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Alnitak ζ Ori and Mintaka δ Ori

Alnitak O9.7Ib+B0III
Mintaka B0III+O9V

http://simbad.u-strasbg.fr/simbad/sim-id?Ident=alnitak
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=mintaka
https://astrojolo.com/more-than-pictures/alnitak-and-mintaka-spectra/

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θ1 Ori C

Theta 01 Orionis C  O7Vp

http://simbad.u-strasbg.fr/simbad/sim-id?Ident=tet01+Ori+C

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Menkib ξ Per

Menkib ksi Persei O7.5III(n)((f)) C
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=menkib

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Algol β Per

Algol bet Persei B8V C
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=beta+per 

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Melotte 15

HD15558 O4.5III(f) C
BD+60 501 O7V(n)((f))z C
BD+60 505 A1IV/V C
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD15558
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B60+501
http://simbad.u-strasbg.fr/simbad/sim-id?Ident=BD%2B60+505
https://astrojolo.com/more-than-pictures/hd15558-the-most-massive-star-in-the-milky-way/

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M45 Pleiades

https://astrojolo.com/spectroscopy/pleiades-spectra/

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Electra 17 Tau

Electra 17 Tau  B6IIIe 
 http://simbad.u-strasbg.fr/simbad/sim-id?Ident=17+tau