An Improved Metallicity Calibration with UBV Photometry

Küçük Resim Yok

Tarih

2011

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Csiro Publishing

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

We used the data of 701 stars covering the colour index interval 0.32 < B - V <= 1.16, with metallicities -1.76 <= [Fe/H] <= +0.40 dex. The data were taken from the PASTEL catalogue and estimated metallicity-dependent guillotine factors, which provide a more accurate metallicity calibration. We reduced the metallicities of 11 different authors to the metallicities of Valenti & Fischer (2005), and thus obtained a homogeneous set of data which increased the accuracy of the calibration, i.e. [Fe/H] = -4.316d delta(2)(0.6) - 3.557 delta(0.6) + 0.105. Comparison of the metallicity residuals for two sets of data based on the metallicity-dependent guillotine factors with the ones obtained via metal-free guillotine factors shows that metallicities estimated by means of the new guillotine factors are more accurate than the other ones. This advantage can be used in the metallicity gradient investigation of the Galactic components, i.e. thin disc, thick disc, and halo.

Açıklama

Anahtar Kelimeler

stars: abundances, stars: metallicity calibration, stars: metal poor

Kaynak

Publications Of The Astronomical Society Of Australia

WoS Q Değeri

Q2

Scopus Q Değeri

Q1

Cilt

28

Sayı

2

Künye