Lingå 11: an unstudied open cluster in the inner Galactic disk

Abstract

The field of the open cluster Lynga 11 is investigated by means of CCD BVI_KC photometry. This previously unstudied object appears to be rich, highly absorbed, moderately young and probably of solar metallicity. An angular radius of 4.5´ +/- 0.5´ is estimated from star counts in the cluster field. Adopting the theoretical metal content Z = 0.02, which provides the best global fit, we derive an age of (630 + 70) Myr. Simultaneously, colour excesses E(B-V) = 0.70 and E(V-I) = 0.85 and an apparent distance modulus V-Mv = 14.0 are obtained. These results place Lynga 11 at a distance of (2.3 + 0.5) kpc from the Sun and 6.5 kpc from the Galactic centre. The properties of a sample of clusters aligned along the line-of-sight of Lynga 11 are examined as well.

Usando fotometrıa CCD BVIKC se investiga la region del cumulo abierto Lyng˚a 11. Este objeto previamente no estudiado resulta ser un cumulo rico, altamente absorbido, moderadamente joven y probablemente de metalicidad solar. A partir de recuentos estelares en la region del cumulo se estima un radio angular de 4.5’ ± 0.5’. El mejor ajuste global de is´ocronas teoricas obtenido con Z = 0.02 implica una edad de (630 ± 70)x106 anos. ˜ Simultaneamente, resultan los siguientes valores: E(B-V) = 0.70, E(V-I) = 0.85 y V-MV = 14.0. Estos resultados ubican a Lynga 11 a una distancia de 2.3 ± 0.5 kpc del Sol y ∼ 6.5 kpc del centro Galactico. Se examinan adem´as las propiedades de una muestra de cumulos ubicados en la misma direcci´on que Lyng˚a 11.