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Comprehensive Analysis of RGU Photometry in the Direction to M5

Published online by Cambridge University Press:  05 March 2013

S. Karaali ,
S. Bilir  and
R. Buser
S. Karaali*
Affiliation:
Istanbul University, Department of Astronomy and Space Sciences, 34452 University-Istanbul, Turkey
S. Bilir
Affiliation:
Istanbul University, Department of Astronomy and Space Sciences, 34452 University-Istanbul, Turkey
R. Buser
Affiliation:
Astronomisches Institut der Universität Basel, 4102 Binningen, Switzerland
*
CE-mail: karsa@istanbul.edu.tr
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Abstract

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The RGU-photographic investigation of an intermediate latitude field in the direction to the Galactic centre is presented. 164 extra-galactic objects, identified by comparison of Minnesota and Basel charts, are excluded from the program. Also, a region with size 0.104 square-degrees, contaminated by cluster (M5) stars and affected by background light of the bright star HD 136202 is omitted. Contrary to previous investigations, a reddening of E(B – V) = 0.046, corresponding to E(G – R) = 0.07 mag is adopted. The separation of dwarfs and evolved stars is carried out by an empirical method, already applied in some of our works. A new calibration for the metallicity determination is used for dwarfs, while the absolute magnitude determination for stars of all categories is performed using the procedures given in the literature. There is good agreement between the observed logarithmic space density histograms and the galactic model gradients. Also, the local luminosity function agrees with Gliese's (1969) and Hipparcos (Jahreiss & Wielen 1997) luminosity functions, for stars with 2 < M(G) ≤ 8 mag. For giants, we obtained two different local space densities from comparison with two Galactic models, i.e. D*(0) = 6.63, close to that of Gliese (1969), and D*(0) = 6.79. A metallicity gradient, d[Fe/H]/dz = –0.20 dex kpc–1, is detected for dwarfs (only) with absolute magnitudes 4 < M(G) ≤ 6, corresponding to a spectral type interval F5–K0.

Keywords

Galaxy: structureGalaxy: metallicity gradientStars: luminosity function
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 3 , 2004 , pp. 275 - 283
Copyright
Copyright © Astronomical Society of Australia 2004

References

Ak, S. G., Karaali, S., & Buser, R. 1998, A&AS, 131, 345 Google Scholar
Becker, W., Steinlin, U., & Wiedeman, D. 1978, Photometric catalogue for stars in selected areas and other fields in the RGU-system (V) (Basel: Astronomisches Institut)Google Scholar
Beers, T. C., & Sommer-Larsen, J. 1995, ApJS, 96, 175 CrossRefGoogle Scholar
Bilir, S., Karataşs, Y., & Ak, S. G. 2003, TJPh, 27, 235 Google Scholar
Buser, R. 1978, A&A, 62, 425 Google Scholar
Buser, R., & Fenkart, R. P. 1990, A&A, 239, 243 Google Scholar
Buser, R., & Rong, J. 1995, BaltA, 4, 1 Google Scholar
Buser, R., Rong, J., & Karaali, S. 1998, A&A, 331, 934 (BRK)Google Scholar
Buser, R., Rong, J., & Karaali, S. 1999, A&A, 348, 98 Google Scholar
Buser, R., Karataş, Y., Lejeune, Th., Rong, J. X., Westera, P., & Ak, S. G. 2000, A&A, 357, 988 Google Scholar
Carney, B. W. 1979, ApJ, 233, 211 CrossRefGoogle Scholar
Carney, B. W. 2000, Proceedings of the 35th Liége Int. Astrophys. Coll., July 5–8, 1999, p. 287 Google Scholar
Cayrel, de Strobel G., Soubiran, C., Friel, E. D., Ralite, N., & Francois, P. 1997, A&AS, 124, 299 Google Scholar
Chiba, M., & Yoshii, Y. 1998, AJ, 115, 168 CrossRefGoogle Scholar
Del Rio, G., & Fenkart, R. P. 1987, A&AS, 68, 397 Google Scholar
Fenkart, R. P., & Karaali, S. 1987, A&AS, 69, 33 Google Scholar
Fenkart, R. P., & Karaali, S. 1990, A&AS, 83, 481 Google Scholar
Gilmore, G., & Wyse, R. F. G. 1985, AJ, 90, 2015 (GW)CrossRefGoogle Scholar
Gliese, W. 1969, Veröff. Astron. Rechen Inst. Heidelberg No. 22Google Scholar
Güngör-Ak, S. 1995, Ph.D. Thesis (Istanbul: Istanbul University)Google Scholar
Jahreiss, H., & Wielen, R. 1997, in Hipparcos'97, eds. B. Battrick, M. A. C. Perryman, & P. L. Ernacca, ESA SP-402, Noordwyk, p. 675 (JW)Google Scholar
Karaali, S. 1992, VIII. Nat. Astron. Symp, eds. Z. Aslan, & O. Gölbaşᴉ, Ankara, p. 202 Google Scholar
Karaali, S. 1994, A&AS, 106, 107 Google Scholar
Karaali, S., Karataş, Y., Bilir, S., & Ak, S. G. 1997, IAU Abstract Book, Kyoto, p. 299 Google Scholar
Karaali, S., Karataş, Y., Bilir, S., Ak, S. G., & Gilmore, G. F. 2000, The Galactic Halo: from Globular Clusters to Field Stars. 35th Liége Intr. Astr. Coll., eds. A. Noel et al., p. 353 Google Scholar
Karaali, S., & Bilir, S. 2002, TJPh, 26, 427 Google Scholar
Karaali, S., Ak, S. G., Bilir, S., Karataş, Y., & Gilmore, G. 2003, MNRAS, 343, 1013 CrossRefGoogle Scholar
Karataş, Y., Karaali, S., & Buser, R. 2001, A&A, 373, 895 Google Scholar
Layden, A. C. 1995, AJ, 110, 2288 Google Scholar
Norris, J. E. 1996, ASP Conf. Ser. Vol. 92, eds. H. L. Morrison & A. Sarajedini, p. 14 Google Scholar
Reid, N., & Majewski, S. R. 1993, ApJ, 409, 635 CrossRefGoogle Scholar
Rodgers, A.W., & Roberts, W. H. 1993, AJ, 106, 1839 CrossRefGoogle Scholar
Rong, J., Buser, R., & Karaali, S. 2001, A&A, 365, 431 Google Scholar
Sandage, A. R. 1969, ApJ, 158, 1115 CrossRefGoogle Scholar
Schlegel, D. J., Finkbeiner, D. P., & Davis, M. 1998, ApJ, 500, 525 CrossRefGoogle Scholar
Wyse, R. F. G., & Gilmore, G. 1986, AJ, 91, 855 CrossRefGoogle Scholar