Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Jeffries, Robin. D."'
We present an Artificial Neural Network (ANN) model of photospheric lithium depletion in cool stars (3000 < Teff / K < 6500), producing estimates and probability distributions of age from Li I 6708A equivalent width (LiEW) and effective temperature d
Externí odkaz:
http://arxiv.org/abs/2409.07523
OB associations are important probes of recent star formation and Galactic structure. In this study, we focus on the Auriga constellation, an important region of star formation due to its numerous young stars, star-forming regions and open clusters.
Externí odkaz:
http://arxiv.org/abs/2304.08370
OB associations are low-density groups of young stars that are dispersing from their birth environment into the Galactic field. They are important for understanding the star formation process, early stellar evolution, the properties and distribution
Externí odkaz:
http://arxiv.org/abs/2203.10007
Using the kinematically unbiased technique described in Binks, Jeffries & Maxted (2015), we present optical spectra for a further 122 rapidly-rotating (rotation periods < 6 days), X-ray active FGK stars, selected from the SuperWASP survey. We identif
Externí odkaz:
http://arxiv.org/abs/1708.09541
Autor:
Binks, Alex S., Jeffries, Robin D.
We present a search for debris discs amongst M-dwarf members of nearby, young (5-150 Myr) moving groups (MGs) using infrared (IR) photometry, primarily from the Wide Infrared Survey Explorer (WISE). A catalogue of 100 MG M-dwarfs that have suitable W
Externí odkaz:
http://arxiv.org/abs/1611.07416
We investigate whether open clusters (OCs) tend to energy equipartition, by means of direct N-body simulations with a broken power-law mass function. We find that the simulated OCs become strongly mass segregated, but the local velocity dispersion do
Externí odkaz:
http://arxiv.org/abs/1604.03943
Autor:
Terndrup, Donald M., Pinsonneault, Marc, Jeffries, Robin D., Ford, Alison, Stauffer, John R., Sills, Alison
We report new measures of radial velocities and rotation rates (v sin i) for 51 F and early-G stars in the open cluster NGC2516, and combine these with previously published data. From high signal-to-noise spectra of two stars, we show that NGC2516 ha
Externí odkaz:
http://arxiv.org/abs/astro-ph/0205300
Autor:
James, David J, Jardine, Moira M, Jeffries, Robin D, Randich, Sofia, Cameron, Andrew Collier, Ferreira, Miguel
Publikováno v:
Mon.Not.Roy.Astron.Soc. 318 (2000) 1217
A rotation rate and X-ray luminosity analysis is presented for rapidly rotating single and binary M-dwarf systems. X-ray luminosities for the majority of both single & binary M-dwarf systems with periods below $\simeq 5-6$ days (equatorial velocities
Externí odkaz:
http://arxiv.org/abs/astro-ph/0007159
Publikováno v:
Monthly Notices of the Royal Astronomical Society; Jun2023, Vol. 522 Issue 2, p3124-3137, 14p
Publikováno v:
ASP Conference Series; 2023, Vol. 534, p129-151, 23p