Results 11 to 20 of about 14,388,284 (282)
Proceedings of the International Astronomical Union, 2010 AbstractIn this contribution, I briefly review our empirical knowledge of disks around ≲2M⊙ pre-main sequence (T Tauri) stars, focusing first on the dichotomic question of their frequency before moving on to some more detailed disk properties (overall orientation, total mass, outer radius).
Gaspard Duchêne
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Pre-main-sequence isochrones - II. Revising star and planet formation time-scales [PDF]
, 2013 We have derived ages for 13 young (
SP Littlefair (7736309) +4 more
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Pre-main-sequence isochrones - III. The cluster collaboration isochrone server [PDF]
, 2014 We present an isochrone server for semi-empirical pre-main-sequence model isochrones in the following systems: Johnson-Cousins, Sloan Digital Sky Survey, Two-Micron All-Sky Survey, Isaac Newton Telescope (INT) Wide-Field Camera and INT Photometric Ha ...
EE Mamajek (21849860) +6 more
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A planet within the debris disk around the pre-main-sequence star AU Microscopii. [PDF]
Nature, 2020 AU Microscopii (AU Mic) is the second closest (d = 9.79 parsec) pre-main sequence (22 Myr) star. AU Mic possesses a relatively rare and spatially resolved edge-on debris disk extending from ~35–210 astronomical units from the star, and with clumps ...
Plavchan P +86 more
europepmc +2 more sources
Are pre-main-sequence stars older than we thought? [PDF]
, 2009 We fit the colour–magnitude diagrams of stars between the zero-age main-sequence and terminal-age main sequence in young clusters and associations. The ages we derive are a factor of 1.5–2 longer than the commonly used ages for these regions, which are ...
Tim Naylor (21824576)
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Pre-main-sequence variability across the radiative-convective gap [PDF]
, 2009 We use I-band imaging to perform a variability survey of the 13-Myr-old cluster h Per. We find a significant fraction of the cluster members to be variable. Most importantly, we find that variable members lie almost entirely on the convective side of the
Nathan J. Mayne (21287030) +3 more
core +6 more sources
PRE-MAIN SEQUENCE EVOLUTIONS OF SOLAR ABUNDANCE LOW MASS STARS [PDF]
Journal of Astronomy and Space Sciences, 2007 We present the Pre-Main Sequence (PMS) evolutionary tracks of stars with 0.065~5.0M_⨀. The models were evolved from the PMS stellar birthline to the onset of hydrogen burning in the core.
Youn Kil Jung, Y. -C. Kim
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International Astronomical Union Colloquium, 1993 AbstractThe Pre-Main-Sequence (pre-MS) is defined as the phase following the protostellar stage and ending with the ignition of hydrogen in the stellar core. Models in hydrostatic and thermal equilibrium such as typical “Hayashi track” models are basically adequate to describe the internal structure of pre-MS stars, although for a fraction of pre-MS ...
openaire +1 more source
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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An HST Study of the Substellar Population of NGC 2024
The Astrophysical Journal, 2023 We performed an HST/WFC3-IR imaging survey of the young stellar cluster NGC 2024 in three filters probing the 1.4 μ m H _2 O absorption feature, characteristic of the population of low-mass and substellar-mass objects down to a few Jupiter masses.
Massimo Robberto +8 more
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