Results 31 to 40 of about 189,448 (311)
Can Planets Influence the Horizontal Branch Morphology? [PDF]
, 1998 As stars which have planetary systems evolve along the red giant branch and expand, they interact with the close planets. The planets deposit angular momentum and energy into the red giant stars' envelopes, both of which are likely to enhance mass loss ...
Balbus A. S. +8 more
core +2 more sources
Dynamical Substructures of Galactic Globular Clusters I. M5 [PDF]
Journal of Astronomy and Space Sciences, 2004 CCD images to study the dynamical substructure of the globular cluster M5. We investigate the radial variation of ellipticities and position angles using the stellar photometry and the IRAF ellipse task.
Jongwhan Rhee, Young-Jong Sohn
doaj +1 more source
On the serendipitous discovery of a Li-rich giant in the globular cluster NGC 362 [PDF]
, 2015 We have serendipitously identified the first lithium-rich giant star located close to the red giant branch bump in a globular cluster. Through intermediate-resolution FLAMES spectra we derived a lithium abundance of A(Li)=2.55 (assuming local ...
Angelou, George C. +8 more
core +2 more sources
The distance to the Fornax Dwarf Spheroidal Galaxy [PDF]
, 2007 A large multicolour, wide-field photometric database of the Fornax dwarf spheroidal galaxy has been analysed using three different methods to provide revised distance estimates based on stellar populations in different age intervals.
Aaronson +55 more
core +1 more source
Monte Carlo Simulations of Globular Cluster Red Giant Branches [PDF]
Symposium - International Astronomical Union, 1984 Simulations of globular cluster luminosity functions have shown that many of the features observed in actual clusters are probably statistical fluctuations. We suggest one new way of looking at the data which may ultimately lead to some information about the physical parameters of clusters.
Deborah A. Crocker, Robert T. Rood
openaire +1 more source
Red-giant branch stellar cores as macroscopic dark matter detectors
Physical Review D, 2022 We show that macroscopic dark matter (DM) impacts on the degenerate helium cores of red-giant branch (RGB) stars can ignite helium fusion via DM-baryon elastic scattering. The onset of helium burning leads to a characteristic drop in luminosity and rise in temperature that marks the transition to a horizontal branch star.
Christopher Dessert, Zachary Johnson
openaire +4 more sources
Red Clump stars in Kepler open cluster NGC 6819
EPJ Web of Conferences, 2015 We measure the large frequency separation, Δν, and the frequency of maximum amplitude, νmax, for 10 Red Clump (RC) single member (SM) stars in the Kepler open cluster NGC 6819. We derive luminosities and masses for each individual RC star.
Abedigamba O.P. +2 more
doaj +1 more source
CHEMICAL COMPOSITION OF ATMOSPHERES OF COOL GIANT STARS
Odessa Astronomical Publications, 2017 Results of determination of abundances of chemical elements in the atmospheres of 57 giant stars of the oxygen sequence of the Galactic disk axe given.
N. S. Komarov
doaj +1 more source
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
Quantifying Uncertainties on the Tip of the Red Giant Branch Method
The Astronomical Journal, 2023 We present an extensive grid of numerical simulations quantifying the uncertainties in measurements of the tip of the red giant branch (TRGB). These simulations incorporate a luminosity function composed of 2 mag of red giant branch (RGB) stars leading ...
Barry F. Madore +3 more
doaj +1 more source