Note
... • [Fe/H] = -1.0 is the same as 1/10 solar • [Fe/H] = -2.0 is the same as 1/100 solar • [m/Fe] = log N(m)/N(Fe)star – log N(m)/N(Fe)Sun • [Ca/Fe] = +0.3 means twice the number of Ca atoms per Fe atom ...
... • [Fe/H] = -1.0 is the same as 1/10 solar • [Fe/H] = -2.0 is the same as 1/100 solar • [m/Fe] = log N(m)/N(Fe)star – log N(m)/N(Fe)Sun • [Ca/Fe] = +0.3 means twice the number of Ca atoms per Fe atom ...
Variable star information
... periodic manner. These pulsations translate into a periodic variation of the light they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the observed brightness of an extrinsic variable star are either due to some process that ...
... periodic manner. These pulsations translate into a periodic variation of the light they emit. The most well known stars of this kind are Cepheid variables that have very stable pulsation periods. The changes in the observed brightness of an extrinsic variable star are either due to some process that ...
Stellar Parallax
... We do this with the following arbitarary definition:M = m when the star is viewed from a distance d = 10 pc. Then M = m -5 log10d + 5 We now have a link between M,m and d where d is in parsecs. [Note: we have assumed that the inverse square law is the only reason for the dimming of the light from th ...
... We do this with the following arbitarary definition:M = m when the star is viewed from a distance d = 10 pc. Then M = m -5 log10d + 5 We now have a link between M,m and d where d is in parsecs. [Note: we have assumed that the inverse square law is the only reason for the dimming of the light from th ...
Stars and Planets - The University of Texas at Dallas
... with the Earth at the center of the Universe. This cosmology of the nature of the Universe was adopted by the Catholic church. Image From http://www-gap.dcs.stand.ac.uk/~history/Mathematicians/Ptolemy.html Copernican Revolution: Led by Copernicus, Galileo, and Kepler, the Copernican Revolution gave ...
... with the Earth at the center of the Universe. This cosmology of the nature of the Universe was adopted by the Catholic church. Image From http://www-gap.dcs.stand.ac.uk/~history/Mathematicians/Ptolemy.html Copernican Revolution: Led by Copernicus, Galileo, and Kepler, the Copernican Revolution gave ...
Working with the Illinois Learning Standards: A Constructivist
... Stars evolve much as animals evolve. The source of energy of the stars is unknown. As stars shrink due to gravity, they change from red to blue. Red stars are hot; blue stars are cool. Stars are all roughly the same size. Stars change little over their life spans. Stars can only last thousands or mi ...
... Stars evolve much as animals evolve. The source of energy of the stars is unknown. As stars shrink due to gravity, they change from red to blue. Red stars are hot; blue stars are cool. Stars are all roughly the same size. Stars change little over their life spans. Stars can only last thousands or mi ...
Celestial Motions
... They depend on latitude because your position on Earth determines which constellations remain below the horizon. (They depend on time of year because Earth’s orbit changes the apparent location of the Sun among the stars.) ...
... They depend on latitude because your position on Earth determines which constellations remain below the horizon. (They depend on time of year because Earth’s orbit changes the apparent location of the Sun among the stars.) ...
Not Always the Southern Cross! Which Way`s South?
... Bush Astronomy – A Couple of Pointers on The Southern Cross I don’t know about you, but once the fire dies down to a few glowering coals and I look up into the cool night sky, my eyes are always drawn to my favourite constellation, the Southern Cross. Once I’ve found it, it makes me feel, well, comfo ...
... Bush Astronomy – A Couple of Pointers on The Southern Cross I don’t know about you, but once the fire dies down to a few glowering coals and I look up into the cool night sky, my eyes are always drawn to my favourite constellation, the Southern Cross. Once I’ve found it, it makes me feel, well, comfo ...
How far away are the Stars?
... • The closer the object the larger the parallax. • Parallaxes are usually very small. Parallax of Venus at closest approach (45 million km) is 1 arc minute! • Parallax of nearby (25 light years) stars not observed/measured until 1839! ...
... • The closer the object the larger the parallax. • Parallaxes are usually very small. Parallax of Venus at closest approach (45 million km) is 1 arc minute! • Parallax of nearby (25 light years) stars not observed/measured until 1839! ...
Stars
... • The North Star is called Polaris and located directly above the North Pole. This star appears in the same place every night all year long. • In the Northern Hemisphere, if you find Polaris you will be able to tell which direction is north. ...
... • The North Star is called Polaris and located directly above the North Pole. This star appears in the same place every night all year long. • In the Northern Hemisphere, if you find Polaris you will be able to tell which direction is north. ...
Sources of Gravitational Waves Peter Shawhan
... Orbit will continue to decay (inspiral) over the next ~300 million years, until… ...
... Orbit will continue to decay (inspiral) over the next ~300 million years, until… ...
Milky Way
... •Total of a few hundred billion stars Disk Stars 60 billion •Total mass about 100 billion Sun •Stars mostly concentrated near center Disk Gas ~10 billiion 20 billion •Treat gravity as if it all comes from a Bulge Halo Stars 1 billion point source in the center Nucleus 4 million •Use Kepler’s Third ...
... •Total of a few hundred billion stars Disk Stars 60 billion •Total mass about 100 billion Sun •Stars mostly concentrated near center Disk Gas ~10 billiion 20 billion •Treat gravity as if it all comes from a Bulge Halo Stars 1 billion point source in the center Nucleus 4 million •Use Kepler’s Third ...
Stars and Galaxies - La Salle Elementary Public Schools No 122
... Which of these refers to the distance light travels in one year? A. astronomical unit B. light-year C. solar magnitude D. 2 trillion km ...
... Which of these refers to the distance light travels in one year? A. astronomical unit B. light-year C. solar magnitude D. 2 trillion km ...
Stellar Evolution
... How does mass affect what happens? How do stars die? Where does gold come from? ...
... How does mass affect what happens? How do stars die? Where does gold come from? ...
DTU 8e Chap 11 Characterizing Stars
... types. Each dot on this graph represents a star whose luminosity and spectral type have been determined. The data points are grouped in just a few regions of the diagram, revealing that luminosity and spectral type are correlated: Mainsequence stars fall along the red curve, giants are to the right, ...
... types. Each dot on this graph represents a star whose luminosity and spectral type have been determined. The data points are grouped in just a few regions of the diagram, revealing that luminosity and spectral type are correlated: Mainsequence stars fall along the red curve, giants are to the right, ...
Astronomy 10 - UC Berkeley Astronomy w
... When the helium core is first formed, the core is not hot enough fuse the helium into heavier elements. Only once the red giant phase occurs, and the core contracts and heats up to a temperature of around 108 K is the core hot enough to start burning helium. (11) page 321, question 6 When a star she ...
... When the helium core is first formed, the core is not hot enough fuse the helium into heavier elements. Only once the red giant phase occurs, and the core contracts and heats up to a temperature of around 108 K is the core hot enough to start burning helium. (11) page 321, question 6 When a star she ...
Parallax - High Point University
... 2000. These images are captured using Fe IX-X 171 Å emission showing the solar corona at a temperature of about 1.3 million K. Many more sunspots, solar flares, and coronal mass ejections occur during the solar maximum. The numerous active regions and the number/size of magnetic loops in the recent ...
... 2000. These images are captured using Fe IX-X 171 Å emission showing the solar corona at a temperature of about 1.3 million K. Many more sunspots, solar flares, and coronal mass ejections occur during the solar maximum. The numerous active regions and the number/size of magnetic loops in the recent ...
Life Cycle of a Star
... What happens to a star after the main sequence phase? Old age and death! How long it takes for a star to die depends upon its initial mass. Larger stars have more fuel, but they have to burn (fuse) it faster in order to maintain equilibrium. Because thermonuclear fusion occurs at a faster rate in ma ...
... What happens to a star after the main sequence phase? Old age and death! How long it takes for a star to die depends upon its initial mass. Larger stars have more fuel, but they have to burn (fuse) it faster in order to maintain equilibrium. Because thermonuclear fusion occurs at a faster rate in ma ...
Test 3, February 7, 2007 - Brock physics
... 42. In order to detect a black hole one looks for (a) a spot into which stars and their planets fall. (b) a binary system where a companion star is not visible but has a mass greater than 3 solar masses and is an intense X-ray source. (c) intense source of visible light. (d) the accompanying white h ...
... 42. In order to detect a black hole one looks for (a) a spot into which stars and their planets fall. (b) a binary system where a companion star is not visible but has a mass greater than 3 solar masses and is an intense X-ray source. (c) intense source of visible light. (d) the accompanying white h ...
Classifying the Stars
... Classifying the Stars Brightness Stars give off different amounts of light depending on their size and temperature. ...
... Classifying the Stars Brightness Stars give off different amounts of light depending on their size and temperature. ...
Extreme Tidal Waves in Binary Star Systems
... created as the stars are stretched back and forth, as described above. The second way that tides can affect stars is by exciting large scale waves that move within the stars. These waves are periodic global deformations of the star, similar to the ringing of a bell. As the stars orbit one another, t ...
... created as the stars are stretched back and forth, as described above. The second way that tides can affect stars is by exciting large scale waves that move within the stars. These waves are periodic global deformations of the star, similar to the ringing of a bell. As the stars orbit one another, t ...
Star Types - University of Massachusetts Amherst
... Star A is closer than Star B Star B is closer than Star A The stars are at the same distance Not enough information is given ...
... Star A is closer than Star B Star B is closer than Star A The stars are at the same distance Not enough information is given ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.