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- Astronomy Exam 3 Flashcards - Quizlet
Measurements show a certain star has a very high luminosity (100,000 x the Sun's) while its temperature is quite cool (3500oK) How can this be? it must be quite large in size Astronomers identify the main sequence on the H-R diagram with what activity in the course of a star's life? fusing hydrogen into helium in their cores
- Wandering stars pass through our solar system surprisingly often
A star called Gliese 710 will pass within 10,000 astronomical units — 1 AU is equal to the average Earth-Sun distance of 93 million miles That’s well within the outer edge of the Oort Cloud
- Lecture 6: The Motions of the Stars - Ohio State University
Proper Motion is the apparent angular motion of a star across the sky with respect to more distant stars Typical proper motion is ~0 1 arcsec year Largest: 10 25 arcsec yr (Barnard's Star) This is the projection onto the sky of the star's true motions through space relative to the Sun
- 5 The Motion of Stars - University of Tennessee
With respect to the local field of stars, the Sun is moving at 19 7 kms 1 toward a point in the constellation Hercules (near the star Vega, which is in Lyra) that is called the solar apex
- 17. 4 Using Spectra to Measure Stellar Radius, Composition, and Motion
If the star is not moving with respect to the Sun, then the wavelength corresponding to each element will be the same as those we measure in a laboratory here on Earth But if stars are moving toward or away from us, we must consider the Doppler effect (see The Doppler Effect section)
- Teach Astronomy - Stellar Motion
Astrometry is the precise study of the positions and motions of stars If both radial and tangential velocities are known, they can be combined to give the star's space velocity (its true speed) and direction of motion in three-dimensional space relative to the Sun
- Understanding Astronomy: Motion of the Stars - Weber State University
Stars rising in the east, as viewed from Ogden, Utah The camera was mounted on a tripod and the shutter was left open for ten minutes, to show the stars’ apparent motion The foreground mountains were illuminated by city lights As time passes, the stars rise in the east (just like the sun)
- What Is Barnard’s Star And Will It Collide With Our Sun? - Science ABC
Thus Barnard’s Star, which is often misunderstood as the Doomsday star, will start to head back after reaching a point of minimum distance to the sun, roughly 3 75 light-years away, in around 11,800 AD
- star - How and when will Sirius migrating towards the Sun trigger the . . .
Currently the Sirius binary star system is moving towards the Sun at 5 5km s for roughly the next 60 thousand years or so At the end of those years it will be 7 8 light years away from the Sun and roughly 6 8 light years away from the Kuiper belt with a magnitude of 1 64
- Stellar kinematics - Wikipedia
The component of stellar motion toward or away from the Sun, known as radial velocity, can be measured from the spectrum shift caused by the Doppler effect The transverse, or proper motion must be found by taking a series of positional determinations against more distant objects
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