Results 51 to 60 of about 1,859,132 (364)
A HELIUM–CARBON CORRELATION ON THE EXTREME HORIZONTAL BRANCH IN ω CENTAURI [PDF]
, 2014 Taking advantage of a recent FORS2/VLT spectroscopic sample of extreme horizontal branch (EHB) stars in ω Cen, we isolate 38 spectra well suited for detailed atmospheric studies and determine their fundamental parameters (Teff, log g, and log N(He)/N(H))
M. Latour +5 more
semanticscholar +1 more source
Helium enhanced stars and multiple populations along the horizontal branch of NGC 2808: direct spectroscopic measurements [PDF]
, 2013 We present an abundance analysis of 96 horizontal branch (HB) stars in NGC 2808, a globular cluster exhibiting a complex multiple stellar population p attern.
Anna F. Marino +18 more
semanticscholar +1 more source
GLOBAL AND NONGLOBAL PARAMETERS OF HORIZONTAL-BRANCH MORPHOLOGY OF GLOBULAR CLUSTERS [PDF]
, 2013 The horizontal-branch (HB) morphology of globular clusters (GCs) is mainly determined by metallicity. However, the fact that GCs with almost the same metallicity exhibit different HB morphologies demonstrates that at least one more parameter is needed to
A. Milone +17 more
semanticscholar +1 more source
Multi-objective design and optimization of squeezed branch pile based on orthogonal test
Scientific Reports, 2023 In recent years, the emergence of the squeezed branch pile has presented a new avenue for civil engineering, offering a distinctive structure and favorable mechanical characteristics.
Ziqi Wang, Cunbao Zhao, Wenyue Zhang
doaj +1 more source
The Origin of Extreme Horizontal Branch Stars [PDF]
The Astrophysical Journal, 1996 Strong mass loss on the red giant branch (RGB) can result in the formation of extreme horizontal branch (EHB) stars. The EHB stars spend most of their He core and shell burning phase at high temperatures and produce copious ultraviolet flux. They have very small hydrogen envelopes and occupy a small range in mass.
Robert W. O'Connell +3 more
openaire +3 more sources
HORIZONTAL BRANCH MORPHOLOGY AND MULTIPLE STELLAR POPULATIONS IN THE ANOMALOUS GLOBULAR CLUSTER M 22 [PDF]
, 2013 M 22 is an anomalous globular cluster that hosts two groups of stars with different metallicity and s-element abundance. The star-to-star light-element variations in both groups, with the presence of individual Na–O and C–N anticorrelations, demonstrates
Anna F. Marino +4 more
semanticscholar +1 more source
Discovery of Blue Hook Stars in the Massive Globular Cluster M54 [PDF]
Astrophys.J. 603 (2004) 135-138, 2003 We present BV photometry centered on the globular cluster M54 (NGC 6715). The color-magnitude diagram clearly shows a blue horizontal branch extending anomalously beyond the zero age horizontal branch theoretical models. These kinds of horizontal branch stars (also called ``blue hook'' stars), which go beyond the lower limit of the envelope mass of ...
arxiv +1 more source
The subdwarf B star SB 290 – A fast rotator on the extreme horizontal branch [PDF]
, 2013 Hot subdwarf B stars (sdBs) are evolved core helium-burning stars with very thin hydrogen envelopes. To form an sdB, the progenitor has to lose almost all of its hydrogen envelope right at the tip of the red giant branch.
S. Geier +5 more
semanticscholar +1 more source
Revista Brasileira de Ortopedia, 2014 Objective:To describe the path of the infrapatellar branch of the saphenous nerve (IBSN) using the medial joint line, anterior tibial tuberosity (ATT), tibial collateral ligament and a horizontal line parallel to the medial joint line that passes over ...
Julio Cesar Gali +6 more
doaj +1 more source
Meikuang Anquan, 2022 The branch hole is the key to ensure the long-distance drilling of directional hole along the target stratum, improve the coverage of directional drilling and accurately explore geological abnormal bodies.
FANG Jun
doaj +1 more source