Results 21 to 30 of about 20,344 (216)

The wobbly Galaxy: kinematics north and south with RAVE red-clump giants [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
The RAVE survey, combined with proper motions and distance estimates, can be used to study in detail stellar kinematics in the extended solar neighbourhood (solar suburb). Using the red clump, we examine the mean velocity components in 3D between an R of 6 and 10 kpc and a Z of -2 to 2 kpc, concentrating on North-South differences.
M. Williams, Matthias Steinmetz, James Binney, A. Siebert, H. Enke, Benoît Famaey, Ivan Minchev, Roelof S. de Jong, C. Boeche, K. C. Freeman, O. Bienaymé, Joss Bland‐Hawthorn, B. K. Gibson, G. Gilmore, E. K. Grebel, A. Helmi, G. Kordopatis, U. Munari, Julio F. Navarro, Q. A. Parker, W. Reid, G. M. Seabroke, Sanjib Sharma, A. Siviero, F. G. Watson, Rosemary F. Ġ. Wyse, T. Zwitter   +26 more
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Probing infrared excess connection with Li enhancement among red clump giants [PDF]

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We have performed a search among low-mass red giants for finding evidence for merger scenario for triggering He-flash and subsequent Li enhancement. We chose a sample of red giants from GALAH survey with well-measured Li abundances, and near- and mid-IR fluxes from 2MASS and WISE surveys, respectively.
Anohita Mallick, Bacham E. Reddy, C. Muthumariappan   +2 more
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Population effects on the red giant clump absolute magnitude: theKband [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
We present a detailed analysis of the behaviour of the Red Clump K-band absolute magnitude (M(K,RC)) in simple and composite stellar populations, in light of its use as standard candle for distance determinations. The advantage of using M(K,RC), following recent empirical calibrations of its value for the solar neighbourhood, arises from its very low ...
Maurizio Salaris, Léo Girardi
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Population effects on the red giant clump absolute magnitude, and distance determinations to nearby galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2001
(Abridged) The red giant clump has been recently argued to be a reliable distance indicator for the galaxies in the Local Group. We re-address the problem of the systematic magnitude differences (DeltaM_I) between the local clump revealed by Hipparcos, and the clump stars observed in distant galaxies.
L. Girardi, M. Salaris
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On the Paradoxical Impact of Blending by Red Clump Giants [PDF]

The Astrophysical Journal, 2020
Abstract The impact of blending by red clump giants (RCGs; or relatively metal-rich red horizontal branch stars) is discussed as it relates to RRab and classical Cepheids, and invariably establishing an improved distance scale. An analysis of Magellanic Cloud variables reaffirms that blending with RCGs may advantageously thrust remote ...
Daniel J. Majaess
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Spectroscopic study of two new super Li-rich red clump K giants [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
In this paper, we report the discovery of two new super Li-rich K giants: HD~24960 and TYC~1751-1713-1. Based on high resolution ($R\approx 60,000$) spectroscopy, we have derived Li abundance of A(Li)$\approx$4.0~dex for both stars. Other elemental abundances are normal of typical K giants. Low ratios of [C/N] $\leq$ $-$ 0.25 and $^{12}C/^{13}C \leq10$
Raghubar Singh, Bacham E. Reddy, Yerra Bharat Kumar   +2 more
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What causes clumps in winds from red supergiants and asymptotic giant branch stars? [PDF]

Proceedings of 11th European VLBI Network Symposium & Users Meeting — PoS(11th EVN Symposium), 2016
A. M. S. Richards, Khudhair A. Assaf, A. Baudry, Roger J. Davis, L. Decin, Moshe Elitzur, S. Etoka, S. T. Garrington, M. D. Gray, Е. Е. Лехт, Jeremy Lim, Iain McDonald, E. Mendoza, K. Murakawa, G. M. Rudnitskij, Huib Jan van Langevelde, M. Wittkowski, J. A. Yates   +17 more
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Zeroing the Stellar Isochrone Scale: The Red Giant Clump Luminosity at Intermediate Metallicity [PDF]

The Astronomical Journal, 1999
The color-magnitude diagrams of the open clusters NGC 2420 and NGC 2506 have been investigated as intermediate links between the solar neighborhood and the Magellanic Clouds. Two sets of theoretical isochrones which include convective overshoot are zeroed to the sun at solar abundance and to the unevolved main sequence dwarfs of the Hipparcos catalog ...
Bruce A. Twarog, Barbara J. Anthony-Twarog, Andrew R. Bricker   +2 more
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Li Enrichment in Red Clump Giants: Clues for Past Binary Interaction or Merger Events

The Astrophysical Journal Letters
To understand the underlying mechanisms of high Li abundances among core He-burning or red clump (RC) giants, we analyzed a sample of 5227 RC giants of mass M ≤ 2 M _⊙ using spectra and asteroseismic data.
Raghubar Singh, Bacham E. Reddy, Anohita Mallick, Gang Zhao   +3 more
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The Age‐dependent Luminosities of the Red Giant Branch Bump, Asymptotic Giant Branch Bump, and Horizontal Branch Red Clump [PDF]

The Astrophysical Journal, 1999
Color-magnitude diagrams of globular clusters often exhibit a prominent horizontal branch (HB) and may also show features such as the red giant branch (RGB) bump and the asymptotic giant branch (AGB) bump. Stellar evolution theory predicts that the luminosities of these features will depend on the metallicity and age of the cluster.
David R. Alves, Ata Sarajedini
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