Results 11 to 20 of about 39,103 (252)
New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit [PDF]
Astronomy and Astrophysics, 2015 We present new models for low-mass stars down to the hydrogen-burning limit that consistently couple atmosphere and interior structures, thereby superseding the widely used BCAH98 models.
Isabelle Baraffe +2 more
exaly +2 more sources
The ages of pre-main-sequence stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 The position of pre-main-sequence or protostars in the Hertzsprung--Russell diagram is often used to determine their mass and age by comparison with pre-main-sequence evolution tracks. On the assumption that the stellar models are accurate, we demonstrate that, if the metallicity is known, the mass obtained is a good estimate.
Christopher Tout, Ian A Bonnell
exaly +3 more sources
Massive pre-main-sequence stars in M17 [PDF]
Proceedings of the International Astronomical Union, 2017 The formation process of massive stars is still poorly understood. Massive young stellar objects (mYSOs) are deeply embedded in their parental clouds; these objects are rare, and thus typically distant, and their reddened spectra usually preclude the ...
M. Ram'irez-Tannus +8 more
semanticscholar +8 more sources
THE HABITABLE ZONES OF PRE-MAIN-SEQUENCE STARS [PDF]
The Astrophysical Journal, 2014 We calculate the pre-main-sequence habitable zone (HZ) for stars of spectral classes F–M. The spatial distribution of liquid water and its change during the pre-main-sequence phase of protoplanetary systems is important for understanding how planets ...
R. Ramirez, L. Kaltenegger
semanticscholar +4 more sources
IRAC Observations of Taurus Pre-Main-Sequence Stars [PDF]
The Astrophysical Journal, 2005 We present infrared photometry obtained with the IRAC camera on the Spitzer Space Telescope of a sample of 82 pre-main-sequence stars and brown dwarfs in the Taurus star-forming region. We find a clear separation in some IRAC color-color diagrams between
L. Hartmann +7 more
semanticscholar +4 more sources
Timescale of mass accretion in pre-main-sequence stars [PDF]
Astronomy and Astrophysics, 2009 We present the initial result of a large spectroscopic survey aimed at measuring the timescale of mass accretion in young, pre-main-sequence stars in the spectral type range K0-M5.
D. Fedele +4 more
semanticscholar +4 more sources
Accretion onto Pre-Main-Sequence Stars
Annual Review of Astronomy and Astrophysics, 2016 Núria Calvet +2 more
exaly +2 more sources
Magnetic Activity–Rotation–Age–Mass Relations in Late-pre-main-sequence Stars [PDF]
Astrophysical Journal, 2023 We study the four-dimensional relationships between magnetic activity, rotation, mass, and age for solar-type stars in the age range 5–25 Myr. This is the late-pre-main-sequence (l-PMS) evolutionary phase when rapid changes in a star's interior may lead ...
K. Getman, E. Feigelson, G. Garmire
semanticscholar +1 more source
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
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