What are the three types of stellar spectra?
What are the three types of stellar spectra?
a continuous spectrum or continuum; the emission of a thermal spectrum is one type of continuum. an absorption spectrum or sometimes an absorption-line spectrum. an emission spectrum or emission-line spectrum.
What is the stellar spectrum?
A star’s spectrum contains information about its temperature, chemical composition, and intrinsic luminosity. Spectrograms secured with a slit spectrograph consist of a sequence of images of the slit in the light of the star at successive wavelengths.
Which star category is the hottest?
O-
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.
Which stellar type is brightest?
For these stars, the hotter they are, the brighter they are. The sun is a typical Main Sequence star. Dwarf stars are relatively small stars, up to 20 times larger than our sun and up to 20,000 times brighter. Our sun is a dwarf star….
| TYPE | Star |
|---|---|
| V | Main sequence stars (dwarf stars) |
| VI | Subdwarf |
| VII | White Dwarf |
Why is stellar spectroscopy important?
The science of spectroscopy is quite sophisticated. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.
What class is the sun?
class G star
The Sun is a class G star; these are yellow, with surface temperatures of 5,000–6,000 K. Class K stars are yellow to orange, at about 3,500–5,000 K, and M stars are red, at about 3,000 K, with titanium oxide prominent in their spectra.
Why are spectra of stars different?
The primary reason that stellar spectra look different is because the stars have different temperatures. Most stars have nearly the same composition as the Sun, with only a few exceptions. Hydrogen, for example, is by far the most abundant element in most stars.
What are the 3 biggest stars?
The three biggest stars are KW Sagitarii (distance 9,800 light-years), V354 Cephei (distance 9,000 light-years), and KY Cygni (distance 5,200 light-years), all with radii about 1500 times that of the Sun, or about 7 astronomical units (AU).