peculiar star Comparison Table

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peculiar star comparison table

Subject has surface temperature has rotation velocity is a kind of has absorption line has emission line has spectral type has definition has lifetime has color has relative abundance

Am star 10000 K A star H I O, B, A, and early F A-type or F-type object to which no unique spectral type can be assigned. Usually the classifier provides a classification according to the hydrogen, metallic and calcium lines. Also call metallic-line stars. white

Ap star 10000 K A star H I O, B, A, and early F Peculiar A-type stars ("magnetic" A stars) that show abnormally strong lines, sometimes of varying intensity, of certain ionized metals. Recent evidence indicates that all Ap stars are slow rotators compared with normal A stars. white

Bp star 11000 to 28000 K B star He I O, B, A, and early F Peculiar B stars whose spectra show a deficiency in helium and in which the lines of one or several elements are abnormally enhanced. Traditionally the most important subgroups are Si λ4200, Hg-Mn and Cr-Eu-Sr stars. The latest objects of the latter group correspond to early F-type. blue-white

Of star 35000 K very high peculiar star He II 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. 3 to 6 million years blue-white rare

Subject	has surface temperature	has rotation velocity	is a kind of	has absorption line	has emission line	has spectral type	has definition	has lifetime	has color	has relative abundance
Am star	10000 K		A star	H I		O, B, A, and early F	A-type or F-type object to which no unique spectral type can be assigned. Usually the classifier provides a classification according to the hydrogen, metallic and calcium lines. Also call metallic-line stars.		white
Ap star	10000 K		A star	H I		O, B, A, and early F	Peculiar A-type stars ("magnetic" A stars) that show abnormally strong lines, sometimes of varying intensity, of certain ionized metals. Recent evidence indicates that all Ap stars are slow rotators compared with normal A stars.		white
Bp star	11000 to 28000 K		B star	He I		O, B, A, and early F	Peculiar B stars whose spectra show a deficiency in helium and in which the lines of one or several elements are abnormally enhanced. Traditionally the most important subgroups are Si λ4200, Hg-Mn and Cr-Eu-Sr stars. The latest objects of the latter group correspond to early F-type.		blue-white
Of star	35000 K	very high	peculiar star	He II	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.	3 to 6 million years	blue-white	rare

Next early star: runaway star Up: early star Previous early star: O star