Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars*

A. Arellano Ferro; R. Figuera Jaimes; Sunetra Giridhar; D. M. Bramich; J. V. Hernández Santisteban; K. Kuppuswamy

doi:10.1111/j.1365-2966.2011.19201.x

Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars*

A. Arellano Ferro, R. Figuera Jaimes, Sunetra Giridhar, D. M. Bramich, J. V. Hernández Santisteban, K. Kuppuswamy

School of Physics and Astronomy

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

Abstract

We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than V˜ 18.5 mag even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RR1 stars and 13 SX Phe stars. A detailed identification chart is given for all the variable stars in the field of our images of the cluster. Periodicities were calculated for all RR Lyrae and SX Phe stars and a critical comparison is made with previous determinations.

Original language	English
Pages (from-to)	2265-2284
Journal	Monthly Notices of the Royal Astronomical Society
Volume	416
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2011.19201.x
Publication status	Published - 1 Sept 2011

Keywords

stars: variables: RR Lyrae
globular clusters: individual: NGC 5024

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10.1111/j.1365-2966.2011.19201.x

http://adsabs.harvard.edu/abs/2011MNRAS.416.2265A

Cite this

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title = "Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars*",

abstract = "We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than V˜ 18.5 mag even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RR1 stars and 13 SX Phe stars. A detailed identification chart is given for all the variable stars in the field of our images of the cluster. Periodicities were calculated for all RR Lyrae and SX Phe stars and a critical comparison is made with previous determinations.",

keywords = "stars: variables: RR Lyrae, globular clusters: individual: NGC 5024",

author = "{Arellano Ferro}, A. and {Figuera Jaimes}, R. and Sunetra Giridhar and Bramich, {D. M.} and {Hern{\'a}ndez Santisteban}, {J. V.} and K. Kuppuswamy",

year = "2011",

month = sep,

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doi = "10.1111/j.1365-2966.2011.19201.x",

language = "English",

volume = "416",

pages = "2265--2284",

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

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publisher = "Oxford University Press",

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TY - JOUR

T1 - Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars*

AU - Arellano Ferro, A.

AU - Figuera Jaimes, R.

AU - Giridhar, Sunetra

AU - Bramich, D. M.

AU - Hernández Santisteban, J. V.

AU - Kuppuswamy, K.

PY - 2011/9/1

Y1 - 2011/9/1

N2 - We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than V˜ 18.5 mag even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RR1 stars and 13 SX Phe stars. A detailed identification chart is given for all the variable stars in the field of our images of the cluster. Periodicities were calculated for all RR Lyrae and SX Phe stars and a critical comparison is made with previous determinations.

AB - We report CCD V and I time series photometry of the globular cluster NGC 5024 (M53). The technique of difference image analysis has been used which enables photometric precisions better than 10 mmag for stars brighter than V˜ 18.5 mag even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RR1 stars and 13 SX Phe stars. A detailed identification chart is given for all the variable stars in the field of our images of the cluster. Periodicities were calculated for all RR Lyrae and SX Phe stars and a critical comparison is made with previous determinations.

KW - stars: variables: RR Lyrae

KW - globular clusters: individual: NGC 5024

U2 - 10.1111/j.1365-2966.2011.19201.x

DO - 10.1111/j.1365-2966.2011.19201.x

M3 - Article

SN - 0035-8711

VL - 416

SP - 2265

EP - 2284

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

Exploring the variable stars in the globular cluster NGC 5024 (M53): new RR Lyrae and SX Phoenicis stars*

Abstract

Keywords

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