Results 51 to 60 of about 189,448 (311)
Dynamical Substructures of Galactic Globular Clusters III. NGC 7006 [PDF]
Journal of Astronomy and Space Sciences, 2005 To study the effects of giant population on dynamical substructures of the central region of NGC 7006, we examine the radial variations of ellipticity and position angle on BV stellar photometry using ellipse fitting technique.
Jonghwan Rhee, Young-Jong Sohn
doaj +1 more source
Multiple stellar populations in the Galactic globular cluster NGC 6752
, 2009 We have carried out high-precision photometry on a large number of archival HST images of the Galactic globular cluster NGC 6752, to search for signs of multiple stellar populations. We find a broadened main sequence, and demonstrate that this broadening
A. F. Marino +34 more
core +1 more source
A New Color-Magnitude Diagram for Palomar 11 [PDF]
, 2006 We present new photometry for the Galactic thick disk globular cluster Palomar 11 extending well past the main sequence turn-off in the V and I bands. This photometry shows noticeable red giant and subgiant branches.
Brian Chaboyer +8 more
core +4 more sources
Medium-resolution Spectroscopy of Red Giant Branch Stars in ω Centauri [PDF]
The Astronomical Journal, 2017 Abstract We present [Fe/H] and [Ca/Fe] of ∼600 red giant branch (RGB) members of the globular cluster Omega Centauri ( ). We collect medium-resolution ( ) spectra using the Blanco 4 m telescope at the Cerro ...
Deokkeun An +7 more
openaire +2 more sources
Observation of the Halo of NGC 3077 Near the "Garland" Region Using the Hubble Space Telescope [PDF]
, 2001 We report the detection of upper main sequence stars and red giant branch stars in the halo of an amorphous galaxy, NGC3077. The observations were made using Wide Field Planetary Camera~2 on board the Hubble Space Telescope.
Barbieri C. +13 more
core +3 more sources
Why hot horizontal branch stars can appear redder than red giants [PDF]
Astronomy & Astrophysics, 2003 In this paper we report on a curious feature in the V, (U-B) color-magnitude diagrams of globular clusters. In our database, we find that a considerable fraction of blue horizontal branch stars, hotter than the instability strip and cooler than the Grundahl et al.
AL MOMANY, YAZAN +6 more
openaire +3 more sources
Photon Avalanching Nanoparticles: The Next Generation of Upconverting Nanomaterials?
Advanced Functional Materials, EarlyView.This Perspective outlines the mechanistic foundations that enable photon‐avalanche (PA) behavior in lanthanide nanomaterials and contrasts them with emerging application spaces and forward‐looking design strategies. By bridging threshold engineering, energy‐transfer dynamics, and materials engineering, we provide a coherent roadmap for advancing the ...
Kimoon Lee +7 more
wiley +1 more source
EPJ Web of Conferences, 2015 As the Kepler time series grew, so did the interest in the asteroseismology of very low-frequency solar-like oscillators. It is possible to accurately resolve modes for stars near the tip of the red giant branch.
Compton Douglas L. +2 more
doaj +1 more source
Blue Stragglers After the Main Sequence [PDF]
, 2008 We study the post-main sequence evolution of products of collisions between main sequence stars (blue stragglers), with particular interest paid to the horizontal branch and asymptotic giant branch phases.
Alison Sills +22 more
core +1 more source
CYANOGEN IN NGC 1851 RED GIANT BRANCH AND ASYMPTOTIC GIANT BRANCH STARS: QUADRIMODAL DISTRIBUTIONS [PDF]
The Astrophysical Journal, 2012 The Galactic globular cluster NGC 1851 has raised much interest since Hubble Space Telescope photometry revealed that it hosts a double subgiant branch. Here we report on our homogeneous study into the cyanogen (CN) band strengths in the red giant branch (RGB) population (17 stars) and asymptotic giant branch (AGB) population (21 stars) using AAOmega ...
Campbell, S +9 more
openaire +2 more sources