! wavelength shifts in solar-type spectra ! dainis dravins, lennart lindegren, hans-günter ludwig,...
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WAVELENGTH SHIFTS IN WAVELENGTH SHIFTS IN SOLAR-TYPE SPECTRASOLAR-TYPE SPECTRA
WAVELENGTH SHIFTS IN WAVELENGTH SHIFTS IN SOLAR-TYPE SPECTRASOLAR-TYPE SPECTRA
!Dainis Dravins, Lennart Lindegren, Hans-Günter Ludwig, Søren Madsen
Lund Observatory, Sweden
Cool Stars 13, Hamburg, July 2004
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WAVELENGTH SHIFTS !WAVELENGTH SHIFTS !WAVELENGTH SHIFTS !WAVELENGTH SHIFTS !
Usually interpreted as “Radial
velocity”
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"Definition" of radial velocity"Definition" of radial velocity"Definition" of radial velocity"Definition" of radial velocity
"The radial component is stellar movementtoward or away from us. This motion
mustbe measured from a star's spectrum."
C.De Pree & A.Axelrod: The Complete Idiot's
Guide to Astronomy, p.258 (1999)
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Astrometric radial velocities IAstrometric radial velocities I
Dravins, Lindegren & Madsen, A&A 348, 1040
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Astrometric radial velocities IIAstrometric radial velocities II
Dravins, Lindegren & Madsen, A&A 348, 1040
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Astrometric radial velocities IIIAstrometric radial velocities III
Dravins, Lindegren & Madsen, A&A 348, 1040
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Pleiades from Hipparcos Proper motions over 120,000 years
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STARPATHS (200,000 y)STARPATHS (200,000 y)
Madsen, Dravins & Lindegren, A&A 381, 446
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Hyades from Hipparcos D. Dravins, IAU Symp. 215 (2004)
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Hyades lineshifts Madsen, Dravins & Lindegren, A&A 381, 446
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Gravitational
redshifts
D. Dravins
IAU Symp. 210
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STELLAR GRANULATIONSTELLAR GRANULATION
Hans-Günter Ludwig (Lund)
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“Beta Hydri” [G2 IV] Synthetic Fe I line & mirror
profileDravins, Lindegren, Nordlund & VandenBerg, ApJ 403, 385
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Lineshift & stellar rotation
Madsen, Dravins & Lindegren, A&A 381, 446 & Dravins, IAU Symp. 215
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Atmospheric shockwaves (Hartmut Holweger,
Kiel)
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PROGRESS IN SCIENCEPROGRESS IN SCIENCEPROGRESS IN SCIENCEPROGRESS IN SCIENCE
is driven by ...
Confrontation between theory and observation
Falsification of theoretical hypotheses
New observational measures requiring explanation
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PROGRESS IN SCIENCEPROGRESS IN SCIENCEPROGRESS IN SCIENCEPROGRESS IN SCIENCE
is not driven by ...
Agreement between theory and observation
(when they agree, not much new can be learned)
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PROGRESSPROGRESS ININ STELLARSTELLAR PHYSICSPHYSICSPROGRESSPROGRESS ININ STELLARSTELLAR PHYSICSPHYSICS
Requires disagreement between
theory and observation !
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Non-LTE in convective lineshifts
Dravins & Nordlund,
A&A 228, 184
Dravins, IAU Symp. 210
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Fe II lineshifts at solar
disk center
Dravins, IAU Symp. 210
Solar data:
Allende Prieto & García López, A&AS
131, 341
Laboratory wavelengths:
S. Johansson (Lund)
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Fe II lineshifts at solar
disk center
2-D models by Aleksey Aleksey
GadunGadun, Kyiv, Ukraine
Dravins, IAU Symp. 210
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Ni I lineshifts at solar
disk center
Dravins, IAU Symp. 210
Solar data:
Allende Prieto & García López, A&AS
131, 341
Laboratory wavelengths:
U. Litzén, J.W.Brault, A.P.Thorne, Phys.Scr.
47, 628
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429 Ti I bisectors at solar
disk center
Solar data:
“Hamburg photosphere” H.
Neckel, Solar Phys. 184, 421
Kurucz et al.: Solar Flux Atlas from 296 to
1300 nm
Laboratory wavelengths:
P. Forsberg, Phys.Scr. 44, 446
U. Litzén (Lund)
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Same spectral line in
different stars
Dravins, IAU Symp. 210
Adapted from
Dravins & Nordlund, A&A 228, 203
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IMAGING STELLAR SURFACESIMAGING STELLAR SURFACESIMAGING STELLAR SURFACESIMAGING STELLAR SURFACES
ESO VLTI : AT1 and domes of the 8.2 m unit telescopes
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Same spectral line in
different stars
Adapted from
Dravins & Nordlund, A&A 228, 203
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IMAGING STELLAR SURFACESIMAGING STELLAR SURFACESIMAGING STELLAR SURFACESIMAGING STELLAR SURFACES
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IMAGING STELLAR SURFACESIMAGING STELLAR SURFACESIMAGING STELLAR SURFACESIMAGING STELLAR SURFACES
Optical VLA
Antoine Labeyrie (Laboratoire d'Interférométrie Stellaire et Exo-planétaire)
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WAVELENGTH SHIFTS !WAVELENGTH SHIFTS !WAVELENGTH SHIFTS !WAVELENGTH SHIFTS !
A new diagnostic tool for stellar physicsenabled by ...
Astrometric radial velocities throughout the Hertzsprung-Russell diagram
High-resolution spectrometers with accurate wavelength calibration
Accurate laboratory wavelengths for several atomic species
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The End
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...
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Astrometric radial
velocities from
perspective
acceleration
Dravins, Lindegren & Madsen, A&A
348, 1040
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UNDERSTANDINGUNDERSTANDING STELLARSTELLAR
SURFACESSURFACESUNDERSTANDINGUNDERSTANDING STELLARSTELLAR
SURFACESSURFACES
theory and observations interact about...
Spectral-line strengths
Spectral-line widths Line-profile shapes
Line asymmetries and bisector patterns Time variability in irradiance and
spectrum
Stellar surface imaging Relative & absolute wavelength shifts
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