Physical parameters of RR lyrae stars in the globular cluster NGC 5466

The oosterhoff dichotomy

V. Rojas López, A. Arellano Ferro, S. Giridhar, D. M. Bramich

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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 distance of 14.8±0.4 kpc for the cluster and to other physical parameters of astrophysical relevance for individual RR Lyrae stars. When a comparison of the mean physical parameters in globular clusters, analysed by the same technique, is performed, clear insights of the stellar evolution on the Horizontal Branch are obtained. The origin of the Oosterho dichotomy is clearly of evolutionary nature, being age the determining factor.

Original languageEnglish
Title of host publicationRevista Mexicana de Astronomia y Astrofisica: Serie de Conferencias
Pages49
Number of pages1
Volume26
Publication statusPublished - 2006
Externally publishedYes
EventXI IAU Regional Latin American Meeting of Astronomy, LARIM2005 - Pucon, Chile
Duration: 12 Dec 200516 Dec 2005

Other

OtherXI IAU Regional Latin American Meeting of Astronomy, LARIM2005
CountryChile
CityPucon
Period12/12/0516/12/05

Fingerprint

dichotomies
globular clusters
stars
stellar evolution
subtraction
light curve
photometry
charge coupled devices
astrophysics
decomposition
parameter
method
comparison

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

López, V. R., Ferro, A. A., Giridhar, S., & Bramich, D. M. (2006). Physical parameters of RR lyrae stars in the globular cluster NGC 5466: The oosterhoff dichotomy. In Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias (Vol. 26, pp. 49)

Physical parameters of RR lyrae stars in the globular cluster NGC 5466 : The oosterhoff dichotomy. / López, V. Rojas; Ferro, A. Arellano; Giridhar, S.; Bramich, D. M.

Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias. Vol. 26 2006. p. 49.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

López, VR, Ferro, AA, Giridhar, S & Bramich, DM 2006, Physical parameters of RR lyrae stars in the globular cluster NGC 5466: The oosterhoff dichotomy. in Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias. vol. 26, pp. 49, XI IAU Regional Latin American Meeting of Astronomy, LARIM2005, Pucon, Chile, 12/12/05.
López VR, Ferro AA, Giridhar S, Bramich DM. Physical parameters of RR lyrae stars in the globular cluster NGC 5466: The oosterhoff dichotomy. In Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias. Vol. 26. 2006. p. 49
López, V. Rojas ; Ferro, A. Arellano ; Giridhar, S. ; Bramich, D. M. / Physical parameters of RR lyrae stars in the globular cluster NGC 5466 : The oosterhoff dichotomy. Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias. Vol. 26 2006. pp. 49
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