512 datasets found

Keywords: dwarf stars

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  • Rotational velocities for M dwarfs

    We present spectroscopic rotation velocities (vsini) for 56 M dwarf stars using high-resolution Hobby-Eberly Telescope High Resolution Spectrograph red spectroscopy. In...
  • Near-IR spectral classification of T dwarfs

    A revised near-infrared classification scheme for T dwarfs is presented, based on and superseding prior schemes developed by Burgasser and coworkers (2002ApJ...564..421B) and...
  • Debris disks around solar-type stars

    We have searched for infrared excesses around a well-defined sample of 69 FGK main-sequence field stars. These stars were selected without regard to their age, metallicity, or...
  • Spitzer 24{mu}m photometry of A dwarfs

    We report new Spitzer 24{mu}m photometry of 76 main-sequence A-type stars. We combine these results with previously reported Spitzer 24{mu}m data and 24 and 25{mu}m photometry...
  • X-Ray emission from solar-type stars: F and G

    Results of a volume-limited X-ray survey of stars of luminosity classes IV and V in the spectral range F7-G9 observed with the Einstein Observatory are presented. Using survival...
  • Dwarf K and M stars in Southern hemisphere

    In the course of the near-complete Michigan Spectral Survey of the Southern sky, 624 dwarf stars of type K2V and later have been identified. Many of these stars are previously...
  • Transits time of M-dwarf TOI-1749

    We report the discovery of one super-Earth- (TOI-1749b) and two sub-Neptune-sized planets (TOI-1749c and TOI-1749d) transiting an early M dwarf at a distance of 100pc, which...
  • Exoplanet parameters from Kepler and K2

    We present calculations of the occurrence rate of small close-in planets around low-mass dwarf stars using the known planet populations from the Kepler and K2 missions. Applying...
  • Kepler GK dwarf planet candidate samples

    We re-examine the statistical confirmation of small long-period Kepler planet candidates in light of recent improvements in our understanding of the occurrence of systematic...
  • Rotational evolution of young, binary M dwarfs

    We have analyzed K2 light curves for more than 3000 low-mass stars in the ~8 Myr old Upper Sco association, the ~125 Myr age Pleiades open cluster, and the ~700 Myr old Hyades...
  • M dwarf stars rotational broadening measurements

    Main-sequence, fully convective M dwarfs in eclipsing binaries are observed to be larger than stellar evolutionary models predict by as much as 10%-15%. A proposed explanation...
  • Stellar noise for 4529 Kepler solar-type dwarfs

    An earlier study of the Kepler Mission noise properties on timescales of primary relevance to detection of exoplanet transits found that higher than expected noise followed, to...
  • From binaries to multiples. II. Statistical data

    Statistics of hierarchical multiplicity among solar-type dwarfs are studied using the distance-limited sample of 4847 targets presented in the accompanying Paper I. Known facts...
  • From binaries to multiples. I. The FG-67 sample

    Data on the multiplicity of F- and G-type dwarf stars within 67pc of the Sun are presented. This distance-limited sample based on the Hipparcos catalog contains 4847 primary...
  • SpeX library of L-type dwarfs

    We report the discovery of the L dwarf WISE J174102.78-464225.5, which was discovered as part of a search for nearby L dwarfs using the Wide-field Infrared Survey Explorer...
  • Close white dwarf + M dwarf binaries (WD+dM)

    We present a study of close white dwarf and M dwarf (WD+dM) binary systems and examine the effect that a close companion has on the magnetic field generation in M dwarfs. We use...
  • Rotational velocities in early-M stars

    We present a catalog of rotation and chromospheric activity in a sample of 334 M dwarfs of spectral types M0-M4.5 populating the parameter space around the boundary to full...
  • Low-mass visual companions to nearby G-dwarfs

    A complete census of wide visual companions to nearby G-dwarf stars can be achieved by selecting candidates from the Two Micron All Sky Survey (2MASS) Point-Source Catalog and...
  • Wide companions of low-mass stars and brown dwarfs

    We present the results of a deep-imaging search for wide companions to low-mass stars and brown dwarfs using NSFCam on the Infrared Telescope Facility. We searched a sample of...
  • HST proper-motions of M4 main-sequence stars

    We present new results from a photometric study of the main-sequence stars in M4 (NGC 6121=C1620-264), the closest globular cluster to the Sun. Multifield, multiepoch...
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