Je was op zoek naar: spektroskopsko (Sloveens - Engels)

med drugim je odkril, da je kastor b spektroskopsko dvozvezdje s periodo 2,92 dni.
16 (1888), p.17===obituaries===* apj 80 (1934) 81* mnras 95 (1935) 338* obs 57 (1934) 204

leta 1960 so meter na novo spektroskopsko definirali, ångström pa je bil definiran točno 0,1 nanometra.
bradley was elected a fellow of the royal society on 6 november 1718.

v celoti pa so jo zavrgli, ko so spektroskopsko ugotovili, da galaksije vseh oblik sestavljajo zvezde.
berlin: akademie-verlag, 1980.

kasneje se je pokazalo da črte izvirajo od helija, plina, ki sta ga leta 1868 neodvisno spektroskopsko odkrila janssen in lockyer.
a few (roughly 10%) of the central stars of planetary nebulae are, despite their much lower (typically ~0.6 solar) masses, also observationally of the wr-type; i.e., they show emission line spectra with broad lines from helium, carbon and oxygen.