Globular Clusters
... Dimmer yet, but still brighter than the sun-like yellow stars, are the "Blue Stragglers". These are large "main sequence" stars that use up their fuel fast and would be long gone had they formed like this at the same time as the other stars in the cluster. These are believed to be the result of old ...
... Dimmer yet, but still brighter than the sun-like yellow stars, are the "Blue Stragglers". These are large "main sequence" stars that use up their fuel fast and would be long gone had they formed like this at the same time as the other stars in the cluster. These are believed to be the result of old ...
Astronomy Puzzle-1
... 1. Lens system attached at the end of the telescope tube to view the object. 2. Light first falls on this lens/mirror. 3. Mirror placed at 450 to get image out of telescope pipe 4. Apparatus used to clear the image 5. Telescope is kept on the system for tracking and targeting the object. 6. Type of ...
... 1. Lens system attached at the end of the telescope tube to view the object. 2. Light first falls on this lens/mirror. 3. Mirror placed at 450 to get image out of telescope pipe 4. Apparatus used to clear the image 5. Telescope is kept on the system for tracking and targeting the object. 6. Type of ...
Stellar Magnetic Activity
... to 0.5 Mo .. The lower mass limit is the critical mass for hydrogen burning in the central cores of stars with solar abundances, while the upper limit corresponds to the spectral class M0. The radii of the red dwarfs span from 0.2R o . to about 0.6Ro . while their effective temperatures are in the r ...
... to 0.5 Mo .. The lower mass limit is the critical mass for hydrogen burning in the central cores of stars with solar abundances, while the upper limit corresponds to the spectral class M0. The radii of the red dwarfs span from 0.2R o . to about 0.6Ro . while their effective temperatures are in the r ...
The cosmic distance scale
... One of the standard candles is a rare type of variable star called a Cepheid. These stars are very luminous, which is good since this makes it possible to observe them from a fairly large distance. Using the HST, individual Cepheids can be resolved as far away as the Virgo cluster of galaxies. Cephe ...
... One of the standard candles is a rare type of variable star called a Cepheid. These stars are very luminous, which is good since this makes it possible to observe them from a fairly large distance. Using the HST, individual Cepheids can be resolved as far away as the Virgo cluster of galaxies. Cephe ...
Book: Introduction to Matter (in
... o If you double the volume of your substance, what happens to density? Text: Unit 1-Lesson 2: Properties of Matter 9. What is the difference between a physical and a chemical property of matter? 10. Identify/define various identifiable properties of a substance. Are these physical or chemical ...
... o If you double the volume of your substance, what happens to density? Text: Unit 1-Lesson 2: Properties of Matter 9. What is the difference between a physical and a chemical property of matter? 10. Identify/define various identifiable properties of a substance. Are these physical or chemical ...
Apparent Magnitude - RanelaghALevelPhysics
... • The apparent magnitude is given the code m. Magnitude 1 stars are about 100 times brighter than magnitude 6 stars. A change in 1 magnitude is a change of 2.512 (1001/5 = 2.512). The scale is logarithmic because each step corresponds to multiplying by a constant ...
... • The apparent magnitude is given the code m. Magnitude 1 stars are about 100 times brighter than magnitude 6 stars. A change in 1 magnitude is a change of 2.512 (1001/5 = 2.512). The scale is logarithmic because each step corresponds to multiplying by a constant ...
Cosmology with GMRT
... – Current limits Δα/α ~ few x 10-6, but with conflict between groups [Murphy et al. MNRAS 345,609,2003;Chand et al. A&A,417, 853, 2004; Levshakov et al. A&A, 466. 1077, 2007] ...
... – Current limits Δα/α ~ few x 10-6, but with conflict between groups [Murphy et al. MNRAS 345,609,2003;Chand et al. A&A,417, 853, 2004; Levshakov et al. A&A, 466. 1077, 2007] ...
PowerPoint
... – You will need to understand and be able to use any equations that have been introduced in class. Calculations using these equations will be kept simple--it is possible to do the exam without a calculator, but you can bring one if you wish. Nov 12, 2003 ...
... – You will need to understand and be able to use any equations that have been introduced in class. Calculations using these equations will be kept simple--it is possible to do the exam without a calculator, but you can bring one if you wish. Nov 12, 2003 ...
A Question of Planets - Vanderbilt University
... that their brightness varies dramatically. More recently astronomers have been studying them because they can provide important insights into how the Sun and solar system evolved. Twenty years ago, scientists thought that T Tauri stars had extremely strong solar winds blowing outward at velocities o ...
... that their brightness varies dramatically. More recently astronomers have been studying them because they can provide important insights into how the Sun and solar system evolved. Twenty years ago, scientists thought that T Tauri stars had extremely strong solar winds blowing outward at velocities o ...
poster
... Figure 3: FUV emission lines observed with FUSE in CTTS and best fit Gaussian profiles ordered by the shift in the O vi 1032 Å line. For RU Lup an additional absorption component is used. ...
... Figure 3: FUV emission lines observed with FUSE in CTTS and best fit Gaussian profiles ordered by the shift in the O vi 1032 Å line. For RU Lup an additional absorption component is used. ...
Table of Contents
... 6378 km from the Earth’s centre. On a marble-sized Earth we would only be 0.5 cm from its centre. This huge reduction in r makes the gravitational attraction more than a billion times greater than on Earth normally. It is this large force that allows a lot of strange things to happen to anything tha ...
... 6378 km from the Earth’s centre. On a marble-sized Earth we would only be 0.5 cm from its centre. This huge reduction in r makes the gravitational attraction more than a billion times greater than on Earth normally. It is this large force that allows a lot of strange things to happen to anything tha ...
ISA_lecture01 - School of Physics
... (c) has cleared the neighbourhood around its orbit. A “dwarf planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) ...
... (c) has cleared the neighbourhood around its orbit. A “dwarf planet” is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) ...
Section2_Coordinates.. - Faculty Web Sites at the University of Virginia
... - they are an angular measurement on the sky, i.e., perpendicular to the line of sight; that’s why they are also called tangential motions/tangential velocities. Units are arcsec/year, or mas/yr (arcsec/century). - largest proper motion known is that of Barnard’s star 10.3”/yr; typical ~ 0.1”/yr - r ...
... - they are an angular measurement on the sky, i.e., perpendicular to the line of sight; that’s why they are also called tangential motions/tangential velocities. Units are arcsec/year, or mas/yr (arcsec/century). - largest proper motion known is that of Barnard’s star 10.3”/yr; typical ~ 0.1”/yr - r ...
Stellar Properties
... resolved into two distinct star images (even if it takes a telescope to do this) are called visual binaries. The masses of the two stars in a binary system can be computed from measurements of the orbital period and orbital dimensions of the system. Some binaries can be detected and analyzed, ev ...
... resolved into two distinct star images (even if it takes a telescope to do this) are called visual binaries. The masses of the two stars in a binary system can be computed from measurements of the orbital period and orbital dimensions of the system. Some binaries can be detected and analyzed, ev ...
Question 1 The rings of Saturn are seen by Answer 1. reflected and
... . Two spaceships are traveling past Earth at 90% of the speed of light in opposite directions (i.e., they are approaching each other). One turns on a searchlight, which is seen by scientists aboard the other. What speed do the scientists measure for this light (c = speed of light in a vacuum)? ...
... . Two spaceships are traveling past Earth at 90% of the speed of light in opposite directions (i.e., they are approaching each other). One turns on a searchlight, which is seen by scientists aboard the other. What speed do the scientists measure for this light (c = speed of light in a vacuum)? ...
Cool as helium
... the uranium mineral cleveite with mineral acids and removing nitrogen and oxygen — only to notice the same yellow spectral line that had been observed from the Sun three decades earlier. That same year, Swedish chemists Per Teodor Cleve and Abraham Langlet also isolated helium, independently, and de ...
... the uranium mineral cleveite with mineral acids and removing nitrogen and oxygen — only to notice the same yellow spectral line that had been observed from the Sun three decades earlier. That same year, Swedish chemists Per Teodor Cleve and Abraham Langlet also isolated helium, independently, and de ...
Solutions to the 1 st Astronomy Exam
... south and is called the Antarctic Pole.” Why did Aristotle not mention that Polaris is a fairly bright star located near the Arctic Pole? Answer in a couple of sentences. Aristotle did not mention that Polaris is a fairly bright star located near the Arctic Pole because at that time there was no bri ...
... south and is called the Antarctic Pole.” Why did Aristotle not mention that Polaris is a fairly bright star located near the Arctic Pole? Answer in a couple of sentences. Aristotle did not mention that Polaris is a fairly bright star located near the Arctic Pole because at that time there was no bri ...
18 Throughout history people around the world have looked up at
... lore” stories and activities to learn more about Polaris and the circumpolar constellations with your students using one of the resources listed on page 20. At the end of the activity, make sure students understand that the stars do not move. The rotation of Earth on its axis allows us to see the st ...
... lore” stories and activities to learn more about Polaris and the circumpolar constellations with your students using one of the resources listed on page 20. At the end of the activity, make sure students understand that the stars do not move. The rotation of Earth on its axis allows us to see the st ...
Distances in Cosmology One of the most basic measurements that
... direction appears to change, by an amount that is inversely proportional to its distance from the viewing points. This is one of the ways we obtain depth perception; looking out with first one eye, then the other, shows that close things appear to move more than distant things. If you know the dista ...
... direction appears to change, by an amount that is inversely proportional to its distance from the viewing points. This is one of the ways we obtain depth perception; looking out with first one eye, then the other, shows that close things appear to move more than distant things. If you know the dista ...
Distance Measures: Parallax
... useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telesc ...
... useful at certain distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telesc ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.