Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-13
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ Letters
Scientific paper
10.1086/533585
We report on the detection of variable stars in the Canes Venatici II (CVn II) dwarf spheroidal galaxy, a new satellite of the Milky Way recently discovered by the Sloan Digital Sky Survey. We also present a V, B-V color-magnitude diagram that reaches V = 25.5 mag, showing the galaxy's main sequence turn off at V = 24.5 mag and revealing several candidate blue straggler stars. Two RR Lyrae stars have been identified within the half-light radius of CVn II,a fundamental-mode variable (RRab) with period P_ab = 0.743 days, and a first-overtone (RRc) RR Lyrae star with P_c = 0.358 days. The rather long periods of these variables along with their position on the period-amplitude diagram support an Oosterhoff type II classification for CVn II. The average apparent magnitude of the RR Lyrae stars,
Beers Timothy C.
Catelan Márcio
Clementini Gisella
Dall'Ora Massimo
Fabrizio L. Di
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