uvbyβ Photometry of the RR lyrae star AT And

 

J. H. Peña and R. Peniche¹

 

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

 

Received 2003 June 6
Accepted 2004 March 17.

 

ABSTRACT

Strömgren uvbyβ photoelectric photometry of the variable star AT And is presented. Analysis of this data corroborates the periods compiled by Kholopov (1985). Strömgren photometry has been used for the determination of reddening e and the physical parameters log g and log T_e, as well as the metallicity [Fe/H]. The determination of M_V is discussed assuming AT And is an RR Lyrae star.

Key Words: Photometry — Stars: Variables (RR Lyrae).

 

RESUMEN

Se presenta fotometría Strömgren uvby de la estrella AT And. Del análisis de estos datos se corrobora la constancia del período compilado por Kholopov (1985). La fotometría de Strömgren se ha utilizado para la determinación del enrojecimiento y de los parámetros físicos log g y log T_e así como la metalicidad [Fe/H]. Se discute la determinación de M_V considerando a AT And como una estrella del tipo RR de Lira.

 

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ACKNOWLEDGEMENTS

We would like to thank the assistance of the staff of the OAN who made the observations possible. J. Miller did the proofreading. A. Diaz, and C. Guzman assisted at the computer. Recognition is gratefully given to L. Parrao for fruitful discussions. This work was partially supported by the following sources: Papiit IN100199 and IN110102.

JHP thanks DGAPA for the funds provided for a sabbatical leave and Drs. J. C. Valtier and J. M. leContel and the Observatoire de la Cote d'Azur for their hospitality while this work was conceived.

 

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Notas

¹ Deceased