The star-formation history of LGS 3
Publications of the Astronomical Society of the Pacific | Published : 1997
LGS 3 presents the optical appearance of a dwarf spheroidal galaxy, but has a significant neutral hydrogen component. Photometry of its brightest stars with COSMIC at the prime focus of the Hale telescope shows a 108-yr-old population and a 1010-yr-old population. Either we are seeing a recent burst of star formation in a dwarf spheroidal galaxy, or, if intermediate-age populations are also present, we are witnessing a recent transition from a dwarf irregular to a dwarf spheroidal galaxy.