Results 81 to 90 of about 1,234,720 (380)
Understanding the various evolutionary stages of the low-mass star-formation process by SO and SO2
Frontiers in Astronomy and Space SciencesSO and SO2 are two potential candidates to trace the different evolutionary phases of the low-mass star-formation process. Here, we report observations of SO and SO2 along with their isotopologues, 34SO and 34SO2, respectively, in four distinct phases of
Rana Ghosh +10 more
doaj +1 more source
Atomic diffusion in the atmosphere of Feige 86
Open Astronomy, 2017 We have revisited the ultraviolet and optical spectra of the blue horizontal branch star Feige 86. The new analysis finds the star cooler and more compact than previously determined. The IUE spectrum of Feige 86 holds numerous unidentified spectral lines
Németh Péter
doaj +1 more source
How Clumpy Star Formation Affects Globular Cluster Systems
Galaxies, 2017 There is now clear evidence the metallicities of globular clusters are not simple tracers of the elemental abundances in their protocluster clouds; some of the heavy elements were formed subsequently within the cluster itself. It is also manifestly clear
Jeremy Bailin
doaj +1 more source
Population Ecology, EarlyView.This study examines the demographic dynamics of two seabird populations on Tromelin Island, 15 years after the eradication of brown rats. The results indicate that these populations are in good health and are expected to continue growing until breeding sites are saturated in about a century.
Merlène Saunier +6 more
wiley +1 more source
Nebular abundances of southern symbiotic stars
, 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
core +1 more source
Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec [PDF]
, 2014 Context. An increasing number of high-resolution stellar spectra is available today thanks to many past and ongoing extensive spectroscopic surveys. Consequently, the scientific community needs automatic procedures to derive atmospheric parameters and ...
Sergi Blanco-Cuaresma +4 more
semanticscholar +1 more source
The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada
Population Ecology, EarlyView.We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley +1 more source
Determining solar abundances using helioseismology [PDF]
, 2006 The recent downward revision of solar photospheric abundances of Oxygen and other heavy elements has resulted in serious discrepancies between solar models and solar structure as determined through helioseismology.
Antia H. M. +8 more
core +2 more sources
The Metallicity and Distance of Leo A from Blue Supergiants
The Astrophysical Journal, 2023 We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope.
Miguel A. Urbaneja +2 more
doaj +1 more source
TEA: A CODE CALCULATING THERMOCHEMICAL EQUILIBRIUM ABUNDANCES [PDF]
, 2015 We present an open-source Thermochemical Equilibrium Abundances (TEA) code that calculates the abundances of gaseous molecular species. The code is based on the methodology of White et al. and Eriksson.
J. Blecic, J. Harrington, M. Bowman
semanticscholar +1 more source