Detalles de publicación

PP 017074

The open cluster King 1 in the second quadrant

R. Carrera (1,2), L. Rodríguez Espinosa (1,2), L. Casamiquela (3), L. Balaguer Nuñez (3), C. Jordi (3), C. Allende Prieto (1,2), P. B. Stetson (4)
(1) Instituto de Astrofísica de Canarias (2) Departamento de Astrofísica, Universidad de La Laguna (3) Departament de Física Quántica i Astrofísica, Institut Ciéncies Cosmos (ICCUB), Universitat de Barcelona (4) National Research Council
We analyse the poorly-studied open cluster King~1 in the second Galactic quadrant. From wide-field photometry we have studied the spatial distribution of this cluster. We determined that the centre of King~1 is located at $\alpha_{2000}=00^{\rm h}22^{\rm m}$ and $\delta_{2000}=+64\degr23\arcmin$. By parameterizing the stellar density with a King profile we have obtained a central density of $\rho_{0}=6.5\pm0.2$ star arcmin$^{-2}$ and a core radius of $r_{\rm core}=1\farcm9\pm0\farcm2$. By comparing the observed color-magnitude diagram of King~1 with those of similar open clusters and with different sets of isochrones, we have estimated an age of $2.8\pm0.3$ Gyr, a distance modulus of $(m-M)_{\rm o}=10.6\pm0.1$ mag, and a reddening of $E(B-V)=0.80\pm0.05$ mag. To complete our analysis we acquired medium resolution spectra for 189 stars in the area of King~1. From their derived radial velocities we determined an average velocity $\left\langle V_r\right\rangle $=-53.1$\pm$3.1 km s$^{-1}$. From the strength of the infrared \mbox{Ca\,{\sc ii}} lines in red giants we have determined an average metallicity of $\left\langle [M/H]\right\rangle$=+0.07$\pm$0.08 dex. From spectral synthesis we have also estimated an $\alpha$-elements abundance of $\left\langle [\alpha/M]\right\rangle$=-0.10$\pm$0.08 dex.

 
Aceptado para publicación en MNRAS | Enviado el 2017-07-15 | Proyecto 301204