Results 41 to 50 of about 182,899 (301)

Metallicities of Globular Clusters m3 and m5 from VI CCD Photometry [PDF]

Journal of Astronomy and Space Sciences, 2000
To derive the metallicities of M3 and M5, we used the shape of red giant branch, horizontal branch magnitude, and red giant branch bump on the (V - I) - V color magnitude diagrams.
Young-Jong Sohn, Hyun-Chul Lee
doaj   +2 more sources

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, Jamie Tayar, Daniel Huber, Sten Hasselquist, Richard R. Lane   +4 more
doaj   +1 more source

HIPPARCOS CALIBRATION OF THE TIP OF THE RED GIANT BRANCH [PDF]

The Astrophysical Journal, 2009
We have detected the tip of the Red Giant Branch (TRGB) in the solar neighborhood using near infrared photometry from the 2MASS and DIRBE catalogs, and revised Hipparcos parallaxes. We confirm that the revised Hipparcos parallaxes are superior to the original ones, and that this improvement is necessary to detect the TRGB.
V. Tabur, László L. Kiss, Timothy R. Bedding   +2 more
openaire   +2 more sources

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, Kohei Hattori, Norita Kawanaka, Tomoya Kinugawa, Minori Shikauchi, Daichi Tsuna   +5 more
doaj   +1 more source

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 ...
Igor O. Drozdovsky, Regina E. Schulte-Ladbeck, Mich`ele Belfort, Ulrich Hopp   +3 more
openaire   +3 more sources

IS DUST FORMING ON THE RED GIANT BRANCH IN 47 Tuc? [PDF]

The Astrophysical Journal, 2010
Using Spitzer IRAC observations from the SAGE-SMC Legacy program and archived Spitzer IRAC data, we investigate dust production in 47 Tuc, a nearby massive Galactic globular cluster. A previous study detected infrared excess, indicative of circumstellar dust, in a large population of stars in 47 Tuc, spanning the entire Red Giant Branch (RGB).
Margaret Meixner, Iain McDonald, Jacco Th. van Loon, Miwa Block, Marilyn R. Meade, Joseph L. Hora, Marta Sewilo, Charles W. Engelbracht, Barbara A. Whitney, Karl Misselt, Remy Indebetouw, S. Bracker, Brian Babler, Bernie Shiao, Karl D. Gordon, Martha L. Boyer   +15 more
openaire   +3 more sources

An abundance study of red-giant-branch stars in the Hercules dwarf spheroidal galaxy [PDF]

, 2010
Using high-resolution spectroscopy, we provide a determination of [Fe/H] and [Ca/H] for confirmed red-giant branch member stars of the Hercules dwarf spheroidal galaxy.
A. Koch, Adén, Adén, Alonso, Andrievsky, Aoki, Asplund, Belokurov, Bensby, Burris, Calamida, Calamida, Clem, Cohen, D. Adén, Dotter, E. K. Grebel, Edvardsson, Feltzing, Frebel, Frebel, Fulbright, Fulbright, Geisler, Gilmore, Gratton, Gratton, Gratton, Grebel, Grevesse, Gustafsson, Hanson, Helmi, Ivans, Ivans, Johnson, K. Eriksson, Kirby, Kirby, Kirby, Koch, Koch, Koch, Koch, Kupka, Kupka, Lind, M. I. Wilkinson, Martin, Matteucci, McWilliam, McWilliam, McWilliam, Nissen, Norris, Pasquini, Piskunov, Prochaska, Reddy, Ryabchikova, Ryan, S. Feltzing, Sadakane, Schlegel, Schörck, Shetrone, Shetrone, Simon, Simon, Starkenburg, Stephens, Tollerud, Tolstoy, VandenBerg, Venn, Walker, Woosley, Zucker   +77 more
core   +1 more source

The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients [PDF]

, 2006
In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. Identify red giant branch stars that are members in a dwarf spheroidal galaxy. 2.
A. Ardeberg, Anthony-Twarog, Aparicio, Armandroff, Ashman, Baade, Bell, Bell, Bellazzini, Bergbusch, Bonanos, Bond, Cardelli, Carney, Carretta, Cioni, Clem, Crawford, Crawford, D. Faria, Dolphin, Fulbright, G. Gilmore, G. M. Wahlgren, Grebel, Grillmair, Grundahl, Gustafsson, Harbeck, Hartwick, Heiter, Hilker, Hodge, I. Lundström, Irwin, Irwin, Kleyna, Koch, Lehnert, Muñoz, Odenkirchen, Olsen, Olsen, Olsen, Olsen, Olszewski, P. Linde, S. Feltzing, Schlegel, Schuster, Schuster, Shapley, Shetrone, Shetrone, Smith, Stetson, Stetson, Stetson, Wilkinson, Zinn, Zinn, Zinn, Zinn   +62 more
core   +2 more sources

Dynamical Substructures of Galactic Globular Clusters I. M5 [PDF]

Journal of Astronomy and Space Sciences, 2004
CCD images to study the dynamical substructure of the globular cluster M5. We investigate the radial variation of ellipticities and position angles using the stellar photometry and the IRAF ellipse task.
Jongwhan Rhee, Young-Jong Sohn
doaj   +1 more source

On the discrete nature of the red giant branch of ω Centauri [PDF]

Monthly Notices of the Royal Astronomical Society, 2005
We report the results of an extensive VLT high-resolution imaging campaign of the central region of the giant globular cluster omega Centauri. More than 100,000 stars have been measured in the inner 9'x 9' region of the cluster. On the basis of multiband Colour Magnitude Diagrams (CMD), we confirm the existence of multiple stellar populations along the
SOLLIMA, ANTONIO, FERRARO, FRANCESCO ROSARIO, Pancino E., Bellazzini M.   +3 more
openaire   +4 more sources