On the H-R Diagram how were the letters for spectrul class chosen?

Subject: On the H-R Diagram how were the letters for spectrul class chosen?

Date: Thu Dec 3 21:14:28 1998
Posted by joan c. wafer
Grade level: 7-9
School: bennettsville middle school
City: bennettsville State/Province: s.c.
Country: usa
Area of science: Astronomy
ID: 912741268.As

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Re: On the H-R Diagram how were the letters for spectrul class chosen?

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