IC 2395 y BH 47: un único cúmulo abierto en la constelación de Vela

CLARIA OLMEDO, JUAN JOSÉ; LAPASSET, EMILIO; PIATTI, ANDRÉS E.; AHUMADA, A.V.

La Plata

Congreso; Reunión Anual de la Asoc. Argentina de Astronomía; 2003

We report UBV photoelectric photometry for 273 stars in the fields of the open clusters IC 2395 and BH 47. Our postulate is that, rather than two different clusters in this region of Vela, there is only one, which we call IC 2395 = BH 47. The cluster is centered at about α = 8h 42m 33s, δ = -48o 06' 48'' (2000), its angular diameter being ˜ 19'. The analysis of the photometric data yields 61 probable cluster members and 16 possible members. The reddening across the cluster appears to be uniform, the mean E(B-V) value being 0.09 ± 0.02. The true distance modulus is V0-Mv = 9.52, corresponding to a distance from the Sun of 800 pc and 48 pc below the Galactic plane. The cluster age, determined by fitting isochrones with core overshooting, turns out to be (6 ± 2) Myr. There is a strong likelihood that IC 2395 = BH 47 is physically connected to the Vela OB1C association (Clariá et al. 2003, A&A, 409, 541).