Results 31 to 40 of about 180,740 (304)

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

, 2015
We performed a detailed study of the evolution of the luminosity of He-ignition stage and of the red giant branch bump luminosity during the red giant branch phase transition for various metallicities.
Cassisi, Santi, Pietrinferni, Adriano, Salaris, Maurizio   +2 more
core   +2 more sources

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

Can Planets Influence the Horizontal Branch Morphology? [PDF]

, 1998
As stars which have planetary systems evolve along the red giant branch and expand, they interact with the close planets. The planets deposit angular momentum and energy into the red giant stars' envelopes, both of which are likely to enhance mass loss ...
Balbus A. S., Bondi H., Ferraro F. R., Han Z., Harpaz A., Livio M., Noam Soker, Paczynski B., Walker A. R.   +8 more
core   +2 more sources

On the serendipitous discovery of a Li-rich giant in the globular cluster NGC 362 [PDF]

, 2015
We have serendipitously identified the first lithium-rich giant star located close to the red giant branch bump in a globular cluster. Through intermediate-resolution FLAMES spectra we derived a lithium abundance of A(Li)=2.55 (assuming local ...
Angelou, George C., Bragaglia, Angela, Carretta, Eugenio, D'Orazi, Valentina, Gratton, Raffaele G., Lattanzio, John C., Lucatello, Sara, Momany, Yazan, Sollima, Antonio   +8 more
core   +2 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

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

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

Magnetic and non-magnetic AGB mixing for s-processing [PDF]

EPJ Web of Conferences, 2023
I outline a few features of recent models for the formation of the neutron source 13C(α,n)16O in low mass stars (1 ≲ M/M⊙ ≲ 3, LMS ) ascendingfor the second time the Red Giant Branch, generally called Asymptotic Giant Branch, or AGB stars. I also briefly
Busso Maurizio
doaj   +1 more source

Characterisation of red-giant stars in the public Kepler data

, 2011
The first public release of long-cadence stellar photometric data collected by the NASA Kepler mission has now been made available. In this paper we characterise the red-giant (G-K) stars in this large sample in terms of their solar-like oscillations. We
Chaplin, W. J., De Ridder, J., Elsworth, Y., Gilliland, R. L., Hekker, S., Ibrahim, K. A., Kallinger, T., Klaus, T. C., Li, J., Stello, D.   +9 more
core   +5 more sources

The Age Dependent Luminosities of the Red Giant Branch Bump, Asymptotic Giant Branch Bump, and Horizontal Branch Red Clump [PDF]

, 1998
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.
Alongi M., Alves D., Ata Sarajedini, Bertelli G., Bono G., Bono G., Cannon R., Cassisi S., Castellani V., Castellani V., David R. Alves, Ferraro F., Fusi Pecci F., Hesser J., Pulone L., Refsdale S., Thomas H.   +16 more
core   +3 more sources