SPECTROSCOPIC SURVEY of G and K DWARFS in the HIPPARCOS CATALOG. I. COMPARISON between the HIPPARCOS and PHOTOMETRIC PARALLAXES

Bokyoung Kim, Deokkeun An, John R. Stauffer, Young Sun Lee, Donald M. Terndrup, Jennifer A. Johnson

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The tension between the Hipparcos parallax of the Pleiades and other independent distance estimates continues even after the new reduction of the Hipparcos astrometric data and the development of a new geometric distance measurement for the cluster. A short Pleiades distance from the Hipparcos parallax predicts a number of stars in the solar neighborhood that are sub-luminous at a given photospheric abundance. We test this hypothesis using the spectroscopic abundances for a subset of stars in the Hipparcos catalog, which occupy the same region as the Pleiades in the color-magnitude diagram. We derive stellar parameters for 170 nearby G- and K-type field dwarfs in the Hipparcos catalog based on high-resolution spectra obtained using KPNO 4 m echelle spectrograph. Our analysis shows that, when the Hipparcos parallaxes are adopted, most of our sample stars follow empirical color-magnitude relations. A small fraction of stars are too faint compared to main-sequence fitting relations by mag, but the differences are marginal at a level, partly due to relatively large parallax errors. On the other hand, we find that the photometric distances of stars showing signatures of youth as determined from lithium absorption line strengths and chromospheric activity indices are consistent with the Hipparcos parallaxes. Our result is contradictory to a suggestion that the Pleiades distance from main-sequence fitting is significantly altered by stellar activity and/or the young age of its stars, and provides an additional supporting evidence for the long-distance scale of the Pleiades.

Original languageEnglish
Article number19
JournalAstrophysical Journal, Supplement Series
Volume222
Issue number2
DOIs
StatePublished - 1 Feb 2016

Keywords

  • open clusters and associations: individual (the Pleiades)
  • solar neighborhood
  • stars: abundances
  • stars: distances

Fingerprint

Dive into the research topics of 'SPECTROSCOPIC SURVEY of G and K DWARFS in the HIPPARCOS CATALOG. I. COMPARISON between the HIPPARCOS and PHOTOMETRIC PARALLAXES'. Together they form a unique fingerprint.

Cite this