Results 31 to 40 of about 1,150 (163)

Mid-infrared Variability of Young Stellar Objects on Timescales of Days to Years

The Astrophysical Journal
Variability in the brightness of young stellar objects (YSOs) is a common phenomenon that can be caused by changes in various factors, including accretion, extinction, disk morphology, interactions between the disk and the stellar photosphere, and the ...
Sieun Lee, Jeong-Eun Lee, Carlos Contreras Peña, Doug Johnstone, Gregory Herczeg, Seonjae Lee   +5 more
doaj   +1 more source

Linking the morphology of young stellar objects to their evolutionary stages with self-organizing maps

Astronomy & Astrophysics
Context. Many studies in the past few decades have investigated the evolution of young stellar objects based on their spectral energy distribution. This distribution is heavily affected not only by the evolutionary stage, but also by the morphology of ...
Hernandez David, Dionatos Odysseas, Audard Marc, Marton Gábor, Roquette Julia, Gezer Ilknur, Madarász Máté, Polsterer Kai L.   +7 more
doaj   +1 more source

ABYSS. III. Observing Accretion Activity in Young Stars Through Empirical Veiling Measurements

The Astronomical Journal
Stellar accretion plays an important role in the early stages of stellar evolution, particularly in Classical T Tauri Stars (CTTSs). Accretion of a CTTS can be related to different physical parameters such as effective temperature ( T _eff ), age ...
Serat Saad, Marina Kounkel, Keivan G. Stassun, A. Roman-Lopes, C. Román-Zúñiga, Jinyoung Serena Kim, Jonathan C. Tan, R. López-Valdivia   +7 more
doaj   +1 more source

Bolometric temperatures of young stellar objects

The Astrophysical Journal, 1993
We propose the bolometric temperature T bol as a measure of the circumstellar obscuration and evolutionary development of a young stellar object (YSO). T bol is the temperature of a blackbody having the same mean frequency as the observed continuum spectrum.
P. C. Myers, E. F. Ladd
openaire   +1 more source

Accretion in Young Stellar/Substellar Objects

The Astrophysical Journal, 2003
We present a study of accretion in a sample of 45 young, low mass objects in a variety of star forming regions and young associations, about half of which are likely substellar. Based primarily on the presence of broad, asymmetric Halpha emission, we have identified 13 objects (~30% of our sample) which are strong candidates for ongoing accretion.
Muzerolle, James, Hillenbrand, Lynne, Calvet, Nuria, Briceno, Cesar, Hartmann, Lee   +4 more
openaire   +2 more sources

ABYSS. I. Targeting Strategy for the APOGEE and BOSS Young Star Survey in SDSS-V

The Astrophysical Journal Supplement Series, 2023
The fifth iteration of the Sloan Digital Sky Survey is set to obtain optical and near-infrared spectra of ∼5 million stars of all ages and masses throughout the Milky Way. As a part of these efforts, APOGEE and BOSS Young Star Survey (ABYSS) will observe
Marina Kounkel, Eleonora Zari, Kevin Covey, Andrew Tkachenko, Carlos Román Zúñiga, Keivan Stassun, Amelia M. Stutz, Guy Stringfellow, Alexandre Roman-Lopes, Jesús Hernández, Karla Peña Ramírez, Amelia Bayo, Jinyoung Serena Kim, Lyra Cao, Scott J. Wolk, Juna Kollmeier, Ricardo López-Valdivia, Bárbara Rojas-Ayala   +17 more
doaj   +1 more source

Investigating the Nested Structure of the Outflow from the Low Luminosity Protostar IRAS 16253-2429 Using JWST and ALMA

The Astrophysical Journal
Understanding the earliest stage of star and planet formation requires detailed observations to address the connection and interplay between the accretion, outflow, and disk evolution.
Mayank Narang, Himanshu Tyagi, Nagayoshi Ohashi, P. Manoj, S. Thomas Megeath, John J. Tobin, Ewine F. Van Dishoeck, Neal J. Evans II, Dan M. Watson, Alessio Caratti o Garatti, Jes K. Jørgensen, Robert Gutermuth, Yusuke Aso, Henrik Beuther, Leslie W. Looney, David A. Neufeld, Guillem Anglada, Mayra Osorio, Adam E. Rubinstein, Samuel Federman, Lee W. Hartmann, Pooneh Nazari, Nicole Karnath, Hendrik Linz, Thomas Stanke, Tyler L. Bourke, Yao-Lun Yang, Rolf Kuiper, Joel Green, Pamela Klaassen, Wafa Zakri, Nolan Habel, Nashanty Brunken, James Muzerolle, Katerina Slavicinska, Amelia M. Stutz, Lukasz Tychoniec, Scott Wolk, Will R. M. Rocha, William J. Fischer   +39 more
doaj   +1 more source

An Embedded Disk (eDisk) in the IceAge: Investigating the Jet and Outflow from Ced 110 IRS4

The Astronomical Journal
We present a comprehensive study of the large-scale structure, jet and outflow morphology, and kinematics of the Class 0/I protostellar binary Ced 110 IRS4, using JWST NIRCam (F150W and F410M) and MIRI MRS observations from the JWST ERC program IceAge ...
Mayank Narang, Nagayoshi Ohashi, John J. Tobin, M. K. McClure, Jes K. Jørgensen, Jinshi Sai (Insa Choi), eDisk + IceAge Team   +6 more
doaj   +1 more source

The CO Outflow Components Ejected by a Recent Accretion Event in B335

The Astrophysical Journal
Protostellar outflows often present a knotty appearance, providing evidence of sporadic accretion in stellar mass growth. To understand the direct relation between mass accretion and ejection, we analyze the contemporaneous accretion activity and ...
Chul-Hwan Kim, Jeong-Eun Lee, Carlos Contreras Peña, Doug Johnstone, Gregory J. Herczeg, John J. Tobin, Neal J. Evans II   +6 more
doaj   +1 more source

Massive Star Formation in the Tarantula Nebula

The Astrophysical Journal, 2023
In this work, we present 299 candidate young stellar objects (YSOs) in 30 Doradus discovered using Spitzer and Herschel point-source catalogs, 276 of which are new.
Omnarayani Nayak, Alex Green, Alec S. Hirschauer, Rémy Indebetouw, Margaret Meixner, Tony Wong, Mélanie Chevance, Guido De Marchi, Vianney Lebouteiller, Min-Young Lee, Leslie W. Looney, Suzanne C. Madden, Julia Roman-Duval, Yasuo Fukui, Alvaro Hacar, K. E. Jameson, Venu Kalari, Luuk Oudshoorn, Mónica Rubio, Elena Sabbi   +19 more
doaj   +1 more source