Results 81 to 90 of about 46,048 (306)

ACCRETION RATES FOR T TAURI STARS USING NEARLY SIMULTANEOUS ULTRAVIOLET AND OPTICAL SPECTRA [PDF]

, 2013
We analyze the accretion properties of 21 low-mass T Tauri stars using a data set of contemporaneous near-UV (NUV) through optical observations obtained with the Hubble Space Telescope Imaging Spectrograph and the ground-based Small and Medium Aperture ...
L. Ingleby, N. Calvet, G. Herczeg, Alexander D Blaty, F. Walter, D. Ardila, R. Alexander, S. Edwards, C. Espaillat, S. Gregory, L. Hillenbrand, Alexander Brown   +11 more
semanticscholar   +1 more source

MBM 12: young protoplanetary discs at high galactic latitude

, 2009
(abridged) We present Spitzer infrared observations to constrain disc and dust evolution in young T Tauri stars in MBM 12, a star-forming cloud at high latitude with an age of 2 Myr and a distance of 275 pc.
A. Juhász, A. Sicilia-Aguilar, Adams, Apai, Artymowicz, Bouwman, Bouwman, Brandeker, Broeg, C. Chen, Carmona, Carpenter, Chauvin, Crovisier, D. Apai, Damjanov, Dorschner, Dullemond, Flaherty, Furlan, G. Meeus, Gail, Gail, Gustafsson, Haisch, Hearty, Henning, Higdon, Hogerheijde, Houck, I. Pascucci, Itoh, J. Bouwman, Jayawardhana, Jayawardhana, Jensen, Jäger, Keller, Kemper, Kessler-Silacci, Kessler-Silacci, Kurucz, Luhman, Luhman, Luhman, Magnani, Makovitz, Malfait, Min, Min, Muench, Mutschke, Pascucci, Petr, Pound, Ratzka, Rieke, Scholz, Scott, Servoin, Sicilia-Aguilar, Sicilia-Aguilar, Sicilia-Aguilar, Sicilia-Aguilar, Swain, Th. Henning, van Boekel, W. Lawson, Werner, White, Zimmermann   +70 more
core   +1 more source

Measuring the Dust Masses of Protoplanetary Disks in Lupus with ALMA: Evidence That Disks Can Be Optically Thick at 3 mm

The Astrophysical Journal, 2022
Accurate disk mass measurements are necessary to constrain disk evolution and the timescale of planet formation, but such measurements are difficult to make and are very dependent on assumptions. Here, we look at the assumption that the disk is optically
Z. Xin, C. C. Espaillat, A. M. Rilinger, Á. Ribas, E. Macías   +4 more
doaj   +1 more source

Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars [PDF]

, 2016
A distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 μm, is often detected in protoplanetary disks (PPDs). These features are commonly attributed to polycyclic aromatic hydrocarbons (PAHs).
J. Seok, Aigen Li
semanticscholar   +1 more source

Fast transition between Classical and Weak lined T Tauri stars due to external UV dissipation

, 2007
The discovery of optical jets immersed in the strong UV radiation field of the Rosette Nebula sheds new light on, but meanwhile poses challenges to, the study of externally irradiated jets. The jet systems in the Rosette are found to have a high state of
Andrews, Bally, Bally, Bally, Dorland, Henney, J.Z. Li, Li, Li, Li, Looney, Massey, Panagia, Park, Reipurth, T.A. Rector, Whitworth, Zapatero Osorio   +17 more
core   +2 more sources

Post-T Tauri stars: a false problem [PDF]

, 1996
We consider the problem of the apparent lack of old T Tauri stars in low-mass star forming regions in the framework of the standard model of low-mass star formation.
Daniele Galli, Falgarone E., Francesco Palla, Mestel L., Umebayshi T.   +4 more
core   +2 more sources

A Comprehensive Analysis of Rovibrational CO in the Era of JWST

The Astronomical Journal
We present an analysis of CO rovibrational emission lines in the 183 infrared spectra of nearby Class II objects obtained with the NIRSPEC instrument on the Keck II telescope over the past two decades.
D. Annie Dickson-Vandervelde, Colette Salyk, Geoffrey A. Blake, Clara Ross, Adwin Boogert, Klaus Pontoppidan   +5 more
doaj   +1 more source

HOT GAS LINES IN T TAURI STARS [PDF]

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   +7 more sources

X-shooter spectroscopy of young stellar objects - V. Slow winds in T Tauri stars [PDF]

, 2014
Disks around T Tauri stars are known to lose mass, as best shown by the profiles of forbidden emission lines of low ionization species. At least two separate kinematic components have been identified, one characterised by velocity shifts of tens to ...
A. Natta, A. Natta, L. Testi, L. Testi, J. Alcalá, E. Rigliaco, E. Covino, B. Stelzer, V. D’Elia   +8 more
semanticscholar   +1 more source

Unveiling extremely veiled T Tauri stars [PDF]

, 2008
Photospheric absorption lines in classical T Tauri stars (CTTS) are weak compared to normal stars. This so-called veiling is normally identified with an excess continuous emission formed in shock-heated gas at the stellar surface below the accretion ...
Basri, Bouvier, Bouvier, Briceño, Calvet, Chelli, Code, Cram, F. M. Walter, G. F. Gahm, G. J. Herczeg, Gahm, Gameiro, Giovannelli, Grankin, H. C. Stempels, Hartigan, Hartigan, Herczeg, Hessamn, Kuhi, P. P. Petrov, Petrov, Petrov, Petrov, Pojmanski, Stahl, Stempels, Stempels, Valenti   +29 more
core   +2 more sources