Abundance analysis of four members of the metal-rich open cluster NGC 6253

作者：Montalto M^*; Santos N C; Villanova S; Pace G; Piotto G; Desidera S; De Marchi F; Pasquini L; Saviane I

来源：Monthly Notices of the Royal Astronomical Society, 2012, 423(4): 3039-3048.

DOI：10.1111/j.1365-2966.2012.21040.x

• techniques: spectroscopic
• stars: abundances
• open clusters and associations: individual: NGC 6253

We report on VLT/UVES high-resolution spectra of four members of the old metal-rich open cluster NGC 6253: a main-sequence star, two red-clump stars and a blue straggler. We performed equivalent width analysis and derived Fe, Si, Ca, Ti, Cr and Ni abundances as well as abundance ratios. For our main-sequence star, we obtained a metallicity of (rms), whereas for the two giants we found that our metallicities are on average +0.19 +/- 0.13 (rms), lower than what was determined for the same stars in previous studies. We also found that, within the uncertainties, the abundance ratios of a and iron-peak elements match those in the solar surroundings, with the possible exception of Si in two giant stars in our sample.

• 出版日期2012-7