Results 51 to 60 of about 206 (176)

MAGNETOSPHERIC ACCRETION IN T TAURI STARS: OBSERVATIONAL TEST

Odessa Astronomical Publications, 2017
In the classical T Tauri stars (CTTS) the magnetic field plays an important role in the interaction between the star and the accretion disk. In 1996-2000 we have carried out an extensive spectroscopic and photometric monitoring of the extremly active ...
P. P. Petrov
doaj   +1 more source

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

Gender &History, Volume 38, Issue 2, Page 541-553, July 2026.
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

Variability of Southern T Tauri Stars. II. The Spectral Variability of the Classical T Tauri Star TW Hydrae

The Astrophysical Journal, 2002
We present the analysis of 42 spectra of the Classical T Tauri star TW Hya observed with the FEROS echelle spectrograph over 2 yr. We determined the rotational and radial velocities of TW Hya, obtaining v sin i = 5 ± 2 km s-1 and vrad = 12.5 ± 0.5 km s-1.
Silvia H. P. Alencar, Celso Batalha
openaire   +1 more source

Evidence for Dust Depletion in a Misaligned Protoplanetary Disk with JWST

The Astrophysical Journal Letters
Here we report the detection of dust depletion in a misaligned inner disk around UX Tau A using JWST MIRI spectra. Mid-infrared (MIR) continuum “seesaw” variability was detected in this disk by Spitzer and attributed to variable shadows cast on the outer
C. C. Espaillat, T. Thanathibodee, Z. Zhu, I. Rabago, J. Wendeborn, N. Calvet, L. Zamudio-Ruvalcaba, M. Volz, C. Pittman, M. McClure, J. F. Babb, R. Franco-Hernández, E. Macías, M. Reynolds, P.-G. Yan   +14 more
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

Iran's Forward Defense in Sub‐Saharan Africa

Middle East Policy, Volume 33, Issue 2, Page 57-71, Summer 2026.
Abstract This article examines Iran's security and defense initiatives in sub‐Saharan Africa between 1990 and 2024 and how they reflect the extraterritorial application of the regime's forward defense doctrine. In response to the long‐term erosion of its homeland defense capabilities since the Iran‐Iraq War of the 1980s—driven by infrastructure ...
Ariel Limanya Limbu, Ronen A. Cohen
wiley   +1 more source

Classical T Tauri stars: accretion, wind, dust

Acta Astrophysica Taurica, 2021
Classical T Tauri stars (CTTS) are at the early evolutionary stage when the processes of planet formation take place in the surrounding accretion disks. Most of the observed activity in CTTS is due to magnetospheric accretion and wind flows. Observations of the accreting gas flows and appearance of the line-dependent veiling of the photospheric ...
openaire   +2 more sources

Rotational Velocities and Radii Estimates of Low-mass Pre-main-sequence Stars in NGC 2264

The Astrophysical Journal
Investigating the angular momentum evolution of pre-main-sequence (PMS) stars provides important insight into the interactions between Sun-like stars and their protoplanetary disks, and the timescales that govern disk dissipation and planet formation. We
Laurin M. Gray, Katherine L. Rhode, Catrina M. Hamilton-Drager, Tiffany Picard, Luisa M. Rebull   +4 more
doaj   +1 more source

Young Stellar Objects, Accretion Disks, and Their Variability with Rubin Observatory LSST

The Astrophysical Journal Supplement Series, 2023
Vera C. Rubin Observatory, through the Legacy Survey of Space and Time (LSST), will allow us to derive a panchromatic view of variability in young stellar objects (YSOs) across all relevant timescales.
R. Bonito, L. Venuti, S. Ustamujic, P. Yoachim, R. A. Street, L. Prisinzano, P. Hartigan, M. G. Guarcello, K. G. Stassun, T. Giannini, E. D. Feigelson, A. Caratti o Garatti, S. Orlando, W. I. Clarkson, P. McGehee, E. C. Bellm, J. E. Gizis   +16 more
doaj   +1 more source

The Canary Down the Coalmine: Dagenham, London and Labour Politics

The Political Quarterly, Volume 97, Issue 2, Page 226-233, April/June 2026.
Abstract The history of Dagenham offers unique insights into both the changing composition of the working class and the forces that have reshaped domestic politics throughout the last 100 years, particularly the politics of the British labour movement.
Jon Cruddas
wiley   +1 more source