Results 51 to 60 of about 189,294 (310)

CHEMICAL INHOMOGENEITY IN RED GIANT BRANCH STARS AND RR LYRAE VARIABLES IN NGC 1851: TWO SUBPOPULATIONS IN RED GIANT BRANCH [PDF]

The Astrophysical Journal, 2009
We investigate the red giant branch (RGB) subpopulations of NGC 1851 using Ca uvby photometry. Our color-magnitude diagrams show that the RGB stars have two subpopulations and the RGB stars in NGC 1851 appear to have distinct elemental abundance patterns with the [Ca/H] abundance. We discuss that the elemental abundance patterns can be explained by the
Lee, Jae-Woo, Lee, Jina, Kang, Y W, Lee, Young-Wook, Han, Sang-Il, Joo, Seok-Joo, Rey, Soo-Chang, Yong, David   +7 more
openaire   +2 more sources

Radial pulsations of red giant branch stars [PDF]

Astronomy Letters, 2017
We performed hydrodynamic computations of nonlinear stellar pulsations of population I stars at the evolutionary stages of the ascending red giant branch and the following luminosity drop due to the core helium flash. Red giants populating this region of the Hertzsprung--Russel diagram were found to be the fundamental mode pulsators.
openaire   +2 more sources

Variations in the Na-O anticorrelation in globular clusters: Evidence for a deep mixing episode in red giant branch stars

, 2010
The Na-O anticorrelation seen in almost all globular clusters ever studied using high-resolution spectroscopy is now generally explained by the primordial pollution from the first generation of the intermediate-mass asymptotic giant branch stars to the ...
Baines, Carretta, Carretta, Carretta, Carretta, Cho, Cohen, D'Antona, Decressin, Gratton, Gratton, Ivans, Jae-Woo Lee, Kraft, Kraft, Langer, Lee, Lee, Lee, Sneden, Ventura, Ventura, Ventura   +22 more
core   +1 more source

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, A. P. Milone, Anderson, Anderson, Anderson, Anderson, Bedin, Bedin, Cassisi, D'Antona, G. Piotto, I. R. King, J. Anderson, Kroupa, L. Malavolta, L. R. Bedin, Mackey, Milone, Milone, Momany, Norris, Pancino, Piotto, Piotto, Piotto, Renzini, Rubenstein, S. Villanova, Valdes, Ventura, Villanova, Y. Momany, Yong, Yong, Yong   +34 more
core   +1 more source

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., Barry F. Madore, Bertelli G., Brouillet N., Caldwell N., Cottrell G. A., Dean J. F., Demoulin M., Heckman T. M., Karachentsev V. E., Karachentseva V. E., Salaris M., Shoko Sakai, van der Hulst J. M.   +13 more
core   +3 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, Young Sun Lee, Jae In Jung, Soo-Chang Rey, Jaehyon Rhee, Jae-Woo Lee, Young-Wook Lee, Young Hoon Joe   +7 more
openaire   +2 more sources

An empirical mass-loss law for Population II giants from the Spitzer-IRAC survey of Galactic globular clusters [PDF]

, 2014
The main aim of the present work is to derive an empirical mass-loss (ML) law for Population II stars in first and second ascent red giant branches.
Dalessandro, E., Fabbri, S., Ferraro, F. R., Origlia, L., Pecci, F. Fusi, Rich, R. M., Valenti, E.   +6 more
core   +1 more source

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, CASSISI S, PIOTTO, GIAMPAOLO, BEDIN, LUIGI, ORTOLANI, SERGIO, CASTELLI F, RECIO BLANCO, ALEJANDRA   +6 more
openaire   +3 more sources

Membrane Fusion‐Inspired Nanomaterials: Emerging Strategies for Infectious Disease and Cancer Diagnostics

Advanced Healthcare Materials, EarlyView.
Membrane fusion‐inspired nanomaterials offer transformative potential in diagnostics by mimicking natural fusion processes to achieve highly sensitive and specific detection of disease biomarkers. This review highlights recent advancements in nanomaterial functionalization strategies, signal amplification systems, and stimuli‐responsive fusion designs,
Sojeong Lee, Khulan Nyamzaya, Jueun Han, Yejin Song, Jihee Lee, Jung Hyun Jo, Seungmin Bang, Eun‐Kyung Lim, Seungjoo Haam, Eunjung Kim   +9 more
wiley   +1 more source