Results 101 to 110 of about 206 (176)

Unveiling the Dual Nature of V1180 Cas: UXor-like Dips and EXor-like Bursts across a Decade

The Astrophysical Journal
We present a detailed analysis of the long-term photometric and spectroscopic evolution of V1180 Cas over a decade, aiming to identify the dominant mechanisms behind its variability. We combine multiband light curves from 1999 to 2025 with over 30 epochs
Tarak Chand, Saurabh Sharma, Koshvendra Singh, Joe P. Ninan, Arpan Ghosh, Devendra K. Ojha, Tapas Baug, D. K. Sahu, Bhuwan C. Bhatt, Pramod Kumar, Ram K. Yadav, Neelam Panwar, Aayushi Verma, Harmeen Kaur, Mamta, Manojit Chakraborty, Kartik Gokhe, Ajay Kumar Singh   +17 more
doaj   +1 more source

The accretion process on protostars

Frontiers in Astronomy and Space Sciences
The process of mass accretion onto Young Stellar Objects (YSOs) plays a fundamental role in determining the final stellar mass and setting the initial conditions for planet formation.
Eleonora Fiorellino, Eleonora Fiorellino, Alice Somigliana   +2 more
doaj   +1 more source

A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. III. Optical Spectra

The Astrophysical Journal
Classical T Tauri Stars (CTTSs) are highly variable stars that possess gas- and dust-rich disks from which planets form. Much of their variability is driven by mass accretion from the surrounding disk, a process that is still not entirely understood.
John Wendeborn, Catherine C. Espaillat, Thanawuth Thanathibodee, Connor E. Robinson, Caeley V. Pittman, Nuria Calvet, James Muzerolle, Fredrick M. Walter, Jochen Eislöffel, Eleonora Fiorellino, Carlo F. Manara, Ágnes Kóspál, Péter Ábrahám, Rik Claes, Elisabetta Rigliaco, Laura Venuti, Justyn Campbell-White, Pauline McGinnis, Manuele Gangi, Karina Mauco, Filipe Gameiro, Antonio Frasca, Zhen Guo   +22 more
doaj   +1 more source

Magnetic reconnection in partially ionized plasmas. [PDF]

Proc Math Phys Eng Sci, 2020
Ni L, Ji H, Murphy NA, Jara-Almonte J.
europepmc   +1 more source

The Pre-outburst Properties of the FU Ori Object HBC 722

The Astrophysical Journal Letters
FU Ori outbursts are thought to play an important role in stellar assembly and the evolution of protoplanetary disks. However, the progenitor young stellar objects are largely uncharacterized.
Gregory J. Herczeg, Bo Reipurth
doaj   +1 more source

A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. I. HST Far-UV and Near-UV Spectra

The Astrophysical Journal
The classical T Tauri star (CTTS) stage is a critical phase of the star and planet formation process. In an effort to better understand the mass accretion processes, which can dictate future stellar evolution and planet formation, a multiepoch ...
John Wendeborn, Catherine C. Espaillat, Sophia Lopez, Thanawuth Thanathibodee, Connor E. Robinson, Caeley V. Pittman, Nuria Calvet, Nicole Flors, Fredrick M. Walter, Ágnes Kóspál, Konstantin N. Grankin, Ignacio Mendigutía, Hans Moritz Günther, Jochen Eislöffel, Zhen Guo, Kevin France, Eleonora Fiorellino, William J. Fischer, Péter Ábrahám, Gregory J. Herczeg   +19 more
doaj   +1 more source

LAMOST Young Stellar Objects. I. Spectroscopically Identifying and Characterizing M-type YSOs

The Astrophysical Journal
This study utilized Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) low-resolution spectra to identify M-type young stellar objects (YSOs) and characterize their accretion signatures.
Xiang-Song Fang, Jian-Rong Shi, Ming-Yi Ding, Zi-Huang Cao   +3 more
doaj   +1 more source

Revisiting the case of R Monocerotis: Is CO removed at R < 20 au?^⋆. [PDF]

Astron Astrophys, 2018
Alonso-Albi T, Riviere-Marichalar P, Fuente A, Pacheco-Vázquez S, Montesinos B, Bachiller R, Treviño-Morales SP.   +6 more
europepmc   +1 more source

The Turbulent Dynamo. [PDF]

J Fluid Mech, 2021
Tobias SM.
europepmc   +1 more source

Binarity and Accretion in AGB Stars: HST/STIS Observations of UV Flickering in Y Gem. [PDF]

Astrophys J, 2018
Sahai R, Sánchez Contreras C, Mangan A, Sanz-Forcada J, Muthumariappan C, Claussen MJ.   +5 more
europepmc   +1 more source