Results 61 to 70 of about 299,299 (345)

Lithium in Giant Stars [PDF]

Symposium - International Astronomical Union, 2000
Lithium continues to be a surprising element and more than ever the study of its creation, destruction and distribution is giving us tools to understand, not only the chemical evolution of this element, but also the nature of mass loss of evolved giants and nucleosynthesis of other elements in cases of very low-metal giants.
openaire   +1 more source

Thermally Pulsing Asymptotic Giant Branch Star Models and Globular Cluster Planetary Nebulae I: The Model

, 2011
Thermally pulsing asymptotic giant branch models of globular cluster stars are calculated using a synthetic model with the goal of reproducing the chemical composition, core masses and other observational parameters of the four known globular cluster ...
Alexander, Alves, Asplund, Bedin, Bertelli, Bertelli, Bianchi, Bianchi, Bica, Buell, Calamida, Caloi, Carretta, Cool, Da Costa, Davies, Gavilan, Gillett, Gratton, Gratton, Groenewegen, Groenewegen, Hansen, Hansen, Hansen, Harrington, Harris, Howard, Iglesias, Jacoby, James F. Buell, Lee, Marigo, Marino, Milone, Minniti, Ortalani, Otsuka, Peña, Piotto, Piotto, Rauch, Rauch, Reimers, Renzini, Renzini, Renzini, Richer, Schröder, Strickler, Vassiliadis, Vassiliadis, Vesperini, Wagenhuber, Yanny, Zinn, Zoccali   +56 more
core   +1 more source

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

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

Molecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source

Spectroscopic Survey of Faint Planetary-nebula Nuclei. IV. The A35-type Central Star of Pa 27

The Astrophysical Journal
We present optical spectroscopy of the 12th-magnitude central star of the planetary nebula (PN) Patchick 27 (Pa 27), obtained during a survey of faint PN nuclei (PNNs) with the Low-Resolution Spectrograph of the Hobby–Eberly Telescope.
Howard E. Bond, Gregory R. Zeimann
doaj   +1 more source

STARDUST FROM ASYMPTOTIC GIANT BRANCH STARS

The 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., Zhukovska, S., Hoppe, P., Trieloff, M.   +3 more
openaire   +2 more sources

Mass transfer from a giant star to a main sequence companion and its contribution to long-orbital-period blue stragglers

, 2008
Binary population synthesis shows that mass transfer from a giant star to a main-sequence (MS) companion may account for some observed long-orbital period blue stragglers.
Ahumada, Ahumada, Alexander, Andronov, Beer, Bloecker, Bonai Marinovi, Bonatto, Carraro, Caughlan, Caughlan, Chen, Chen, Chen, Davies, De Macro, Eggleton, Eggleton, Eggleton, Eggleton, Eggleton, Fan, Ferraro, Friel, Han, Han, Han, Han, Han, Hjellming, Hobbs, Hurley, Hurley, Hurley, Hurley, Iben, Iglesias, Itoh, Itoh, Janes, Kippenhahn, Latham, Leonard, Mapelli, Mateo, Mazeh, McCrea, Miller, Milone, Paczynski, Podsiadlowski, Podsiadlowski, Pols, Pols, Pols, Reimers, Renzini, Sandquist, Schrder, Scott, Soberman, Stryker, Tom, Tout, VandenBerg, Webbink, Williams, Xin, Xuefei Chen, Zhanwen Han   +69 more
core   +1 more source

Overview of molecular signatures of senescence and associated resources: pros and cons

FEBS Open Bio, EarlyView.
Cells can enter a stress response state termed cellular senescence that is involved in various diseases and aging. Detecting these cells is challenging due to the lack of universal biomarkers. This review presents the current state of senescence identification, from biomarkers to molecular signatures, compares tools and approaches, and highlights ...
Orestis A. Ntintas, Sylvia Vagena, Pavlos Pantelis, Giorgos Theocharous, Russel Petty, Konstantinos Evangelou, Vassilis G. Gorgoulis   +6 more
wiley   +1 more source

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars

The Astrophysical Journal, 2023
We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of 2016 June–2017 October, using the 2.5 m Isaac Newton Telescopeat La Palama.
Tahere Parto, Shahrzad Dehghani, Atefeh Javadi, Elham Saremi, Jacco Th. van Loon, Habib G. Khosroshahi, Iain McDonald, Mohammad T. Mirtorabi, Mahdieh Navabi, Maryam Saberi   +9 more
doaj   +1 more source

Dark matter and the first stars: a new phase of stellar evolution

, 2007
A mechanism is identified whereby dark matter (DM) in protostellar halos dramatically alters the current theoretical framework for the formation of the first stars.
A. Burkert, B. Rossi, Douglas Spolyar, Katherine Freese, Paolo Gondolo   +4 more
core   +1 more source