Results 101 to 110 of about 10,538,954 (217)

A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. III. Optical Spectra

The Astrophysical Journal
Classical T Tauri Stars (CTTSs) are highly variable stars that possess gas- and dust-rich disks from which planets form. Much of their variability is driven by mass accretion from the surrounding disk, a process that is still not entirely understood.
John Wendeborn, Catherine C. Espaillat, Thanawuth Thanathibodee, Connor E. Robinson, Caeley V. Pittman, Nuria Calvet, James Muzerolle, Fredrick M. Walter, Jochen Eislöffel, Eleonora Fiorellino, Carlo F. Manara, Ágnes Kóspál, Péter Ábrahám, Rik Claes, Elisabetta Rigliaco, Laura Venuti, Justyn Campbell-White, Pauline McGinnis, Manuele Gangi, Karina Mauco, Filipe Gameiro, Antonio Frasca, Zhen Guo   +22 more
doaj   +1 more source

An improved genome of the model marine alga Ostreococcus tauri unfolds by assessing Illumina de novo assemblies [PDF]

, 2014
Background: Cost effective next generation sequencing technologies now enable the production of genomic datasets for many novel planktonic eukaryotes, representing an understudied reservoir of genetic diversity. O.
Moreau, Hervé, Van De Peer, Yves, Adam Eyre-Walker, Château, Annie, Van de Peer, Y., Stephane Rombauts, Carré, Isabelle, Eyre-Walker, Adam, Rivals, E., Peer, Yves van de, Wendy Schackwitz, Schackwitz, Wendy, Benoit Piégu, Moreau, H., Schackwitz, W., Grimsley, Nigel, Evelyne Derelle, Rombauts, Stephane, Eyre Walker, Adam, Blanc-Mathieu, R., Eyre-Walker, A., Verhelst, B., Blanc-Mathieu, Romain, Bouget, François-Yves, Hervé Moreau, Nigel Grimsley, Rivals, Eric, Piégu, Benoit, Isabelle Carré, François-Yves Bouget, Derelle, Evelyne, Eric Rivals, Carré, I., Gwenaël Piganeau, Derelle, E., Bram Verhelst, Verhelst, Bram, Annie Château, Romain Blanc-Mathieu, Bouget, F.-Y., Château, A., Carré, Isabelle A., Piégu, B., Grimsley, N., Piganeau, G., Rombauts, S., Piganeau, Gwenaël, Blanc Mathieu, Romain, Yves Van de Peer   +48 more
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HOT GAS LINES IN T TAURI STARS

The Astrophysical Journal Supplement Series, 2013
ABSTRACT For Classical T Tauri Stars (CTTSs), the resonance doublets of N v, Si iv, and C iv, as well as the He ii 1640 Å line, trace hot gas flows and act as diagnostics of the accretion process. In this paper we assemble a large high-resolution, high-sensitivity data set of these lines in CTTSs and Weak T Tauri Stars (WTTSs).
Ardila, David, Herczeg, Gregory, Gregory, Scott, Ingleby, Laura, France, Kevin, Brown, Alexander, Edwards, Suzan, Johns-Krull, Christopher, Linsky, Jeffrey, Yang, Hao, Valenti, Jeff, Abgrall, Hervé, Alexander, Richard, Bergin, Edwin, Bethell, Thomas, Brown, Joanna, Calvet, Nuria, Espaillat, Catherine, Hillenbrand, Lynne, Hussain, Gaitee, Roueff, Evelyne, Schindhelm, Eric, Walter, Frederick   +22 more
openaire   +5 more sources

Accretion and outflow-related X-rays in T Tauri stars

, 2007
We report on accretion- and outflow-related X-rays from T Tauri stars, based on results from the X-rays potentially form in shocks of accretion streams near the stellar surface, although we hypothesize that direct interactions between the streams and ...
Thomas Preibisch, Rebull, Luisa, Palla, Francesco, Scelsi, Luigi, Padgett, Deborah, Giusi Micela, Franciosini, Elena, Sylvain Guieu, Luigi Scelsi, Deborah Padgett, Montmerle, Thierry, Menard, Francois, Stelzer, Beate, Marc Audard, Bruno Silva, Beate Stelzer, François Ménard, Eric Feigelson, Dougados, Catherine, Guieu, Sylvain, Jérôme Bouvier, Audard, Marc, Glauser, Adrian, Pillitteri, Ignazio, Gudel, Manuel, Monin, Jean-Louis, Feigelson, Eric, Manuel Güdel, Telleschi, Alessandra, Kevin Briggs, Micela, Giusi, Preibisch, Thomas, Elena Franciosini, Catherine Dougados, Stephen Skinner, Silva, Bruno, Briggs, Kevin, Skinner, Stephen, Ignazio Pillitteri, Arzner, Kaspar, Francesco Palla, Bouvier, Jerome, Grosso, Nicolas, Jean-Louis Monin, Adrian Glauser, Thierry Montmerle, Kaspar Arzner, Alessandra Telleschi, Nicolas Grosso, Luisa Rebull   +49 more
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Magnetospheric accretion in T Tauri stars

, 2003
The magnetic field of T Tauri stars is believed to be strong enough to disrupt the inner region of their accretion disk. At the inner disk edge, matter flows along the magnetic field lines at free fall velocity and accretes at the magnetic poles onto ...
J. Bouvier
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Variations in the Magnetic Field Strength of Pre-main-sequence Stars, Solar-type Main-sequence Stars, and the Sun

The Astrophysical Journal
The surface magnetic fields of pre-main-sequence stars and zero-age main-sequence stars are notably strong, resulting in the generation of numerous spots and the emission of bright chromospheric lines.
Mai Yamashita, Yoichi Itoh, Shin Toriumi
doaj   +1 more source

Rotational Evolution of Classical T Tauri Stars: Models and Observations

The Astrophysical Journal
We developed a grid of stellar rotation models for low-mass and solar-type classical T Tauri stars (CTTS; 0.3 M _⊙ < M _* < 1.2 M _⊙ ). These models incorporate the star–disk interaction and magnetospheric ejections to investigate the evolution of the ...
Javier Serna, Giovanni Pinzón, Jesús Hernández, Ezequiel Manzo-Martínez, Karina Mauco, Carlos G. Román-Zúñiga, Nuria Calvet, Cesar Briceño, Ricardo López-Valdivia, Marina Kounkel, Guy S. Stringfellow, Keivan G. Stassun, Marc Pinsonneault, Lucia Adame, Lyra Cao, Kevin Covey, Amelia Bayo, Alexandre Roman-Lopes, Christian Nitschelm, Richard R. Lane   +19 more
doaj   +1 more source

Dynamical investigations of the multiple stars

Open Astronomy, 2017
Two multiple stars - the quadruple star - Bootis (ADS 9173) and the triple star T Taury were investigated. The visual double star - Bootiswas studied on the basis of the Pulkovo 26-inch refractor observations 1982-2013.
Kiyaeva Olga V., Zhuchkov Roman Ya.
doaj   +1 more source

Lithium and the evolution of intermediate-mass T Tauri and Herbig stars

Astronomy & Astrophysics
Context. Interior models predict that stellar envelopes change from convective to radiative during the pre-main-sequence (pre-MS) evolution of intermediate-mass stars.
Mendigutía I., Campbell-White J., Montesinos B., Maldonado J., Fullana-García L., Mirouh G. M., Meeus G., Vioque M., Sicilia-Aguilar A., Zapatero-Osorio M. R., Villaver E., Kahar R.   +11 more
doaj   +1 more source

Disks around weak-line T Tauri stars

, 2006
THESIS 8263The formation of low -mass (M ~ 1 M⊙) stars has generally been divided into four stages before reaching the main sequence: Class 0 (cloud of gas and dust) -> Class I (embedded star with disk in envelope) -> Class II (visible star with disk ) ->
Gras-Velázquez, Àgueda
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