Separating Photospheric and Starspot Magnetic Fields in Pre-main-sequence Stars Using IGRINS Spectroscopy [PDF]
The Astrophysical Journal LettersMagnetic fields in pre-main-sequence (PMS) stars regulate angular momentum evolution, drive magnetic activity, and modify stellar structure, yet their surface distributions remain poorly constrained.
Facundo Pérez Paolino +2 more
doaj +2 more sources
Evolution of X-Ray Activity in <25 Myr Old Pre-main Sequence Stars [PDF]
Astrophysical Journal, 2022 Measuring the evolution of X-ray emission from pre-main-sequence (PMS) stars gives insight into two issues: the response of magnetic dynamo processes to changes in the interior structure, and the effects of high-energy radiation on protoplanetary disks ...
K. Getman +6 more
semanticscholar +1 more source
X-Ray Superflares from Pre-main-sequence Stars: Flare Modeling [PDF]
Astrophysical Journal, 2021 Getman et al. report the discovery, energetics, frequencies, and effects on environs of >1000 X-ray superflares with X-ray energies E X ∼ 1034–1038 erg from pre-main-sequence (PMS) stars identified in the Chandra MYStIX and SFiNCs surveys.
K. Getman, E. Feigelson, G. Garmire
semanticscholar +1 more source
Projected Rotational Velocities and Fundamental Properties of Low-mass Pre-main-sequence Stars in the Taurus–Auriga Star-forming Region [PDF]
Astrophysical Journal, 2021 The projected stellar rotational velocity ( ) is critical for our understanding of processes related to the evolution of angular momentum in pre-main-sequence stars.
Larissa Nofi +13 more
semanticscholar +1 more source
Characterizing the X-Ray Emission of Intermediate-mass Pre-main-sequence Stars [PDF]
Astronomical Journal, 2021 We use X-ray and infrared observations to study the properties of three classes of young stars in the Carina Nebula: intermediate-mass (2–5 M ⊙) pre-main-sequence stars (IMPS; i.e., intermediate-mass T Tauri stars), late-B and A stars on the zero-age ...
Evan H. Nuñez +4 more
semanticscholar +1 more source
The IGRINS YSO Survey. I. Stellar Parameters of Pre-main-sequence Stars in Taurus-Auriga [PDF]
Astrophysical Journal, 2021 We present fundamental parameters for 110 canonical K- and M-type (1.3−0.13 M ⊙) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination of effective temperature (T eff), surface gravity (log g), magnetic-field ...
R. L'opez-Valdivia +21 more
semanticscholar +1 more source
Identification of emission-line stars in transition phase from pre-main sequence to main sequence [PDF]
Monthly notices of the Royal Astronomical Society, 2021 Pre-main-sequence (PMS) stars evolve into main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in existing literature that examine and attempt to better understand the stars in PMS to MS transition phase.
Sumana Bhattacharyya +5 more
semanticscholar +1 more source
Untangling the Galaxy. III. Photometric Search for Pre-main-sequence Stars with Deep Learning [PDF]
Astronomical Journal, 2020 A reliable census of pre-main-sequence stars with known ages is critical to our understanding of early stellar evolution, but historically there has been difficulty in separating such stars from the field.
Aidan McBride +4 more
semanticscholar +1 more source
Simulating the Sensitivity to Stellar Point Sources of Chandra X-Ray Observations
The Astrophysical Journal Supplement Series, 2023 The Chandra Cygnus OB2 Legacy Survey is a wide and deep X-ray survey of the nearby and massive Cygnus OB2 association. The survey has detected ∼8000 X-ray sources, the majority of which are pre-main-sequence X-ray-emitting young stars in the association ...
Nicholas J. Wright +4 more
doaj +1 more source
The Astrophysical Journal Supplement Series, 2023 In our Galaxy, star formation occurs in a variety of environments, with a large fraction of stars formed in clusters hosting massive stars. OB stars have an important feedback on the evolution of protoplanetary disks orbiting around nearby young stars ...
M. G. Guarcello +12 more
doaj +1 more source