Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 741, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/741/2/L27
Keywords
dust, extinction; Hertzsprung-Russell and C-M diagrams; infrared: stars; open clusters and associations: individual (Lynga 6); stars: distances; stars: variables: Cepheids
Categories
Funding
- FONDAP Center for Astrophysics [15010003]
- BASAL CATA Center for Astrophysics and Associated Technologies [PFB-06]
- Ministry of Economics ICM [P07-021-F]
- Proyecto FONDECYT Regular [1090213]
- CONICYT through GEMINI [32080016]
- Science and Technology Facilities Council [ST/G002622/1] Funding Source: researchfish
- STFC [ST/G002622/1] Funding Source: UKRI
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The putative association between the 10.(d)8 classical Cepheid TW Nor and the open cluster Lynga 6 has generated considerable debate in the literature. New JHK(s) photometry in tandem with existing radial velocities for Lynga 6 stars implies cluster membership for TW Nor and establishes the variable as a high-weight calibrator for classical Cepheid relations. Fundamental mean parameters determined for Lynga 6 are: d = 1.91 +/- 0.10 kpc, E(J-H) = 0.38 +/- 0.02, and log tau = 7.9 +/- 0.1. The Benedict et al./Turner Galactic V-Ic Wesenheit function was revised using TW Nor's new parameters: W-VI,W-0 = (-3.37 +/- 0.08) log P-0-2.48 +/- 0.08. TW Nor/Lynga 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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