Results 51 to 60 of about 57,378 (307)

Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha [PDF]

, 2009
We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G and K-type T Tauri stars in the Chamaeleon I star-forming cloud with ages of 3-5 Myr.
A. Collier Cameron, Ardila, B. D. Carter, Bally, Barnes, Bary, Bouvier, Bouvier, C. Dougados, Camenzind, Collier Cameron, Collier Cameron, Covino, D'Antona, Donati, Donati, Donati, Donati, Donati, Donati, Donati, Donati, Donstone, Ercolano, Favata, Feigelson, G. A. J. Hussain, G. Aulanier, Gauvin, Gregory, Guenther, H. C. Stempels, Hatzes, Herbst, Herczeg, Hussain, Igea, J. Bouvier, J. Ferreira, J. Ramirez Velez, J.-F. Donati, Jardine, Johns-Krull, Kupka, Kurucz, Kurucz, Königl, Luhman, M. M. Jardine, M. Semel, Marconi, Mathys, Morin, N. Dunstone, Natta, Natta, Palla, Rebull, Reiners, Reipurth, Robrade, Schegerer, Semel, Shevchenko, Shu, Siess, Skelly, Stempels, T. Harries, Unruh, Unruh, Valenti, W. A. Lawson, Wade, Wichmann   +74 more
core   +5 more sources

A break in the gas and dust surface density of the disc around the T Tauri star IM Lupi [PDF]

, 2009
Aims. We study the distribution and physical properties of molecular gas in the disc around the T Tauri star IM Lup on scales close to 200 AU. We investigate how well the gas and dust distributions compare and work towards a unified disc model that can ...
O. Panić, M. R. Hogerheijde, D. Wilner, C. Qi   +3 more
openalex   +3 more sources

V1094 Scorpii: A rare giant multi-ringed disk around a T Tauri star [PDF]

Astronomy & Astrophysics, 2018
Context. A wide variety of ring-like dust structures have been detected in protoplanetary disks, but their origin and frequency are still unclear. Aims. We aim to characterize the structure of an extended, multi-ringed disk discovered serendipitously in ...
S. V. Terwisga, E. V. Dishoeck, M. Ansdell, N. Marel, L. Testi, Jonathan P. Williams, S. Facchini, M. Tazzari, M. Hogerheijde, L. Trapman, C. Manara, A. Miotello, L. Maud, D. Harsono   +13 more
semanticscholar   +1 more source

Sodium ionization in T-tauri stars [PDF]

International Astronomical Union Colloquium, 1989
We present the results of a study of the sodium ionization and excitation in the winds of low-luminosity, pre-main-sequence stars. Line profiles for the Nal doublet at 5990,5986 Åare discussed and compared with the observations for those T Tauri stars with P-Cygni profiles.
A. Natta, C. Giovanardi
openaire   +1 more source

A Third Star in the T Tauri System [PDF]

, 2000
New speckle-holographic images of the T Tauri Infrared Companion (T Tauri IRC; T Tauri S) reveal it to be a double system with a sky-projected separation of 0".05, corresponding to a linear distance of 7 AU.
Bertout C., Chris D. Koresko, van Langevelde H. J.   +2 more
core   +3 more sources

Magnetospheric accretion and spin‐down of the prototypical classical T Tauri star AA Tau [PDF]

, 2010
From observations collected with the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii Telescope (CFHT) and with the NARVAL spectropolarimeter at the Telescope Bernard Lyot (TBL), we report the detection of Zeeman signatures on the prototypical ...
J. Donati, M. Skelly, J. Bouvier, S. G. Gregory, K. Grankin, M. Jardine, G. Hussain, F. Ménard, C. Dougados, Yvonne C. Unruh, S. Mohanty, M. Aurière, Julien Morin, R. Fares   +13 more
semanticscholar   +1 more source

Unveiling extremely veiled T Tauri stars [PDF]

Astronomy & Astrophysics, 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 streams.
Gahm, G. F., Walter, F. M., Stempels, H. C., Petrov, P. P., Herczeg, G. J.   +4 more
openaire   +3 more sources

Observational Constraints on the Formation and Evolution of Binary Stars [PDF]

, 2001
We present a high spatial resolution UV to NIR survey of 44 young binary stars in Taurus with separations of 10-1000 AU. The primary results include: (1) The relative ages of binary star components are more similar than the relative ages of randomly ...
A. M. Ghez, Baraffe I., Bastien P., Bate M. R., Bertout C., Boss A. P., Bouvier J., Brandner W., Duchene G., Duchene G., Duquennoy A., Dutrey A., Dutrey A., Duvert G., Gahm G. F., Guilloteau S., Haas M., Hall S. M., Herbig G. H., Hessman F. V., Kohler R., Labeyrie A., Leinert Ch., Leinert Ch., Magazzu A., Martin E. L., Moneti A., Monin J.-L., Monin J.-L., Preibisch T., R. J. White, Reipurth B., Rice J. B., Richichi A., Sartoretti P., Schwartz R. D., Wichmann R., Woitas J.   +37 more
core   +3 more sources

Spectropolarimetry of the Classical T Tauri Star T Tauri [PDF]

The Astronomical Journal, 2006
High-resolution (R ≈ 60,000) circular spectropolarimetry of the classical T Tauri star T Tau is presented. The star was observed on 1997 November 21 and 22. Analyzing 12 photospheric absorption lines, the mean longitudinal magnetic field is found to be Bz = 12 ± 35 G. The 3 σ upper limit of |Bz| ≤ 105 G.
Antoun G. Daou, Christopher M. Johns-Krull, Jeff A. Valenti   +2 more
openaire   +1 more source

Imaging the Haro 6-10 Infrared Companion [PDF]

, 1999
We present an infrared imaging study of the low-mass pre-main-sequence binary system Haro 6-10. This system is one of a handful in which the optically visible primary has the characteristics of a normal T Tauri star, while the secondary is a so-called ...
Blake, Geoffrey A., Brown, Michael E., Koerner, David W., Koresko, Chris D., Sargent, Anneila I.   +4 more
core   +5 more sources