简介

Stellar parameters and metallicities are being determined for a large sample (>150 stars) using multiphase high resolution data acquired at McDonald Observatory and a number of other observatories. This project is a collaboration with Sergei Andrievsky (Odessa, The Ukraine). The latest paper concerning the Galactic abundance gradient aspect of this project is Luck, Kovtyukh, & Andrievsky 2006 (AJ, July). We have investigated abundances in the young open cluster M25 comparing B star abundances with evolved objects (Comparative abundance analysis of the hot main sequence stars and their progeny in open cluster M 25,” 2000, A&A, 361, 189 with S.M. Andrievsky, V.V. Kovtyukh, S.A. Korotin, & Y.V. Beletsky) and have found one object which we believe to be a first crossing Cepheid (“SV Vul: a first crossing Cepheid?,” 2001, A&A 373, 589 with S.M. Andrievsky and V.V. Kovtyukh.). We have also considered multiphase abundances for these stars and our latest results are found in Andrievsky, Luck, & Kovtyukh 2005 (AJ 130, 1880).