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CYANOGEN IN NGC 1851 RED GIANT BRANCH AND ASYMPTOTIC GIANT BRANCH STARS: QUADRIMODAL DISTRIBUTIONS [PDF]
The Astrophysical Journal, 2012 The Galactic globular cluster NGC 1851 has raised much interest since Hubble Space Telescope photometry revealed that it hosts a double subgiant branch. Here we report on our homogeneous study into the cyanogen (CN) band strengths in the red giant branch (RGB) population (17 stars) and asymptotic giant branch (AGB) population (21 stars) using AAOmega ...
Campbell, S +9 more
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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).
Frayn, C. M., Gilmore, G. F.
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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
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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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Surface effects on the red giant branch [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 13 pages, 7 figures, accepted in ...
W H Ball, N Themeßl, S Hekker
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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).
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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).
Nordhaus J. +4 more
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Li-rich red giant branch stars in the Galactic bulge [PDF]
Astronomy & Astrophysics, 2009 Aims. We present Lithium abundance determination for a sample of K giant stars in the galactic bulge. The stars presented here a re the only 13 stars with detectable Lithium line (6767.18A) among∼400 stars for which we have spectra in this wavelength range, half of them in Baade’s Window (b =−4 ◦ ) and half in a field at b =−6 ◦ . Methods.
O. A. González +9 more
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The Resolved Red Giant Branches of E/S0 Galaxies [PDF]
Astrophysics and Space Science, 2003 Formation paradigms for massive galaxies have long centered around two antipodal hypotheses -- the monolithic-collapse and the accretion/merger scenarios. Empirical data on the stellar contents of galaxy halos is crucial in order to develop galaxy formation and assembly scenarios which have their root in observations, rather than in numerical ...
Schulte-Ladbeck, Regina E. +3 more
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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
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