Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5105m&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #51.05; Bulletin of the American Astronomical Society, Vol. 26, p.1395
Astronomy and Astrophysics
Astronomy
Scientific paper
Our {Hubble Space Telescope} Cycle 4 program Stellar Populations of the Leo II Dwarf Spheroidal Galaxy (GO 5386) used the Wide Field and Planetary Camera 2 on 15 May 1994 to do deep imaging of Leo II with 4800 second exposures in both the F555W (broad-band V) and F814W (broad-band I) filters. This observation has a limiting magnitude of V~27 mag. The main-sequence turnoff is at V~24.2 mag which suggests that star formation in Leo II probably ended about 7 Gyr (10(9) years) ago. The color-magnitude digram exhibits a complex morphology around the main-sequence turnoff region which implies that Leo II probably had a long and complex history of star formation. One surprising discovery of this space-based observation is that Leo II has a large Blue Straggler population.
Mighell Kenneth J.
Rich Robert Michael
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