525 datasets found

Keywords: dwarf stars

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  • Precise temperature of F-K field dwarfs

    Highly precise temperatures (sigma=10-15K) have been determined from line depth ratios for a set of 248 F-K field dwarfs of about solar metallicity (-0.5<[Fe/H]<+0.4),...
  • Stellar magnetic rotational phase curves

    Magnetized stars usually exhibit periodic variations of the effective (longitudinal) magnetic field B_e_ caused by their rotation. We present a catalog of magnetic rotational...
  • UBV(RI)c photometry of AB Dor

    We analyse photometric observations of the young active dwarf AB Dor, spanning more than 20 years, and including previously unpublished data. The data in table2.dat was observed...
  • Detailed abundance analysis of 102 F and G dwarfs

    From a detailed elemental abundance analysis of 102 F and G dwarf stars we present abundance trends in the Galactic thin and thick disks for 14 elements (O, Na, Mg, Al, Si, Ca,...
  • Southern Infrared Proper Motion Survey

    We present the first results from the Southern Infrared Proper Motion Survey. Using 2 Micron All Sky Survey () data along with that of the SuperCOSMOS sky survey (Hambly et al.,...
  • SMC NGC 346-11 and AV 304 spectra

    An analysis of high-resolution VLT/UVES spectra of two B-type main sequence stars, NGC 346-11 and AV 304, in the Small Magellanic Cloud (SMC), has been undertaken, using the...
  • 32 DENIS nearby red dwarfs

    We present spectra of 36 nearby star candidates and 3 red giant candidates, identified in the DENIS database. 32 of the dwarf candidates are nearby red dwarfs, with spectral...
  • New very low-mass members in Taurus

    We have performed a large scale optical survey of the Taurus cloud, covering a total area of 28deg^2^, and encompassing the densest parts of the cloud as well as their...
  • Chemical abundances of 32 mildly metal-poor stars

    We present photospheric abundances of the O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Ni, and Ba elements for 32 mildly metal-poor stars with [Fe/H]~-0.7. High resolution and high...
  • Barnes-Evans relations for dwarfs

    Barnes-Evans type relations provide an empirical relationship between the surface brightness of stars and their color. They are widely used for measuring the distances to stars...
  • Differential photometry of WX Cet

    WX Cet is a dwarf nova with rare outbursts of large amplitude. We compile the available data of WX Cet, compare the results with other SU UMa stars, and discuss our findings in...
  • Low-mass stars and brown dwarfs in Blanco 1

    We performed a deep wide field optical survey of the young (~100-150Myr) open cluster Blanco 1 to study its low mass population well down into the brown dwarf regime and...
  • Velocities of F-G-K stars in Blanco 1

    The nearby open cluster Blanco 1 is of considerable astrophysical interest for formation and evolution studies of open clusters because it is the third highest Galactic latitude...
  • Line abundances for solar stars

    We present the abundance measurements of several elements (Fe, Ca, Na, Ni, Ti, Al, Cr, Si) for 20 solar-type stars belonging to four Galactic open clusters: NGC 3680, IC 4651,...
  • Analysis of Collinder 69 stars with VOSA

    The physical properties of almost any kind of astronomical object can be derived by fitting synthetic spectra or photometry extracted from theoretical models to observational...
  • Lithium abundances of halo dwarfs

    The discovery of the Spite plateau in the abundances of ^7^Li^ for metal-poor stars led to the determination of an observationally deduced primordial lithium abundance. However,...
  • Physical parameters from JHK flux

    The effective temperature scale of FGK stars, especially at the lowest metallicities remains a major problem in the chemical abundance analysis of metal-poor stars. We present a...
  • Velocities of 1253 F-K dwarfs in open clusters

    A long-term monitoring of solar-type dwarfs in 13 nearby open clusters, d<500pc, was conducted during 19 years, but most individual radial velocities were not published, with...
  • Old MS stars in young moving groups

    The associations and moving groups of young stars are excellent laboratories to investigate the stellar formation in the solar neighborhood. Past results confirmed that a...
  • Infrared spectra of 9 T dwarfs

    Aims: We determine the effective temperature, surface gravity and projected rotational velocity of nine T dwarfs from the comparison of high-resolution near-infrared spectra and...
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