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Title:
New Evidence Supporting Membership for TW Nor in Lyngå 6 and the Centaurus Spiral Arm
Authors:
Majaess, Daniel; Turner, David; Moni Bidin, Christian; Mauro, Francesco; Geisler, Douglas; Gieren, Wolfgang; Minniti, Dante; Chené, André-Nicolas; Lucas, Philip; Borissova, Jura; Kurtev, Radostn; Dékány, Istvan; Saito, Roberto K.
Affiliation:
AA(Department of Astronomy & Physics, Saint Mary's University, Halifax, Nova Scotia, Canada ), AB(Department of Astronomy & Physics, Saint Mary's University, Halifax, Nova Scotia, Canada ), AC(Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ), AD(Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ), AE(Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ), AF(Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ), AG(Departamento Astronomia y Astrofísica, Pontificia Universidad Catolica de Chile, Santiago, Chile ; Vatican Observatory, Vatican City, Italy ; Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA ), AH(Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ; Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile ), AI(Centre for Astrophysics Research, University of Hertfordshire, Hatfield, UK ), AJ(Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile ), AK(Departamento de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile ), AL(Konkoly Observatory, Budapest, Hungary), AM(Departamento Astronomia y Astrofísica, Pontificia Universidad Catolica de Chile, Santiago, Chile )
Publication:
The Astrophysical Journal Letters, Volume 741, Issue 2, article id. L27, 4 pp. (2011). (ApJL Homepage)
Publication Date:
11/2011
Origin:
IOP
Astronomy Keywords:
dust, extinction, Hertzsprung-Russell and C-M diagrams, infrared: stars, open clusters and associations: individual: Lynga 6, stars: distances, stars: variables: Cepheids
DOI:
10.1088/2041-8205/741/2/L27
Bibliographic Code:
2011ApJ...741L..27M

Abstract

The putative association between the 10{.\!\!^{ d}}8 classical Cepheid TW Nor and the open cluster Lyngå 6 has generated considerable debate in the literature. New JHKs photometry in tandem with existing radial velocities for Lyngå 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 Lyngå 6 are: d = 1.91 ± 0.10 kpc, E(J - H) = 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 VI, 0 = (- 3.37 ± 0.08)log P 0 - 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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