3D hydrodynamical simulations of stellar photospheres with the CO5BOLD code: photometric colors of a late-type giant

2009/10/18 by A. Kučinskas, H.‐G. Ludwig, Kucinskas, A. +5
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.0910.3412

openalex publication_date 2009/10/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present synthetic broad-band photometric colors of a late-type giant located close to the RGB tip (T_eff = 3640 K, log g = 1.0 and [M/H] = 0.0). Johnson-Cousins-Glass BVRIJHK colors were obtained from the spectral energy distributions calculated using 3D hydrodynamical and 1D classical stellar atmosphere models. The differences between photometric magnitudes and colors predicted by the two types of models are significant, especially at optical wavelengths where they may reach, e.g., ΔV~0.16, ΔR~0.13 and Δ(V-I)~0.14, Δ(V-K)~0.20. Differences in the near-infrared are smaller but still non-negligible (e.g., ΔK~0.04). Such discrepancies may lead to noticeably different photometric parameters when these are inferred from photometry (e.g., effective temperature will change by ΔT_eff~60 K due to difference of Δ(V-K)~0.20).

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