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Browsing by Author "Arellano Ferro, A"

Browsing by Author "Arellano Ferro, A"

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  • A new discussion on the M(v) - W(O I 7774 A) relationship for F-G stars in the light of high-resolution data 
    Arellano Ferro, A; Giridhar, S; Goswami, A (Royal Astronomical Society, 1991-05)
    High-resolution CCD data and a large group of F-G stars of fundamentally determined distances are used here to investigate the intrinsic nature of the M(v) - W(O I) relation and the effect of other atmospheric parameters ...
  • A new photometric study of M14 (NGC 6402): an interpretation of the horizontal branch and beyond 
    Yepez, M. A; Arellano Ferro, A; Deras, D; Bustos Fierro, I; Muneer, S; Schröder, K. -P (Oxford University Press on behalf of Royal Astronomical Society, 2022-03)
    We present a CCD VI photometric study of the globular cluster M14. Particular attention is given to the variable stars. This allowed new classifications and cluster membership considerations. New variables are reported: 3 ...
  • A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205) 
    Deras, D; Arellano Ferro, A; Lazaro, C; Bustos Fierro, I. H; Calderon, J. H; Muneer, S; Giridhar, S (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    We present the results from VI CCD time-series photometry of the globular cluster M13 (NGC 6205). From the Fourier decomposition of the light curves of RRab and RRc stars we found an average metallicity of [Fe/H]zw = −1.58 ...
  • New variables in M5 (NGC 5904) and some identification corrections 
    Arellano Ferro, A; Bramich, D. M; Giridhar, S; Luna, A; Muneer, S (Konkoly Observatory, 2015-04)
    We report twelve variables not previously detected in the globular cluster M5 (NGC 5904); one SX Phe and eleven semi-regular variables (SR). Their identifications, equatorial coordinates, ephemerides, and light curves are ...
  • NGC 6712: the variable star population of a tidally disrupted globular cluster 
    Deras, D; Arellano Ferro, A; Lazaro, C; Bustos Fierro, I. H; Calderon, J. H; Muneer, S; Giridhar, S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-04)
    We present an analysis of VI CCD time-series photometry of globular cluster NGC 6712. Our main goal is to study the variable star population as indicators of the cluster mean physical parameters. We employed the Fourier ...
  • Period changes in the RR Lyrae stars of NGC 6171 (M107) 
    Arellano Ferro, A; Rosenzweig, P; Luna, A; Deras, D; Muneer, S; Giridhar, S; Michel, R (WILEY-VCH Verlag GmbH & Co., 2018-02)
    Based on photometric data obtained between 1935 and 2017, O −C diagrams were built for 22 RR Lyrae stars in the globular cluster NGC 6171, leading to the discovery of secular period changes in four variables for which we ...
  • Physical parameters of RR Lyrae stars in NGC 6171 
    Deras, D; Arellano Ferro, A; Muneer, S; Giridhar, S; Michel, R (WILEY-VCH Verlag GmbH & Co., 2018-08)
    We present an analysis of VI CCD time series photometry of the globular cluster NGC 6171. The main goal is to determine individual physical parameters for single‐mode RR Lyrae stars present in the field of view of our ...
  • Physical parameters of RR Lyrae stars in the globular cluster NGC 5466: The Oosterhoff dichotomy 
    Rojas Lopez, V; Arellano Ferro, A; Giridhar, S; Bramich, D. M (Instituto de Astronomía, 2006-06)
    The highlights of CCD photometry of RR Lyrae stars in NGC 5466 are presented. The image subtraction method (Bramich et al. 2005) was used. The Fourier light curve decomposition, lead to an average [Fe/H]=-1.88+/-0.3 and a ...
  • Revisiting the variable star population in NGC 6229 and the structure of the horizontal branch 
    Arellano Ferro, A; Mancera Pina, P. E; Bramich, D. M; Giridhar, S; Ahumada, J. A; Kains, N; Kuppuswamy, K (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-01)
    We report an analysis of new V and I CCD time series photometry of the distant globular cluster NGC 6229. The principal aims were to explore the field of the cluster in search of new variables, and to Fourier decompose the ...
  • Spectroscopic analysis of four post-AGB candidates 
    Molina, R. E; Giridhar, S; Pereira, C. B; Arellano Ferro, A; Muneer, S (Institute de Astronomia, 2014-10)
    We have done a detailed abundance analysis of four unexplored cand idate post- Asymptotic Giant Branch(AGB) stars IRAS 13110- 6629, IRAS 175 79 - 3121, IRAS 18321- 1401 and IRAS 18489- 0629 using high resolution spectra. ...
  • The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53) 
    Arellano Ferro, A; Bramich, D. M; Figuera Jaimes, R; Giridhar, S; Kuppuswamy, K (Wiley-Blackwell, 2012-02)
    We report the discovery of amplitude and phase modulations typical of the Blazhko effect in 22 RRc and nine RRab type RR Lyrae stars in NGC 5024 (M53). This brings the confirmed Blazhko variables in this cluster to 23 RRc ...
  • Variable stars in NGC 4147 revisited: RR Lyrae stars new CCD VI photometry and physical parameters 
    Arellano Ferro, A; Rojas Galindo, F. C; Muneer, S; Giridhar, S (Universidad Nacional Autonoma De Mexico, 2018-10)
    We have calculated the physical parameters of the RR Lyrae stars in the globular cluster NGC 4147 via the Fourier decomposition of their light curves, using new data and well-established semi-empirical calibrations and ...
  • Variable stars in the globular cluster NGC 7492. New discoveries and physical parameter determination 
    Figuera Jaimes, R; Arellano Ferro, A; Bramich, D. M; Giridhar, S; Kuppuswamy, K (EDP Sciences, 2013-08)
    Aims. We have performed a photometric V,R,I CCD time-series analysis with a baseline of about eight years of the outer-halo globular cluster NGC 7492 with the aim of searching for new variables and using these (and the ...

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