Results 51 to 60 of about 185,965 (314)
Post-red-giant-branch Planetary Nebulae
, 2023 Common envelope events have been associated with the formation of a planetary nebulae since its proposition more than forty five years ago. However, until recently there have been doubts as to whether a common envelope while the donor is ascending the red giant branch, rather than the subsequent asymptotic red giant branch, would result in a planetary ...
Jones, David +2 more
openaire +2 more sources
Asteroseismic sensitivity to internal rotation along the red-giant branch [PDF]
Astronomy & Astrophysics, 2020 Context. Transport of angular momentum in stellar interiors is currently not well understood. Asteroseismology can provide us with estimates of internal rotation of stars and thereby advances our understanding of angular momentum transport. Aims. We can measure core-rotation rates in red-giant stars and we can place upper bounds on surface-rotation ...
George C. Angelou +5 more
openaire +5 more sources
Metallicity of Globular Cluster M13 from VI CCD Photometry [PDF]
Journal of Astronomy and Space Sciences, 2000 From the VI images of M13, obtained by using 2K CCD camera and the BOAO 1.8m telescope, we derive the (V-I)-V CMD of M13. From the shapes of red giant branch, the magnitude of horizontal branch, and the giant branch bump on the constructed CMD, we ...
Young-Jong Sohn
doaj
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. +6 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. +13 more
core +3 more sources
Giant Planet Engulfment by Evolved Giant Stars: Light Curves, Asteroseismology, and Survivability
The Astrophysical Journal, 2023 About ten percent of Sun-like (1–2 M _⊙ ) stars will engulf a 1–10 M _J planet as they expand during the red giant branch (RGB) or asymptotic giant branch (AGB) phase of their evolution.
Christopher E. O’Connor +3 more
doaj +1 more source
Asteroseismology of KIC 8263801:Is it a member of NGC 6866 and a red clump star? [PDF]
, 2018 We present an asteroseismic analysis of the Kepler light curve of KIC 8263801, a red-giant star in the open cluster NGC 6866 that has previously been reported to be a helium-burning red-clump star.
Basu, Sarbani +4 more
core +2 more sources
, 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 +22 more
core +1 more source
Machine Learning the Tip of the Red Giant Branch
, 2023 18 pages, 11 figures, updated from original version. Accepted for publication in Phys.Rev.D. Revisions include analysis of the variation in the TRGB magnitude, assessment of the use of deep neural networks over other ML methods, an analysis of the ML error as a function of parameter space, and a resolution test to determine the minimum number of data ...
Dennis, Mitchell, Sakstein, Jeremy
openaire +2 more sources
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