65 citations · 209 across the 22 of their papers we have counts for
9 papers · 1 filter
Solar photospheric spectrum microvariability
Dainis Dravins, Hans-Günter Ludwig
Finding low-mass planets around solar-type stars requires to understand the physical variability of the host star, which greatly exceeds the planet-induced radial-velocity modulati…
Solar photospheric spectrum microvariability II. Observed relations to magnetic activity and radial-velocity modulation
Dainis Dravins, Hans-Günter Ludwig
Searches for small exoplanets around solar-type stars are limited by stellar physical variability. While chromospheric variability is well studied, observing, modeling. and underst…
Solar Photospheric Spectrum Microvariability I. Theoretical searches for proxies of radial-velocity jittering
Dainis Dravins, Hans-Günter Ludwig
Extreme precision radial-velocity spectrometers enable extreme precision stellar spectroscopy. Searches for low-mass exoplanets around solar-type stars are limited by the physical…
Astrometric radial velocities for nearby stars
Lennart Lindegren, Dainis Dravins
Under certain conditions, stellar radial velocities can be determined from astrometry, without any use of spectroscopy. This enables us to identify phenomena, other than the Dopple…
Spatially resolved spectroscopy across stellar surfaces. IV. F, G, & K-stars: Synthetic 3D spectra at hyper-high resolution
Dainis Dravins, Hans-Günter Ludwig, Bernd Freytag
High-precision stellar analyses require hydrodynamic 3D modeling. Such models predict changes across stellar disks of spectral line shapes, asymmetries, and wavelength shifts. For…
Science opportunities enabled by the era of Visible Band Stellar Imaging with sub-100 μarc-sec angular resolution
D. Kieda, Monica Acosta, Anastasia Barbano +8
This white paper briefly summarizes stellar science opportunities enabled by ultra-high resolution (sub-100 μ arc-sec) astronomical imaging in the visible (U/V) wavebands. Next gen…