Results 21 to 30 of about 3,760 (219)

Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds. II. Spectroscopic and Environmental Analysis of Thorne–Żytkow Object and Super-AGB Star Candidates

open access: yesThe Astrophysical Journal, 2023
In previous work, we identified a population of 38 cool and luminous variable stars in the Magellanic Clouds and examined 11 in detail in order to classify them as either Thorne–Żytkow objects (TŻOs; red supergiants with a neutron star cores) or super ...
Anna J. G. O‘Grady   +11 more
doaj   +1 more source

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

open access: yesEPJ 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

High mass-loss asymptotic giant branch stars detected by the Midcourse Space Experiment in the 'intermediate' and 'outer' Galactic bulge [PDF]

open access: yes, 2007
We present a study of Midcourse Space Experiment (MSX) point sources in the Galactic bulge (|l| < 3°, 1° < |b| < 5°), observed in the A, C, D and E bands (8–21μm), with a total area ∼48 deg2 and more than 7000 detected sources in the MSXD band ...
Ojha, D., K.   +6 more
core   +1 more source

CHEMICAL COMPOSITION OF ATMOSPHERES OF COOL GIANT STARS

open access: yesOdessa Astronomical Publications, 2017
Results of determination of abundances of chemical elements in the atmospheres of 57 giant stars of the oxygen sequence of the Galactic disk axe given.
N. S. Komarov
doaj   +1 more source

STARDUST FROM ASYMPTOTIC GIANT BRANCH STARS

open access: yesThe Astrophysical Journal, 2009
The formation of dust in the outflows of low- and intermediate-mass stars on the first giant branch and asymptotic giant branch (AGB) is studied and the relative contributions of stars of different initial masses and metallicities to the interstellar medium (ISM) at the instant of solar system formation are derived.
Gail, H.   +3 more
openaire   +2 more sources

Asymptotic giant branch stars in the Phoenix dwarf galaxy [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2008
JHKs near-infrared photometry of stars in the Phoenix dwarf galaxy is presented and discussed. Combining these data with the optical photometry of Massey et al. allows a rather clean separation of field stars from Phoenix members. The discovery of a Mira variable (P = 425 days), which is almost certainly a carbon star, leads to an estimate of the ...
Menzies, J. W   +5 more
openaire   +3 more sources

The Search for Binaries in Post-Asymptotic Giant Branch Stars: Do Binary Companions Shape the Nebulae? [PDF]

open access: yesJournal of Astronomy and Space Sciences, 2012
Binary companions are often invoked to explain the axial and point symmetry seen in the majority of planetary nebulae and proto-planetary nebulae (PPNs).
Bruce J. Hrivnak
doaj   +1 more source

THE ASTROSPHERE OF THE ASYMPTOTIC GIANT BRANCH STAR CIT 6 [PDF]

open access: yesThe Astronomical Journal, 2014
accepted for publication by the Astronomical ...
Sahai, Raghvendra, Mack-Crane, Galen P.
openaire   +2 more sources

Thermally-pulsing asymptotic giant branch stars in the Magellanic Clouds [PDF]

open access: yes, 2009
We present the latest results of a theoretical project aimed at investigating the properties of thermally-pulsing asymptotic giant branch (TP-AGB) stars in different host systems.
GRANATO GIAN LUIGI   +6 more
core   +1 more source

Planetary Engulfment Prognosis within the ρ CrB System

open access: yesThe Astrophysical Journal, 2023
Exoplanets have been detected around stars at various stages of their lives, ranging from young stars emerging from formation to the latter stages of evolution, including white dwarfs and neutron stars.
Stephen R. Kane
doaj   +1 more source

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