Results 101 to 110 of about 20,344 (216)

Theoretical expectations for clump red giants as distance indicators [PDF]

, 2000
L. Girardi
openalex   +1 more source

The dimensionality of stellar chemical space using spectra from the Apache Point Observatory Galactic Evolution Experiment

, 2017
Chemical tagging of stars based on their similar compositions can offer new insights about the star formation and dynamical history of the Milky Way. We investigate the feasibility of identifying groups of stars in chemical space by forgoing the use of ...
Bovy, Jo, Price-Jones, Natalie
core   +1 more source

A Long-duration Superflare on the K Giant HD 251108

The Astrophysical Journal
Many giant stars are magnetically active, which causes rotational variability, chromospheric emission lines, and X-ray emission. Large outbursts in these emission features can set limits on the magnetic field strength and thus constrain the mechanism of ...
Hans Moritz Günther, Dheeraj Pasham, Alexander Binks, Stefan Czesla, Teruaki Enoto, Michael Fausnaugh, Franz-Josef Hambsch, Shun Inoue, Hiroyuki Maehara, Yuta Notsu, Jan Robrade, J. H. M. M. Schmitt, P. C. Schneider   +12 more
doaj   +1 more source

Evidence of distant spiral arms in the Galactic disk quadrant IV from VVV red clump giants [PDF]

, 2022
R. Kammers, R. K. Saito, E. Botan, D. Minniti, J. Alonso-García, Leigh C. Smith, P. W. Lucas   +6 more
openalex   +1 more source

Photospheric Helium Abundance in Cool Giants: A Comprehensive Study

The Astrophysical Journal
High-resolution optical spectra of 16 red giants, two early asymptotic giant branch (AGB) stars, and two supergiants, having no/minimal - to super-lithium (Li)-rich abundances, are analyzed to investigate the helium (He)-enhancement. The spectra of eight
B. P. Hema, Gajendra Pandey
doaj   +1 more source

The red giant branch phase transition: Implications for the RGB luminosity function bump and detections of Li-rich red clump stars [PDF]

, 2015
Santi Cassisi, Maurizio Salaris, Adriano Pietrinferni   +2 more
openalex   +1 more source

The Distance to the Large Magellanic Cloud [PDF]

, 2000
I demonstrate that the two unexpected results in the local Universe: anomalous intrinsic (V-I)_0 colors of RR Lyrae stars and clump giants in the Galactic center, and very short distances to Magellanic Clouds inferred from clump giants, can be at least ...
Popowski, Piotr
core   +2 more sources

The Stellar Populations of the Carina Dwarf Spheroidal Galaxy: I. a New Color-Magnitude Diagram for the Giant and Horizontal Branches

, 1994
We report on the first in a series of studies of the Carina dwarf spheroidal galaxy, a nearby satellite of our Galaxy. Our two major results are: 1) precise BI photometry ($\sigma_{B-I} \simlt 0.05$ for $V \simlt 22$) for 11,489 stars in the Carina field,
Hesser, J. E., Lehnert, M. D., Smecker-Hane, T. A., Stetson, P. B.   +3 more
core   +1 more source

WOCS XCV: NGC 7789: The Evolution of Li, Stellar Rotation, and Extended Main-sequence Turnoff

The Astronomical Journal
Precision UBVRI photometry of NGC 7789 is combined with Gaia data to map reddening variations across the cluster face. Hydra spectra, Gaia astrometry, and isochrone fitting constrain the absolute reddening, apparent modulus, and age, respectively, to E (
Barbara J. Anthony-Twarog, Samantha W. Brunker, Constantine P. Deliyannis, Evan Rich, Aaron Steinhauer, Qinghui Sun, Bruce A. Twarog   +6 more
doaj   +1 more source

Mining the GALAH Data. I. Study of Five Super Lithium-rich Metal-poor Giants

The Astrophysical Journal
The presence of a large amount of Li in giants is still a mystery. Most of the super Li-rich (SLR) giants reported in recent studies are in the solar metallicity regime.
Antony Susmitha, Anohita Mallick, Bacham E. Reddy   +2 more
doaj   +1 more source