uvby - β photoelectric photometry of the open cluster α per

 

J. H. Peña¹ and J.-P. Sareyan²

 

¹ Instituto de Astronomía, UNAM, Apdo. Postal 70-264, México, D. F. México (jhpena@astroscu.unam.mx).

² Observatoire de la Côte d'Azur, 2130 Route de L'Observatoire, Caussols St. Vallier de Thiey, F-06460 France (Jean-Pierre.Sareyan@obspm.fr).

 

Received 2003 September 2
Accepted 2006 April 20

 

RESUMEN

Se han obtenido nuevas observaciones de estrellas en la dirección del cúmulo abierto α Per. Estas observaciones se han combinado con las de la literatura en el sistema uvby - β de Strömgren. A partir de ellas se ha determinado una membresía fotométrica que se ha comparado con la derivada de los estudios de movimientos propios y de Hipparcos. Se han determinado características físicas para las estrellas y para el cúmulo.

 

ABSTRACT

Absolute photoelectric photometry of stars in the direction of the Open Cluster α Per has been secured and is presented along with an analysis reinforced with all the available data in Strömgren uvby - β photometry compiled from the literature. Cluster membership is analyzed and the physical characteristics of the stars have been deduced. The membership determined in this paper is compared with that of proper motion studies and Hipparcos.

Key Words: OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL (α PER) - STARS: VARIABLES - TECHNIQUES: PHOTOMETRIC.

 

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Acknowledgements

Special thanks to the staff of the SPM Observatory who made the observations possible. J. Orta, E. Themsel, and J. Miller did typing and proofreading, respectively; C. Guzmán and A. Díaz assisted us at the computing. One of us, JPS, thanks the Instituto de Astronomía, UNAM for allotting the observing time. This project was partially supported by the CONACyT-CNRS agreement E130.2060 and Papiit IN100199. R. M. Garcia and T. Valdés have employed the material of this paper, independently, in their theses at UNAM. We are thankful to them and to L. Parrao for fruitful discussions and work. This research has made use of the Simbad databases operated at CDS, Strasbourg, France and NASA ADS Astronomy Query Form. The comments of an anonymous referee improved this paper.

 

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