Search for a Black Hole Binary in Gaia DR3 Astrometric Binary Stars with Spectroscopic Data
The Astrophysical Journal, 2023 We report the discovery of a candidate binary system consisting of a black hole (BH) and a red giant branch star in Gaia DR3. This binary system was discovered from 64,108 binary solutions for which both astrometric and spectroscopic data are available ...
Ataru Tanikawa +5 more
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An abundance study of red-giant-branch stars in the Hercules dwarf spheroidal galaxy [PDF]
, 2010 Using high-resolution spectroscopy, we provide a determination of [Fe/H] and [Ca/H] for confirmed red-giant branch member stars of the Hercules dwarf spheroidal galaxy.
A. Koch +77 more
core +1 more source
Theoretical Red-Giant Branches for Globular Clusters [PDF]
Symposium - International Astronomical Union, 1984 VandenBerg (1983a; hereinafter V) has recently computed a large grid of stellar evolutionary sequences from the zero-age main sequence to the base of the red-giant branch (RGB) and carried out extensive comparisons of the associated isochrones with published photometry of globular clusters (GCs).
openaire +1 more source
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
The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients [PDF]
, 2006 In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. Identify red giant branch stars that are members in a dwarf spheroidal galaxy. 2.
A. Ardeberg +62 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
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
The red giant branch phase transition: Implications for the RGB luminosity function bump and detections of Li-rich red clump stars [PDF]
, 2015 We performed a detailed study of the evolution of the luminosity of He-ignition stage and of the red giant branch bump luminosity during the red giant branch phase transition for various metallicities.
Cassisi, Santi +2 more
core +2 more sources
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
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
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