Results 81 to 90 of about 20,344 (216)

Metallicity of the Double Red Clump in the Milky Way Bulge

The Astrophysical Journal
We present a reanalysis of the metallicity of the double red clump (RC) stars from the Milky Way bulge. Two leading explanations for the existence of the double RC concern possible differences in chemical composition (multiple populations of stars) or ...
Zofia Budzik, Matylda Łukaszewicz, Radosław Poleski   +2 more
doaj   +1 more source

Tracking the Evolution of Lithium in Giants Using Asteroseismology: Super-Li-rich Stars Are Almost Exclusively Young Red-clump Stars [PDF]

, 2021
Raghubar Singh, Bacham E. Reddy, S. W. Campbell, Yerra Bharat Kumar, Mathieu Vrard   +4 more
openalex   +1 more source

Asteroseismic classification of stellar populations among 13000 red giants observed by Kepler

, 2013
Of the more than 150000 targets followed by the Kepler Mission, about 10% were selected as red giants. Due to their high scientific value, in particular for Galaxy population studies and stellar structure and evolution, their Kepler light curves were ...
Bedding, T. R., Benomar, O., Bildsten, L., Elsworth, Y. P., Gilliland, R. L., Huber, D., Mosser, B., Paxton, B., Stello, D., White, T. R.   +9 more
core   +3 more sources

Exploring the History of Stellar Mergers with Chemistry: Examining the Origins of Massive α-enriched Stars Using Carbon Isotope Ratios

The Astrophysical Journal
Recently discovered massive α -enriched (MAE) stars have surface chemistry consistent with members of the older, thick-disk Milky Way population but high masses (∼1.5–3 M _⊙ ) that suggest these stars are young.
Zachary G. Maas, Keith Hawkins, Jeffrey M. Gerber, Zoe Hackshaw, Catherine Manea   +4 more
doaj   +1 more source

A super lithium-rich red-clump star in the open cluster Trumpler 5

, 2014
Context. The existence of lithium-rich low-mass red giant stars still represents a challenge for stellar evolution models. Stellar clusters are privileged environments for this kind of investigation. Aims. To investigate the chemical abundance pattern of
Ahumada, J. A., Beccari, G., Beletsky, Y., Boffin, H. M. J., Bonifacio, P., Caffau, E., Carraro, G., Monaco, L., Steffen, M., Villanova, S.   +9 more
core   +3 more sources

Project AMIGA: Distance and Metallicity Gradients along Andromeda’s Giant Southern Stream from the Red Clump^∗ [PDF]

The Astronomical Journal, 2018
Abstract The Giant Southern Stream (GSS) of M31, a keystone signature of a major accretion event, yields crucial constraints on M31 formation and evolution models. Currently, our understanding of the GSS, in terms of both its geometry and its chemistry, results from either wide-field imaging probing only a few magnitudes below the red ...
Roger E. Cohen, Jason S. Kalirai, Karoline M. Gilbert, Puragra Guhathakurta, Molly S. Peeples, Nicolas Lehner, Thomas M. Brown, Luciana Bianchi, Kathleen A. Barger, John M. O’Meara   +9 more
openaire   +2 more sources

Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters [PDF]

, 2010
Clear power excess in a frequency range typical for solar-type oscillations in red giants has been detected in more than 1000 stars, which have been observed during the first 138 days of the science operation of the NASA Kepler satellite.
Basu, S., Bedding, T. R., Borucki, W. J., Bruntt, H., Chaplin, W. J., Christensen-Dalsgaard, J., De Ridder, J., Elsworth, Y. P., Frandsen, S., Garcia, R. A., Gilliland, R. L., Gruberbauer, M., Hekker, S., Huber, D., Kallinger, T., Kjeldsen, H., Koch, D. G., Mathur, S., Matthews, J. M., Mosser, B., Stello, D.   +20 more
core   +4 more sources

The Red Giant Branch Tip and Bump of the Leo II dwarf spheroidal galaxy

, 2005
We present V and I photometry of a 9.4' X 9.4' field centered on the dwarf spheroidal galaxy Leo II. The Tip of the Red Giant Branch is identified at I^{TRGB}=17.83 +/- 0.03 and adopting = -1.53 +/- 0.2 from the comparison of RGB stars with Galactic ...
Alard, Alard, Azzopardi, Bellazzini, Bellazzini, Bellazzini, Bellazzini, Bellazzini, Bellazzini, Bellazzini, Bosler, Cacciari, Cacciari, Carretta, Clementini, Dean, Demers, Demers, F. R. Ferraro, Ferraro, Fusi Pecci, Fusi Pecci, Gallart, Galleti, Harbeck, Harrington, Iben, Kaluzny, Laird, Lee, Lee, Lee, M. Bellazzini, Madore, Madore, Majewski, Mateo, McConnachie, Mendez, Mighell, Monaco, Monaco, N. Gennari, Pancino, Renzini, Robin, Sakai, Salaris, Salaris, Schecter, Schlegel, Siegel, Sollima, Stetson, Vogt, Walker, Zinn, Zoccali   +57 more
core   +1 more source

Modeling Asteroseismic Yields for the Roman Galactic Bulge Time-domain Survey

The Astrophysical Journal
The Galactic Bulge Time-Domain Survey (GBTDS) of the Roman Space Telescope will take high-cadence data of the Galactic bulge. We investigate the asteroseismic potential of this survey for red giants.
Trevor J. Weiss, Noah J. Downing, Marc H. Pinsonneault, Joel C. Zinn, Dennis Stello, Timothy R. Bedding, Kaili Cao, Marc Hon, Claudia Reyes, B. Scott Gaudi, Robert F. Wilson, Daniel Huber, Sanjib Sharma   +12 more
doaj   +1 more source

Testing the Breakdown of the Asteroseismic Scaling Relations in Luminous Red Giants

The Astrophysical Journal
Nearly all cool, evolved stars are solar-like oscillators, and fundamental stellar properties can be inferred from these oscillations with asteroseismology.
Amanda L. Ash, Marc H. Pinsonneault, Mathieu Vrard, Joel C. Zinn   +3 more
doaj   +1 more source