Results 21 to 30 of about 180,740 (304)
The Red Giant Branch luminosity function bump [PDF]
Astronomy & Astrophysics, 2003 11 pages, accepted for publication in A& ...
Maurizio Salaris +9 more
openaire +5 more sources
Galactic calibration of the tip of the red giant branch [PDF]
Publications of the Astronomical Society of Australia, 2019 AbstractIndications from Gaia data release 2 are that the tip of the red giant branch (a population II standard candle related to the helium flash in low mass stars) is close to –4 in absolute I magnitude in the Cousins photometric system. Our sample is high-latitude southern stars from the thick disk and inner halo, and our result is consistent with ...
Mould, Jeremy +2 more
openaire +6 more sources
Calibration of the Tip of the Red Giant Branch
The Astrophysical Journal, 2020 Abstract The tip of the red giant branch (TRGB) method provides one of the most accurate and precise means of measuring the distances to nearby galaxies. Here we present a multi-wavelength, VIJHK absolute calibration of the TRGB based on observations of TRGB stars in the Large Magellanic Cloud (LMC), grounded on a geometric distance ...
Andrew J. Monson +9 more
openaire +3 more sources
Magnetic Mixing in Red Giant and Asymptotic Giant Branch Stars [PDF]
The Astrophysical Journal, 2008 The available information on isotopic abundances in the atmospheres of low-mass Red Giant Branch (RGB) and Asymptotic Giant Branch (AGB) stars requires that episodes of extensive mixing occur below the convective envelope, reaching down to layers close to the hydrogen burning shell (Cool Bottom Processing).
Jason Nordhaus +4 more
openalex +7 more sources
Red Giant Branch Stars: The Theoretical Framework [PDF]
Publications of the Astronomical Society of the Pacific, 2002 Theoretical predictions of Red Giant Branch stars' effective temperatures, colors, luminosities and surface chemical abundances are a necessary tool for the astrophysical interpretation of the visible--near infrared integrated light from unresolved stellar populations, the Color-Magnitude-Diagrams of resolved stellar clusters and galaxies, and ...
Santi Cassisi +2 more
openaire +3 more sources
The analysis of isochrone fitting methods for red giant branch photometry, and tip red giant branch distance determination [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 We consider the procedure of isochrone fitting and its application to the study of red giant branch (RGB) photometry in old stellar populations. This is extended to consider the problems introduced by the inclusion of lower-magnitude regions of the Colour Magnitude Diagram (CMD).
C. M. Frayn, Gerry Gilmore
openaire +3 more sources
Investigating APOKASC Red Giant Stars with Abnormal Carbon-to-nitrogen Ratios
The Astrophysical Journal, 2023 The success of galactic archeology and the reconstruction of the formation history of our Galaxy relies critically on precise ages for large populations of stars. For evolved stars in the red clump and red giant branch, the carbon-to-nitrogen ratio ([C/N]
Erica Bufanda +4 more
doaj +1 more source
HIPPARCOS CALIBRATION OF THE TIP OF THE RED GIANT BRANCH [PDF]
The Astrophysical Journal, 2009 We have detected the tip of the Red Giant Branch (TRGB) in the solar neighborhood using near infrared photometry from the 2MASS and DIRBE catalogs, and revised Hipparcos parallaxes. We confirm that the revised Hipparcos parallaxes are superior to the original ones, and that this improvement is necessary to detect the TRGB.
V. Tabur +2 more
openaire +2 more sources
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
doaj +1 more source
DUST IS FORMING ALONG THE RED GIANT BRANCH OF 47 Tuc [PDF]
The Astrophysical Journal, 2010 We present additional evidence that dust is really forming along the red giant branch (RGB) of 47 Tuc at luminosities ranging from above the horizontal branch to the RGB-tip (Origlia et al. 2007). The presence of dust had been inferred from an infrared excess in the (K-8) color, with K measured from high spatial resolution ground based near-IR ...
L. Origlia +6 more
openalex +6 more sources