The "stars" here are evidently angels (compare Job 38:7). Although Lucifer had a throne as God's "anointed cherub" (Ezekiel 28:14), he aspired to reign over all God's holy angels, all of whom have been created to serve God and to become ministers to those who would be "heirs of salvation" (Hebrews 1:14).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8