Block, D L; Combes, F; Puerari, I; Freeman, Kenneth; Stockton, A; Canalizo, G; Jarrett, Thomas H; Groess, R; Worthey, G; Gehrz, R. D.; Woodward, Chick E; Polomski, E. F.; Fazio, G. G.
In an earlier study of the spiral galaxy M 33, we photometrically identified arcs or outer spiral arms of intermediate age (0.6-2 Gyr) carbon stars precisely at the commencement of the HI-warp. Stars in the arcs were unresolved, but were likely thermally-pulsing asymptotic giant branch carbon stars. Here we present Keck I spectroscopy of seven intrinsically bright and red target stars in the outer, northern arc in M 33. The target stars have estimated visual magnitudes as faint as V ∼ 25m....[Show more]
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.