New evidence supporting membership for TW nor in Lyngå 6 and the centaurus spiral arm

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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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).
Original languageEnglish
Article numberL27
Number of pages4
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 2011


  • dust, extinction
  • Hertzsprung-Russell and C-M diagrams
  • infrared: stars
  • open clusters and associations: individual: (Lynga 6)
  • stars: distances
  • stars: variables: Cepheids


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