| Title | Variable Stars in the Newly Discovered Milky Way Dwarf Spheroidal Satellite Canes Venatici I |
| Authors | Kuehn, Charles; Kinemuchi, Karen; Ripepi, Vincenzo; Clementini, Gisella; Dall'Ora, Massimo; Di Fabrizio, Luca; Rodgers, Christopher T.; Greco, Claudia; Marconi, Marcella; Musella, Ilaria; Smith, Horace A.; Catelan, Márcio; Beers, Timothy C.; Pritzl, Barton J. |
| Bibcode | 2008ApJ...674L..81K Search ADS ↗ |
| Abstract | We have identified 23 RR Lyrae stars and three possible anomalous Cepheids (ACs) among 84 candidate variables in the recently discovered Canes Venatici I (CVn I) dwarf spheroidal galaxy. The mean period of 18 RRab type stars, langle Pabrangle = 0.60 +/- 0.01 days, and the location of these stars in the period-amplitude diagram suggest that CVn I is likely an Oosterhoff-intermediate system. The average apparent magnitude of the RR Lyrae stars, langle Vrangle = 22.17 +/- 0.02 mag, gives a distance of 210+ 7-5 kpc, for an adopted reddening E(B - V) = 0.03 mag. We present a B, V color-magnitude diagram (CMD) of CVn I that reaches V ~ 25 mag, and shows that the galaxy has a mainly old stellar population with a metal abundance near [Fe/H] = -2.0 dex. The width of the red giant branch and the location of the candidate ACs on the CMD may indicate that the galaxy hosts a complex stellar population with stars from ~13 Gyr to as young as ~0.6 Gyr. Based on data collected at the 2.3 m telescope at the Wyoming Infrared Observatory (WIRO) at Mount Jelm, Wyoming, USA, and at the 4.2 m William Herschel Telescope, at Roche de los Muchachos, Canary Islands, Spain. |
| Objects | 1 Objects Search NED ↙ |
