Plate 26: 63 Tau: A Classical Am Star

Star Index

Plate 26: 63 Tau: A Classical Am Star

We label “classical Am stars” those which have a difference between K–line type and metallic–line type greater than 0.5 spectral class. “The proto Am stars” are those having a smaller difference.

The spectrum of the Hyades star 63 Tau matches rather closely that of 20 CVn over wavelengths shorter than λ4200–except for the greatly weakened Ca II lines.

The line–pattern of 63 Tau at wavelengths longer than λ4290 resembles more closely that of the F3 V standard. The “normal” metallic–line type for the classical Am stars is determined over the spectral range λλ3850–4200.

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