Determining the Cepheid Period–Luminosity Relation Using
... Observatoire de Genève, Switzerland The near-infrared surface brightness method has been applied to 111 Cepheids in the Milky Way, the Large Magellanic Cloud and the Small Magellanic Cloud, and distances and luminosities to the individual stars have thus been determined. As the Cepheid populations ...
... Observatoire de Genève, Switzerland The near-infrared surface brightness method has been applied to 111 Cepheids in the Milky Way, the Large Magellanic Cloud and the Small Magellanic Cloud, and distances and luminosities to the individual stars have thus been determined. As the Cepheid populations ...
The Hubble Space Telescope - the first 10 years
... • Well some stars are known to pulsate at a rate which depends on their brightness. • We can use this to calculate the distances to nearby galaxies. • In the case M100 in the Virgo cluster ...
... • Well some stars are known to pulsate at a rate which depends on their brightness. • We can use this to calculate the distances to nearby galaxies. • In the case M100 in the Virgo cluster ...
Practice Questions for Final
... A. The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real. B. Einstein's famous equation E = mc2 tells us that energy can turn into matter, but does not tell us that it can turn into antimatter. C. During the first 0.001 second ...
... A. The fact that we live in a universe made of matter is not surprising, because antimatter has never been shown to exist for real. B. Einstein's famous equation E = mc2 tells us that energy can turn into matter, but does not tell us that it can turn into antimatter. C. During the first 0.001 second ...
Characteristics of Stars PLATO
... • Scientists believe the universe we see today began with a giant explosion called the big bang. • Astronomers estimate the universe is 10-15 billion years old. ...
... • Scientists believe the universe we see today began with a giant explosion called the big bang. • Astronomers estimate the universe is 10-15 billion years old. ...
I. Stars - SharpSchool
... Hertzsprung-Russell Diagram http://aspire.cosmic-ray.org/labs/star_life/hr_diagram.html ...
... Hertzsprung-Russell Diagram http://aspire.cosmic-ray.org/labs/star_life/hr_diagram.html ...
Intro to Astronomy
... His assistant named Johannes Kepler continued TB’s work by analyzing the planets’ orbits and mapped Mar’s orbit. He thought the orbit was round but his calculations did not match up. He discovered that the orbit must not be circular but an ellipse. ...
... His assistant named Johannes Kepler continued TB’s work by analyzing the planets’ orbits and mapped Mar’s orbit. He thought the orbit was round but his calculations did not match up. He discovered that the orbit must not be circular but an ellipse. ...
Chapter 26
... B. H-R Diagram Graph of the surface temp., or color and absolute brightness of sample stars 2. Used to estimate the sizes of the stars and their distances, and to infer how stars change over time 3. Main sequence- diagonal line on the diagram where 90% of stars are found 4. Supergiants- very bright ...
... B. H-R Diagram Graph of the surface temp., or color and absolute brightness of sample stars 2. Used to estimate the sizes of the stars and their distances, and to infer how stars change over time 3. Main sequence- diagonal line on the diagram where 90% of stars are found 4. Supergiants- very bright ...
1” “Sky-Notes” of the Open University Astronomy Club. June 2005. A
... individual stars in a 4" (100mm) telescope. Increasing aperture brings greater rewards. lord Rosse and others using the 72" at Birr Castle in the 19th century observed three dark rifts radiating from the centre. later visual observers confirmed these. However with the advent of photography the rifts ...
... individual stars in a 4" (100mm) telescope. Increasing aperture brings greater rewards. lord Rosse and others using the 72" at Birr Castle in the 19th century observed three dark rifts radiating from the centre. later visual observers confirmed these. However with the advent of photography the rifts ...
Photometric analysis of the globular cluster NGC5466
... its primaeval existence, was mostly made of hydrogen and helium; then, the percentage of metals rose as the time passed by, because of their formation in the nucleus of stars). Thanks to their lack of gas and dust, we can measure the stellar density and study theoretically the dynamical evolution in ...
... its primaeval existence, was mostly made of hydrogen and helium; then, the percentage of metals rose as the time passed by, because of their formation in the nucleus of stars). Thanks to their lack of gas and dust, we can measure the stellar density and study theoretically the dynamical evolution in ...
angular size - Particle and Astroparticle Physics
... • We still refer to many of these groupings • Astronomers call them constellations (from the Latin for “group of stars”) ...
... • We still refer to many of these groupings • Astronomers call them constellations (from the Latin for “group of stars”) ...
Locating things in the Sky
... We also have a need for a different co-ordinate system in astronomy to describe where things are in the sky... We use a system called Right Ascention (RA) and Declination (dec). RA is like longitute and describes how far round an object is, and declination is like latitude and describes how far up ...
... We also have a need for a different co-ordinate system in astronomy to describe where things are in the sky... We use a system called Right Ascention (RA) and Declination (dec). RA is like longitute and describes how far round an object is, and declination is like latitude and describes how far up ...
Lecture 4 - Orbits of the planets
... The ratio of volume of Jupiter to volume of solar system (inside orbit of Neptune) • Want (volume of Jupiter) / (volume of Neptune's orbit) = (4/3)π(radius of Jupiter)3 / (4/3)π(radius of Neptune’s orbit)3 = (radius of Jupiter)3 / (radius of Neptune’s orbit)3 Lecture slide gives diameters not radii ...
... The ratio of volume of Jupiter to volume of solar system (inside orbit of Neptune) • Want (volume of Jupiter) / (volume of Neptune's orbit) = (4/3)π(radius of Jupiter)3 / (4/3)π(radius of Neptune’s orbit)3 = (radius of Jupiter)3 / (radius of Neptune’s orbit)3 Lecture slide gives diameters not radii ...
November 2008 - Otterbein University
... • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
... • measure distances to other galaxies using the periodluminosity relationship for Cepheid variables • Type I supernovae also used to measure distances – Predictable luminosity – a standard candle ...
Scale - Physics
... 1) To explore planetary sizes 2) To explore star sizes/planetary distances 3) To explore distances between stars 4) To explore galaxy size 5) To explore groupings of galaxies 6) To explore the observable universe ...
... 1) To explore planetary sizes 2) To explore star sizes/planetary distances 3) To explore distances between stars 4) To explore galaxy size 5) To explore groupings of galaxies 6) To explore the observable universe ...
Friday, August 29
... The Trouble with Angles • Angular size of an object cannot tell us its actual size – depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth ...
... The Trouble with Angles • Angular size of an object cannot tell us its actual size – depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth ...
Stars and Black Holes: Stars A star is a massive, luminous ball of
... A nebula is a large cloud of ______________. Nebulae are often called ______________ because stars develop from gas and dust. A nebula is formed when a ______________ or “old star” explodes. This explosion provides the matter for the nebula. How a Star is Born A region of nebula _____________ in on ...
... A nebula is a large cloud of ______________. Nebulae are often called ______________ because stars develop from gas and dust. A nebula is formed when a ______________ or “old star” explodes. This explosion provides the matter for the nebula. How a Star is Born A region of nebula _____________ in on ...
June 2016 - Flint River Astronomy Club
... This ‘n That. Murphy’s Law. During the Mercury transit observing at The Garden, Aaron Calhoun announced that the International Space Station would cross the Sun’s face in about fifteen minutes. Since the odds of having those two bodies transiting the Sun at the same time are somewhere between slim a ...
... This ‘n That. Murphy’s Law. During the Mercury transit observing at The Garden, Aaron Calhoun announced that the International Space Station would cross the Sun’s face in about fifteen minutes. Since the odds of having those two bodies transiting the Sun at the same time are somewhere between slim a ...
Good Vibrations and Stellar Pulsations - Physics
... Are the spiral Nebulae (such as M31 = Andromeda) comparable in size with the Milky Way, or are they much smaller and near? In 1925, Edwin Hubble discovered a Classical Cepheid in M31. ...
... Are the spiral Nebulae (such as M31 = Andromeda) comparable in size with the Milky Way, or are they much smaller and near? In 1925, Edwin Hubble discovered a Classical Cepheid in M31. ...
Space Science Unit - World of Teaching
... star and the absolute magnitude (brightness) of the star to help astronomers decide which phase of the star’s life cycle the star is in and other important information about the star. • Most stars are what we consider main sequence (including our sun). They make up 90% of the stars in our sky. These ...
... star and the absolute magnitude (brightness) of the star to help astronomers decide which phase of the star’s life cycle the star is in and other important information about the star. • Most stars are what we consider main sequence (including our sun). They make up 90% of the stars in our sky. These ...
Ch. 22 Honors Study Guide Name 1. How did Eratosthenes
... 7. Even though Copernicus was right about the Heliocentric model, the planets did not line up where he thought they should. What was wrong with Copernicus’ model? 8. Why were Tycho Brahe’s observations so important in Astronomy? 9. Why didn’t Tycho Brahe believe the Sun was the center of the Solar S ...
... 7. Even though Copernicus was right about the Heliocentric model, the planets did not line up where he thought they should. What was wrong with Copernicus’ model? 8. Why were Tycho Brahe’s observations so important in Astronomy? 9. Why didn’t Tycho Brahe believe the Sun was the center of the Solar S ...
Astronomy Test Review
... 17. A main-sequence star is at equilibrium between gravity and gas pressure. 18. The main fuel for main-sequence stars is hydrogen while red giants burn helium. ...
... 17. A main-sequence star is at equilibrium between gravity and gas pressure. 18. The main fuel for main-sequence stars is hydrogen while red giants burn helium. ...
GEOCENTRIC AND HELIOCENTRIC MODELS
... Interstellar (distances between the stars) are measured using the light-year (l.y.). Since light travels about 9.5 trillion km per year, this distance is considered one light year. Astronomers have developed another useful unit for smaller distances in space. In the solar system, for instance, the s ...
... Interstellar (distances between the stars) are measured using the light-year (l.y.). Since light travels about 9.5 trillion km per year, this distance is considered one light year. Astronomers have developed another useful unit for smaller distances in space. In the solar system, for instance, the s ...
Space Science Unit
... star and the absolute magnitude (brightness) of the star to help astronomers decide which phase of the star’s life cycle the star is in and other important information about the star. • Most stars are what we consider main sequence (including our sun). They make up 90% of the stars in our sky. These ...
... star and the absolute magnitude (brightness) of the star to help astronomers decide which phase of the star’s life cycle the star is in and other important information about the star. • Most stars are what we consider main sequence (including our sun). They make up 90% of the stars in our sky. These ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.