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27 April 2024 |
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On the newly discovered Canes Venatici II dSph galaxy | | C. Greco
; M. Dall'Ora
; G. Clementini
; V. Ripepi
; L. Di Fabrizio
; K. Kinemuchi
; M. Marconi
; I. Musella
; H. A. Smith
; C. T. Rodgers
; C. Kuehn
; T. C. Beers
; M. Catelan
; B. J. Pritzl
; | | Date: |
13 Dec 2007 | | 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 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, <V> = 21.48 +/- 0.02
mag, is used to obtain a precision distance modulus of mu_0 = 21.02 +/- 0.06
mag and a corresponding distance of 160(+4,-5} kpc, for an adopted reddening
E(B-V) = 0.015 mag. | | Source: | arXiv, 0712.2241 | | Services: | Forum | Review | PDF | Favorites | |
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