Results 71 to 80 of about 1,859,132 (364)
The horizontal branch in the UV colour–magnitude diagrams – II. The case of M3, M13 and M79 [PDF]
, 2012 We present a detailed comparison between far-ultraviolet (UV)/optical colour–magnitude diagrams obtained with high-resolution Hubble Space Telescope data and suitable theoretical models for three Galactic globular clusters: M3, M13 and M79.These systems ...
E. Dalessandro +4 more
semanticscholar +1 more source
Horizontal Branch A- and B-type Stars in Globular Clusters [PDF]
, 2004 Globular clusters offer ideal laboratories to test the predictions of stellar evolution. When doing so with spectroscopic analyses during the 1990s, however, the parameters we derived for hot horizontal branch stars deviated systematically from theoretical predictions.
arxiv +1 more source
On the horizontal branch of the galactic globular cluster NGC 2808 [PDF]
Astronomy & Astrophysics, 2006 We present new UV (F218W) data for stars in the central region of the Galactic globular cluster NGC2808, collected with the WFPC2 camera on board of the Hubble Space Telescope. These data together with F439W and F555W-band data and previous ground based observations provide a multifrequency coverage of the cluster stellar population extending up to a ...
Castellani V. +5 more
openaire +6 more sources
The Na-O anticorrelation in horizontal branch stars - III. 47 Tucanae and M 5 [PDF]
, 2012 To check the impact of the multiple population scenario for globular clusters on their horizontal branch (HB), we presen t an analysis of the composition of 110 red HB (RHB) stars in 47 Tucanae and of 61 blue HB (BHB) and 30 RHB stars in M 5.
R. Gratton +12 more
semanticscholar +1 more source
CHEMICAL COMPOSITIONS OF THIN-DISK, HIGH-METALLICITY RED HORIZONTAL-BRANCH FIELD STARS [PDF]
, 2012 We present a detailed abundance analysis and atmospheric parameters of 76 stars from a survey to identify field Galactic red horizontal-branch (RHB) stars.
M. Afşar, C. Sneden, B. For
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.Spatial distribution of microstructure in Inconel 718 3D‐printed with bidirectional strategy with no rotation and chessboard strategy is studied. The former results in a highly ordered arrangement of coarse grains separated by line clusters of dislocation‐dense fine grains. This arrangement is disrupted by the chessboard strategy.
Jalal Al‐Lami +4 more
wiley +1 more source
Can Planets Influence the Horizontal Branch Morphology? [PDF]
, 1998 As stars which have planetary systems evolve along the red giant branch and expand, they interact with the close planets. The planets deposit angular momentum and energy into the red giant stars' envelopes, both of which are likely to enhance mass loss on the red giant branch.
arxiv +1 more source
Red horizontal branch stars: An asteroseismic perspective
Astronomy & Astrophysics, 2023 Robust age estimates of red giant stars are now possible thanks to the precise inference of their mass based on asteroseismic constraints. However, there are cases where such age estimates can be highly precise yet very inaccurate. An example is giants that have undergone mass loss or mass transfer events that have significantly altered their mass.
Massimiliano Matteuzzi +9 more
openaire +3 more sources
IDENTIFYING BLUE HORIZONTAL BRANCH STARS USING THE z FILTER [PDF]
, 2012 In this paper we present a new method for selecting blue horizontal branch (BHB) candidates based on color–color photometry. We make use of the Sloan Digital Sky Survey z band as a surface gravity indicator and show its value for selecting BHB stars from
John J. Vickers, E. Grebel, A. Huxor
semanticscholar +1 more source
Digital Methods for the Fatigue Assessment of Engineering Steels
Advanced Engineering Materials, EarlyView.The use of engineering steels is often limited by their fatigue strength. In the sake of a faster product development, the fatigue behavior can be predicted by machine learning (ML). In this work, ML is applied on a heterogeneous database, covering a wide range of steel types.
Sascha Fliegener +7 more
wiley +1 more source