Physical conditions of the molecular gas in metal-poor galaxies
Sign Up to like & getrecommendations! Published in 2017 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201731000
Abstract: Studying the molecular component of the interstellar medium (ISM) in metal-poor galaxies has been challenging because of the faintness of carbon monoxide emission, the most common proxy of H2. Here we present new detections of… read more here.
Keywords: metal poor; physical conditions; molecular gas; gas ... See more keywords
TOPoS. IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201732320
Abstract: Context. Extremely metal-poor (EMP) stars provide us with indirect information on the first generations of massive stars. The TOPoS survey has been designed to increase the census of these stars and to provide a chemical… read more here.
Keywords: poor stars; metal poor; sdss; extremely metal ... See more keywords
Cool stars in the Galactic center as seen by APOGEE
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202038327
Abstract: The Galactic Center region, including the nuclear disk, has until recently been largely avoided in chemical census studies because of extreme extinction and stellar crowding. Making use of the latest APOGEE data release (DR16), we… read more here.
Keywords: metal poor; cool stars; galactic center; stars galactic ... See more keywords
Inhomogeneity in the early Galactic chemical enrichment exposed by beryllium abundances in extremely metal-poor stars
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202039101
Abstract: Abundances of beryllium in metal-poor stars scale linearly with metallicity down to [Fe/H] ~ -3.0. In the stars where Be has been detected at this extremely metal-poor regime, an increased abundance scatter has been previously… read more here.
Keywords: poor stars; metal poor; abundances extremely; inhomogeneity early ... See more keywords
Sodium Abundances in Very Metal-poor Stars
Sign Up to like & getrecommendations! Published in 2023 at "Research in Astronomy and Astrophysics"
DOI: 10.1088/1674-4527/accdc3
Abstract: Chemical composition of very metal-poor (VMP) stars can provide observational constraints on current models of nucleosynthesis and the chemical evolution of the Galaxy. It had been found that the scatter of [Na/Fe] versus [Fe/H] in… read more here.
Keywords: poor stars; sodium abundances; abundances metal; metal poor ... See more keywords
NGTS-21b: An Inflated Super-Jupiter Orbiting a Metal-poor K dwarf
Sign Up to like & getrecommendations! Published in 2022 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stac2884
Abstract: We report the discovery of NGTS-21b , a massive hot Jupiter orbiting a low-mass star as part of the Next Generation Transit Survey (NGTS). The planet has a mass and radius of 2.36 ± 0.21 MJ and 1.33… read more here.
Keywords: dwarf; ngts 21b; metal poor; jupiter orbiting ... See more keywords
Spatially-resolved chemodynamics of the starburst dwarf galaxy CGCG 007-025: Evidence for recent accretion of metal-poor gas
Sign Up to like & getrecommendations! Published in 2022 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1087
Abstract: Nearby metal-poor starburst dwarf galaxies present a unique opportunity to probe the physics of high-density star formation with a detail and sensitivity unmatched by any observation of the high-z Universe. Here we present the first… read more here.
Keywords: cgcg 007; gas; 007 025; starburst dwarf ... See more keywords
The Pristine survey - XXI: exploring the metal-poor boundary with ESPaDoNS
Sign Up to like & getrecommendations! Published in 2023 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stad1291
Abstract: In this paper we study high resolution spectra of 19 stars that have metallicity estimates below –3.5 using at least two metallicity sensitive photometric indices based on Pristine photometry. The purpose is to understand what… read more here.
Keywords: eclipsing binaries; photometry; variable stars; survey ... See more keywords
The oldest and most metal-poor stars in the APOSTLE Local Group simulations.
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stw2873
Abstract: We examine the spatial distribution of the oldest and most metal-poor stellar populations of Milky Way-sized galaxies using the A Project Of Simulating The Local Environment (APOSTLE) cosmological hydrodynamical simulations of the Local Group. In… read more here.
Keywords: oldest metal; poor stars; metal poor; local group ... See more keywords
Primeval very low-mass stars and brown dwarfs -- II. The most metal-poor substellar object
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx350
Abstract: SDSS J010448.46+153501.8 has previously been classified as an sdM9.5 subdwarf. However, its very blue $J-K$ colour ($-0.15 \pm 0.17$) suggests a much lower metallicity compared to normal sdM9.5 subdwarfs. Here, we re-classify this object as… read more here.
Keywords: sdss j010448; substellar object; metal poor; mass ... See more keywords
The extended He II λ4686 emission in the extremely metal-poor galaxy SBS 0335 - 052E seen with MUSE
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty1920
Abstract: This study in based on observations collected at the European Southern Observatory. We are very grateful to our referee for providing constructive comments and help in improving the manuscript. This work has been partially funded… read more here.
Keywords: metal poor; extremely metal; poor galaxy; extended 4686 ... See more keywords