AST101_lect_12
... • Stars generate luminosity through fusion of H into He • The lifetime of a star is proportional to the amount of fuel it has (mass) divided by the rate at which it expends the fuel (luminosity) • The lifetime τ ~ M/L • This is analogous to determining how often you have to refill the gas tank in yo ...
... • Stars generate luminosity through fusion of H into He • The lifetime of a star is proportional to the amount of fuel it has (mass) divided by the rate at which it expends the fuel (luminosity) • The lifetime τ ~ M/L • This is analogous to determining how often you have to refill the gas tank in yo ...
Coursework 7 File
... Exercise class question - not to be handed in 1. The atoms in a gas of temperature T have kinetic energies Eke = 32 kT on average. Assuming that this is the typical energy associated with collisions between hydrogen nuclei at the centre of the Sun, leading to fusion reactions, calculate the distance ...
... Exercise class question - not to be handed in 1. The atoms in a gas of temperature T have kinetic energies Eke = 32 kT on average. Assuming that this is the typical energy associated with collisions between hydrogen nuclei at the centre of the Sun, leading to fusion reactions, calculate the distance ...
Branches of Earth Science
... Light Year- Astronomers use light years to measure the distances ______________ stars o A light year is the distance that light ______________ in one year 9,460,730,472,580.8 km 5,878,630,000,000 miles Parallax- the apparent change in the ______________ of a star in the sky. o The change is due ...
... Light Year- Astronomers use light years to measure the distances ______________ stars o A light year is the distance that light ______________ in one year 9,460,730,472,580.8 km 5,878,630,000,000 miles Parallax- the apparent change in the ______________ of a star in the sky. o The change is due ...
Properties of Stars and H
... is being given off on the outside of a star. • Most of the nuclear fusion reactions happen in the core. While nuclear fusion is happening, the core is the hottest place in a star. • Dense things are hotter. Large and airy things are ...
... is being given off on the outside of a star. • Most of the nuclear fusion reactions happen in the core. While nuclear fusion is happening, the core is the hottest place in a star. • Dense things are hotter. Large and airy things are ...
Linking Asteroids and Meteorites through Reflectance
... • Collapsing due to gravity • The collapse is stopped by electron degeneracy pressure ...
... • Collapsing due to gravity • The collapse is stopped by electron degeneracy pressure ...
What are yellow stars?
... • Arcturus is one of the biggest stars, and one of the biggest yellow stars. • Arcturus is the brightest star in the Constellation of Boötes. • Arcturus is the 4th Brightest stars. • Arcturus is visible from both hemispheres in the sky. ...
... • Arcturus is one of the biggest stars, and one of the biggest yellow stars. • Arcturus is the brightest star in the Constellation of Boötes. • Arcturus is the 4th Brightest stars. • Arcturus is visible from both hemispheres in the sky. ...
Final Exam Review (Word doc)
... underwent a supernova explosion right now, approximately how long would it be until we found out about it? 5300 years. 9. The most important reason for measuring the parallax of a star is to help us find the stars' intrinsic brightness (absolute magnitude) or luminosity. 10. If two intrinsically ide ...
... underwent a supernova explosion right now, approximately how long would it be until we found out about it? 5300 years. 9. The most important reason for measuring the parallax of a star is to help us find the stars' intrinsic brightness (absolute magnitude) or luminosity. 10. If two intrinsically ide ...
Chapter 21 Study Guide
... 12. A building that contains one or more telescopes is called an _____________________________. 13. Name one reason why astronomers have built large telescopes on the tops of mountains. _____________________________________________________________________________________ 14. The Hubble Space Telesco ...
... 12. A building that contains one or more telescopes is called an _____________________________. 13. Name one reason why astronomers have built large telescopes on the tops of mountains. _____________________________________________________________________________________ 14. The Hubble Space Telesco ...
solution
... in units of power (energy per unit time). Apparent brightness is a function of the distance of an observer from a star and its luminosity. Therefore, two similar stars with identical luminosities can have very different apparent brightnesses if they are at different distances from an observer. Simil ...
... in units of power (energy per unit time). Apparent brightness is a function of the distance of an observer from a star and its luminosity. Therefore, two similar stars with identical luminosities can have very different apparent brightnesses if they are at different distances from an observer. Simil ...
Earth
... The sun is a huge, glowing sphere of hot gas. Most of this gas is hydrogen (about 70%) and helium (about 28%). Carbon, nitrogen and oxygen make up 1.5% and the other 0.5% is made up of small amounts of many other elements such as neon, iron, silicon, magnesium and sulfur. The sun shines because it i ...
... The sun is a huge, glowing sphere of hot gas. Most of this gas is hydrogen (about 70%) and helium (about 28%). Carbon, nitrogen and oxygen make up 1.5% and the other 0.5% is made up of small amounts of many other elements such as neon, iron, silicon, magnesium and sulfur. The sun shines because it i ...
Document
... E) Groups of 20,000 to 100,000 older stars that look like a ball of stars. They are often located in a spherical halo around galaxies. F) A large body composed either of rock (terrestrial) or gas (gas giants) which orbits the sun. They shine by reflecting light from the sun. G) All matter, energy, s ...
... E) Groups of 20,000 to 100,000 older stars that look like a ball of stars. They are often located in a spherical halo around galaxies. F) A large body composed either of rock (terrestrial) or gas (gas giants) which orbits the sun. They shine by reflecting light from the sun. G) All matter, energy, s ...
Astrophysics Presentation
... It is found that there is a simple massluminosity relationship for main sequence stars The luminosity increases with the cube of the mass (this is consistent with other clues about the size, density and mass) – big is brighter (much!) Big bright stars are burning ferociously and don’t ...
... It is found that there is a simple massluminosity relationship for main sequence stars The luminosity increases with the cube of the mass (this is consistent with other clues about the size, density and mass) – big is brighter (much!) Big bright stars are burning ferociously and don’t ...
BEA 1 a New “Old” Companion of WDS 06167+3852 J 591
... the night conditions. I make an average of the calibration parameters from these two pairs and I use this average for the reduction of all double stars measured during the night. Normally, I take from 50 to 100 images of each pair. Then, with Reduc I measure every image, discarding the worst, Finall ...
... the night conditions. I make an average of the calibration parameters from these two pairs and I use this average for the reduction of all double stars measured during the night. Normally, I take from 50 to 100 images of each pair. Then, with Reduc I measure every image, discarding the worst, Finall ...
What We Know About Stars So Far
... graph using this system (comparing surface temperature and luminosity), you will find that the stars fall into groups. ...
... graph using this system (comparing surface temperature and luminosity), you will find that the stars fall into groups. ...
16. Properties of Stars
... binary (P) and the distance between the stars (a), then you can calculate the sum of the masses of both stars (m1 + m2). ...
... binary (P) and the distance between the stars (a), then you can calculate the sum of the masses of both stars (m1 + m2). ...
Stars
... • A star that’s dim can appear bright if it’s close to Earth, and a star that is bright may seem dim if it’s far away. ...
... • A star that’s dim can appear bright if it’s close to Earth, and a star that is bright may seem dim if it’s far away. ...
Star Vocabulary
... 1. Apparent Magnitude- a measure of how bright a star appears to an observer. 2. Absolute Magnitude- a measure of how bright a star would be if all stars were at the same distance. 3. Luminosity- the actual brightness of a star. Depends only on the size and temperature of the star. 4.Doppler Effect- ...
... 1. Apparent Magnitude- a measure of how bright a star appears to an observer. 2. Absolute Magnitude- a measure of how bright a star would be if all stars were at the same distance. 3. Luminosity- the actual brightness of a star. Depends only on the size and temperature of the star. 4.Doppler Effect- ...
Document
... You know that Tan(Ø ) = d/D Today we have accurate parallaxes for about 10,000 stars. ...
... You know that Tan(Ø ) = d/D Today we have accurate parallaxes for about 10,000 stars. ...
Name ______KEY Date Core ______ Study Guide Galaxies and the
... When did the Big Bang happen and what has happened since? The big bang theory is theorized to have happened 14 billion years ago when the universe suddenly began to expand from one merged mass of matter or substance. At that time, all matter was dense and hot and the universe developed in less than ...
... When did the Big Bang happen and what has happened since? The big bang theory is theorized to have happened 14 billion years ago when the universe suddenly began to expand from one merged mass of matter or substance. At that time, all matter was dense and hot and the universe developed in less than ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.