O star Comparison Table

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O star comparison table

Subject has right ascension has declination has spectral type is part of is an instance of has V magnitude has rotational velocity has been observ has symbol has B-V magnitude has distance has abundance is usually part of is a kind of has apparent magnitude has emission line has synonym has definition has luminosity class has number of star

AE Aurigae O9.5 V Auriga dwarf d main sequence star Runaway star which diverges from a comparatively small area in Orion. V

Mintaka O9.5II Orion bright giant One of the three stars in Orion's belt, and the star along whose line of sight interstellar gas was first spectroscopically detected. II

O((f)) O star N III O-type stars in which N III is present in emission and He is strong in absorption.

O(f) O star N III and sometimes He II O-type stars in which N III is present in emission and He II is weakly present in absorption or emission.

Oe O star Balmer lines O star with emissions in the Balmer lines.

Oef O star He II λ4686 (double) Early O stars that show double emission lines in He II λ4686.

Of star peculiar star N III 4634-4641 and He II 4686 Peculiar O stars in which emission features at λλ4634-4641 from N III and 4686 from He II are present. They have a well-developed absorption spectrum, which implies that the excitation mechanism of the emission lines is selective, unlike that of Wolf-Rayet stars. The spectra of Of stars are usually variable, and the intensities of their emission lines vary in an irregular manner. Of stars belong to extreme Population I. All O stars earlier than 05 are Of.

Plaskett's star O, B, A, and early F Monoceros spectroscopic binary half the stars in the solar neighborhood are members of star systems HD 47129 A very massive O-type giant with known anomalies in its spectrum. It is a spectroscopic binary in which mass exchange is occurring. Its spectrum can be interpreted to mean that each component has a mass of 75 M_sun. III 2

sdO sd subdwarf Subdwarf O star showing few very broad and shallow Balmer lines and a very strong He II 4686 line. VI

Theta2 Orionis O9.5 Vp Orion dwarf d half the stars in the solar neighborhood are members of star systems 2U 0525-06 A spectroscopic binary tentatively identified with 2U 0525-06. V 2

Zeta Ophiuchi O9.5 V Ophiuchus dwarf 396 km s^-1 d 170 pc main sequence star A reddened O star (a runaway star from the Sco-Cen association) with a high rotational velocity. It is well known for its strong interstellar absorption lines in the visible part of the spectrum. V

Zeta Pup O4f Puppis O star The brightest Of star known, embedded in the Gum Nebula. It has an envelope which is rapidly accelerating outward.

Zeta Puppis 8 3 35.0 -40 0 11 O5Iaf Milky Way naked eye star 2.25 for many centuries -0.26 asterism brighter than 5 HR 3165 I

Next early star: peculiar star Up: early star Previous early star: luminous blue variable

Subject	has right ascension	has declination	has spectral type	is part of	is an instance of	has V magnitude	has rotational velocity	has been observ	has symbol	has B-V magnitude	has distance	has abundance	is usually part of	is a kind of	has apparent magnitude	has emission line	has synonym	has definition	has luminosity class	has number of star
AE Aurigae			O9.5 V	Auriga	dwarf				d								main sequence star	Runaway star which diverges from a comparatively small area in Orion.	V
Mintaka			O9.5II	Orion	bright giant													One of the three stars in Orion's belt, and the star along whose line of sight interstellar gas was first spectroscopically detected.	II
O((f))														O star		N III		O-type stars in which N III is present in emission and He is strong in absorption.
O(f)														O star		N III and sometimes He II		O-type stars in which N III is present in emission and He II is weakly present in absorption or emission.
Oe														O star		Balmer lines		O star with emissions in the Balmer lines.
Oef														O star		He II λ4686 (double)		Early O stars that show double emission lines in He II λ4686.
Of star														peculiar star		N III 4634-4641 and He II 4686		Peculiar O stars in which emission features at λλ4634-4641 from N III and 4686 from He II are present. They have a well-developed absorption spectrum, which implies that the excitation mechanism of the emission lines is selective, unlike that of Wolf-Rayet stars. The spectra of Of stars are usually variable, and the intensities of their emission lines vary in an irregular manner. Of stars belong to extreme Population I. All O stars earlier than 05 are Of.
Plaskett's star			O, B, A, and early F	Monoceros	spectroscopic binary							half the stars in the solar neighborhood are members of star systems					HD 47129	A very massive O-type giant with known anomalies in its spectrum. It is a spectroscopic binary in which mass exchange is occurring. Its spectrum can be interpreted to mean that each component has a mass of 75 M_sun.	III	2
sdO									sd					subdwarf				Subdwarf O star showing few very broad and shallow Balmer lines and a very strong He II 4686 line.	VI
Theta2 Orionis			O9.5 Vp	Orion	dwarf				d			half the stars in the solar neighborhood are members of star systems					2U 0525-06	A spectroscopic binary tentatively identified with 2U 0525-06.	V	2
Zeta Ophiuchi			O9.5 V	Ophiuchus	dwarf		396 km s^-1		d		170 pc						main sequence star	A reddened O star (a runaway star from the Sco-Cen association) with a high rotational velocity. It is well known for its strong interstellar absorption lines in the visible part of the spectrum.	V
Zeta Pup			O4f	Puppis	O star													The brightest Of star known, embedded in the Gum Nebula. It has an envelope which is rapidly accelerating outward.
Zeta Puppis	8 3 35.0	-40 0 11	O5Iaf	Milky Way	naked eye star	2.25		for many centuries		-0.26			asterism		brighter than 5		HR 3165		I