Quintuplet Cluster

8 and 10 are previously known He I emission-line stars. 1, 2, 3, 4 and 9 are thought to be enshrouded protostars. Nomenclature from Moneti, A., Glass, I. S., and Moorwood, A. F. M. 1994, MNRAS, 268, 194

Spectra for WC9 Star and LBV Candidate

Reference: Figer, Donald F., McLean, Ian S., Morris, Mark, Two New Wolf-Rayet Stars and a Luminous Blue Variable Star in the Quintuplet (AFGL 2004) Near the Galactic Center, Astrophysical Journal Letters, 447, L29, 1995.