Table of Contents
What spectral class is G2V?
Spectral standard stars
| Spectral type | Mass ( M ☉) | Color index (B − V) |
|---|---|---|
| G2V | 1.00 | 0.65 |
| G3V | 0.99 | 0.66 |
| G4V | 0.985 | 0.67 |
| G5V | 0.98 | 0.68 |
What color are G2V stars?
Sun. … Sun is classified as a G2 V star, with G2 standing for the second hottest stars of the yellow G class—of surface temperature about 5,800 kelvins (K)—and the V representing a main sequence, or dwarf, star, the typical star for this temperature class. (G stars are so called because of…
What color are spectral a class stars?
Stellar Spectral Types
| Temperature | ||
|---|---|---|
| B | 10,000 – 30,000 K | Blue-white stars |
| A | 7,500 – 10,000 K | White stars |
| F | 6,000 – 7,500 K | Yellow-white stars |
| G | 5,000 – 6,000 K | Yellow stars (like the Sun) |
What luminosity class is our G2V sun?
The Sun is an example of a main sequence star, of spectroscopic type G2. Therefore, the combined color and luminosity class for the Sun is G2V (the same as alpha Centauri)….
| Luminosity Classes | ||
|---|---|---|
| V | Main Sequence | Vega (A0V) |
What is a Class 6 star?
Sub-dwarf classes have also been used: VI for sub-dwarfs (stars slightly less luminous than the main sequence).
Why is sun called yellow dwarf?
According to their system of classification, the Sun is known as a yellow dwarf star. Stars in the this classification have a surface temperature between 5,300 and 6,000 K, and fuse hydrogen into helium to generate their light.
What spectral class of stars is the coolest?
The spectral sequence is also a colour sequence: the O- and B-type stars are intrinsically the bluest and hottest; the M-, R-, N-, and S-type stars are the reddest and coolest.
Are there systematic differences in spectral classifications of G2V stars?
Given that stars spectrally classified as “G2V” typically have astrophysical stellar properties very similar to that of the Sun, it is worth investigating whether there are systematic differences in classification between investigators.
Which is the anchor of the G2V spectrum?
The Sun is the G2V “anchor” standard according Garrison (1994), i.e. its disk-averaged spectrum provides one of the immovable spectral types that provides the backbone of the MK spectral classification system going back to the 1950s. Unfortunately the MKK 1943 atlas did not explicitly list a G2V standard.
Can a G2V star be classified on the MK system?
To wit: a G2V in one survey is not necessarily a G2V in another survey, and when we say a star has been classified “on the MK system”, one needs to be clear about which standards one has used.
How big is a G-type main sequence star?
A G-type main-sequence star (Spectral type: G-V), often called a Red-orange-yellow star, or G star, is a main-sequence star (luminosity class V) of spectral type G. Such a star has about 0.84 to 1.15 solar masses and surface temperature of between 5,300 and 6,000 K., Tables VII, VIII.