spectral type


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Related to spectral type: Luminosity class

spectral type

[′spek·trəl ‚tīp]
(astronomy)
A label used to indicate the physical and chemical characteristics of a star as indicated by study of the star's spectra; for example, the stars in the spectral type known as class B are blue-white, and are referred to as helium stars because the dominant lines in their spectra are the lines in helium spectra.
References in periodicals archive ?
From the final value of T1, assuming the primary is main-sequence, the mass, effective temperature and spectral type of the primary were derived; then q gave those parameters for the secondary.
My students have also participated in comparing results of similar spectral type stars or of normal and peculiar stars with similar effective temperatures (e.
2-35 [micro]m spectral coverage a possibility for at least one bright archetype of each spectral type.
Moreover, an orange or red giant star appears redder than a dwarf with the same spectral type.
W Ursae Majoris stars are members of a class of eclipsing variable stars in which the components are of spectral type late A to mid K; though a recent discovery of Koen and Ishihara (2006) suggest a unique contact binary of spectral type "later" than M4.
All these values suggest a spectral type near F0 if the star is unreddened, however, to give the observed V magnitude a main sequence star of this spectral type would lie at a distance of some 1500 parsecs.
Other hot stars of spectral type O and B in the association, which is estimated to have a remarkably young age of only about 1 million years, include Omicron ([omicron]), Xi ([xi]), 40, X, and AG Persei.
They are presently situated close to the ZAMS on the HR diagram, are of spectral type B--F, and are at a slow mass accretion (SMA) stage in their evolution.
In the case of NGC 40 the central star is a high temperature object with a spectral type of WC 8, so it is likely that this is a high density object.
The document issued by the notary public declares Duran to be the "owner of the Sun, a star of spectral type G2, located in the center of the solar system, located at an average distance from Earth of about 149,600,000 kilometers.
Sirius A is spectral type A, and around two solar masses.
Antares is a red supergiant, spectral type Ml, located 550 light years away and about 700 times the diameter of the Sun.