Nebular abundances of southern symbiotic stars [PDF]
, 2005 We have calculated relative elemental abundances for a sample of 43 symbiotic stars. Helium abundances and the relative elemental abundances N/O, Ne/O, Ar/O were derived from new spectra collected in the optical range through low dispersion spectroscopy.
Almog +33 more
arxiv +3 more sources
Non-LTE Abundances of Magnesium, Aluminum and Sulfur in OB Stars Near the Solar Circle [PDF]
Astron.Astrophys. 399 (2003) 525-530, 2002 Non-LTE abundances of magnesium, aluminum and sulfur are derived for a sample of 23 low-v \sin i stars belonging to six northern OB associations of the Galactic disk within 1 kpc of the Sun. The abundances are obtained from the fitting of synthetic line profiles to high resolution spectra.
Afflerbach +21 more
arxiv +5 more sources
Constraining solar abundances using helioseismology [PDF]
Astrophys.J. 606 (2004) L85, 2004 Recent analyses of solar photospheric abundances suggest that the oxygen abundance in the solar atmosphere needs to be revised downwards. In this study we investigate the consequence of this revision on helioseismic analyses of the depth of the solar convection zone and the helium abundance in the solar envelope and find no significant effect.
Antia, H. M., Basu, Sarbani
arxiv +5 more sources
Solar and stellar photospheric abundances
Living Reviews in Solar Physics, 2016 The determination of photospheric abundances in late-type stars from spectroscopic observations is a well-established field, built on solid theoretical foundations.
Carlos Allende Prieto
doaj +4 more sources
The Interaction Between Accretion from the Interstellar Medium and Accretion from the Evolved Binary Component in Barium Stars [PDF]
Journal of Astronomy and Space Sciences, 2018 The reanalysis of the previously published abundance pattern of mild barium star HD202109 (ζ Cyg) and the chemical compositions of 129 thin disk barium stars facilitated the search for possible correlations of different stellar parameters with second ...
Yeuncheol Jeong +2 more
doaj +1 more source
MODELING MICROBIAL ABUNDANCES AND DYSBIOSIS WITH BETA-BINOMIAL REGRESSION. [PDF]
Annals of Applied Statistics, 2019 Using a sample from a population to estimate the proportion of the population with a certain category label is a broadly important problem. In the context of microbiome studies, this problem arises when researchers wish to use a sample from a population ...
Bryan D. Martin, D. Witten, A. Willis
semanticscholar +1 more source
Mass–Metallicity Trends in Transiting Exoplanets from Atmospheric Abundances of H2O, Na, and K [PDF]
Astrophysical Journal, 2019 Atmospheric compositions can provide powerful diagnostics of formation and migration histories of planetary systems. We investigate constraints on atmospheric abundances of H2O, Na, and K, in a sample of transiting exoplanets using the latest ...
L. Welbanks +5 more
semanticscholar +1 more source
Retrieving Temperatures and Abundances of Exoplanet Atmospheres with High-resolution Cross-correlation Spectroscopy [PDF]
Astronomical Journal, 2018 High-resolution spectroscopy (R ≥ 25,000) has recently emerged as one of the leading methods for detecting atomic and molecular species in the atmospheres of exoplanets.
M. Brogi, M. Line
semanticscholar +1 more source
Meta-analysis reveals declines in terrestrial but increases in freshwater insect abundances
Science, 2020 Local drivers of decline matter Recent studies have reported alarming declines in insect populations, but questions persist about the breadth and pattern of such declines. van Klink et al.
Roel van Klink +5 more
semanticscholar +1 more source
Elemental and molecular abundances in comet 67P/Churyumov-Gerasimenko [PDF]
Monthly notices of the Royal Astronomical Society, 2019 Comets are considered to be some of the most pristine and unprocessed Solar system objects accessible to in situ exploration. Investigating their molecular and elemental composition takes us on a journey back to the early period of our Solar system and
M. Rubin +20 more
semanticscholar +1 more source