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

Majaess, D., Turner, D., Moni Bidin, C., Mauro, F., Geisler, D., Gieren, W., Chené, A.-N., Minniti, D., Saito, R.K., Minniti, D., Minniti, D., Chené, A.-N., Borissova, J., Kurtev, R., Lucas, P.W. and Dékny, I. (2011) New evidence supporting membership for TW nor in Lyngå 6 and the centaurus spiral arm. Astrophysical Journal Letters, 741 (2): L27. ISSN 2041-8213

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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).

Item Type	Article
Identification Number	10.1088/2041-8205/741/2/L27
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Keywords	dust, extinction, hertzsprung-russell and c-m diagrams, infrared: stars, open clusters and associations: individual: (lynga 6), stars: distances, stars: variables: cepheids
Date Deposited	15 May 2025 12:17
Last Modified	25 Feb 2026 00:25