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of 5 004
pro vyhledávání: '"Lehmann Christian"'
Sun-like stars are well represented in the solar neighbourhood but are currently under-utilised, with many studies of chemical and kinematic evolution focusing on red giants (which can be observed further away) or turn-off stars (which have well meas
Externí odkaz:
http://arxiv.org/abs/2412.09128
Autor:
Menon, Vignesh V, Wieckowski, Adam, Stoffers, Christian, Brandenburg, Jens, Lehmann, Christian, Bross, Benjamin, Schierl, Thomas, Marpe, Detlev
This paper presents an in-depth analysis of film grain handling in open-source implementations of the Versatile Video Coding (VVC) standard. We focus on two key components: the Film Grain Analysis (FGA) module implemented in VVenC and the Film Grain
Externí odkaz:
http://arxiv.org/abs/2407.12465
Making use of the APOGEE DR17 catalogue with high quality data for 143,509 red giant branch stars we explore the strength of different mechanisms that causes a star to radially migrate in the Milky Way stellar disk. At any position in the disk we fin
Externí odkaz:
http://arxiv.org/abs/2405.19089
Autor:
Lehmann, Christian, Murphy, Michael T., Liu, Fan, Flynn, Chris, Smith, Daniel, Berke, Daniel A.
The Survey for Distant Solar Twins (SDST) aims to find stars very similar to the Sun at distances 1-4 kpc, several times more distant than any currently known solar twins and analogues. The goal is to identify the best stars with which to test whethe
Externí odkaz:
http://arxiv.org/abs/2302.00399
Autor:
Murphy, Michael T., Berke, Daniel A., Liu, Fan, Flynn, Chris, Lehmann, Christian, Dzuba, Vladimir A., Flambaum, Victor V.
The fine structure constant, $\alpha$, sets the strength of the electromagnetic force. The Standard Model of particle physics provides no explanation for its value, which could potentially vary. The wavelengths of stellar absorption lines depend on $
Externí odkaz:
http://arxiv.org/abs/2211.05150
Autor:
Liu, Fan, Murphy, Michael T., Lehmann, Christian, Flynn, Chris, Smith, Daniel, Kos, Janez, Berke, Daniel A., Martell, Sarah L.
Studies of solar twins have key impacts on the astronomical community, but only $\sim$100--200 nearby solar twins ($<$ 1 kpc) have been reliably identified over the last few decades. The aim of our survey (SDST) is to identify $\sim$150--200 distant
Externí odkaz:
http://arxiv.org/abs/2210.09776