85 datasets found

Keywords: a stars

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  • The International Deep Planet Survey. I.

    Breakthrough direct detections of planetary companions orbiting A-type stars confirm the existence of massive planets at relatively large separations, but dedicated surveys are...
  • Rotation in A-F stars

    Measurements of projected rotational velocities and the rotational profile of stars with spectral types A-F are presented. This work completes previous measurements by line...
  • Rotational velocities of A-type stars. IV.

    In previous works of this series, we have shown that late B- and early A-type stars have genuine bimodal distributions of rotational velocities and that late A-type stars lack...
  • Variability of A- and F-stars from Kepler

    The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. We present a first general characterization of...
  • A and F stars abundances in the Hyades

    Abundances of 15 chemical elements have been derived for 28 F and 16 A stars members of the Hyades open cluster in order to set constraints on self-consistent evolutionary...
  • X-ray emission from A-type stars

    Being fully radiative, stars of spectral type A are not expected to harbor magnetic dynamos and hence such stars are not expected to produce X-ray emission. Indeed, while the...
  • ubvy photometry of 4 magnetic CP stars

    Differential Stroemgren uvby observations from the Four College Automated Photoelectric Telescope are presented for the magnetic Chemically Peculiar (mCP) stars HD 32633, Aur,...
  • uvby photometry of 1 HgMn and 3 mCP stars

    Differential Stroemgren uvby observations from the Four College Automated Photoelectric Telescope are presented for the magnetic CP (mCP) stars HR 2258, MW Vul, and HR 9017 and...
  • Abundances of A-F stars

    Fundamental parameters and abundances of 140 A and F-type stars are presented. The barycentric Julian dates and signal-to-noise ratios are also given. Cone search capability for...
  • Rotational velocities of A-type stars. I.

    Within the scope of a Key Programme determining fundamental parameters of stars observed by HIPPARCOS, spectra of 525 B8 to F2-type stars brighter than V=8 have been collected...
  • Rotating models of A and F stars

    Magnitude differences between rotating and non-rotating copartners for a grid of models with solar metallicity are tabulated here. The results are expressed in terms of the...
  • General Catalogue of Ap and Am stars

    A catalogue of 8205 known or suspected Ap, HgMn and Am stars is presented. This is a major update of the catalogue of Ap and Am stars (Renson et al., 1991, III/162). It includes...
  • Catalogue of H line profiles of 235 B-F stars

    There are given 1064 profiles of the hydrogen lines H{gamma} and H{delta} for 235 B,A,F-stars obtained at the Main Stellar Spectrograph of the 6-m telescope in 1978-1986 in the...
  • Rotation of Evolving A and F Stars

    The authors have studied a vertical strip in the HR diagram covering the range of spectral types A5 through F9. Rotational velocities for a total of 579 stars of all luminosity...
  • General Catalogue of Ap and Am stars

    A catalogue of all Ap and Am stars ever discovered is presented. It contains 6684 objects, including those which have been wrongly considered as Ap or Am stars, and those which...
  • Radial Velocities of Bright Population II F Stars

    This catalog presents new radial velocity determinations, based on 2nm/mm Coude plates, for 146 southern stars brighter than m(v)=8.3. Drawn from the catalog of uvby-{beta}...
  • K-line photometry of Southern A stars

    The photoelectric measurements of the strength of the Calcium K-line has been extended by 223 stars of predominantly southern or equatorial declinations which are well...
  • K-Line Photometry of A Stars

    A narrow-band spectrometer, compensated for seeing and transparency variations, has been constructed and used to measure the strength of the calcium K-line (3933.68{AA}) in 146...
  • Case low-dispersion Survey X.

    Position, estimated magnitudes, and finding charts are provided for 540 A-F stars in the region 8h00m <R.A< 11h10m and +29.0 <Decl.<+43.0 (1950). The Galactic...
  • Case low-dispersion Survey VI

    Positions, estimated magnitudes, and finding charts (when needed) are provided for 183 A-F stars (including both Population I and horizontal-branch stars) contained within the...
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