Introduction to Stars ppt
... right. These stars fuse hydrogen into helium in their cores and have a wide range of life spans, which depend on their mass. Higher mass stars on main sequence have shorter life spans. A star has a limited supply of core hydrogen and therefore can remain as a hydrogen-fusing main sequence star for a ...
... right. These stars fuse hydrogen into helium in their cores and have a wide range of life spans, which depend on their mass. Higher mass stars on main sequence have shorter life spans. A star has a limited supply of core hydrogen and therefore can remain as a hydrogen-fusing main sequence star for a ...
Lecture 12
... source with the unit magnitudes • Magnitudes are a logarithmic representation of the spectral flux density of a source. – Allows for easy comparison of sources with immense ranges in flux density. – The magnitude system, let’s be honest, is not readily intuitive. ...
... source with the unit magnitudes • Magnitudes are a logarithmic representation of the spectral flux density of a source. – Allows for easy comparison of sources with immense ranges in flux density. – The magnitude system, let’s be honest, is not readily intuitive. ...
Document
... how bright it looks from Earth, you can determine how far away it must be to look that faint. • For any star in the sky, we KNOW: – Apparent Magnitude (m) – Spectral Type (O, B, A, F, G, K, M) – Luminosity Class (Main Sequence, Giant, etc…). These are denoted by a roman numeral (V, III, I,…). ...
... how bright it looks from Earth, you can determine how far away it must be to look that faint. • For any star in the sky, we KNOW: – Apparent Magnitude (m) – Spectral Type (O, B, A, F, G, K, M) – Luminosity Class (Main Sequence, Giant, etc…). These are denoted by a roman numeral (V, III, I,…). ...
Document
... • Astronomers have concluded that the Universe is expanding since all the galaxies, with the exception of other galaxies in the Local Group Galaxy Cluster, show a red shift. Within the Local Group, some show a red shift and others a blue shift, since some are moving toward the Milky Way and others a ...
... • Astronomers have concluded that the Universe is expanding since all the galaxies, with the exception of other galaxies in the Local Group Galaxy Cluster, show a red shift. Within the Local Group, some show a red shift and others a blue shift, since some are moving toward the Milky Way and others a ...
Chapter 10: Measuring the Stars - Otto
... • Expanded beyond stars visible to naked eye • One magnitude difference is 2.5X in brightness • A 1st magnitude star is 2.5X brighter than a 2nd magnitude star • Full moon has an apparent magnitude of -12.5 • Faintest objects visible by Hubble or Keck telescopes are apparent magnitude 30 ...
... • Expanded beyond stars visible to naked eye • One magnitude difference is 2.5X in brightness • A 1st magnitude star is 2.5X brighter than a 2nd magnitude star • Full moon has an apparent magnitude of -12.5 • Faintest objects visible by Hubble or Keck telescopes are apparent magnitude 30 ...
NOVAE and SUPERNOVAE
... Throughout history “new stars" have suddenly appeared in the night sky, then faded away. These objects were termed novae. Today, astronomers have determined that these new stars are actually stellar explosions. Nova explosions occur on the surface of white dwarfs, while supernova involve the ...
... Throughout history “new stars" have suddenly appeared in the night sky, then faded away. These objects were termed novae. Today, astronomers have determined that these new stars are actually stellar explosions. Nova explosions occur on the surface of white dwarfs, while supernova involve the ...
Introduction to Stars: Their Properties
... Define brightness, apparent magnitude, absolute magnitude. Describe the methods used to determine the temperature, luminosity, and radius of a star. ...
... Define brightness, apparent magnitude, absolute magnitude. Describe the methods used to determine the temperature, luminosity, and radius of a star. ...
Introduction to Astronomy
... The sun’s luminosity is about 4 x 1026 watts. • Apparent brightness is determined by the “intensity” of starlight striking a detector. It is measured (for example) in watts per square meter. The sun’s apparent brightness from earth’s location is about 1400 watts per square meter. ...
... The sun’s luminosity is about 4 x 1026 watts. • Apparent brightness is determined by the “intensity” of starlight striking a detector. It is measured (for example) in watts per square meter. The sun’s apparent brightness from earth’s location is about 1400 watts per square meter. ...
Finding the North Star
... How do I find the North Star? Ursa Major is easy to find, because in the middle of it are seven really bright stars. Some people call these seven stars the “Big Dipper,” others call them “Charles’s Wain” or “The Plough.” ...
... How do I find the North Star? Ursa Major is easy to find, because in the middle of it are seven really bright stars. Some people call these seven stars the “Big Dipper,” others call them “Charles’s Wain” or “The Plough.” ...
Finding the North Star
... How do I find the North Star? Ursa Major is easy to find, because in the middle of it are seven really bright stars. Some people call these seven stars the “Big Dipper,” others call them “Charles’s Wain” or “The Plough.” ...
... How do I find the North Star? Ursa Major is easy to find, because in the middle of it are seven really bright stars. Some people call these seven stars the “Big Dipper,” others call them “Charles’s Wain” or “The Plough.” ...
common constellations
... • Ursa Major is the best known of the constellation and it appears in every reference known. • Calisto was changed to a bear because of Zeus's jealousy and transferred her to the sky. This is improbable, as the constellation was already well established before this time. • The drawings all show a be ...
... • Ursa Major is the best known of the constellation and it appears in every reference known. • Calisto was changed to a bear because of Zeus's jealousy and transferred her to the sky. This is improbable, as the constellation was already well established before this time. • The drawings all show a be ...
Star Lifecycle
... Star ---> supergiant ---> supernova ---> neutron star or black hole (most massive stars) Pulsars – Spinning neutron stars that give off pulses of radio sources. Left over from super massive star supernovas. Black Holes – From the most massive stars (More than 40 times bigger than our sun). Noth ...
... Star ---> supergiant ---> supernova ---> neutron star or black hole (most massive stars) Pulsars – Spinning neutron stars that give off pulses of radio sources. Left over from super massive star supernovas. Black Holes – From the most massive stars (More than 40 times bigger than our sun). Noth ...
handout
... Walk to the Stars Imagine building a scale model of the nearby stars, with the nearest star, Alpha Centauri, placed 100 yards away. Sirius, the Dog Star, is about 200 yards away. The bright stars of the Big Dipper hover a Eris Pluto mile above our heads. (In the real world, they’re Neptune about 4, ...
... Walk to the Stars Imagine building a scale model of the nearby stars, with the nearest star, Alpha Centauri, placed 100 yards away. Sirius, the Dog Star, is about 200 yards away. The bright stars of the Big Dipper hover a Eris Pluto mile above our heads. (In the real world, they’re Neptune about 4, ...
Astronomy Tour
... Comets are “dirty snowballs” composed of frozen water and dust. As they approach the Sun they melt and leave a stream of water vapor and dust that is a “tail” Scientists believe that these originate from a large region filled with comet cores called the Oort ...
... Comets are “dirty snowballs” composed of frozen water and dust. As they approach the Sun they melt and leave a stream of water vapor and dust that is a “tail” Scientists believe that these originate from a large region filled with comet cores called the Oort ...
Studying the Stars
... Pogson assigned the brightest stars the first order of magnitude (magnitude = 1), and dimmer stars were 2nd, 3rd, 4th order, etc. (magnitudes = 2, 3, 4, etc.) Now that we can be more accurate in our measurements, stars can have more specific magnitudes like 1.5, 6.73, etc. and even negative numbers ...
... Pogson assigned the brightest stars the first order of magnitude (magnitude = 1), and dimmer stars were 2nd, 3rd, 4th order, etc. (magnitudes = 2, 3, 4, etc.) Now that we can be more accurate in our measurements, stars can have more specific magnitudes like 1.5, 6.73, etc. and even negative numbers ...
Core Theme 2: Constellations
... in their life based on the positions of the sun, moon, and other planetary objects at the time of their birth. ...
... in their life based on the positions of the sun, moon, and other planetary objects at the time of their birth. ...
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.