spectral type

Also found in: Encyclopedia, Wikipedia.
Related to spectral type: Luminosity class

spectral type


spectral class

(Astronomy) any of various groups into which stars are classified according to characteristic spectral lines and bands. The most important classification (Harvard classification) has a series of classes O, B, A, F, G, K, M, the series also being a scale of diminishing surface temperature

spec′tral type′

a category for classifying a star according to features of its spectrum that indicate its surface temperature and chemical composition.
References in periodicals archive ?
December 1967 Potassium Flares "HD 117,043 is a rather ordinary dwarf star of spectral type G6.
Tauri star RY Tau, the spatial distribution of early spectral type magnetic stars, the effect of high excitement level on the hydrogen ionization and recombination rates, detecting low-amplitude photometric variability in magnetic white dwarfs, and prototyping a moderate-resolution holographic spectrograph.
A solar twin should have a temperature, mass, and spectral type similar to our Sun.
Furthermore, during this period of less than three minutes the star underwent an abrupt change from spectral type M to B; in other words, it went from a temperature of 2,800 kelvin (K) to six or seven times more than that," he stated.
315 derived from 2MASS (see remarks about Table 2, above) indicate a blended spectral type of around F2 and temperature ~7000 K.
005 Program star details STAR UV Grus SPECTRAL TYPE N/A RA Dec GSC 2MASS SV (2000) (2000) B 22 19 53.
I picked these based on the experience of other astronomers and knowledge of the variability with stellar spectral type.
However, as noted by Koen, its reported spectral type A2 is late for a SPB.
The second half of the report deals with the progress that has already been made towards the resolution of the problem of calibration, particularly the studies aimed at obtaining an initial list of normal stars with reliable spectral type and good visible photometry and that have a high density on the sky.
The June-July 2016 conference in Prague continued the study of stars with spectral type B and forbidden emission lines in its spectrum--B[e] stars--and related phenomena.
This term generally refers to dwarf stars with a spectral type ranging from K5V to M5V.
Its spectral type is a run-of-the-mill M1 or M2, but we see its light severely reddened--and dimmed about 2 magnitudes--by both circumstellar and interstellar dust.