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Colour Transformations between BVRc and gri′ Photometric Systems for Giant Stars

  • S. Ak (a1), T. Ak (a1), S. Karaali (a1), S. Bilir (a1), S. Tunçel Güçtekin (a1), Ö. Önal Taş (a1), N. D. Öztürkmen (a1), Ş. Duran (a1), B. Coşkunoǧlu (a1), T. Yontan (a1), E. Yaz Gökçe (a1) and Z. Eker (a2)...

Abstract

The transformation equations from BVRc to gri′ magnitudes and vice versa for the giants were established from a sample of 80 stars collected from Soubiran et al. (2010) with confirmed surface gravity (2 ⩽ logg (cm s− 2) ⩽ 3) at effective temperatures 4000 < Teff (K) < 16000. The photometric observations, all sample stars at gri′ and 65 of them at BVRc , were obtained at TÜBİTAK National Observatory (TUG) 1m (T100) telescope, on the Taurus Mountains in Turkey. The MV absolute magnitudes of the giant stars were estimated from the absolute magnitude-temperature data for the giant stars by Sung et al. (2013) using the Teff from the intrinsic colours considered in this study. The transformation equations could be considered to be valid through the ranges of the following magnitudes and colours involved: 7.10 < V 0 < 14.50, 7.30 < g0 < 14.85, − 0.20 < (BV)0 < 1.41, − 0.11 < (VRc )0 < 0.73, − 0.42 < (g′ − r′)0 < 1.15, and − 0.37 < (r′ − i′)0 < 0.47 mag. The transformations were successfully applied to the synthetic BVRc data of 427 field giants in order to obtain the gri′ magnitudes and colours. Comparisons of these data with the gri′ observations of giants in this study show that the mean residuals and standard deviations lie within [− 0.010, 0.042] and [0.028, 0.068] mag, respectively.

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References

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Colour Transformations between BVRc and gri′ Photometric Systems for Giant Stars

  • S. Ak (a1), T. Ak (a1), S. Karaali (a1), S. Bilir (a1), S. Tunçel Güçtekin (a1), Ö. Önal Taş (a1), N. D. Öztürkmen (a1), Ş. Duran (a1), B. Coşkunoǧlu (a1), T. Yontan (a1), E. Yaz Gökçe (a1) and Z. Eker (a2)...

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