Variable stars in the bulge globular cluster NGC 6401

Y. Tsapras, A. Arellano Ferro, D. M. Bramich, R. Figuera Jaimes, N. Kains, R. Street, M. Hundertmark, K. Horne, M. Dominik, C. Snodgrass

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We present a study of variable stars in globular cluster NGC 6401. The cluster is only 5.3º 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'), 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.
Original languageEnglish
Pages (from-to)2489-2504
JournalMonthly Notices of the Royal Astronomical Society
Volume465
Issue number2
Early online date27 Oct 2016
DOIs
Publication statusPublished - Feb 2017

Keywords

  • Stars: variables: RR Lyrae
  • Globular clusters: individual: NGC 6401

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