Results 71 to 80 of about 96,030 (294)

Stellar age revealed by chemical composition

Il Colle di Galileo, 2021
High-resolution spectroscopic surveys provide an extraordinary dataset on the processes of the formation and evolution of our galaxy, in which the determination of the ages of individual stars plays a major role. We present here a method for measuring stellar ages based on the carbon/nitrogen abundance ratio in stellar atmospheres.
Laura Magrini, Giada Casali
openaire   +1 more source

ChronoFlow: A Data-driven Model for Gyrochronology

The Astrophysical Journal
Gyrochronology is a technique for constraining stellar ages using rotation periods, which change over a star’s main-sequence (MS) lifetime due to magnetic braking. This technique shows promise for MS FGKM stars, where other methods are imprecise. However,
Phil R. Van-Lane, Joshua S. Speagle, Gwendolyn M. Eadie, Stephanie T. Douglas, Phillip A. Cargile, Catherine Zucker, Yuxi (Lucy) Lu, Ruth Angus   +7 more
doaj   +1 more source

Stellar age determination using deep neural networks

Astronomy & Astrophysics
Context. Recent spectroscopic surveys provide element abundances for large samples of Milky Way stars, from which stellar parameters can be inferred.
Boin T., Casamiquela L., Haywood M., Di Matteo P., Lebreton Y., Uddin M., Reese D. R.   +6 more
doaj   +1 more source

Stellar Winds on the Main-Sequence II: the Evolution of Rotation and Winds

, 2015
Aims: We study the evolution of stellar rotation and wind properties for low-mass main-sequence stars. Our aim is to use rotational evolution models to constrain the mass loss rates in stellar winds and to predict how their properties evolve with time on
Brott, I., Güdel, M., Johnstone, C. P., Lüftinger, T.   +3 more
core   +1 more source

AME - Asteroseismology Made Easy. Estimating stellar properties by use of scaled models [PDF]

, 2014
We present a new method to obtain stellar properties for stars exhibiting solar-like oscillations in an easy, fast, and transparent way. The method, called Asteroseismology Made Easy (AME), can determine stellar masses, mean-densities, radii, and surface
Aguirre, V. Silva, Kjeldsen, H., Lundkvist, M.   +2 more
core   +1 more source

Preferences of Pediatric Patients and Their Caregivers for Chemotherapy‐Induced Nausea and Vomiting Control Endpoints: A Mixed Methods Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Purpose Although not always achieved, complete chemotherapy‐induced nausea and vomiting (CINV) control is the conventional goal of CINV prophylaxis. In this two‐center, mixed‐methods study, we sought to understand the preferences of adolescent patients and family caregivers for CINV control endpoints.
Haley Newman, Tadi Hondonga, Alison Berry, Caitlin Elgarten, Jason Freedman, Katelyn Oranges, Sara McDonough, Caroline Diorio, L. Lee Dupuis   +8 more
wiley   +1 more source

The double sub-giant branch of NGC 6656 (M22): a chemical characterization [PDF]

, 2012
We present an abundance analysis of 101 subgiant branch (SGB) stars in the globular cluster M22. Using low resolution FLAMES/GIRAFFE spectra we have determined abundances of the neutron-capture strontium and barium and the light element carbon.
A. Aparicio, A. F. Marino, A. P. Milone, Alonso, Anderson, Anderson, Arlandini, Bekki, Bekki, Bellini, Bergemann, C. Sneden, Carretta, Carretta, Carretta, Casagrande, Cassisi, Charbonnel, Clampin, Cohen, Collet, Collet, Cristallo, Da Costa, Da Costa, de Mink, Decressin, Dickens, D’Antona, D’Antona, D’Antona, D’Ercole, Ferraro, Freeman, G. Piotto, G. Wallerstein, Gallagher, Gratton, Gratton, Gray, Harris, Hill, I. U. Roederer, Johnson, K. Lind, Kappeler, Kraft, Kurucz, Lee, Lodders, M. Asplund, M. Bergemann, M. Hilker, M. Zoccali, Mandushev, Marcolini, Marino, Marino, Marino, Marino, Marino, Mashonkina, Milone, Milone, Milone, Momany, Norris, P. B. Stetson, Pasquini, Pasquini, Peterson, Piotto, R. L. Bedin, R. P. Kraft, Ramírez, Richter, Roederer, S. Cassisi, Sbordone, Short, Simmerer, Sirianni, Sneden, Sollima, Stetson, Stetson, Straniero, Suntzeff, Sweigart, The, Ventura, Ventura, Y. Momany, Yong, Yong, Yong   +95 more
core   +2 more sources

Finding Ages for Old Stellar Populations [PDF]

Symposium - International Astronomical Union, 1996
We are far from being able to populate a histogram of star formation versus time for an elliptical galaxy based solely on observations of its spectrum, but the path toward such a dream is becoming more clear. Still, we are denied the easiest paths, and most of what I have been thinking about in the last six months are the obstacles rather than the ...
openaire   +1 more source

Pulmonary Dysfunction Is Associated With Sleep Study Abnormalities in Children With Sickle Cell Disease: A Multicenter Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Pulmonary dysfunction and sleep abnormalities are common in children with sickle cell disease (SCD) and are associated with worse clinical outcomes. Whether spirometry abnormalities are associated with polysomnography (PSG) findings remains unclear.
Ammar Saadoon Alishlash, Anis Rabbani Nourani, A. K. M. Fazlur Rahman, Dima Ezmigna, Tarig Ali‐Dinar   +4 more
wiley   +1 more source

StarFlow: Leveraging Normalizing Flows for Stellar Age Estimation in SDSS-V DR19

The Astronomical Journal
Understanding the ages of stars is crucial for unraveling the formation history and evolution of our Galaxy. Traditional methods for estimating stellar ages from spectroscopic data often struggle with providing appropriate uncertainty estimations and are
Alexander Stone-Martinez, Jon A. Holtzman, Yuxi(Lucy) Lu, Sten Hasselquist, Julie Imig, Emily J. Griffith, Earl P. Bellinger, Andrew K. Saydjari   +7 more
doaj   +1 more source