The entire spectral classification of our Sun is what?
A.M5V
B.G2lB
C.K9lll
D.Not Given
D. (not given)
The sun is a G2V star.
To determine the spectral classification of our Sun, one can refer to the Harvard Spectral Classification system. This system categorizes stars based on their spectral characteristics, specifically the absorption lines observed in their spectra.
The spectral classification of stars is denoted by a letter (O, B, A, F, G, K, M) and a number (0-9) indicating the subtype within that letter class. The letter classification is based on the surface temperature, where O-type stars are the hottest and M-type stars are the coolest.
Additionally, stars may have a luminosity class designation, denoted by Roman numerals (I, II, III, IV, V). These luminosity classes describe the brightness and size of a star relative to other stars of the same spectral type.
In the case of our Sun, its spectral classification is G2V. The "G" indicates that it falls within the G-letter class, which corresponds to stars with a surface temperature between approximately 5,000 and 6,000 Kelvin. The number "2" indicates that it is a subtype within the G-class, specifically a G2 star. The "V" designation signifies the main sequence or dwarf star category, indicating that the Sun is in the prime of its life and fuses hydrogen in its core like other main sequence stars.
Therefore, the correct answer is D. (not given) since the options provided do not include the exact spectral classification of our Sun (G2V).