Lyngå 1, A Small Open Cluster Containing a Red-Supergiant Member

R.A.VÁZQUEZ; E.E. GIORGI; M.A.BRUSASCO; G.BAUME; G.R. SOLIVELLA

REVISTA MEXICANA DE ASTRONOMíA Y ASTROFíSICA

UNIV NACIONAL AUTONOMA MEXICO

Año: 2003 p. 89 - 105

0185-1101

We present CCD {UBV}RI} (Cousins system) photometric observations complemented with spectroscopic and polarimetric observations that were carried out in the open cluster Lyngå 1. Our data indicate that the cluster reddening is E(B-V)= 0.45+/-0.03, the ratio A[V]/E(B-V)= R suggests that the extinction law may be slightly anomalous ( R ≈ 3.5) and that the cluster distance modulus is V0 - M[V] = 11.40+/-0.2. The age of Lyngå 1 is between 100 and 125 Myr according to a fitting of theoretical isochrones, and the slope of its mass spectrum is x ≈ 1.7. The brightest red star in the field is a cluster member of spectral type K2 II-Ib.