Abstract
We have studied the relatively recently discovered object 2-7-0122, with a V magnitude of 17m, and have confirmed that it is an SX Phe variable star. Our photometry at the 1.8 m telescope of the Boyhunsan Observatory and the 1.0 m telescope of the Mount Lemon Observatory has enabled us to refine the photometric elements and to perform a frequency analysis of the light curve. We demonstrate the presence of two close frequencies, f 1 = 24.6539 cycles/day and f 2 = 24.8173 cycles/day, one of them possibly non-radial, and of several combinational frequencies. The star’s metallicity is at least two orders of magnitude lower than that of the Sun, making the star the most metal-poor SX Phe object in the Galactic field. We confirm variability of another star in the field of view, and have determined its light elements and its possible variability type (RRc).
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
E. Rodríguez and M. J. López-González, Astron. Astrophys. 359, 597 (2000).
S.-Y. Jiang, S. Hyung, and K. M. Kim, in Detta Scuti and Related Stars, Ed. by M. Breger and M. H. Montgomery, Astron. Soc. Pac. Conf. Ser. 210, 572 (2000).
Y.-B. Jeon, S.-L. Kim, H. Lee, and M. G. Lee, Astron. J. 121, 2769 (2001).
N. N. Samus et al., Combined General Catalogue of Variable Stars, SIMBAD Catalogue II/250 (2004), ftp://cdsarc.u-strasbg.fr/pub/cats/II/250.
S.-L. Kim, J. W. Lee, C. Kim, et al., Publ. Astron. Soc. Pac. 117, 1394 (2005).
Y. Liu, S. Jiang, and M. Cao, Inform. Bull. Var. Stars 3606 (1991).
C. Kim, Y.-B. Jeon, and S.-L. Kim, Publ. Astron. Soc. Paci. 115, 755 (2003).
J. N. Fu, C. Sterken, and L. Barrera, in Spectroscopically and Spatially Resolving the Components of Close Binary Stars, Ed. by R. W. Hilditch, H. Hensberge, and K. Pavlovski, Astron. Soc. Pac. Conf. Ser. 318, 346 (2004).
D. H. McNamara, Publ. Astron. Soc. Pac. 109, 1221 (1997).
M. E. Everett, S. B. Howell, G. T. van Belle, and D. R. Ciardi, Publ. Astron. Soc. Pac. 114, 656 (2002).
P. B. Stetson, Publ. Astron. Soc. Pac. 99, 191 (1987).
P. Massey and L. E. Davis, A User’s Guide to Stellar CCD Photometry with IRAF (1992).
D. W. Kurtz and M. S. Cropper, Mon. Not. R. Astron. Soc. 228, 125 (1987).
Y. B. Jeon, M. G. Lee, S. L. Kim, and H. Lee, Astron. J. 128, 287 (2004).
P. Vanicek, Astrophys. Space Sci. 12, 10 (1971).
E. Antonello, P. Broglia, P. Conconi, and L. Mantegazza, Astron. Astrophys. 169, 122 (1986).
G. K. Andreasen, Astron. Astrophys. 186, 159 (1987).
D. H. McNamara, Astron. J. 109, 1751 (1995).
E. G. Hintz, M. D. Joner, D. H. McNamara, et al., Publ. Astron. Soc. Pac. 109, 15 (1997).
D. J. Schlegel, D. P. Finkbeiner, and D. Marc, Astrophys. J. 500, 525 (1998).
D. H. McNamara and K. G. Budge, Publ. Astron. Soc. Pac. 97, 322 (1985).
R. Buser and R. L. Kurucz, Astron. Astrophys. 70, 555 (1978).
A. Olech, W. A. Dziembovski, A. A. Pamyatnykh, et al., Mon. Not. R. Astron. Soc. 363, 40 (2005).
Author information
Authors and Affiliations
Additional information
Original Russian Text © C. Kim, J.-B. Jeon, S.-L. Kim, A. V. Yushchenko, 2007, published in Astronomicheskiĭ Zhurnal, 2007, Vol. 84, No. 8, pp. 695–713.
Rights and permissions
About this article
Cite this article
Kim, C., Jeon, J.B., Kim, S.L. et al. Photometric study of an SX Phoenicis variable in the galactic halo. Astron. Rep. 51, 624–641 (2007). https://doi.org/10.1134/S1063772907080033
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/S1063772907080033