If a star looks red, that means its surface temperature is approximately 2,500 Kelvin. Just for comparison, our Sun, which actually looks white from space, measures about 6,000 Kelvin. The hotter the star, the further up the spectrum you go. The hottest stars are the blue stars.
Which group represents stars that are hot and very bright?
The brightest stars are called supergiants. Star clusters are rich in stars just off the main sequence called red giants. Main sequence stars are called dwarfs. And the faint, hot stars are called white dwarfs.
Which category of stars has the greatest brightness?
Examples include Aldebaran and Mira. The stars in group C are even more luminous than the giants. These are the supergiants, the largest of stars with extremely high luminosities. A red supergiant such as Betelgeuse would extend beyond the orbit of Jupiter if it replaced the Sun in our solar system.
Which star is the hottest star quizlet?
Blue or white are the hottest and red is the coolest. Our own star, the Sun, is nearly in the middle of both the temperature and luminosity scales relative to other stars.
What spectral class of stars is the hottest?
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 star is the hottest in the HR diagram?
The graph may seem backwards, since hotter stars are on the left and cooler stars are on the right. The H-R diagram for the brightest stars in the sky is biased toward red and blue giant stars.
…
The Pleiades Data.
| Cluster | RA | Dec |
|---|---|---|
| Double Cluster | 34.75 | 57.15 |
| NGC 2451 | 116.35 | 37.97 |
| M34 | 40.5 | 42.78 |
What type of visible star is the coolest?
- A red dwarf is the smallest and coolest kind of star on the main sequence. …
- The coolest red dwarfs near the Sun have a surface temperature of ~2,000 K and the smallest have radii of ~9% that of the Sun, with masses about ~7.5% that of the Sun.
Which color star is hottest?
Stars have different colors, which are indicators of temperature. The hottest stars tend to appear blue or blue-white, whereas the coolest stars are red.
What is the shiniest star?
Sirius, also known as the Dog Star or Sirius A, is the brightest star in Earth’s night sky. The name means “glowing” in Greek — a fitting description, as only a few planets, the full moon and the International Space Station outshine this star.
What are the 5 brightest stars?
The top 10 brightest stars in the night sky.
- Sirius A (Alpha Canis Majoris) …
- Canopus (Alpha Carinae) …
- Rigil Kentaurus (Alpha Centauri) …
- Arcturus (Alpha Bootis) …
- Vega (Alpha Lyrae) …
- Capella (Alpha Aurigae) …
- Rigel (Beta Orionis)
15 нояб. 2019 г.
Which star is hotter Antares or Polaris?
Polaris has a hotter surface temperature than Antares with more than twice the temperature.
Which star is more massive than the sun?
At the top end of the scale, the most massive known star in the sky is R136a1, a star more than 300 times as massive as our sun.
Which type of star is generally the hottest?
O stars are the hottest, with temperatures from about 20,000K up to more than 100,000K. These stars have few absorption lines, generally due to helium. These stars burn out in a few million years. B stars have temperatures between about 10,000 and 20,000K.
What are the 7 types of stars?
There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B stars are uncommon but very bright; M stars are common but dim..
What is the biggest star?
UY Scuti
What is the closest star to our sun?
Of the three stars in the system, the dimmest – called Proxima Centauri – is actually the nearest star to the Sun. The two bright stars, called Alpha Centauri A and B form a close binary system; they are separated by only 23 times the Earth – Sun distance.