Results 41 to 50 of about 11,182,421 (303)
Surface convection in Population II stars [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractThe initial surface abundances of Population II stars have been altered by the interplay between convection, rotational mixing and diffusion. In particular the shallower the outer convection zone the stronger the diffusion impact. We present preliminary results on constraining the extension of the convection zones of Population II stars thanks ...
Laurent Piau, Robert F. Stein
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Radial velocities of population II binary stars. I.
Astronomische Nachrichten, 2002 Here we publish the second list of radial velocities for 91 Hipparcos stars, mostly high transverse velocity binaries without previous radial velocity measurements. The measurements of radial velocities are done with a CORAVEL-type radial velocity spectrometer with an accuracy better than 1 km/s.
Bartkevicius, A., Sperauskas, J.
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Evolving Spectra of Population III Stars: Consequences for Cosmological Reionization [PDF]
, 2003 We examine the significance of the first metal-free stars (Population III) for the cosmological reionization of H I and He II. These stars have unusually hard spectra, with the integrated ionizing photon rates from a Population III stellar cluster for H ...
Shull, J +5 more
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Multiple Populations in Star Clusters
Universe, 2022 We review the multiple population (MP) phenomenon of globular clusters (GCs): i.e., the evidence that GCs typically host groups of stars with different elemental abundances and/or distinct sequences in photometric diagrams.
Antonino P. Milone, Anna F. Marino
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First stars X. The nature of three unevolved carbon-enhanced metal-poor stars
, 2006 Stars: abundances, stars: population II, Galaxy: abundances, stars: AGB and post-AGB Udgivelsesdato ...
Molaro, P. +10 more
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Tracing ωCentauri’s origins: Spatial and chemical signatures of its formation history
Astronomy & AstrophysicsωCentauri (ωCen), with its unmatched chemical complexity, is the most enigmatic Galactic globular cluster (GC). We combine photometric and spectroscopic catalogs to identify distinct stellar populations within ωCen, investigate their spatial distribution
Dondoglio E. +10 more
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The Metallicity Variations Along the Chromosome Maps: The Globular Cluster 47 Tucanae
The Astrophysical Journal, 2023 The “chromosome maps” (ChMs) of globular clusters (GCs) have revealed that these ancient structures are inhomogeneous in metallicity in various ways and in different natures.
A. F. Marino +13 more
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Loneliness is associated with adverse physical and mental health outcomes and remains understudied in children and adolescents undergoing cancer therapy. Pediatric oncology patients may be at increased risk due to medical isolation and disruption of social networks.
Charlotte N. Stahlfeld +5 more
wiley +1 more source
Is there a Population II analogy to the F star lithium dip? [PDF]
Proceedings of the National Academy of Sciences, 1997 Observers have found a small number of lithium-depleted halo stars in the temperature range of the Spite plateau. The current status of the mass-loss hypothesis for producing the observed lithium dip in Population (Pop) I stars is briefly discussed and extended to Pop II stars as a possible explanation for these halo objects. Based
D S, Dearborn, D N, Schramm
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Central Nervous System Tumors Among Infants in Canada: A Report From CYP‐C
Pediatric Blood &Cancer, EarlyView.ABSTRACT Background Central nervous system (CNS) tumors in infants are rare, pose unique clinical challenges, and lack large‐scale evidence‐based data to guide management. This study seeks to describe CNS tumors in Canadian infants and to compare their outcomes with those of older children.
Samuel Sassine +17 more
wiley +1 more source