Results 51 to 60 of about 96,030 (294)

Eclipsing binary stars as tests of stellar evolutionary models and stellar ages

Proceedings of the International Astronomical Union, 2008
AbstractEclipsing binary stars provide highly accurate measurements of the fundamental physical properties of stars. They therefore serve as stringent tests of the predictions of evolutionary models upon which most stellar age determinations are based.
Stassun, Keivan G., Hebb, Leslie, Lopez-Morales, Mercedes, Prsa, Andrej   +3 more
openaire   +2 more sources

Survival Outcomes and Complications Among Canadian Children With Retinoblastoma: A Population‐Based Report From CYP‐C

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Purpose Retinoblastoma (RB) is the most common pediatric ocular cancer, yet population‐based data on survival and risk factors remain limited. This study aimed to describe survival in a large national RB cohort and identify predictors of death and complications.
Samuel Sassine, Ofélie Trudeau‐Ferrin, Caroline Laverdière, Patrick Hamel, Rosanne Superstein, Bénédicte Koukoui, Carole Provost, Paul C. Nathan, Vijay Ramaswamy, Furqan Shaikh, Brenda Gallie, Ashwin Mallipatna, Stephanie Kletke, Helen Dimaras, Hallie Coltin   +14 more
wiley   +1 more source

Anchoring Stellar Age Indicators: A Cross Calibration of [C/N] and Gyrochronology Ages via the Age–Velocity Dispersion Relation

The Astronomical Journal
Determining stellar ages is challenging, as it depends on other stellar parameters in a nonlinear way and often relies on stellar evolution models to infer the underlying relation between these parameters and age. This complexity increases when comparing
Yuxi(Lucy) Lu, Marc H. Pinsonneault, Yuan-Sen Ting, Phil R. Van-Lane, John D. Roberts, Jamie Tayar, Alexander Stone-Martinez, Amanda L. Ash   +7 more
doaj   +1 more source

Abundance trend with condensation temperature for stars with different Galactic birth places

, 2016
During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as Tc trend). However, the real astrophysical nature of this correlation is still debated.
Adibekyan, V., Delgado-Mena, E., Faria, J. P., Figueira, P., Hakobyan, A. A., Harutyunyan, G., Hernandez, J. I. Gonzalez, Israelian, G., Minchev, I., Santos, N. C., Sousa, S. G., Suarez-Andres, L.   +11 more
core   +1 more source

An upper limit to the secular variation of the gravitational constant from white dwarf stars [PDF]

, 2011
A variation of the gravitational constant over cosmological ages modifies the main sequence lifetimes and white dwarf cooling ages. Using an state-of-the-art stellar evolutionary code we compute the effects of a secularly varying G on the main sequence ...
A. Maeder, A. Weiss, D.B. Guenther, E. García-Berro, Enrique García-Berro, I. Renedo ., J. Isern, Jordi Isern, L.G. Althaus ., L.R. Bedin ., L.R. Bedin ., L.R. Bedin ., Leandro G Althaus, N. Kanekar, P. Lorén-Aguilar, Pablo Lorén-Aguilar, S. Degl'Innocenti, Santiago Torres   +17 more
core   +3 more sources

Personalized Selumetinib Dosing in Pediatric Neurofibromatosis Type 1: Insights From a Pilot Therapeutic Drug Monitoring Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Objective To evaluate selumetinib exposure using therapeutic drug monitoring (TDM) in pediatric patients with neurofibromatosis type 1 (NF1) and plexiform neurofibromas (PN), assess interpatient pharmacokinetic variability, and explore the relationship between drug exposure, clinical response, and adverse effects.
Janka Kovács, Zoltán Köllő, Balázs Gellért Karvaly, Mahmoud Obeidat, Rita Nagy, Péter Hegyi, Brigitta Teutsch, Eszter Tuboly, Miklós Garami   +8 more
wiley   +1 more source

Stellar ages and stellar rotation

, 2016
Stellar ages will play a big role in the next generation of astronomy. Useful to exoplaneteers and galactic archaeologists alike, this relatively under-exploited stellar property is currently limited by the precision of dating techniques. The work presented in this thesis contributes incrementally to a greater understanding of rotation period decay in ...
openaire   +2 more sources

Filamentary Star Formation in NGC 1275 [PDF]

, 2014
We examine the star formation in the outer halo of NGC~1275, the central galaxy in the Perseus cluster (Abell 426), using far ultraviolet and optical images obtained with the Hubble Space Telescope.
Canning, R. E. A, Conselice, C. J., Fabian, A. C., Gallagher III, J. S., Hicks, A., Johnstone, R. M., Kotulla, R., O'Connell, R. W., Rosario, D., Ryon, J. E., Wyse, R. F. G.   +10 more
core   +2 more sources

The Stellar Ages of Elliptical Galaxies [PDF]

Astrophysics and Space Science, 1995
Integrated broad-band colors and metallic lines cannot discriminate clearly between the effects of age and Z in old stellar populations. Such data are more sensitive to Z than to age. The Hβ feature provides a way to break this degeneracy. New measurements indicate that the mean stellar ages of typical E galaxy nuclei are fairly young, ranging from 2 ...
Faber, S. M., Trager, S. C., Gonzalez, J. J., Worthey, Guy   +3 more
openaire   +3 more sources

Stellar age determination in the mass–luminosity plane

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT The ages of stars have historically relied on isochrone fitting of standardized grids of models. While these stellar models have provided key constraints on observational samples of massive stars, they inherit many systematic uncertainties, mainly in the internal mixing mechanisms applied throughout the grid, fundamentally ...
Higgins, Erin R., Vink, Jorick S.
openaire   +2 more sources