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SPECTROSCOPIC SURVEY OF G AND K DWARFS IN THE HIPPARCOS CATALOG. I. COMPARISON BETWEEN THE HIPPARCOS AND PHOTOMETRIC PARALLAXES

Title
SPECTROSCOPIC SURVEY OF G AND K DWARFS IN THE HIPPARCOS CATALOG. I. COMPARISON BETWEEN THE HIPPARCOS AND PHOTOMETRIC PARALLAXES
Authors
Kim, BokyoungAn, DeokkeunStauffer, John R.Lee, Young SunTerndrup, Donald M.Johnson, Jennifer A.
Ewha Authors
안덕근
SCOPUS Author ID
안덕근scopus
Issue Date
2016
Journal Title
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN
0067-0049JCR Link1538-4365JCR Link
Citation
vol. 222, no. 2
Keywords
open clusters and associations: individual (the Pleiades)solar neighborhoodstars: abundancesstars: distances
Publisher
IOP PUBLISHING LTD
Indexed
SCI; SCIE; SCOPUS WOS scopus
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 colormagnitude relations. A small fraction of stars are too faint compared to main-sequence fitting relations by Delta M-V greater than or similar to 0.3 mag, but the differences are marginal at a 2 sigma 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 R'(HK) 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 longdistance scale of the Pleiades.
DOI
10.3847/0067-0049/222/2/19
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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