Navegação por Assunto "Stars: AGB and post-AGB"

Resultados 1-9 de 9

    • 18 Sco : a solar twin rich in refractory and neutron-capture elements, implications for chemical tagging 

      Meléndez, Jorge; Ramírez, Iván; Karakas, Amanda I.; Yong, David; Monroe, TalaWanda Rose; Bedell, Megan; Bergemann, Maria; Asplund, Martin; Maia, Marcelo Tucci; Bean, Jacob L.; Nascimento Júnior, José Dias do; Bazot, Michael; Alves-Brito, Alan; Freitas, Fabrício Catani de; Castro, Matthieu Sébastien (2014) [Artigo de periódico]
      We study with unprecedented detail the chemical composition and stellar parameters of the solar twin 18 Sco in a strictly differential sense relative to the Sun. Our study is mainly based on high-resolution (R ∼ 110,000), ...

    • Analysis of cool DO-type white dwarfs from the Sloan Digital Sky Survey data release 10 

      Reindl, Nicole; Rauch, Thomas; Werner, Klaus; Kepler, Souza Oliveira; Gänsicke, Boris; Fusillo, Nicola Pietro Gentile (2014) [Artigo de periódico]
      We report on the identification of 22 new cool DO-type white dwarfs (WDs) detected in data release 10 (DR10) of the Sloan Digital Sky Survey (SDSS). Among them, we found one more member of the so-called hot-wind DO WDs, ...

    • Carbon stars in lmc clusters revisited 

      Marigo, Paola; Girardi, Leo Alberto; Chiosi, Cesare (1996) [Artigo de periódico]
      Examining the available data for AGB stars in the Large Magellanic Cloud (LMC) clusters, we address the question about the mass interval of low- and intermediate-mass stars which eventually evolve into carbon stars (C ...

    • New hydrogen-deficient (pre-) white dwarfs in the Sloan Digital Sky Survey Data Release 10 

      Werner, Klaus; Rauch, Thomas; Kepler, Souza Oliveira (2014) [Artigo de periódico]
      We have detected 21 new, very hot hydrogen-deficient (pre-) white dwarfs (spectral types O(He), hot DO, PG1159) in the Data Release 10 of the Sloan Digital Sky Survey. We present the results of non-local thermodynamic ...

    • Panchromatic averaged stellar populations 

      Riffel, Rogério; Bonatto, Charles Jose; Fernandes, Roberto Cid; Pastoriza, Miriani Griselda; Balbinot, Eduardo (2011) [Artigo de periódico]
      We study how the spectral fitting of galaxies, in terms of light fractions, derived in one spectral region translates into another region, by using results from evolutionary synthesis models. In particular, we examine ...

    • Probing evolutionary population synthesis models in the near infrared with early-type galaxies 

      Hahn, Luis Gabriel Dahmer; Riffel, Rogério; Rodriguez-Ardila, Alberto; Martins, Lucimara Pires; Kehrig, Carolina; Heckman, Timothy M.; Pastoriza, Miriani Griselda; Dametto, Natacha Zanon (2018) [Artigo de periódico]
      We performed a near-infrared (NIR; ∼1.0 –2.4 μm) stellar population study in a sample of early-type galaxies. The synthesis was performed using five different evolutionary population synthesis libraries of models. Our main ...

    • Probing the near-infrared stellar population of Seyfert galaxies 

      Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Bonatto, Charles Jose (2009) [Artigo de periódico]
      We employ Infrared Telescope Facility SpeX near-infrared (NIR; 0.8–2.4 μm) spectra to investigate the stellar population (SP), active galactic nuclei (AGN) featureless continuum (FC) and hot dust properties in nine Sy 1 ...

    • The stellar populations of starburst galaxies through near-infrared spectroscopy 

      Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Maraston, Claudia (2008) [Artigo de periódico]
      We study the central (inner few hundred parsecs) stellar populations of four starburst galaxies (NGC 34, 1614, 3310 and 7714) in the near-infrared (NIR), from 0.8 to 2.4 μm, by fitting combinations of stellar population ...

    • The stellar spectral features of nearby galaxies in the near infrared : tracers of thermally pulsing asymptotic giant branch stars? 

      Riffel, Rogério; Mason, Rachel E.; Martins, Lucimara Pires; Rodriguez-Ardila, Alberto; Ho, Luis C.; Riffel, Rogemar André; Lira, Paulina; Gonzalez Martin, Omaira; Dutra, Daniel Ruschel; Alonso-Herrero, Almudena; Flohic, Helene; McDermid, Richard; Ramos Almeida, Cristina; Thanjavur, Karun; Winge, Claudia (2015) [Artigo de periódico]
      We analyse the stellar absorption features in high signal-to-noise ratio (S/N) near-infrared (NIR) spectra of the nuclear region of 12 nearby galaxies, mostly spirals. The features detected in some or all of the galaxies ...