Results 61 to 70 of about 1,859,132 (364)
THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22), [PDF]
, 2013 The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years.
A. Kunder +12 more
semanticscholar +1 more source
The Identification of Blue Horizontal Branch Stars in the Integrated Spectra of Globular Clusters [PDF]
Astrophys.J. 608 (2004) L33-L36, 2004 A major uncertainty in the spectroscopic dating of extragalactic globular clusters concerns the degenerate effect that age and horizontal branch morphology have on the strength of Balmer lines. In this Letter we show that the ratio between the equivalent widths of Hdelta and Hbeta is far more sensitive to horizontal branch morphology than to age, thus ...
arxiv +1 more source
Pulsational instabilities in hot pre-horizontal branch stars
EPJ Web of Conferences, 2017 The ϵ mechanism is a self-excitation mechanism of pulsations which acts on the regions where nuclear burning takes place. It has been shown that the ϵ mechanism can excite pulsations in models of hot helium-core flash, and that the pulsations of LS IV-14·
Battich Tiara +3 more
doaj +1 more source
Gaps in the blue horizontal branch.
The Astrophysical Journal, 1976 Data leads to the conclusion that several distinct groups of stars exist on the field stars horizontal branch sequence. Consideration of current understanding of the advanced evolution of Population II stars indicates that, if Greenstein's (1971) ''extended horizontal-branch'' hypothesis is correct, these discrete horizontal-branch groups correspond to
J.A. Graham, B. Newell
openaire +2 more sources
The Milky Way’s Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from the Kinematics of ~2400 SDSS Blue Horizontal-Branch Stars [PDF]
, 2008 We derive new constraints on the mass of the Milky Way’s dark matter halo, based on 2401 rigorously selected blue horizontal-branch halo stars from SDSS DR6.
X. Xue +18 more
semanticscholar +1 more source
Journal of Rehabilitation Medicine, 2019 Objective: To identify the anatomical landmarks of tibial motor nerve branches to the gastrocnemii, soleus and tibialis posterior muscles for selective motor nerve blocks in the management of spastic equinovarus foot.
Alessandro Picelli +8 more
doaj +1 more source
KINEMATICS OF THE STELLAR HALO AND THE MASS DISTRIBUTION OF THE MILKY WAY USING BLUE HORIZONTAL BRANCH STARS [PDF]
, 2012 Here, we present a kinematic study of the Galactic halo out to a radius of ∼60 kpc, using 4664 blue horizontal branch stars selected from the SDSS/SEGUE survey to determine key dynamical properties.
P. Kafle +3 more
semanticscholar +1 more source
BV Stellar Photometry of 23 Galactic Globular Clusters [PDF]
Journal of Astronomy and Space Sciences, 1998 We report V-(B - V) CCD Color Magnitude Diagrams (CMDs) for 23 southern Galactic globular clusters. Limiting magnitudes for each cluster are between 18 and 20 magnitudes in V.
Young-Jong Sohn +2 more
doaj
Horizontal Branch Evolution and Atomic Diffusion
The Astrophysical Journal, 2007 Stellar evolution models of a 0.8 Msolar star (Y=0.2352, Z=0.0001, ?=0.3) have been calculated in detail from the zero-age main sequence to the horizontal branch, both with and without atomic diffusion. We analyze the effects of atomic diffusion on the horizontal branch models themselves, as well as on the properties of giant-branch tip stars that ...
Jacques Richer +3 more
openaire +3 more sources
Planets around Extreme Horizontal Branch Stars [PDF]
AIP Conference Proceedings, 2011 We review three main results of our recent study: We show that a proper treatment of the tidal interaction prior to the onset of the common envelope (CE) leads to an enhance mass loss. This might increase the survivability of planets and brown dwarfs that enter a CE phase.
Ealeal Bear +4 more
openaire +6 more sources