[vsnet-chat 3518] Some questions regarding 3 Pup

Hi, folks:

Does anyone know some transformation formula to convert R-I magnitudes to B-V? I guess it's not possible but I've got nothing to lose...

I would like to know if a 0.24 R magnitudes variation in an A2 star can have a V- variability counterpart.

This is for the case of 3 Pup (NSV 17577), a V=3.96 star with A2Iabe spectral type.

By the way, IBVS#2950 gives A3q as its spectrum.

What does the "q" mean? Is it anything to do with P Cygni profiles in the spectra?

Thanks,

Sebastian.

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