Authors : Sayak Biswas

Volume/Issue : Volume 10 - 2025, Issue 9 - September

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DOI : https://doi.org/10.38124/ijisrt/25sep1452

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Abstract : we present a comparative analysis of two photometric calibration methods which is used to calculate the effective temperature and the uncertainties of 109 stars present in both Hipparcos and Gaia Dr3 catalogue .Stellar effective temperature were computed with (i) the color-temperature relation of Flower(1996)[5],which only uses B-V,and (ii)Casagrande(2010)[6] calibration that incorporates [Fe/H]. Values of B-V were taken from Hipparcos[3] and its input uncertainties were prop- agated through independent Monte Carlo [4] sampling(For input uncertainties of [Fe/H] their DR3 percentiles were converted to equivalent 1 sigma error which were propagated).(Gaia Dr3[2] effective temperature and uncertainties taken as refer- ence) by examining systematic offsets,scatter,the behaviour of normalised residuals and by testing how differences depends on metalicity.We must note that B-V used here are undereddened nor systematic correction was used to rectify either of the calibrations and Gaia itself has systematic uncertainties.

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