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Hi
I think that is just an optical illusion brought on by relativity of brightness. You are quite right many stars are more visible at dusk than later in real darkness particularly the brightest ones. A lot depends on how dark your skies can get. However they are not brighter just easier to pick out because of the relative brightness of the sky at that time masking other less bright stars.
When I look at the stars in my local light polluted area I can pick out star patterns and easily identify the bright stars but when I go to a dark site I have greater difficulty in identifying the same stars in the clouds of other quite bright stars.
Barry
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