Accretion Processes in Star FormationCambridge University Press, 15 lis 2000 - 237 Recent discoveries of extrasolar planets and new direct evidence for protoplanetary disks around young stars have had a major impact on our understanding of star and planet formation. This volume provides a thorough, up-to-date, and concise overview of the physical processes involved in the formation of stars and their surrounding disks. The book traces the story of star formation from the fragmentation of cold molecular gas clouds, through the formation of protostars and rotating dusty disks to the subsequent accretion of material onto the central star. Lee Hartmann integrates state-of-the-art theoretical models with recent observations, highlighting important problems that remain to be solved. |
Spis treści
Preface | 7 |
Initial conditions for protostellar collapse | 16 |
Protostellar cloud collapse | 35 |
23 | 44 |
observations vs theory | 52 |
Disk accretion | 77 |
The disks and envelopes of T Tauri stars | 102 |
The FU Orionis objects | 132 |
Disk winds and magnetospheric accretion | 154 |
Disk accretion and early stellar evolution | 189 |
Basic hydrodynamic and MHD equations | 211 |
Bibliography | 224 |
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Kluczowe wyrazy i wyrażenia
absorption accretion disk angular momentum annulus Ap.J assumed binary birthline blueshifted boundary layer Calvet central star Chapter circumstellar disk Class I sources collapse constant CTTS deuterium disk accretion disk mass disk model dust effective temperature emission lines equation estimate excess emission extinction flux free-fall FU Ori objects Hayashi tracks Herbig hot continuum HR diagram hydrostatic equilibrium infalling envelope infrared initial inner disk Jeans mass Kenyon & Hartmann Keplerian line profiles low-mass stars luminosity magnetospheric mass accretion rates mass infall rate mass loss rates molecular cloud cores Myers near-infrared observed opacity optical depth optically-thick outflows photospheric pre-main-sequence stars pressure produced protostars protostellar radiation radiative radii radius regions rotation scales similarity solution singular isothermal sphere spectral spectrum spherical star formation stellar magnetic field stellar surface suggest Tauri stars Taurus thermal timescale typical viscosity wavelengths WTTS young stars