Results 51 to 60 of about 29,336 (265)

Variations in the Na-O anticorrelation in globular clusters: Evidence for a deep mixing episode in red giant branch stars

, 2010
The Na-O anticorrelation seen in almost all globular clusters ever studied using high-resolution spectroscopy is now generally explained by the primordial pollution from the first generation of the intermediate-mass asymptotic giant branch stars to the ...
Baines, Carretta, Carretta, Carretta, Carretta, Cho, Cohen, D'Antona, Decressin, Gratton, Gratton, Ivans, Jae-Woo Lee, Kraft, Kraft, Langer, Lee, Lee, Lee, Sneden, Ventura, Ventura, Ventura   +22 more
core   +1 more source

The Large Magellanic Cloud as a laboratory for hot bottom burning in massive asymptotic giant branch stars [PDF]

, 2015
We use Spitzer observations of the rich population of Asymptotic Giant Branch stars in the Large Magellanic Cloud (LMC) to test models describing the internal structure and nucleosynthesis of the most massive of these stars, i.e.
P. Ventura, A. Karakas, F. Dell’Agli, M. Boyer, D. A. Garc'ia-Hern'andez, M. Criscienzo, R. Schneider   +6 more
semanticscholar   +1 more source

ASYMPTOTIC GIANT BRANCH VARIABLES

Odessa Astronomical Publications, 2017
Asymptotic Giant Branch variable are the brightest and most distinctive individual stars to be found in the resolved, old and inter mediate age, stellar populations of galaxies in the Local Group and beyond.
P. A. Whitelock
doaj   +1 more source

HST observations of the cometary blue compact dwarf galaxy UGC 4483: a relatively young galaxy? [PDF]

, 2001
We present V and I photometry of the resolved stars in the cometary blue compact dwarf galaxy UGC 4483 using Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) images. The resulting I vs.
Bertelli G., Legrand F., Noeske K. G., Pilyugin L. S., Roy J.-R., Tantalo R., Tikhonov N. A., Trinh X. Thuan, Yuri I. Izotov   +8 more
core   +2 more sources

EVOLUTION OF THERMALLY PULSING ASYMPTOTIC GIANT BRANCH STARS. IV. CONSTRAINING MASS LOSS AND LIFETIMES OF LOW MASS, LOW METALLICITY AGB STARS [PDF]

, 2014
The evolution and lifetimes of thermally pulsating asymptotic giant branch (TP-AGB) stars suffer from significant uncertainties. In this work, we analyze the numbers and luminosity functions of TP-AGB stars in six quiescent, low metallicity ([Fe/H] ≲ −0 ...
P. Rosenfield, P. Marigo, L. Girardi, J. Dalcanton, A. Bressan, M. Gullieuszik, D. Weisz, B. Williams, A. Dolphin, B. Aringer   +9 more
semanticscholar   +1 more source

Isotopic Enrichment of Planetary Systems from Asymptotic Giant Branch Stars

The Astrophysical Journal Letters, 2023
Short-lived radioisotopes, in particular ^26 Al and ^60 Fe, are thought to contribute to the internal heating of the Earth, but are significantly more abundant in the solar system compared to the interstellar medium.
Richard J. Parker, Christina Schoettler
doaj   +1 more source

Light-Element Abundance Variations at Low Metallicity: the Globular Cluster NGC 5466

, 2010
We present low-resolution (R~850) spectra for 67 asymptotic giant branch (AGB), horizontal branch and red giant branch (RGB) stars in the low-metallicity globular cluster NGC 5466, taken with the VIRUS-P integral-field spectrograph at the 2.7-m Harlan J.
Bond, Briley, Cohen, Demarque, Denissenkov, Dierckx, Dotter, Eggleton, Fusi Pecci, Graeme H. Smith, Gratton, Harbeck, Hinkle, Howard E. Bond, Joshua Adams, Lee, Lee, Martell, Matthew Shetrone, Michael H. Siegel, Piotto, Plez, Rachel Wilkerson, Ramirez, Sarah L. Martell, Siegel, Siegel, Smith   +27 more
core   +1 more source

Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited [PDF]

, 2017
Luminous Galactic OH/IR stars have been identified as massive (>4-5 M_s) AGB stars experiencing HBB and Li production. Their Rb abundances and [Rb/Zr] ratios derived from hydrostatic model atmospheres, are significantly higher than predictions from AGB ...
V. Pérez-Mesa, V. Pérez-Mesa, O. Zamora, O. Zamora, D. A. García-Hernández, D. A. García-Hernández, B. Plez, A. Manchado, A. Manchado, Amanda I Karakas, M. Lugaro   +10 more
semanticscholar   +1 more source

The Kr85 s-process Branching and the Mass of Carbon Stars

, 2001
We present new spectroscopic observations for a sample of C(N)-type red giants. These objects belong to the class of Asymptotic Giant Branch stars, experiencing thermal instabilities in the He-burning shell (thermal pulses).
Abia C., Abia C., Anders E., Blocker T., Charbonnel C., de Laverny P., de Laverny P., Denissenkov P. A., Eriksson K., Fouque P., Frost C. A., Fuhr J. R., Gratton R., Herwig F., Herwig F., Jorissen A., Kipper T., Komarovskij V. A., Langer N., Lattanzio J. C., Malaney R. A., Marengo M., Martin G. A., Mowlavi N., Noguchi K., Ohnaka K., Ohnaka K., Piskunov N. E., Schoier F. L., Smith V. V., Takeda Y., Thevenin F., Thevenin F., Trams N. R., Utsumi K., van Loon J. Th., van Loon J. Th., Weiss A., Wiese W. L.   +38 more
core   +2 more sources

Planetary nebulae: a key tool to reconstruct the evolutionary history of stars

Frontiers in Astronomy and Space Sciences
Planetary nebulae, among the most fascinating objects in the sky, have been extensively investigated in the past years, because their study provides important information on the low and intermediate mass stellar populations of the host environment ...
Paolo Ventura, Silvia Tosi, Flavia Dell’Agli, Stefano Bianchi   +3 more
doaj   +1 more source