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Variable stars in the bulge globular cluster NGC 6401

Tsapras, Y.; Arellano Ferro, A.; Bramich, D. M.; Figuera Jaimes, R.; Kains, N.; Street, R.; Hundertmark, M.; Horne, K.; Dominik, M. and Snodgrass, C. (2017). Variable stars in the bulge globular cluster NGC 6401. Monthly Notices of the Royal Astronomical Society, 465(2) pp. 2489–2504.

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We present a study of variable stars in globular cluster NGC 6401. The cluster is only 5°.3 away from the Galactic Centre and suffers from strong differential reddening. The photometric precision afforded us by difference image analysis resulted in improved sensitivity to variability in formerly inaccessible interior regions of the cluster. We find 23 RRab and 11 RRc stars within one cluster radius (2.4 arcmin), for which we provide coordinates, finder-charts and time series photometry. Through Fourier decomposition of the RR Lyrae star light curves we derive a mean metallicity of [Fe/H]UVES = −1.13 ± 0.06 ([Fe/H]ZW = −1.25 ± 0.06), and a distance of d ≈ 6.35 ± 0.81 kpc. Using the RR Lyrae population, we also determine that NGC 6401 is an Oosterhoff type I cluster.

Item Type: Journal Item
Copyright Holders: 2016 The Authors
ISSN: 1365-2966
Keywords: variable stars; globular clusters
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 48354
Depositing User: Colin Snodgrass
Date Deposited: 06 Feb 2017 10:23
Last Modified: 02 May 2019 11:49
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