Introduction to Astronomy
... If the star was at 10 parsecs distance from us, then its apparent magnitude would be equal to its absolute magnitude. The absolute magnitude is a measure of the star's luminosity---the total amount of energy radiated by the star every second. ...
... If the star was at 10 parsecs distance from us, then its apparent magnitude would be equal to its absolute magnitude. The absolute magnitude is a measure of the star's luminosity---the total amount of energy radiated by the star every second. ...
Astronomy and Space Science
... A: The ratio of brightness between two stars with magnitude m1 and m2 is 100(m2-m1)/5. One can easily check this formula with the definition. Now if a star of apparent magnitude m and distance d is moved to 10 pc from us and its new apparent magnitude is M, then the ratio of brightness is 100(M-m)/5 ...
... A: The ratio of brightness between two stars with magnitude m1 and m2 is 100(m2-m1)/5. One can easily check this formula with the definition. Now if a star of apparent magnitude m and distance d is moved to 10 pc from us and its new apparent magnitude is M, then the ratio of brightness is 100(M-m)/5 ...
planetary nebulae
... very long time. The Sun has been shining for about 5 billion years and in all that time it has only lost 1% of its mass. ...
... very long time. The Sun has been shining for about 5 billion years and in all that time it has only lost 1% of its mass. ...
Supplemental Resources - Morehead Planetarium and Science
... meaning of these colors. Look up into the sky and you’ll see the stars twinkling in different colors. Some are dull and red, while others are white and others look bright blue. So how do you get so many different star colors? The color of a star depends on its surface temperature. Our Sun’s surface ...
... meaning of these colors. Look up into the sky and you’ll see the stars twinkling in different colors. Some are dull and red, while others are white and others look bright blue. So how do you get so many different star colors? The color of a star depends on its surface temperature. Our Sun’s surface ...
Review for Exam 2
... 2) What do all stars on the main sequence have in common? How does the 6me spent on the main sequence depend on mass? 3) What are the evolu6onary stages of stars of high-‐ and low-‐mass stars ...
... 2) What do all stars on the main sequence have in common? How does the 6me spent on the main sequence depend on mass? 3) What are the evolu6onary stages of stars of high-‐ and low-‐mass stars ...
Module 6: “The Message of Starlight Assignment 9: Parallax, stellar
... magnitude: how bright a star would be at a fixed distance from the sun. The unit of distance generally used in astronomy is called a parsec: one parsec is 3.26 light years. (A light year is how far light travels in a year.) Now, if we know the distance to the star, we can convert its brightness, mea ...
... magnitude: how bright a star would be at a fixed distance from the sun. The unit of distance generally used in astronomy is called a parsec: one parsec is 3.26 light years. (A light year is how far light travels in a year.) Now, if we know the distance to the star, we can convert its brightness, mea ...
Searching for planets around evolved stars with COROT
... of our precise radial velocity (RV) measurements of G and K giants (ref a). A number of stars from our list of 80 targets have been observed for 14 months, using the fibre-fed echelle spectrograph FEROS at the 1.52 m ESO telescope in La Silla, Chile. Long-term accuracy better than 10 m/s is required ...
... of our precise radial velocity (RV) measurements of G and K giants (ref a). A number of stars from our list of 80 targets have been observed for 14 months, using the fibre-fed echelle spectrograph FEROS at the 1.52 m ESO telescope in La Silla, Chile. Long-term accuracy better than 10 m/s is required ...
AY5 Announcements
... common, though hard to see. • Because it is in a binary orbit, the mass and extreme density of Sirius B was determined in 1910. Seemed completely impossible at the time. ...
... common, though hard to see. • Because it is in a binary orbit, the mass and extreme density of Sirius B was determined in 1910. Seemed completely impossible at the time. ...
PS #1 Solutions - Stars and Stellar Explosions 1. Opacity sources
... b) If all stars have roughly the same central temperature (that of the sun), use a scaling argument to estimate the stellar mass at which the simple non-interacting ideal gas assumption breaks down. SOLUTION: (a) An ideal gas is one in which the particles are far apart from one another, and one in w ...
... b) If all stars have roughly the same central temperature (that of the sun), use a scaling argument to estimate the stellar mass at which the simple non-interacting ideal gas assumption breaks down. SOLUTION: (a) An ideal gas is one in which the particles are far apart from one another, and one in w ...
Monday, March 31 - Otterbein University
... The Earth orbits the Sun at a distance of one meter Proxima Centauri lies 270 kilometers (170 miles) away Barnard’s Star lies 370 kilometers (230 miles) away Less than 100 stars lie within 1000 kilometers (600 miles) ...
... The Earth orbits the Sun at a distance of one meter Proxima Centauri lies 270 kilometers (170 miles) away Barnard’s Star lies 370 kilometers (230 miles) away Less than 100 stars lie within 1000 kilometers (600 miles) ...
Astronomy 10 - UC Berkeley Astronomy w
... (a) The kind of element you have is determined by the number of protons. If you remove one neutron, you still have helium. This is what we call an isotope of helium. (b) Now you have changed helium into a different element because you have changed the number of protons. You now have hydrogen, and in ...
... (a) The kind of element you have is determined by the number of protons. If you remove one neutron, you still have helium. This is what we call an isotope of helium. (b) Now you have changed helium into a different element because you have changed the number of protons. You now have hydrogen, and in ...
Chapter 20 Notes (smaller PDF file)
... which its core collapses and most of its matter is ejected into space at high speeds • The luminosity of the star increases suddenly by a factor of around 108 during this explosion, producing a supernova • The matter ejected from the supernova, moving at supersonic speeds through interstellar gases ...
... which its core collapses and most of its matter is ejected into space at high speeds • The luminosity of the star increases suddenly by a factor of around 108 during this explosion, producing a supernova • The matter ejected from the supernova, moving at supersonic speeds through interstellar gases ...
January 2006
... may look strange, e.g. K5III for Aldebaran. Ignore the roman numbers ( III means a giant star, V means dwarf star, etc). First letter is the spectral type: K (one of OBAFGKM), the arab number (5) is like a second digit to the spectral type, so K0 is very close to G, K9 is very close to M. ...
... may look strange, e.g. K5III for Aldebaran. Ignore the roman numbers ( III means a giant star, V means dwarf star, etc). First letter is the spectral type: K (one of OBAFGKM), the arab number (5) is like a second digit to the spectral type, so K0 is very close to G, K9 is very close to M. ...
NASAexplores 9-12 Lesson: Classified Stars - Science
... you while gazing into the night sky. The absolute magnitude and luminosity are used for that. They give you the relative brightness based on all of the stars being the same distance away from the earth. On this diagram, you do not see all of the individual stars. Since there are so many stars, only ...
... you while gazing into the night sky. The absolute magnitude and luminosity are used for that. They give you the relative brightness based on all of the stars being the same distance away from the earth. On this diagram, you do not see all of the individual stars. Since there are so many stars, only ...
large PDF file
... • The luminosity of the star increases suddenly by a factor of around 108 during this explosion, producing a supernova • The matter ejected from the supernova, moving at supersonic speeds through interstellar gases and dust, glows as a nebula called a supernova remnant ...
... • The luminosity of the star increases suddenly by a factor of around 108 during this explosion, producing a supernova • The matter ejected from the supernova, moving at supersonic speeds through interstellar gases and dust, glows as a nebula called a supernova remnant ...
slides - Department of Physics and Astronomy
... Many ancient cultures saw patterns in the sky and established their own constellations and star lore based on their culture and mythology. Most northern constellations dates back to Babylonians times, 4-5 millennia ago, – Later Greeks adopted them and interpreted according to their mythology ...
... Many ancient cultures saw patterns in the sky and established their own constellations and star lore based on their culture and mythology. Most northern constellations dates back to Babylonians times, 4-5 millennia ago, – Later Greeks adopted them and interpreted according to their mythology ...
Apparent versus Event Horizon
... gravity! Yet a white dwarf can contract no further; its electrons resist further compression by exerting an outward pressure that counteracts gravity. ...
... gravity! Yet a white dwarf can contract no further; its electrons resist further compression by exerting an outward pressure that counteracts gravity. ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.