Better distances to open clusters through calibrated isochrones

D. An, D. M. Terndrup, M. H. Pinsonneault

Research output: Contribution to journalConference articlepeer-review


We present a progress report on our efforts to improve the calibration of theoretical isochrones using nearby stars and clusters with accurate parallaxes. Previously, we confirmed that several widely-used color-temperature relations have significant systematic errors, and proposed an adjusted color-temperature relation in BVIcKs based on the Hyades. Here, we show that these calibrated isochrones give internally consistent distances to nearby open clusters at the metal abundances indicated from high-resolution spectra. Finally, we present new time-series photometry of spotted variable stars to explore the causes of the significant departures from the isochrone lower main-sequence seen in the photometry of young open clusters.

Original languageEnglish
Pages (from-to)395-398
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number560 I
StatePublished - 2005
Event13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany
Duration: 5 Jul 20049 Jul 2004


  • Hertzsprung-Russell (HR) and C-M diagrams
  • Open clusters and associations: individual: Hyades, Praesepe, Pleiades
  • Stars: abundances
  • Stars: activity
  • Stars: distances
  • Stars: evolution


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