Document
... • Learn some astronomy. The details are not so important, the fact that we have been able to learn so much about the Universe is a more important point. ...
... • Learn some astronomy. The details are not so important, the fact that we have been able to learn so much about the Universe is a more important point. ...
Integrative Studies 410 Our Place in the Universe
... • Conclusion: there are no stars beyond a certain distance ...
... • Conclusion: there are no stars beyond a certain distance ...
Variable and Binary Stars
... – 75% of O-type stars seem to have a companion – If Jupiter had been ~100 times more massive, the Sun would have a companion star ...
... – 75% of O-type stars seem to have a companion – If Jupiter had been ~100 times more massive, the Sun would have a companion star ...
Stars
... Mizar, 88 light years distant, is the middle star in the handle of the Big Dipper. It was the first binary star system to be imaged with a telescope. Spectroscopic observations show periodic Doppler shifts in the spectra of Mizar A and B, indicating that they are each binary stars. But they were too ...
... Mizar, 88 light years distant, is the middle star in the handle of the Big Dipper. It was the first binary star system to be imaged with a telescope. Spectroscopic observations show periodic Doppler shifts in the spectra of Mizar A and B, indicating that they are each binary stars. But they were too ...
Slide 1
... • Most striking: many galaxies experience collisions thus becoming “interacting galaxies” • Read 21.4 Starburst galaxies and 21.5 Quasars and active galactic nuclei in detail for Thur ...
... • Most striking: many galaxies experience collisions thus becoming “interacting galaxies” • Read 21.4 Starburst galaxies and 21.5 Quasars and active galactic nuclei in detail for Thur ...
New Directions in Star Cluster Research
... Theory is validated by observations Evidence often derived from past events Information we can gather is very restricted - apparent brightness (depends on distance), luminosity, temperature, chemical composition, mass, radius ...
... Theory is validated by observations Evidence often derived from past events Information we can gather is very restricted - apparent brightness (depends on distance), luminosity, temperature, chemical composition, mass, radius ...
Inverse Square Law
... If you think about this expression for a minute you will see that it makes sense. If both stars appear equally bright as seen from Earth, then the more distant star is the brighter one. Now to change a brightness ratio bA / bB or a luminosity ratio LA / LB to a magnitude difference we can use Table ...
... If you think about this expression for a minute you will see that it makes sense. If both stars appear equally bright as seen from Earth, then the more distant star is the brighter one. Now to change a brightness ratio bA / bB or a luminosity ratio LA / LB to a magnitude difference we can use Table ...
Lecture 3
... • A blackbody is an ideal emitter that absorbs all incident energy and reradiates the energy. • We can use this to determine the temperatures of stars and planets. ...
... • A blackbody is an ideal emitter that absorbs all incident energy and reradiates the energy. • We can use this to determine the temperatures of stars and planets. ...
File
... (blue light travels slower through glass than red light and thus is refracted more) 3. The Recording Device views, records, analyses the different wavelengths formed. Spectrum can be recorded: Using Photographic Plates that records stellar spectra but each photographic film only converts 1% of i ...
... (blue light travels slower through glass than red light and thus is refracted more) 3. The Recording Device views, records, analyses the different wavelengths formed. Spectrum can be recorded: Using Photographic Plates that records stellar spectra but each photographic film only converts 1% of i ...
Chapter 28 Stars and Galaxies Reading Guide
... magnitude of –26.7. How could this be true? The friend can be referring to absolute magnitude and not apparent magnitude ...
... magnitude of –26.7. How could this be true? The friend can be referring to absolute magnitude and not apparent magnitude ...
ASTR101 Unit 10 Assessment Answer Key 1. Mass, luminosity, size
... from about 60 solar masses to about 1/12 solar mass, in luminosity from about 1,000,000 to 1/10,000 solar luminosities, in radius from about 1,000 to 1/10 solar radii, in surface temperature from about 35,000 to 3,000 K, and in age, from about 13 billion years to stars that are just now being born. ...
... from about 60 solar masses to about 1/12 solar mass, in luminosity from about 1,000,000 to 1/10,000 solar luminosities, in radius from about 1,000 to 1/10 solar radii, in surface temperature from about 35,000 to 3,000 K, and in age, from about 13 billion years to stars that are just now being born. ...
MEASURING DISTANCES IN ASTRONOMY
... • Proper motion [arcsec/s] = change of angular position • Line-of-sight motion [km/s] - measured via Doppler shift • Comparison of average stellar proper motion in cluster with average line-of-sight speed yields distance to cluster ...
... • Proper motion [arcsec/s] = change of angular position • Line-of-sight motion [km/s] - measured via Doppler shift • Comparison of average stellar proper motion in cluster with average line-of-sight speed yields distance to cluster ...
BASIC PROPERTIES of STARS - 2
... 105 km/s (A 150; B 200; C 300; D 400 seconds) (2) What is the approximate time to get a return signal from Venus when Venus is at its most distant position? (A 850; B 1700; C 2550; D 3400 seconds) If (1) is 300 seconds and (2) is 1700 seconds, what is 1 AU in km? ...
... 105 km/s (A 150; B 200; C 300; D 400 seconds) (2) What is the approximate time to get a return signal from Venus when Venus is at its most distant position? (A 850; B 1700; C 2550; D 3400 seconds) If (1) is 300 seconds and (2) is 1700 seconds, what is 1 AU in km? ...
Groups of Stars
... • Many stars exist in groups of two or more stars that are held close together because of gravity • More than half of all stars are members of star systems • Is our Sun part of a star system? ...
... • Many stars exist in groups of two or more stars that are held close together because of gravity • More than half of all stars are members of star systems • Is our Sun part of a star system? ...
Measuring the ligth
... Lo When the source is extended, we use the magnitude per squared second, µ , which is in turn related to the intensity as in I µ = −2.5 log fo In practice, the observing field will not be 1 squared second, depending on the characteristics of the telescope, but a solid angle A. If we detect m using A ...
... Lo When the source is extended, we use the magnitude per squared second, µ , which is in turn related to the intensity as in I µ = −2.5 log fo In practice, the observing field will not be 1 squared second, depending on the characteristics of the telescope, but a solid angle A. If we detect m using A ...
Stellar Physics - University of Reading
... – The first star to have its parallax measured was 61 Cygni. Its parallax was 0.33”. How far away is it? – d = 1/p = 1/0.33 = 3 pc – The nearest star, Proxima Centauri is at a distance of 1.3 pc. What is its parallax? – p = 1/d = 1/1.3 = 0.77” ...
... – The first star to have its parallax measured was 61 Cygni. Its parallax was 0.33”. How far away is it? – d = 1/p = 1/0.33 = 3 pc – The nearest star, Proxima Centauri is at a distance of 1.3 pc. What is its parallax? – p = 1/d = 1/1.3 = 0.77” ...
Globular Cluster in Canes Venatici
... stars within each cubic light year) than in the Sun’s neighborhood. If the earth orbitted a star located in a globular cluster, the next nearest star would be light months away rather than light years. ...
... stars within each cubic light year) than in the Sun’s neighborhood. If the earth orbitted a star located in a globular cluster, the next nearest star would be light months away rather than light years. ...
Problem Sheet for Introduction to Astrophysics
... a) If you could stand on the event horizon of a one-solar-mass black hole (M=1.991030 kg), what is the tidal force acting on you? (Assume your weight is 70kg and your height is 2 m) b) If you could stand on the event horizon of a 109 solar mass black hole, what is the tidal force acting on you (the ...
... a) If you could stand on the event horizon of a one-solar-mass black hole (M=1.991030 kg), what is the tidal force acting on you? (Assume your weight is 70kg and your height is 2 m) b) If you could stand on the event horizon of a 109 solar mass black hole, what is the tidal force acting on you (the ...
SPACE EXPLORATION UNIT
... You need to know the distance to the tree but no means of measuring the distance directly. Is there some other way you can estimate it? --- YES!! By using a distance you know, you can calculate the unknown distance indirectly. Triangulation measures distance indirectly by creating an imaginary trian ...
... You need to know the distance to the tree but no means of measuring the distance directly. Is there some other way you can estimate it? --- YES!! By using a distance you know, you can calculate the unknown distance indirectly. Triangulation measures distance indirectly by creating an imaginary trian ...
Supernovae - Cloudfront.net
... the amount of energy created in a Type Ia Supernova is always about the same. Thus its luminosity is always the same. A Type Ia Supernova in another galaxy is thus a good standard candle to use to find the distance to the galaxy ...
... the amount of energy created in a Type Ia Supernova is always about the same. Thus its luminosity is always the same. A Type Ia Supernova in another galaxy is thus a good standard candle to use to find the distance to the galaxy ...
1 Ay 124 Winter 2014 – HOMEWORK #1
... Assume for the time being that the Galaxy has no dust, and that we are observing along a line of sight at b = 0 deg and l = 180 deg. We are interested in observing the most distant solar-type stars (MV ' +5.1) possible, but our apparent magnitude limit for the observations is mV = 24.0. The central ...
... Assume for the time being that the Galaxy has no dust, and that we are observing along a line of sight at b = 0 deg and l = 180 deg. We are interested in observing the most distant solar-type stars (MV ' +5.1) possible, but our apparent magnitude limit for the observations is mV = 24.0. The central ...
10.5 The Hertzsprung
... Many stars are in binary pairs; measurement of their orbital motion allows determination of the masses of the stars. Orbits of visual binaries can be observed directly; Doppler shifts in spectroscopic binaries allow measurement of motion; and the period of eclipsing binaries can be measured using in ...
... Many stars are in binary pairs; measurement of their orbital motion allows determination of the masses of the stars. Orbits of visual binaries can be observed directly; Doppler shifts in spectroscopic binaries allow measurement of motion; and the period of eclipsing binaries can be measured using in ...
PH507 - University of Kent
... 6.00 x 107 m and 6.96 x 108 m, respectively. [Hint – you don’t need to know the absolute value of the solar luminosity] ...
... 6.00 x 107 m and 6.96 x 108 m, respectively. [Hint – you don’t need to know the absolute value of the solar luminosity] ...
Stars_Galaxies_Introduction - Etiwanda E
... What are the astronomical units of measurement? – What is absolute magnitude? – What is apparent magnitude? – How is parallax used to determine distance? – What are light years? ...
... What are the astronomical units of measurement? – What is absolute magnitude? – What is apparent magnitude? – How is parallax used to determine distance? – What are light years? ...
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.