Results 21 to 30 of about 226,792 (352)
X-Ray Superflares from Pre-main-sequence Stars: Flare Energetics and Frequency [PDF]
Astrophysical Journal, 2021 Solar-type stars exhibit their highest levels of magnetic activity during their early convective pre-main-sequence (PMS) phase of evolution. The most powerful PMS flares, superflares and megaflares, have peak X-ray luminosities of log(LX)=30.5–34.0 erg s−
K. Getman, E. Feigelson
semanticscholar +1 more source
Hipparcos observations of pre-main-sequence stars
Monthly Notices of the Royal Astronomical Society, 1998 We present first results of Hipparcos observations of nearby low-mass pre-main-sequence (PMS) stars (T Tauri and Herbig Ae/Be stars). The data obtained by Hipparcos allow us to derive weighted mean parallaxes for three major nearby star-forming regions (SFRs), Lupus, Chamaeleon I and Taurus–Auriga.
I. Jankovics +4 more
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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
The Pre–Main-Sequence Stars and Initial Mass Function of NGC 2264 [PDF]
, 2000 Byeong-Gon Park +3 more
openalex +2 more sources
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
The Pre-main Sequence: Challenges and Prospects for Asteroseismology
Frontiers in Astronomy and Space Sciences, 2022 Stars do not simply pop up on the main sequence. Before the stars arrive on the zero-age main sequence, they form in the collapses of molecular clouds, gain matter through accretion processes, and compress their cores until hydrogen can burn in full ...
Konstanze Zwintz, Thomas Steindl
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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
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The Chandra Cygnus OB2 Legacy Survey: Design and X-Ray Point-source Catalog
The Astrophysical Journal Supplement Series, 2023 The Cygnus OB2 association is the largest concentration of young and massive stars within 2 kpc of the Sun, including an estimated ∼65 O-type stars and hundreds of OB stars.
Nicholas J. Wright +7 more
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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
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