Results 11 to 20 of about 14,581 (202)

The frequency of T Tauri companion stars [PDF]

Publications of the Astronomical Society of the Pacific, 1993
We present the results of a magnitude limited (K≤8.5 mag) multiplicity survey of T Tauri stars in two nearby star forming regions, Tauris-Auriga and Ophiuchus-Scorpius. Each of the 69 stars in the sample was observed at K(2.2 microns) with an infrared array camera on the Hale 5-m Telescope at Palomar Observatory and imaged using two-dimensional speckle
Ghez, A. M., Neugebauer, G., Matthews, K.   +2 more
openaire   +6 more sources

Evidence for Differential Rotation on a T Tauri Star [PDF]

, 2006
Five years of photometric monitoring of the T Tauri star HBC 338 in NGC 1333 has revealed that it is a periodic variable, but the period has changed significantly with time.
W. Herbst, Saurav Dhital, Alice Francis, Liwei Lin, Nyla Tresser, Eric Williams   +5 more
openalex   +5 more sources

X-ray emission from MP Muscae: an old classical T Tauri star [PDF]

, 2007
We study the properties of X-ray emitting plasma of MP Mus, an old classical T Tauri star. We aim at checking whether an accretion process produces the observed X-ray emission and at deriving the accretion parameters and the characteristics of the shock ...
C. Argiroffi, A. Maggio, G. Pérès
openalex   +4 more sources

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

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

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

Flares in T Tauri stars [PDF]

International Astronomical Union Colloquium, 1995
This review concerns rapid variability, on time-scales of a few hours or less, occurring on T Tauri stars (TTS). There are several recent reviews on observed properties of TTS (e.g. Appenzeller & Mundt 1989, Bertout 1989, Gahm 1990a, Kuhi & Cram 1989), some with more emphasis on “flare-like” activity (Feigelson et al.
openaire   +2 more sources

Search for young stars among ROSAT All-Sky Survey X-ray sources in and around the R CrA dark cloud [PDF]

, 2000
We present the ROSAT All-Sky Survey data in a 126 deg^2 area in and around the CrA star forming region. With low-resolution spectroscopy of unidentified ROSAT sources we could find 19 new pre-main sequence stars, two of which are classical T Tauri stars,
Alcala, Juan M., Comeron, Fernando, Covino, Elvira, Frink, Sabine, Guillout, Patrick, Neuhaeuser, Ralph, Sterzik, Michael, Walter, Fred M., Wolk, Scott J.   +8 more
core   +2 more sources

Flares on T Tauri stars [PDF]

Symposium - International Astronomical Union, 1990
An overview of the characteristics of short-term light variability on T Tauri stars is given. The evidence of the occurrence of flares comes from observations mainly at X-ray energies and from patrole observations in the ultraviolet spectral region.
openaire   +1 more source

Probable association of T Tauri stars with the L1014 dense core [PDF]

, 2006
Using the Wide Field Grism Spectrograph 2 (WFGS2), we have carried out slit-less spectroscopy, g'r'i' photometry, and slit spectroscopy on the L1014 dense core. We detected three Halpha emission line stars.
Ebizuka, Noboru, Hasegawa, Takashi, Itoh, Yoichi, Kinugasa, Kenzo, Morita, Atsuko, Nagashima, Chie, Sugitani, Koji, Tamura, Motohide, Uehara, Mariko, Watanabe, Makoto   +9 more
core   +2 more sources