Doppler images from dual-site observations of southern rapidly rotating stars - I. Differential rotation on PZ Tel

JR Barnes, Andrew Collier Cameron, DJ James, J-F Donati

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82 Citations (Scopus)

Abstract

We present Doppler images of the young, late-type star PZ Tel from spectroscopic observations at two epochs. The 0.95-d period necessitated dual-site observations in order to obtain full phase coverage. The resulting maximum entropy reconstructions based on least-squares deconvolved profiles derived from similar to 2800 photospheric absorption lines reveal the presence of starspots at ail latitudes. By cross-correlation of constant-latitude strips from the images, we derive a measure of rotation as a function of latitude. The rate of surface shear is found to be in close agreement with the solar value. Ha absorption transients reveal several prominences to be present at the time of observation. We also examine further evidence for the young evolutionary status of PZ Tel through radial velocity, and lithium abundance.

Original languageEnglish
Pages (from-to)pp.162-174.
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume314
Issue number1
Publication statusPublished - 1 May 2000

Keywords

  • line : profiles
  • methods : data analysis
  • stars : activity
  • stars : individual, PZ Tel
  • stars : late-type
  • stars : rotation
  • SOLAR-TYPE STARS
  • ACTIVE-CHROMOSPHERE STARS
  • STELLAR SURFACE-STRUCTURE
  • ALPHA-PERSEI CLUSTER
  • MAIN-SEQUENCE STARS
  • LITHIUM ABUNDANCES
  • LOCAL ASSOCIATION
  • EVOLUTIONARY STATUS
  • COOL STARS
  • AB DORADUS

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