Characterizing the AB Doradus Moving Group Via High Resolution Spectroscopy and Kinematic Traceback

Abstract

We present a detailed analysis of 10 proposed F and G members of the nearby, young moving group AB Doradus (ABD). Our sample was obtained using the 2.7m telescope at the McDonald Observatory with the coude echelle spectrograph, achieving R $\sim$ 60,000 and S/N $\sim$ 200. We derive spectroscopic T${}_{eff}$, log(g), [Fe/H], and microturbulance (v${}_t$) using a bootstrap method of the TGVIT software resulting in typical errors of 33K in T${}_{eff}$, 0.08 dex in log(g), 0.03 dex in [Fe/H], and 0.13 km s${}^{-1}$ in v${}_t$. Characterization of the ABD sample is performed in three ways: (1) Chemical homogeneity, (2) Kinematic Traceback, and (3) Isochrone fitting. We find the average metal abundance is [M/H] = -0.03 $\pm$ 0.06 with a traceback age of 125 Myrs. Our stars were fit to 3 different evolutionary models (Siess et al. 2000, Baraffe et al. 1998, and YREC) and we found the best match to our ABD sample is the YREC [M/H] = -0.1 model. In our sample of 10 stars, we identify 1 star which is a probable non-member, 3 enigmatic stars, and 6 stars with confirmed membership. We also present a list of chemically coherent stars from this study and the Barenfeld et al. (2013) study.

arXiv comment34 pages, 9 figures, 6 tables

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