Results 31 to 40 of about 7,215 (204)

Observable Signatures of Classical T Tauri Stars Accreting in an Unstable Regime

EPJ Web of Conferences, 2014
We discuss key observational signatures of Classical T Tauri stars (CTTSs) accreting through Rayleigh-Taylor instability, which occurs at the interface between an accretion disk and a stellar magnetosphere.
Kurosawa Ryuichi, Romanova M. M.
doaj   +1 more source

Clustering Properties of Intermediate and High-mass Young Stellar Objects

The Astronomical Journal, 2023
We have selected 337 intermediate- and high-mass young stellar objects (YSOs; 1.5–20 M _⊙ ) well-characterized with spectroscopy. By means of the clustering algorithm HDBSCAN, we study their clustering and association properties in the Gaia DR3 catalog ...
Miguel Vioque, Manuel Cavieres, Michelangelo Pantaleoni González, Álvaro Ribas, René D. Oudmaijer, Ignacio Mendigutía, Lena Kilian, Héctor Cánovas, Michael A. Kuhn   +8 more
doaj   +1 more source

XMM-Newton observations of the sigma Ori cluster. II. Spatial and spectral analysis of the full EPIC field

, 2005
We present the results of an XMM-Newton observation of the young (~2-4 Myr) cluster around the hot star sigma Orionis. In a previous paper we presented the analysis of the RGS spectrum of the central hot star; here we discuss the results of the analysis ...
Argiroffi, Argiroffi, Baraffe, Barrado y Navascués, Barrado y Navascués, Barrado y Navascués, Berghöfer, Brown, Burningham, Béjar, Béjar, Béjar, Caballero, Damiani, E. Franciosini, Favata, Feigelson, Feigelson, Flaccomio, Flaccomio, Flaccomio, Flaccomio, Gagné, Garmire, Garmire, Getman, Hasinger, Hesser, Imanishi, Imanishi, J. Sanz-Forcada, Kastner, Kastner, Kenyon, Kenyon, Lavalley, Lee, Leggett, Martín, Mokler, Muzerolle, Neuhäuser, Oliveira, Oliveira, Oliveira, Ozawa, Pallavicini, Preibisch, Preibisch, Preibisch, R. Pallavicini, Ramírez, Randich, Sanz-Forcada, Scelsi, Schmitt, Scholz, Sherry, Siess, Skinner, Stassun, Stelzer, Stelzer, Stelzer, Stelzer, Tozzi, Walter, Weaver, Zapatero Osorio, Zapatero Osorio   +69 more
core   +1 more source

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 ...
A. Maggio, Batalha, C. Argiroffi, Calvet, Carpenter, Drake, Drake, Feigelson, G. Peres, Giridhar, Gregorio-Hetem, Gullbring, Günther, Herczeg, Kashyap, Kastner, Makarov, Mamajek, Ness, Preibisch, Robrade, Sartori, Savage, Schmitt, Siess, Silverstone, Smith, Stelzer, Testa, Zuckerman   +29 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

The IC2118 association: new T Tauri stars in high-latitude molecular clouds

, 2004
We identified new pre-main sequence stars in the region of high-latitude molecular clouds associated with the reflection nebula IC2118, around l = 208 degr and b = -27 degr. The stars were selected as T Tauri candidates in objective prism plates obtained
Alcalà, Alcalà, Alcalà, Aoyama, Bally, Baraffe, Bodenheimer, Brown, Brown, Cohen, Comerón, Gyulbudaghian, Hartigan, Hartmann, Kenyon, Kirkpatrick, Kun, Kun, Kun, L. E. B. Johansson, Luhman, M. Kun, Magnani, Martín, Martín, Meyer, Mizuno, N. A. Walton, Nakano, Ogura, Onishi, Palla, Penprase, Persi, Pickles, Preibisch, Rieke, S. Nikolić, Stanke, T. Prusti, White, Yonekura   +41 more
core   +1 more source

Modeling the Halpha line emission around classical T Tauri stars using magnetospheric accretion and disk wind models [PDF]

, 2010
Spectral observations of classical T Tauri stars show a wide range of line profiles, many of which reveal signs of matter inflow and outflow. Halpha is the most commonly observed line profile due to its intensity, and it is highly dependent on the ...
Alencar, Alencar, Anderson, Appenzeller, Bacciotti, Blandford, Bouvier, Burrows, Cabrit, Cai, Calvet, Casse, Edwards, Ferreira, Finkenzeller, G. H. R. A. Lima, Ghosh, Gullbring, Gullbring, Hartigan, Hartmann, Hartmann, J. Muzerolle, Johns-Krull, Johns-Krull, Koenigl, Kurosawa, L. Hartmann, Martin, Mestel, Murphy, Muzerolle, Muzerolle, Muzerolle, Muzerolle, Muzerolle, N. Calvet, Pelletier, Pesenti, Pudritz, Pudritz, Reipurth, Romanova, Rybicki, S. H. P. Alencar, Safier, Shu, Symington, Takami, Vernazza, Zanni   +50 more
core   +1 more source

Haunting the Historiography of Slaves in South Asia from the nineteenth century to the present

Gender &History, EarlyView.
ABSTRACT Using both English and Urdu‐language records, this article traces the career of a few African and Afro‐Asian women slaves in the household‐state of Awadh during the first half of the nineteenth century. Focusing on the same records, this article compares a master‐poet's recognition of the motherhood of the African and Afro‐Asian slaves to the ...
Indrani Chatterjee
wiley   +1 more source

A Predicted Great Dimming of T Tauri: Has it Begun?

The Astronomical Journal
The optical star in the T Tauri triple system is the prototype of young Sun-like stars in our galaxy. This complex and dynamic system has evidence for misaligned disks and outflows, and molecular material in a circumbinary ring that obscures the southern
Tracy L. Beck
doaj   +1 more source

The Ca ii Lines as Tracers of Disk Structure in T Tauri Stars: The Chamaeleon I Region

The Astrophysical Journal, 2023
We present a study of the Ca ii K and IR triplet lines in a sample of classical T Tauri stars in the Chamaeleon I star-forming region. We study X-shooter spectra of the stars in the sample and find that in some of these stars the Ca ii lines are much ...
Marbely Micolta, Nuria Calvet, Thanawuth Thanathibodee, Gladis Magris C., María José Colmenares, Jesús V. Díaz, Jairo Alzate-Trujillo   +6 more
doaj   +1 more source