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Jeff,
According to VSpec, Alpha Grus is a B7iv.
If I work on your spectra, the deepest absorption feature appears to be Hbeta, this then gives the series of Hgama, delta, epsilon towards the UV.
The "dip" around the 4500A, between Hbeta/Hgama I think may be a CIII feature(?) This calibration then shows the slight dip of Ha.
What do the others think???
If we agree, it would be good to post a data file with the graph(s); this allows others to run the actual spectra through VSpec.....what do you think??
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