Stellar Evolution Review
... c) they only emit infrared radiation d) they are all moving away from Earth so fast that their visible light is Doppler shifted into the infrared ...
... c) they only emit infrared radiation d) they are all moving away from Earth so fast that their visible light is Doppler shifted into the infrared ...
ASTR-1020: Astronomy II Course Lecture Notes - Faculty
... e) Population I star Cepheids (called Type I or classical Cepheids) have a slightly different period-luminosity relationship than the Population II star cepheids (called Type II Cepheids or W Virginis stars). 3. Lower mass versions of Cepheids exist called RR Lyrae type variables, which change in br ...
... e) Population I star Cepheids (called Type I or classical Cepheids) have a slightly different period-luminosity relationship than the Population II star cepheids (called Type II Cepheids or W Virginis stars). 3. Lower mass versions of Cepheids exist called RR Lyrae type variables, which change in br ...
February 2013 - astronomy for beginners
... realised by Sir William Herschel nearly 200 years ago. He was attempting to measure the distances to stars over a long period and realised some double stars had moved relative to their partner. These stars became known as Binary Stars. Binary stars tend to have similar masses and it is very unusual ...
... realised by Sir William Herschel nearly 200 years ago. He was attempting to measure the distances to stars over a long period and realised some double stars had moved relative to their partner. These stars became known as Binary Stars. Binary stars tend to have similar masses and it is very unusual ...
Teaching astrophysics in VCE Physics
... $ Parallax was eventually discovered (in 1835 for Vega). It was found that the closer stars showed parallax of less than one arcsecond (less than 1/3600th of a degree). $ 1 parsec is the distance to a star that would show 1 arcsecond of parallax: d = 1/p (So all stars are further than 1 pc). 1 pc is ...
... $ Parallax was eventually discovered (in 1835 for Vega). It was found that the closer stars showed parallax of less than one arcsecond (less than 1/3600th of a degree). $ 1 parsec is the distance to a star that would show 1 arcsecond of parallax: d = 1/p (So all stars are further than 1 pc). 1 pc is ...
iaf2001_paper (doc - 1.8 MB)
... COROT scientific committee on the basis of a set of preparatory observations. The main characteristics of the observation fields (radius = 10°), centered at 6 h 50 and 18 h 50, are the following : ...
... COROT scientific committee on the basis of a set of preparatory observations. The main characteristics of the observation fields (radius = 10°), centered at 6 h 50 and 18 h 50, are the following : ...
S T A R S
... Alpha Centauri is the closest binary to our sun and Proxima Centauri orbits this binary. Omega Centauri (NGC 5139) is globular cluster. The two pointers Apha & Beta Centauri point to Crux. (NGC is the abbreviation for New General Catalogue which is a listing of star clusters, nebulae and galaxies.) ...
... Alpha Centauri is the closest binary to our sun and Proxima Centauri orbits this binary. Omega Centauri (NGC 5139) is globular cluster. The two pointers Apha & Beta Centauri point to Crux. (NGC is the abbreviation for New General Catalogue which is a listing of star clusters, nebulae and galaxies.) ...
AST1100 Lecture Notes
... first thought to be caused by dark spots on a rotating star’s surface: When the dark spots were turned towards us, the star appeared fainter, when the spots were turned away from us, the star appeared brighter. Today we know that these periodic variations in the star’s magnitude is due to pulsations ...
... first thought to be caused by dark spots on a rotating star’s surface: When the dark spots were turned towards us, the star appeared fainter, when the spots were turned away from us, the star appeared brighter. Today we know that these periodic variations in the star’s magnitude is due to pulsations ...
Astronomy Assignment #1
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
Hertzsprung-Russell Diagrams
... (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutionary stage. There are 3 very different types of stars: Most stars, including the sun, are "main sequence s ...
... (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutionary stage. There are 3 very different types of stars: Most stars, including the sun, are "main sequence s ...
The Lives of Stars
... Relatively young Population I stars are metal rich; ancient Population II stars are metal poor The metals (heavy elements) in Population I stars were manufactured by thermonuclear reactions in an earlier generation of Population II stars, then ejected into space and incorporated into a later stellar ...
... Relatively young Population I stars are metal rich; ancient Population II stars are metal poor The metals (heavy elements) in Population I stars were manufactured by thermonuclear reactions in an earlier generation of Population II stars, then ejected into space and incorporated into a later stellar ...
pkt 14 Astrophysics
... distance from the center of black hole where the escape velocity is equal to the speed of light ...
... distance from the center of black hole where the escape velocity is equal to the speed of light ...
33-3 - Fremont Peak Observatory
... the black background of the night sky. That “hazy cloud” turns into rings of color once the camera has time to soak in the photons emitted by the expanding gases of the planetary nebula. But I’ve digressed. I’m looking at winter Milky Way objects tonight and Cassiopeia is high in the northeast. Let’ ...
... the black background of the night sky. That “hazy cloud” turns into rings of color once the camera has time to soak in the photons emitted by the expanding gases of the planetary nebula. But I’ve digressed. I’m looking at winter Milky Way objects tonight and Cassiopeia is high in the northeast. Let’ ...
Nature of Stars 2
... stars with the naked eye is often quoted as a test of eyesight, although even people with quite poor eyesight can see the two stars. Mizar is itself a binary star system! But not one you can see with your naked eye. ...
... stars with the naked eye is often quoted as a test of eyesight, although even people with quite poor eyesight can see the two stars. Mizar is itself a binary star system! But not one you can see with your naked eye. ...
Astronomy_Stellar_Evolution_and_Type_II_Supernovae_Exam
... 3) This event is possible with stellar remnants which exceed 1.4 solar masses, where the Chandrasekhar limit is exceeded and further collapse occurs. The unit of measurement named a “Foe” (1051 ergs) was derived to describe this : 4) Stellar remnants which, due to their very precise periods (rivalin ...
... 3) This event is possible with stellar remnants which exceed 1.4 solar masses, where the Chandrasekhar limit is exceeded and further collapse occurs. The unit of measurement named a “Foe” (1051 ergs) was derived to describe this : 4) Stellar remnants which, due to their very precise periods (rivalin ...
Chapter 13 section 3
... nebula (NEB yuh luh). The pull of gravity between the particles of gas and dust causes the nebula to contract, or shrink. The nebula can break apart into smaller and smaller pieces. Each piece eventually might collapse to form a star. The particles in the smaller pieces of nebula move closer togethe ...
... nebula (NEB yuh luh). The pull of gravity between the particles of gas and dust causes the nebula to contract, or shrink. The nebula can break apart into smaller and smaller pieces. Each piece eventually might collapse to form a star. The particles in the smaller pieces of nebula move closer togethe ...
June 2015 - Bristol Astronomical Society
... Of all multiple star systems consisting of at least three stars, perhaps the finest and most celebrated of all is Epsilon (ε Lyr) Lyrae. Epsilon Lyrae is located in the constellation of Lyra close to the bright star Vega (mag. 0.0). For northern hemisphere observers Vega dazzles brilliantly during t ...
... Of all multiple star systems consisting of at least three stars, perhaps the finest and most celebrated of all is Epsilon (ε Lyr) Lyrae. Epsilon Lyrae is located in the constellation of Lyra close to the bright star Vega (mag. 0.0). For northern hemisphere observers Vega dazzles brilliantly during t ...
chapter 2
... In order to identify the stars in a constellation, Greek alphabetical letters have been used. The Greek alphabet is as follows. Eta Nu Tau Alpha Beta ...
... In order to identify the stars in a constellation, Greek alphabetical letters have been used. The Greek alphabet is as follows. Eta Nu Tau Alpha Beta ...
Galaxies, Cosmology and the Accelera`ng Universe
... – 10 x Sun: 32 million years, up to 1 million 6mes brighter – Sun: 10 billion years – 0.1 x Sun: 3 trillion years, 8% as bright ...
... – 10 x Sun: 32 million years, up to 1 million 6mes brighter – Sun: 10 billion years – 0.1 x Sun: 3 trillion years, 8% as bright ...
January 2013 - astronomy for beginners
... Rigel is in fact the largest of a system of three stars, all orbiting each other. The second brightest member of this group, which is a double itself, is visible using a modest telescope but is small and faint compared to its big brother Rigel. The stars in the Rigel system are true members of Orion ...
... Rigel is in fact the largest of a system of three stars, all orbiting each other. The second brightest member of this group, which is a double itself, is visible using a modest telescope but is small and faint compared to its big brother Rigel. The stars in the Rigel system are true members of Orion ...
PEGASUS, THE FLYING HORSE Pegasus is a constellation in the
... back to Earth after Zeus either threw a thunderbolt at him or made Pegasus buck him off. In ancient Persia, Pegasus was depicted by al-Sufi as a complete horse facing east, unlike most other uranographers, who had depicted Pegasus as half of a horse, rising out of the ocean. CHARACTERISTICS The thre ...
... back to Earth after Zeus either threw a thunderbolt at him or made Pegasus buck him off. In ancient Persia, Pegasus was depicted by al-Sufi as a complete horse facing east, unlike most other uranographers, who had depicted Pegasus as half of a horse, rising out of the ocean. CHARACTERISTICS The thre ...
ASTRONOMY 120
... How do astronomers test the theory of stellar evolution? (3 points) Stars change so slowly over time, that we have no hope of observing the changes they go through directly in a human lifetime or even in all of human history. However, we have a galaxy full of many stars at different stages of develo ...
... How do astronomers test the theory of stellar evolution? (3 points) Stars change so slowly over time, that we have no hope of observing the changes they go through directly in a human lifetime or even in all of human history. However, we have a galaxy full of many stars at different stages of develo ...
Diffuse Ultraviolet Emission in Galaxies
... P Cygni’s spectrum is quite unlike that of most stars. Typically, a stellar spectrum will feature numerous dark “absorption” lines, which are produced by atoms in its outer layers absorbing certain wavelengths of light emitted from below. A star’s spectrum may also exhibit bright “emission” lines—th ...
... P Cygni’s spectrum is quite unlike that of most stars. Typically, a stellar spectrum will feature numerous dark “absorption” lines, which are produced by atoms in its outer layers absorbing certain wavelengths of light emitted from below. A star’s spectrum may also exhibit bright “emission” lines—th ...
chapter15SurveyStars..
... • Some stars vary in brightness because they cannot achieve proper balance between power welling up from the core and power radiated from the surface ...
... • Some stars vary in brightness because they cannot achieve proper balance between power welling up from the core and power radiated from the surface ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.