Results 91 to 100 of about 20,344 (216)

Evidence that Mass Loss on the Red Giant Branch Decreases with Metallicity

The Astrophysical Journal
Mass loss on the red giant branch (RGB) influences stellar evolution, properties of stellar populations, and Galactic chemical enrichment, yet remains poorly constrained observationally. Current models provide limited insight into how stellar properties,
Yaguang Li
doaj   +1 more source

Separating the conjoined red clump in the Galactic Bulge: Kinematics and Abundances

, 2011
We have used the AAOMEGA spectrograph to obtain R $\sim 1500$ spectra of 714 stars that are members of two red clumps in the Plaut Window Galactic bulge field $(l,b)=0^{\circ},-8^{\circ}$.
Bullock, Clarkson, Cote, D'Antona, Driver, Houdashelt, Howard, Howard, Ibata, Johnson, Kormendy, Marin-Franch, McWilliam, Muratov, Nataf, Rangwala, Rangwala, Rich, Saunders, Schlegel, Shen, Skrutskie, Vieira   +22 more
core   +1 more source

The Kinematic and Chemical Properties of the Close-in Planet Host Star 8 UMi

The Astrophysical Journal Letters
A recent study by Hon et al. reported that a close-in planet around the red clump star, 8 UMi, should have been engulfed during the expansion phase of its parent star’s evolution.
Huiling Chen, Yang Huang, Wei Zhu, Timothy C. Beers, Renjing Xie, Yutao Zhou, Sharon Xuesong Wang, Wei Wang, Sofya Alexeeva, Qikang Feng, Haozhu Fu, Haining Li, Lile Wang, Huawei Zhang   +13 more
doaj   +1 more source

Color–Magnitude Diagram of NGC 205 and Its RR Lyrae Variables

The Astronomical Journal
We present the deepest color–magnitude diagram (CMD) for NGC 205 in the F606W (≈ V ) and F814W (≈ I ) filters. Our archival Hubble Space Telescope/Advanced Camera for Surveys field is centered ∼3 $\mathop{.}\limits^{{\rm{^{\prime} }}}$ 8 northwest of the
Ata Sarajedini
doaj   +1 more source

High Lithium Abundance Connection with the Chromospheric Helium in Red Giants: Spectroscopic and Asteroseismic Analyses

The Astrophysical Journal
We present a study of correlations between high Li abundances and strong chromospheric He i λ 10830 absorption-line strengths in Kepler field giant stars.
Anohita Mallick, Christopher Sneden, Bacham E. Reddy, Melike Afşar   +3 more
doaj   +1 more source

A Near-infrared Extinction and Reddening Map toward the Galactic Bulge Using UKIRT

The Astronomical Journal
The Galactic bulge is one of the most information-dense regions to study resolved stellar populations, variables, and transients, such as microlensing events.
Aiden S. Zelakiewicz, Samson A. Johnson, B. Scott Gaudi, Geoffrey Bryden, David M. Nataf, Yossi Shvartzvald   +5 more
doaj   +1 more source

Near Infrared properties of 12 Globular Clusters toward the inner Bulge of the Galaxy

, 2009
We present near-IR Colour-Magnitude diagrams and physical parameters for a sample of 12 galactic globular clusters located toward the inner Bulge region.
Alcaino, Alves-Brito, Armandroff, Barbuy, Barbuy, Barbuy, Bica, Bica, Bica, Bica, Carretta, Carretta, Castro, Christian, Cunha, Davidge, Davidge, Davidge, E. Valenti, Eisenhauer, F. R. Ferraro, Ferraro, Ferraro, Ferraro, Frogel, Fulbright, Glass, Harris, Idiart, L. Origlia, Lecureur, Minniti, Montegriffo, Origlia, Origlia, Origlia, Origlia, Ortolani, Ortolani, Ortolani, Ortolani, Ortolani, Ortolani, Ortolani, Ortolani, Ortolani, Rich, Rich, Shara, Stephens, Stetson, Terndrup, Trager, Valenti, Valenti, Valenti, Valenti, Valenti, Weiland, Zinn, Zinn, Zoccali, Zoccali, Zoccali   +63 more
core   +1 more source

The Age–Velocity Dispersion Relations of the Galactic Disk as Revealed by the LAMOST-Gaia Red Clump Stars

The Astrophysical Journal
Using nearly 230,000 red clump stars selected from LAMOST and Gaia, we conduct a comprehensive analysis of the stellar age–velocity dispersion relations (AVRs) for various disk populations, within 5.0 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc.
Weixiang Sun, Han Shen, Biwei Jiang, Xiaowei Liu   +3 more
doaj   +1 more source

Probing the core structure and evolution of red giants using gravity-dominated mixed modes observed with Kepler

, 2012
We report for the first time a parametric fit to the pattern of the \ell = 1 mixed modes in red giants, which is a powerful tool to identify gravity-dominated mixed modes.
Aizenman, B. Mosser, Baudin, Baudin, Beck, Beck, Bedding, Bedding, Borucki, Brassard, Brown, C. Barban, C. J. Burke, Campante, Carrier, Chaplin, Chaplin, Christensen-Dalsgaard, D. Stello, De Ridder, Deheuvels, Deheuvels, di Mauro, Dupret, Dziembowski, Dziembowski, E. Michel, García, Gilliland, Hekker, Hekker, Huber, J. De Ridder, J. P. Marques, Jenkins, Jiang, K. Belkacem, Kallinger, Koch, Ledoux, M. C. Stumpe, M. J. Goupil, Mathur, Mathur, Miglio, Morel, Mosser, Mosser, Mosser, Mosser, Mosser, Mosser, P. G. Beck, Pablo, R. A. García, R. Samadi, S. Hekker, Shibahashi, T. Barclay, T. Kallinger, T. R. Bedding, Tassoul, Verner, White, White, Y. Elsworth   +65 more
core   +3 more sources

James Webb Space Telescope Observations of the Nearby and Precisely Localized FRB 20250316A: A Potential Near-IR Counterpart and Implications for the Progenitors of Fast Radio Bursts

The Astrophysical Journal Letters
We present deep James Webb Space Telescope near-infrared imaging to search for a quiescent or transient counterpart to FRB 20250316A, which was precisely localized with the CHIME Outriggers array to an area of 11 × 13 pc in the outer regions of NGC 4141 ...
Peter K. Blanchard, Edo Berger, Shion E. Andrew, Aswin Suresh, Kohki Uno, Charles D. Kilpatrick, Brian D. Metzger, Harsh Kumar, Navin Sridhar, Amanda M. Cook, Yuxin Dong, Tarraneh Eftekhari, Wen-fai Fong, Walter W. Golay, Daichi Hiramatsu, Ronniy C. Joseph, Victoria M. Kaspi, Mattias Lazda, Calvin Leung, Kiyoshi W. Masui, Juan Mena-Parra, Kenzie Nimmo, Aaron B. Pearlman, Vishwangi Shah, Kaitlyn Shin, Sunil Simha   +25 more
doaj   +1 more source