Spot patterns and differential rotation in the eclipsing pre-cataclysmic variable binary, V471 Tau

G A J Hussain, C A Prieto, S H Saar, M Still

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We present surface spot maps of the K2V primary star in the pre-cataclysmic variable binary system, V471 Tau. The spot maps show the presence of large high-latitude spots located at the sub-white dwarf longitude region. By tracking the relative movement of spot groups over the course of four nights (eight rotation cycles), we measure the surface differential rotation rate of the system. Our results reveal that the star is rotating rigidly with a surface shear rate, d Omega= 1.6 +/- 6 mrad d(-1). The single active star AB Dor has a similar spectral type, rotation period and activity level as the K star in V471 Tau, but displays much stronger surface shear (46 < d Omega < 58 mrad d(-1)). Our results suggest that tidal locking may inhibit differential rotation; this reduced shear, however, does not affect the overall magnetic activity levels in active K dwarfs.

Original languageEnglish
Pages (from-to)1699-1708
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume367
DOIs
Publication statusPublished - 21 Apr 2006

Keywords

  • binaries : eclipsing
  • stars : imaging
  • stars : individual : V471 Tau
  • stars : late-type
  • stars : magnetic fields
  • stars : spots
  • HUBBLE-SPACE-TELESCOPE
  • ORBITAL PERIOD MODULATION
  • COOL ACTIVE STARS
  • WHITE-DWARF
  • AB-DORADUS
  • CLOSE BINARIES
  • MAGNETIC TOPOLOGY
  • MAIN-SEQUENCE
  • DYNAMO
  • DISTRIBUTIONS

Fingerprint

Dive into the research topics of 'Spot patterns and differential rotation in the eclipsing pre-cataclysmic variable binary, V471 Tau'. Together they form a unique fingerprint.

Cite this