Results 21 to 30 of about 14,826 (213)

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

JWST Detects Neon Line Variability in a Protoplanetary Disk

The Astrophysical Journal Letters, 2023
We report the first detection of variability in the mid-infrared neon line emission of a protoplanetary disk by comparing a JWST Mid-InfraRed Instrument Medium Resolution Spectrometer spectrum of SZ Cha taken in 2023 with a Spitzer Infrared Spectrograph ...
C. C. Espaillat, T. Thanathibodee, C. V. Pittman, J. A. Sturm, M. K. McClure, N. Calvet, F. M. Walter, R. Franco-Hernández, J. Muzerolle Page   +8 more
doaj   +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

Time-variable Jet Ejections from RW Aur A, RY Tau, and DG Tau

The Astrophysical Journal Supplement Series, 2022
We present Gemini-NIFS, Very Large Telescope-SINFONI, and Keck-OSIRIS observations of near-IR [Fe ii ] emission that are associated with well-studied jets from three active T Tauri stars—RW Aur A, RY Tau, and DG Tau—taken from 2012 to 2021.
Michihiro Takami, Hans Moritz Günther, P. Christian Schneider, Tracy L. Beck, Jennifer L. Karr, Youichi Ohyama, Roberto Galván-Madrid, Taichi Uyama, Marc White, Konstantin Grankin, Deirdre Coffey, Chun-Fan Liu, Misato Fukagawa, Nadine Manset, Wen-Ping Chen, Tae-Soo Pyo, Hsien Shang, Thomas P. Ray, Masaaki Otsuka, Mei-Yin Chou   +19 more
doaj   +1 more source

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

The –M disk Relationship for Herbig Ae/Be Stars: A Lifetime Problem for Disks with Low Masses?

The Astronomical Journal, 2023
The accretion of material from protoplanetary disks onto their central stars is a fundamental process in the evolution of these systems and a key diagnostic in constraining the disk lifetime. We analyze the relationship between the stellar accretion rate
Sierra L. Grant, Lucas M. Stapper, Michiel R. Hogerheijde, Ewine F. van Dishoeck, Sean Brittain, Miguel Vioque   +5 more
doaj   +1 more source

Mass accretion on to T Tauri stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2006
17 pages, 10 figures, accepted for publication by ...
Gregory, S. G., Jardine, M., Simpson, I., Donati, J.-F.   +3 more
openaire   +4 more sources

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

NIKA2 observations of dust grain evolution from star-forming filament to T-Tauri disk: Preliminary results from NIKA2 observations of the Taurus B211/B213 filament [PDF]

EPJ Web of Conferences
To understand the evolution of dust properties in molecular clouds in the course of the star formation process, we constrain the changes in the dust emissivity index from star-forming filaments to prestellar and protostellar cores to T Tauri stars. Using
Nguyen-Luong Q., Adam R., Ade P., Ajeddig H., André P., Artis E., Aussel H., Beelen A., Benoît A., Berta S., Bing L., Bourrion O., Calvo M., Catalano A., De Petris M., Désert F.-X., Doyle S., Driessen E.F.C., Ejlali G., Gomez A., Goupy J., Hanser C., Katsioli S., Kéruzoré F., Kramer C., Ladjelate B., Lagache G., Leclercq S., Lestrade J.-F., Macías-Pérez J. F., Madden S.C., Maury A., Mauskopf P., Mayet F., Monfardini A., Moyer-Anin A., Muñoz-Echeverría M., Perotto L., Pisano G., Ponthieu N., Revéret V., Rigby A.J., Ritacco A., Romero C., Roussel H., Ruppin F., Schuster K., Sievers A., Tucker C., Zylka R., Bacmann A., Duong-Tuan A., Peretto N., Rigby A.   +53 more
doaj   +1 more source

LIGHT CURVE TYPES OF CLASSIC T TAURI STARS

Odessa Astronomical Publications, 2016
By using the archive photometric data’s obtained for a long time intervals we have carried out a master light curves of 28 classical T Tauri type stars. For the physical character of variability mainly 5 type light curves can be separated.
N. Z. Ismailov, H. N. Adygezalzade
doaj   +1 more source