| Title | On the Newly Discovered Canes Venatici II dSph Galaxy |
| Authors | Greco, Claudia; Dall'Ora, Massimo; Clementini, Gisella; Ripepi, Vincenzo; Di Fabrizio, Luca; Kinemuchi, Karen; Marconi, Marcella; Musella, Ilaria; Smith, Horace A.; Rodgers, Christopher T.; Kuehn, Charles; Beers, Timothy C.; Catelan, Márcio; Pritzl, Barton J. |
| Bibcode | 2008ApJ...675L..73G Search ADS ↗ |
| Abstract | 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 turnoff 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 Pab = 0.743 days, and a first-overtone (RRc) RR Lyrae star with Pc = 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, langle Vrangle = 21.48 +/- 0.02 mag, is used to obtain a precision distance modulus of μ0 = 21.02 +/- 0.06 mag and a corresponding distance of 160+ 4-5 kpc, for an adopted reddening E(B - V) = 0.015 mag. Based on data collected at the 4.2 m William Herschel Telescope at Roche de los Muchachos, Canary Islands, Spain, and at the 2.3 m telescope at the Wyoming Infrared Observatory (WIRO) at Mt. Jelm, Wyoming. |
| Objects | 1 Objects Search NED ↙ |
