LSJ
[ᾱ] i.e. ἤραο, Ep. for ἤρω, 2 sg. aor.1 Med. of αἴρω, Od. 24.33. contr. fr. ἦ ἄρα in dialects other than Att., as Sappho 102, Alc. 94, Alcm. 61, Pi. P. 9.37, B. 5.165, Sophr. 1 D., Hp. Prorrh. 1.117, 120, 121 (ἆρα ibid.), Herod. 4.21, 5.14, Call. Fr. 1.51 P., cf. A.D. Conj. 223.25.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)