH3OH -- 7.9 Summary of This Chapter -- References -- 8 L483 -- 8.1 Introduction -- 8.2 Observation -- 8.3 Distribution -- 8.4 Kinematic Structure -- 8.4.1 Geometrical Configuration -- 8.4.2 CS -- 8.4.3 SO and HNCO -- 8.4.4 NH2CHO and Metafont -- 8.5 Analysis with the Models for the Disk/Envelope System -- 8.6 Outflow Structure -- 8.6.1 Outflow Cavity Wall Traced by CS -- 8.6.2 Comparison with the Outflow Model -- 8.6.3 Rotation Motion in the Outflow -- 8.6.4 SiO Emission -- 8.7 Chemical Composition -- 8.8 Summary of This Chapter -- References -- 9 Chemical Differentiation -- 9.1 Chemical Diversity -- 9.1.1 Chemical Diversity in a Disk Forming Region -- 9.1.2 Which Kind of the Chemical Characteristics is Common? -- 9.2 Chemical Change -- 9.2.1 Drastic Chemical Change Around the Centrifugal Barrier -- 9.2.2 Tracers in WCCC and Hot Corino Sources -- References -- 10 Physical Diversity -- 10.1 Evolution from Envelopes to Disks.; 10.2 Angular Momentum of the Envelope Gas -- 10.3 Relation Between the Envelope and the Outflow -- 10.4 Evolution of Outflows -- 10.4.1 Comparison Between L1527 and IRAS 15398-3359 -- 10.4.2 Relation to Dynamical Ages -- References -- 11 Conclusion -- 11.1 Summary of This Thesis -- 11.2 Future Prospects -- 11.2.1 Transition Zone from the Envelope to the Disk -- 11.2.2 How about in More Evolved Sources? -- 11.2.3 Chemical Heritage: Importance of Sulfur Chemistry -- References -- Appendix A Desorption Temperature -- A.1 Balance of the Adsorption and the Desorption -- Appendix Curriculum Vitae.

The diffident naturalist [[electronic resource] ] : Robert Boyle and the philosophy of experiment / / Rose-Mary Sargent

• Record Nr.: UNINA9910785402003321
• Autore: Sargent Rose-Mary
• Pubbl/distr/stampa: Chicago, : University of Chicago Press, 1995
• ISBN: 1-283-05854-5; 9786613058546; 0-226-73562-1
• Descrizione fisica: 1 online resource (369 p.)
• Collana: Science and its conceptual foundations
• Classificazione: UB 3124
• Disciplina: 530/.092; B
• Soggetti: Scientists - Great Britain
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: pt. 1. Learning from the past -- pt. 2. Being a Christian virtuoso -- pt. 3. Acting experimentally.
• Sommario/riassunto: In a provocative reassessment of one of the quintessential figures of early modern science, Rose-Mary Sargent explores Robert Boyle's philosophy of experiment, a central aspect of his life and work that became a model for mid- to late seventeenth-century natural philosophers and for many who followed them. Sargent examines the philosophical, legal, experimental, and religious traditions-among them English common law, alchemy, medicine, and Christianity-that played a part in shaping Boyle's experimental thought and practice. The roots of his philosophy in his early life and education, in his religious ideals, and in the work of his predecessors-particularly Bacon, Descartes, and Galileo-are fully explored, as are the possible influences of his social and intellectual circle. Drawing on the full range of Boyle's published works, as well as on his unpublished notebooks and manuscripts, Sargent shows how these diverse influences were transformed and incorporated into Boyle's views on and practice of experiment.