The measure of Cosmological distances
... Found new planet (Uranus)Discover Infra-Red lightFirst map of the sky: Idea: All the stars are the same. Therefore, bright stars are closer. ...
... Found new planet (Uranus)Discover Infra-Red lightFirst map of the sky: Idea: All the stars are the same. Therefore, bright stars are closer. ...
Star Names and Catalogs
... Hubble Space Telescope Guide Star Catalog. This is an immense list of 15,169,873 stars, all too faint to be seen by the naked eye, whose positions are used to help in pointing the Hubble Space Telescope (see Figure 1-3 on page 4 of Universe). Stars from this catalog have GSC numbers, such as the sta ...
... Hubble Space Telescope Guide Star Catalog. This is an immense list of 15,169,873 stars, all too faint to be seen by the naked eye, whose positions are used to help in pointing the Hubble Space Telescope (see Figure 1-3 on page 4 of Universe). Stars from this catalog have GSC numbers, such as the sta ...
Chapter 15 Stars, Galaxies
... 11. Rigel is very hot, so each square meter of its photosphere gives off a lot of light. Betelgeuse is a fairly cool star, so each square meter of its photosphere doesn’t give off much light. 12. a. How far the star is from Earth b. How bright the star actually is 13. a. The brightness of a star as ...
... 11. Rigel is very hot, so each square meter of its photosphere gives off a lot of light. Betelgeuse is a fairly cool star, so each square meter of its photosphere doesn’t give off much light. 12. a. How far the star is from Earth b. How bright the star actually is 13. a. The brightness of a star as ...
NASC 1100
... Spectral Type The surface temperature also determines the line spectrum of a star. Hot stars display lines of highly ionized elements, while cool stars show molecular lines. Stars are classified by assigning a spectral type. The hottest stars are called spectral type O, followed by B, A, F, G, K, M ...
... Spectral Type The surface temperature also determines the line spectrum of a star. Hot stars display lines of highly ionized elements, while cool stars show molecular lines. Stars are classified by assigning a spectral type. The hottest stars are called spectral type O, followed by B, A, F, G, K, M ...
upperMS - CWRU Astronomy
... OBN stars come from mass loss in OB stars Say the CN cycle converts CN in the inner 60% of a star over 15% of its main sequence lifetime If 40% of the remaining mass can be removed in the final 85% of the lifetime, then it’s a nitrogen rich star It’s ok to lose this much mass and still be OB, but i ...
... OBN stars come from mass loss in OB stars Say the CN cycle converts CN in the inner 60% of a star over 15% of its main sequence lifetime If 40% of the remaining mass can be removed in the final 85% of the lifetime, then it’s a nitrogen rich star It’s ok to lose this much mass and still be OB, but i ...
Parallax, Event Horizon, HR diagrams equation
... "1 Light Year is the distance traveled by light in one year." 1 light year (ly) is equivalent to: 63,270 AU Closer stars could appear larger. More distant stars could be very large, but seem small. How can we tell which stars are farther away? ...
... "1 Light Year is the distance traveled by light in one year." 1 light year (ly) is equivalent to: 63,270 AU Closer stars could appear larger. More distant stars could be very large, but seem small. How can we tell which stars are farther away? ...
Autumn - Dark Sky Discovery
... The plough is perhaps the most easily recognised group of stars in the northern sky and it is a very useful ‘skymark’. The plough is always above the horizon and allows us to find Polaris, or the Pole Star. If you imagine the plough as a saucepan, then you can follow the two stars furthest from the ...
... The plough is perhaps the most easily recognised group of stars in the northern sky and it is a very useful ‘skymark’. The plough is always above the horizon and allows us to find Polaris, or the Pole Star. If you imagine the plough as a saucepan, then you can follow the two stars furthest from the ...
Neutron Stars
... gravitational contraction can overcome the degenerate electron pressure that held the core during the last stages of the star. – Then the electrons and protons can combine under this pressure and transform into neutrons. – Pulsars – rotating neutron stars ...
... gravitational contraction can overcome the degenerate electron pressure that held the core during the last stages of the star. – Then the electrons and protons can combine under this pressure and transform into neutrons. – Pulsars – rotating neutron stars ...
Chapter 30 Section 2 Handout
... Horizontal axis: The temperature of a star’s surface. Vertical axis: The luminosity of a star. ...
... Horizontal axis: The temperature of a star’s surface. Vertical axis: The luminosity of a star. ...
The Milky Way - Midlandstech
... Evidence for Stellar Evolution: Variable Stars Some stars show intrinsic brightness variations not caused by eclipsing in binary systems. Most important example: d Cephei ...
... Evidence for Stellar Evolution: Variable Stars Some stars show intrinsic brightness variations not caused by eclipsing in binary systems. Most important example: d Cephei ...
Arcturus and Pollux
... • The sun of Neptune with an amazon huntress as a mother. He became the world’s greatest hunter, became overly confident, and came to a tragic end when an itty-bitty scorpion stung him. • Another version, he got a little too close with Diana, and Apollo in anger bet his sister that she couldn’t hit ...
... • The sun of Neptune with an amazon huntress as a mother. He became the world’s greatest hunter, became overly confident, and came to a tragic end when an itty-bitty scorpion stung him. • Another version, he got a little too close with Diana, and Apollo in anger bet his sister that she couldn’t hit ...
The Milky Way - 清華大學物理系歡迎頁 Welcome to
... Evidence for Stellar Evolution: Variable Stars Some stars show intrinsic brightness variations not caused by eclipsing in binary systems. Most important example: d Cephei ...
... Evidence for Stellar Evolution: Variable Stars Some stars show intrinsic brightness variations not caused by eclipsing in binary systems. Most important example: d Cephei ...
The Milky Way
... Star appears slightly shifted from different positions of the Earth on its orbit The farther away the star is (larger d), the smaller the parallax angle p. ...
... Star appears slightly shifted from different positions of the Earth on its orbit The farther away the star is (larger d), the smaller the parallax angle p. ...
Lecture 14 - Center for Astrophysics and Space Astronomy CASA
... Astrometric Binary proper motion wiggles to show orbit Spectrum Binary spectra of two stars of different type Spectroscopic Binary Doppler shift shows orbital motion Eclipsing Binary light varies Half of all stars are in binaries…. Binary stars are formed at birth. Both components will have same age ...
... Astrometric Binary proper motion wiggles to show orbit Spectrum Binary spectra of two stars of different type Spectroscopic Binary Doppler shift shows orbital motion Eclipsing Binary light varies Half of all stars are in binaries…. Binary stars are formed at birth. Both components will have same age ...
Luminosity Classes
... They get noticeably dimmer, then brighter, then dimmer again. These are called Variable Stars. The change in luminosity is due to a change in size. (Though temperature changes too.) ...
... They get noticeably dimmer, then brighter, then dimmer again. These are called Variable Stars. The change in luminosity is due to a change in size. (Though temperature changes too.) ...
May - RASC St. John`s Centre
... All of the very bright stars mentioned above, along with many of the other brighter ones in each constellation, are more obvious and easier to locate during twilight, before all the fainter stars surrounding them become visible as well. These won’t all be above the horizon at any one time, but once ...
... All of the very bright stars mentioned above, along with many of the other brighter ones in each constellation, are more obvious and easier to locate during twilight, before all the fainter stars surrounding them become visible as well. These won’t all be above the horizon at any one time, but once ...
Microsoft Power Point version
... of its life. What are the three major classes of binary star systems? • A visual binary is a pair of orbiting stars that we can see distinctly. An eclipsing binary reveals its binary nature because of periodic dimming that occurs when one star eclipses the other as viewed from Earth. A spectroscopic ...
... of its life. What are the three major classes of binary star systems? • A visual binary is a pair of orbiting stars that we can see distinctly. An eclipsing binary reveals its binary nature because of periodic dimming that occurs when one star eclipses the other as viewed from Earth. A spectroscopic ...
16. Properties of Stars
... its life. What are the three major classes of binary star systems? • A visual binary is a pair of orbiting stars that we can see distinctly. An eclipsing binary reveals its binary nature because of periodic dimming that occurs when one star eclipses the other as viewed from Earth. A spectroscopic bi ...
... its life. What are the three major classes of binary star systems? • A visual binary is a pair of orbiting stars that we can see distinctly. An eclipsing binary reveals its binary nature because of periodic dimming that occurs when one star eclipses the other as viewed from Earth. A spectroscopic bi ...
Review for Astronomy Exam 1
... Heraclitus: the Universe is made of Fire Empedocles: the Universe is made of Water, Air, Fire, Earth Aristotle: the Universe has 8 crystalline spheres (Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn, Stars) he added a fifth element “quintessence” to his cosmological system Ptolemaic model of the U ...
... Heraclitus: the Universe is made of Fire Empedocles: the Universe is made of Water, Air, Fire, Earth Aristotle: the Universe has 8 crystalline spheres (Moon, Mercury, Venus, Sun, Mars, Jupiter, Saturn, Stars) he added a fifth element “quintessence” to his cosmological system Ptolemaic model of the U ...
Slide 1 - Typepad
... closest region of massive star formation to Earth.) This is much further out than… Nearest and Brightest stars 5-15 light years Consider: Lecture 1,II – Stars on the celestial sphere < 500 light years ...
... closest region of massive star formation to Earth.) This is much further out than… Nearest and Brightest stars 5-15 light years Consider: Lecture 1,II – Stars on the celestial sphere < 500 light years ...
Life Cycle of a Star - CullenScience
... 2. Adding atoms to the center of a protostar is a process astronomers call _______________. 3. In order to achieve life as a star, the protostar will need to achieve and maintain ___________. What is equilibrium? It is a balance, in this case a balance between gravity pulling atoms toward the center ...
... 2. Adding atoms to the center of a protostar is a process astronomers call _______________. 3. In order to achieve life as a star, the protostar will need to achieve and maintain ___________. What is equilibrium? It is a balance, in this case a balance between gravity pulling atoms toward the center ...
Celestial Distances - Wayne State University
... They are more common than the cepheids, but less luminous Their periods are always less than one day, and their changes in brightness are typically less than about a factor of 2 From observations, astronomers have concluded that RR Lyrae variables all have nearly the same intrinsic luminosity, of ab ...
... They are more common than the cepheids, but less luminous Their periods are always less than one day, and their changes in brightness are typically less than about a factor of 2 From observations, astronomers have concluded that RR Lyrae variables all have nearly the same intrinsic luminosity, of ab ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.