Results 31 to 40 of about 387 (167)
Correlating Changes in Spot Filling Factors with Stellar Rotation: The Case of LkCa 4
The Astrophysical Journal, 2023 We present a multi-epoch spectroscopic study of LkCa 4, a heavily spotted non-accreting T Tauri star. Using SpeX at NASA’s Infrared Telescope Facility (IRTF), 12 spectra were collected over five consecutive nights, spanning ≈1.5 stellar rotations.
Facundo Pérez Paolino +6 more
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The variability of T Tauri stars [PDF]
Symposium - International Astronomical Union, 1990 For many years we have monitored the variability of some bright T Tauri stars with the 0.6 m “Perkin telescope” at Van Vleck Observatory. Collaborators in this endeavor have included several astronomers at the Crimea Astrophysical Observatory, at Capidomonte Observatory, at the U.S. Naval Observatory, and even some sophisticated amateurs.
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Astronomy & Astrophysics, 2005 Using the UVES echelle spectrograph at the ESO VLT we obtained two-dimensional high-resolution (R = 50 000) spectra of the edge-on disk objects HH30*, HK Tau B, and HV Tau C. For comparison purposes we also observed with the same equipment both the classical T Tauri star HL Tau and the active late-type star LDN 1551-9. The spectra of all three observed
Appenzeller, Immo +2 more
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Some resolutions on T Tauri stars [PDF]
Symposium - International Astronomical Union, 1990 This symposium is dedicated to the results of studies of flare stars. The necessity of the detailed analysis of observational data on flare stars follows from the very simple fact, that until now the theory has not found for the answer to the question: why the young stars of low luminosity are flaring.
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A Comprehensive Analysis of Rovibrational CO in the Era of JWST
The Astronomical JournalWe 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 +5 more
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Dynamics of magnetic flux tubes in accretion disks of Herbig Ae/Be stars
Open Astronomy, 2022 The dynamics of magnetic flux tubes (MFTs) in the accretion disk of typical Herbig Ae/Be star (HAeBeS) with fossil large-scale magnetic field is modeled taking into account the buoyant and drag forces, radiative heat exchange with the surrounding gas ...
Khaibrakhmanov Sergey A. +1 more
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Publications of the Astronomical Society of Japan, 1998 Previously, it was shown by DeCampli that an isothermal wind of T Tauri stars cannot explain both the mass-loss rates and X-ray observations. Since the assumption of an isothermal wind does not hold in general, we recalculated the structure of a steady and spherically symmetric stellar wind, taking the heating luminosity and its range as input ...
Masayoshi Kiguchi +2 more
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Post–T Tauri Stars: A False Problem [PDF]
The Astrophysical Journal, 1997 6 pages (LaTeX), no Figures to be published in The Astrophysical Journal ...
Palla, F., Galli, D.
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Centimeter-sized Grains in the Compact Dust Ring around Very-low-mass Star CIDA 1
The Astronomical Journal, 2023 We examined the grain size in the dust ring encircling the 0.19 M _☉ T Tauri star CIDA 1 using the Karl G. Jansky Very Large Array at multiple centimeter wavelengths, with a spatial resolution of 0.″2–0.″9. We detected distinct partial-ring structures at
Jun Hashimoto +5 more
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Rotation effects in classical T Tauri stars [PDF]
Astronomy Letters, 2012 12 pages, 4 ...
Artemenko, Svetlana A. +2 more
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