University of Hertfordshire

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  • 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
Volume741
Issue2
DOIs
Publication statusPublished - 2011

Abstract

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).

Notes

‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society

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