Webbpopulation properties and the normalisation of the stellar initial mass function (IMF) measured using stellar dynamics, based on a large sample of 260 early-type galaxies observed as part of the ATLAS 3D project. This measure of the IMF normalisation is found to vary non-uniformly with age- and metallicity-sensitive absorption line strengths. Webbför 2 dagar sedan · Among those surveys, the Gaia -ESO Public Spectroscopic Survey, the only one performed on a 8m class telescope, was designed to target 100 000 stars using FLAMES on the ESO VLT (both Giraffe and ...
A-type main-sequence star - Wikipedia
WebbO-type main sequence stars in the Large Magellanic Cloud have lower metallicity (which makes their interiors less opaque than typical stars in the Milky Way) and noticeably … Webb11 feb. 2024 · The atmospheric properties of the stars hosting these wide-orbit companions are not very well studied, and, most notably, the metallicity is known for only 14 such systems. Table 1. Stellar Parameters of DIP Host Stars References. 1. Chen et al. ( 2011 ); 2. Bailey et al. ( 2014 ); 3. Ujjwal et al. ( 2024 ); 4. Chauvin et al. ( 2005 ); 5. clipchamp pty ltd
Host Star Metallicity of Directly Imaged Wide-orbit Planets ...
Webb20 mars 2024 · The metallicities of the young stellar population agree with extragalactic spectroscopic studies of individual massive supergiant stars and are significantly higher than those of the older stellar population. This confirms galaxy evolution models where metallicity depends on the ratio of gas to stellar mass and where this ratio decreases … Webbthe stellar metallicity (Maldonado et al.2015a). Stellar masses and luminosities for M dwarfs were obtained from the derived temperatures and metallicities by using empirical calibrations. The total number of stars in our sample amounts to 551. It is composed of 71 F-type stars, 261 G-type stars, 166 K-type stars, WebbThe correlation between planetary occurrence and metallicity observed in main sequence stars may not extend to giant stars, as several studies have found contradictory results … bobos reviews