Publications of the Astronomical Society of Australia Publications of the Astronomical Society of Australia Society
Publications of the Astronomical Society of Australia

The Metallicity Distribution of Distant F and G Type Stars in the CFHT Legacy Survey Deep Field

Yüksel Karataş A C , Mukremin Kilic B , Orhan Güneş A and Füsun Limboz A
+ Author Affiliations
- Author Affiliations

A Istanbul University, Science Faculty, Department of Astronomy and Space Sciences, 34119, Istanbul, Türkiye

B Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA

C Corresponding author. Email:

Publications of the Astronomical Society of Australia 26(1) 1-6
Submitted: 23 June 2008  Accepted: 15 September 2008   Published: 2 April 2009


We study the metal abundances of F and G type stars in the Galactic disk and halo using the Canada–France–Hawaii Telescope Legacy Survey D4 field. For a sample of stars within 7 kpc of the Galactic plane, we derive mean abundance values of [Fe/H] = –0.77 ± 0.36 dex for the thick disk, and [Fe/H] = –1.42 ± 0.98 dex for the stellar halo, respectively. These metallicites are consistent with the metallicity estimates from the Sloan Digital Sky Survey Data Release 6. We do not find a vertical abundance gradient for the thick disk between 1 kpc and 4 kpc. However, stars within 1 kpc of the Galactic plane are saturated in our dataset, and therefore we cannot rule out the observed vertical metallicity gradient for the thick disk stars in the SDSS. Moreover, we find a negative trend in the halo metallicity with increasing distance from the Galactic plane. This trend could be due to a contribution from an increasing number of very metal poor stars that belong to the outer halo. However, systematic effects in photometric metallicities are largest for the most metal poor stars, and therefore these effects cannot be ruled out.

Keywords: stars: abundances: stars: distances: techniques: photometric


We thank D. An for useful discussions, C. Benoist for providing us with the CFHTLS data, and the anonymous referee for useful comments. This work is partly based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the CanadaFranceHawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada–France–Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS.


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1 This sample may be contaminated by metal-rich stars that belong to the high velocity tail of the thin disk distribution.

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