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

doi:10.1093/mnras/stw2773

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	2489-2504
Journal	Monthly Notices of the Royal Astronomical Society
Volume	465
Issue number	2
Early online date	27 Oct 2016
DOIs	https://doi.org/10.1093/mnras/stw2773
Publication status	Published - Feb 2017

Keywords

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

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10.1093/mnras/stw2773

Tsapras_2017_Variable_MNRAS_AAM
© 2016, the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.academic.oup.com / https://doi.org/10.1093/mnras/stw2773
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Cite this

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title = "Variable stars in the bulge globular cluster NGC 6401",

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.",

keywords = "Stars: variables: RR Lyrae, Globular clusters: individual: NGC 6401",

author = "Y. Tsapras and {Arellano Ferro}, A. and Bramich, {D. M.} and Jaimes, {R. Figuera} and N. Kains and R. Street and M. Hundertmark and K. Horne and M. Dominik and C. Snodgrass",

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month = feb,

doi = "10.1093/mnras/stw2773",

language = "English",

volume = "465",

pages = "2489--2504",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press",

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TY - JOUR

T1 - Variable stars in the bulge globular cluster NGC 6401

AU - Tsapras, Y.

AU - Arellano Ferro, A.

AU - Bramich, D. M.

AU - Jaimes, R. Figuera

AU - Kains, N.

AU - Street, R.

AU - Hundertmark, M.

AU - Horne, K.

AU - Dominik, M.

AU - Snodgrass, C.

PY - 2017/2

Y1 - 2017/2

N2 - 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.

AB - 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.

KW - Stars: variables: RR Lyrae

KW - Globular clusters: individual: NGC 6401

U2 - 10.1093/mnras/stw2773

DO - 10.1093/mnras/stw2773

M3 - Article

SN - 0035-8711

VL - 465

SP - 2489

EP - 2504

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Variable stars in the bulge globular cluster NGC 6401

Abstract

Keywords

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