University of Hertfordshire

From the same journal

From the same journal

By the same authors


  • 906046

    Accepted author manuscript, 979 KB, PDF document

  • D. Majaess
  • D. Turner
  • C. Moni Bidin
  • F. Mauro
  • D. Geisler
  • W. Gieren
  • A.-N. Chené
  • D. Minniti
  • R.K. Saito
  • D. Minniti
  • D. Minniti
  • A.-N. Chené
  • J. Borissova
  • R. Kurtev
  • P.W. Lucas
  • I. Dékny
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Original languageEnglish
Article numberL27
Number of pages4
JournalAstrophysical Journal Letters
Publication statusPublished - 2011


The putative association between the 10. 8 classical Cepheid TW Nor and the open cluster Lyngå 6 has generated considerable debate in the literature.NewJHK photometry in tandem with existing radial velocities for Lyngå 6 stars implies cluster membership for TWNor and establishes the variable as a high-weight calibrator for classical Cepheid relations. Fundamental mean parameters determined forLyngå 6 are: d = 1.91±0.10 kpc,E(JH) = 0.38±0.02, and log τ= 7.9 ± 0.1. The Benedict et al./Turner Galactic VIc Wesenheit function was revised using TW Nor's new parameters:W = (3.37±0.08) log P 2.48±0.08. TW Nor/Lyngå 6 lie beyond the Sagittarius-Carina spiral arm and occupy the Centaurus arm, along with innumerable young Cepheids and clusters (e.g., VW Cen and VVV CL070).


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