The unusually low metallicity of Vega makes it a weak Lambda Boötis film y?ld?z?.[78][79] However, the reason for the existence of such chemically peculiar, spectral class A0–F0 stars remains unclear. One possibility is that the chemical peculiarity may be the result of diffusion or mass loss, although stellar models show that this would normall

Thus, for many years, Vega was used birli a baseline for the calibration of absolute photometric brightness scales.[46] However, this is no longer the case, bey the apparent magnitude zero point is now commonly defined in terms of a particular numerically specified flux. This approach is more convenient for astronomers, since Vega is derece always

Thus, for many years, Vega was used as a baseline for the calibration of absolute photometric brightness scales.[46] However, this is no longer the case, as the apparent magnitude zero point is now commonly defined in terms of a particular numerically specified flux. This approach is more convenient for astronomers, since Vega is not always availab

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