New Evidence Supporting Membership for TW Nor in Lyngå 6 and the Centaurus Spiral Arm

The putative association between the classical Cepheid TW Nor and the open cluster Lynga 6 has generated considerable debate in the literature. New JHKs photometry in tandem with existing radial velocities for Lynga 6 stars implies cluster membership for TW Nor and establishes the variable as a high...

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Bibliographic Details
Published in:	Astrophysical journal. Letters 2011-11, Vol.741 (2), p.L27-jQuery1323914804348='48'
Main 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
Format:	Article
Language:	eng
Subjects:	ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CEPHEIDS DIAGRAMS DISTANCE PHOTOMETRY RADIAL VELOCITY STAR CLUSTERS
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Summary:	The putative association between the classical Cepheid TW Nor and the open cluster Lynga 6 has generated considerable debate in the literature. New JHKs 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 Delta *t = 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/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).
ISSN:	2041-8205 2041-8213