Results 31 to 40 of about 96,030 (294)

Addressing Systematics in the Traceback Age of the β Pictoris Moving Group

The Astrophysical Journal, 2023
We characterize the impact of several sources of systematic errors on the computation of the traceback age of the β Pictoris moving group ( β PMG). We find that uncorrected gravitational redshift and convective blueshift bias absolute radial velocity ...
Dominic Couture, Jonathan Gagné, René Doyon   +2 more
doaj   +1 more source

Cluster formation versus star formation rates around six regions in the LMC [PDF]

, 2004
The stellar population and star clusters around six regions in the Large Magellanic Cloud (LMC) are studied to understand the correlation between star formation and cluster formation rates.
Subramaniam, Annapurni
core   +2 more sources

INTERMEDIATE-AGE STELLAR POPULATIONS IN CLASSICAL QUASI-STELLAR OBJECT HOST GALAXIES [PDF]

The Astrophysical Journal, 2013
Although mergers and starbursts are often invoked in the discussion of quasi-stellar object (QSO) activity in the context of galaxy evolution, several studies have questioned their importance or even their presence in QSO host galaxies. Accordingly, we are conducting a study of z {approx} 0.2 QSO host galaxies previously classified as passively ...
Gabriela Canalizo, Alan Stockton
openaire   +1 more source

The stellar populations of the bluest low surface brightness galaxies

, 2005
Using optical/near-IR broadband photometry together with Halpha emission line data, we attempt to constrain the star formation histories, ages, total stellar masses and stellar mass-to-light ratios for a sample of extremely blue low surface brightness ...
Beijersbergen, Bell, Bell, Bergvall, Bergvall, Boissier, Burstein, Calzetti, Chabrier, Clegg, Copetti, Dalcanton, de Blok, de Blok, de Jong, Dong, E. Zackrisson, Ferguson, G. Östlin, Gil de Paz, Hoffman, Izotov, Jimenez, Jimenez, Jimenez, Karick, Kilborn, Kroupa, Kroupa, Kunth, Larson, Leitherer, Lejeune, Martin, Mateo, Matthews, McGaugh, McGaugh, McGaugh, McGaugh, McGaugh, Miller, Miller, N. Bergvall, Nagamine, O'Neil, O'Neil, O'Neil, Olofsson, Padoan, Pfenniger, Pilyugin, Portinari, Rosenbaum, Rönnback, Rönnback, Schechter, Schombert, Tegmark, Thomas, van den Hoek, Vazdekis, Worthey, Zackrisson, Zavala, Östlin   +65 more
core   +1 more source

Determining Ages of APOGEE Giants with Known Distances [PDF]

, 2015
We present a sample of local red giant stars observed using the New Mexico State University 1 m telescope with the APOGEE spectrograph, for which we estimate stellar ages and the age distribution from the high-resolution spectroscopic stellar parameters ...
Bovy, Jo, Feuillet, Diane K, Girardi, Leo, Holtzman, Jon, MacDonald, Nick, Majewski, Steven R, Nidever, David L   +6 more
core   +2 more sources

The Stellar Ages and Masses of Short GRB Host Galaxies: Investigating the Progenitor Delay Time Distribution and the Role of Mass and Star Formation in the Short GRB Rate

, 2010
[Abridged] We present optical and NIR observations of 19 short GRB host galaxies, aimed at measuring their stellar masses and population ages. The goals of this study are to evaluate whether short GRBs track the stellar mass distribution of galaxies, to ...
Belczynski, Bell, Berger, Berger, Berger, Berger, Berger, Bloom, Brandt, C. N. Leibler, Conroy, E. Berger, Fong, Gehrels, Graham, Hamuy, Ilbert, Kann, Lazzati, Levesque, Levesque, Levesque, Nysewander, Ofek, Paczynski, Qin, Rowlinson, Savaglio, Schlegel, Soderberg, Stanek, Sullivan, Thöne, Virgili, Zhang, Zhang, Zheng   +36 more
core   +1 more source

The Stellar Populations of Starburst Galaxies Through near infrared spectroscopy [PDF]

, 2008
We study the central (inner few hundred parsecs) stellar populations of four starburst galaxies (NGC34, NGC1614, NGC3310 and NGC7714) in the near-infrared (NIR), from 0.8 to 2.4microns, by fitting combinations of stellar population models of various ages
Adler, Allard, Alonso-Herrero, Bica, Bica, Bonatto, Brandl, Bruzual, Calzetti, Cardelli, Cid Fernandes, Cid Fernandes, Colina, Cushing, Dalcanton, Dopita, Dors, Dottori, Elmegreen, Engelbracht, Ferland, Gonzàlez-Delgado, Gonzàlez-Delgado, Hattori, Henry, Hill, Hunt, Kehrig, Kewley, Koeppen, Lançon, Lançon, Lançon, Leitherer, Liu, Maraston, Maraston, Maraston, Mazzuca, Moorwood, Mundell, Oliva, Origlia, Origlia, Pastoriza, Pastoriza, Pastoriza, Puxley, Raimann, Raimann, Rayner, Rieke, Riffel, Riffel, Riffel Rogemar, Risaliti, Rodríguez-Ardila, Rodríguez-Ardila, Saraiva, Sargent, Sarzi, Sarzi, Schmidt, Schmitt, Schweizer, Shields, Silva, Simpson, Struck, Thean, Weedman, Westera, Zezas   +72 more
core   +3 more sources

Kinematic Age of the β-Pictoris Moving Group

The Astrophysical Journal
Accurate age estimation of nearby young moving groups (NYMGs) is important as they serve as crucial testbeds in various fields of astrophysics, including the formation and evolution of stars and planets, as well as loose stellar associations.
Jinhee Lee, Inseok Song
doaj   +1 more source

Accurate Parallaxes and Stellar Ages Determinations [PDF]

Symposium - International Astronomical Union, 1995
Uncertainties on stellar ages due to the physical description of the stellar material entering the models and to measurements of global parameters and chemical composition are estimated in the case of A/F stars.With combined efforts on atmosphere modeling (to improve global parameters), on asteroseismology (to improve the physical description of the ...
Y. Lebreton, E. Michel, M. J. Goupil, A. Baglin, J. Fernandes   +4 more
openaire   +1 more source

European Standard Clinical Practice Guideline and EXPeRT Recommendations for the Diagnosis and Management of Gastroenteropancreatic Neuroendocrine Neoplasms in Children and Adolescents

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Pediatric gastroenteropancreatic neuroendocrine neoplasms (GEP‐NENs) are extremely rare and clinically heterogeneous. Management has largely been extrapolated from adult practice. This European Standard Clinical Practice Guideline (ESCP), developed by the EXPeRT network in collaboration with adult NEN experts, provides (adult) evidence ...
Michaela Kuhlen, Calogero Virgone, Antje Redlich, Michael Abele, Ricardo Lopez‐Almaraz, Tal Ben‐Ami, Ewa Bien, Gianni Bisogno, Maja Mazic Cesen, Andrea Ferrari, Malgorzata A. Krawczyk, Yves Reguerre, Dominik T. Schneider, Ines B. Brecht, Charlotte Rigaud, Bilgehan Yalcin, Rainer Claus, Christian Vokuhl, Constantin Lapa, Jörg Fuchs, Segolene Hescot, Thomas Walter, Julien Hadoux, Daniel Orbach   +23 more
wiley   +1 more source