Another Old Final
... (b) Estimate the distance to this supernova and the lookback time (how long ago we are observing it). (c) Type-Ia supernovae reach peak luminosities of 109 L . Estimate the peak apparent brightness of this supernova. Would it have been visible to the naked eye on a clear night? ...
... (b) Estimate the distance to this supernova and the lookback time (how long ago we are observing it). (c) Type-Ia supernovae reach peak luminosities of 109 L . Estimate the peak apparent brightness of this supernova. Would it have been visible to the naked eye on a clear night? ...
Lecture 31
... Found to have stars around them (galaxies) in most cases. Supermassive BH model suggests a billion solar masses by Eddington Limit--Max M(BH) = L /30,000 (Solar Ms & Ls). If larger mass, luminosity would blow away infalling material. QSO's: Radio quiet Quasi-Stellar Objects. ACTIVE GALAXIES: On aver ...
... Found to have stars around them (galaxies) in most cases. Supermassive BH model suggests a billion solar masses by Eddington Limit--Max M(BH) = L /30,000 (Solar Ms & Ls). If larger mass, luminosity would blow away infalling material. QSO's: Radio quiet Quasi-Stellar Objects. ACTIVE GALAXIES: On aver ...
Slide 1
... Clicker – Cepheids and distance • Two Cepheid stars, Fred and Barney, have the same apparent brightness. Fred has a period of 5 days, and Barney of 10 days. Which is closer ? ...
... Clicker – Cepheids and distance • Two Cepheid stars, Fred and Barney, have the same apparent brightness. Fred has a period of 5 days, and Barney of 10 days. Which is closer ? ...
Homework #2
... Variables. If a Type I Cepheid variable star is observed (in another galaxy) with a period of 30 days and if that Cepheid has an apparent magnitude m = 20.0, what is the distance to that Galaxy in parsecs? b) Suppose another Cepheid also with m = 20.0 had that same period, but was actually Type II a ...
... Variables. If a Type I Cepheid variable star is observed (in another galaxy) with a period of 30 days and if that Cepheid has an apparent magnitude m = 20.0, what is the distance to that Galaxy in parsecs? b) Suppose another Cepheid also with m = 20.0 had that same period, but was actually Type II a ...
Section 27.2
... White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen without a telescope. Can you locate blue giants on the H-R diagram? ...
... White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen without a telescope. Can you locate blue giants on the H-R diagram? ...
Answer titese questions on a piece of loose leaf paper.
... to measure distances to nearby stars. Qiini: Think about the thumb demo we didin class.) I I . The Hcrczspiung-Russcll diagram shows the relationship between wliai two charaeteiistios of stars? 12- More than 90% of all stars arc cotisiderx;d stars and can be found in a diagonal path aaoss the center ...
... to measure distances to nearby stars. Qiini: Think about the thumb demo we didin class.) I I . The Hcrczspiung-Russcll diagram shows the relationship between wliai two charaeteiistios of stars? 12- More than 90% of all stars arc cotisiderx;d stars and can be found in a diagonal path aaoss the center ...
(HR) Diagrams
... Also note that the spectral classes of stars correspond to a variation in temperature. O stars have the hottest photosphere and atmosphere, and M stars the coldest. According to the laws of physics for the behavior of blackbodies (Wien’s law and the StefanBoltzmann law), it is these temperatures tha ...
... Also note that the spectral classes of stars correspond to a variation in temperature. O stars have the hottest photosphere and atmosphere, and M stars the coldest. According to the laws of physics for the behavior of blackbodies (Wien’s law and the StefanBoltzmann law), it is these temperatures tha ...
Chapter 1 Daily Note Sheets Completed Power Point
... brightest to the dimmest. Use the Greek alphabet α alpha is the brightest, β Beta is next brightest, γ gamma is next etc….. Then use the Latin Possessive. • Example alpha Ursa Minoris ( brightest star in Ursa Major) Polaris, alpha Canis Majoris ( brightest star in Canis Major) Sirius ...
... brightest to the dimmest. Use the Greek alphabet α alpha is the brightest, β Beta is next brightest, γ gamma is next etc….. Then use the Latin Possessive. • Example alpha Ursa Minoris ( brightest star in Ursa Major) Polaris, alpha Canis Majoris ( brightest star in Canis Major) Sirius ...
1/2016
... age (estimates between 230 and 300 million years). Thirty stars are proven members and contained in a volume of about 7 light years diameter. Its apparent visual brightness of 4.6 magnitude corresponds to an absolute magnitude of -2.5, or an intrinsic luminosity of 830 suns. M39's brightest star is ...
... age (estimates between 230 and 300 million years). Thirty stars are proven members and contained in a volume of about 7 light years diameter. Its apparent visual brightness of 4.6 magnitude corresponds to an absolute magnitude of -2.5, or an intrinsic luminosity of 830 suns. M39's brightest star is ...
The (Stellar) Parallax View
... Many new astronomers marvel at the vast distances separating astronomical objects, but after a while wonder how do we know for sure how big these distances are. After all we cannot send a probe to the star Altair to confirm that it is 17 light years away. So how do we measure the distances to the st ...
... Many new astronomers marvel at the vast distances separating astronomical objects, but after a while wonder how do we know for sure how big these distances are. After all we cannot send a probe to the star Altair to confirm that it is 17 light years away. So how do we measure the distances to the st ...
What We Know About Stars So Far
... waves – help us to create images of distant objects that cannot be seen. ...
... waves – help us to create images of distant objects that cannot be seen. ...
Teacher Sheet 1. What variables does the HR Diagram compare
... 14. Describe stars A, B, C, and D in terms of their brightness and temperature. Star A is red and therefore, cool. Its luminosity is 1/1000 of that of the sun; therefore, it is dim. Star B is a hot, blue star and very luminous. Both A and B are on the Main Sequence. Star C is also a hot, blue star. ...
... 14. Describe stars A, B, C, and D in terms of their brightness and temperature. Star A is red and therefore, cool. Its luminosity is 1/1000 of that of the sun; therefore, it is dim. Star B is a hot, blue star and very luminous. Both A and B are on the Main Sequence. Star C is also a hot, blue star. ...
Introduction to Stars ppt
... Most stars fall along the main sequence – upper left to lower 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 ther ...
... Most stars fall along the main sequence – upper left to lower 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 ther ...
I CAN SEE THE STARS IN YOUR EYES
... at this speed, the trip from Earth to the sun, a distance of 93 million miles, would take about 8 minutes, not very long for such a long trip! Yet, to get to the next closest star, Proxima Centauri, would take 4.2 years. “Hmmm…,” you think to yourself, “that might be an interesting fact to include i ...
... at this speed, the trip from Earth to the sun, a distance of 93 million miles, would take about 8 minutes, not very long for such a long trip! Yet, to get to the next closest star, Proxima Centauri, would take 4.2 years. “Hmmm…,” you think to yourself, “that might be an interesting fact to include i ...
O star
... spectral type and the luminosity class of a star from its spectrum. This is extraordinarily valuable, as it means that, just from the spectrum of a star, one can plot it in on the H-R diagram. BUT: if you can plot a star on the H-R diagram, you know its absolute magnitude! And if you know its absolu ...
... spectral type and the luminosity class of a star from its spectrum. This is extraordinarily valuable, as it means that, just from the spectrum of a star, one can plot it in on the H-R diagram. BUT: if you can plot a star on the H-R diagram, you know its absolute magnitude! And if you know its absolu ...
Nov 2017 - What`s Out Tonight?
... and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters look like fuzzy balls because they contain all night and always outshines any star. Everyone enjoys its 4 tens of thousands star ...
... and hugs close to the Sun, so you see it for a short time in the longer in its group. west after sunset or in the east before sunrise. Jupiter can be out Globular Clusters look like fuzzy balls because they contain all night and always outshines any star. Everyone enjoys its 4 tens of thousands star ...
Sample Midterm - IUPUI Physics
... 13) Most of the Carbon, Oxygen, and Nitrogen in out bodies comes from: A) the birth of our universe (big bang) B) cores of stars like our sun C) from the outer parts of massive stars thrown into space D) fairly equally from all of these three sources 14) When a 50 solar mass star dies what is left ...
... 13) Most of the Carbon, Oxygen, and Nitrogen in out bodies comes from: A) the birth of our universe (big bang) B) cores of stars like our sun C) from the outer parts of massive stars thrown into space D) fairly equally from all of these three sources 14) When a 50 solar mass star dies what is left ...
Conceptobasico.pdf
... With absolute magnitude, one can compare the "true" brightness of the stars, since the comparison is always at the same distance. The color is an indication of the star's temperature and spectra. The spectrum of a star usually has a sequence of dark lines marking wavelengths that are absorbed by the ...
... With absolute magnitude, one can compare the "true" brightness of the stars, since the comparison is always at the same distance. The color is an indication of the star's temperature and spectra. The spectrum of a star usually has a sequence of dark lines marking wavelengths that are absorbed by the ...
PHYS 175 (2014) Final Examination Name: ___SOLUTION_____
... some rays of light from the source, which would not normally be directed toward the observer, can be deflected toward the observer. The effect may manifest itself as a halo, double image or even just an ...
... some rays of light from the source, which would not normally be directed toward the observer, can be deflected toward the observer. The effect may manifest itself as a halo, double image or even just an ...
chapter2
... Gravity is pulling on a slanted top. => Wobbling around the vertical. The sun’s gravity is doing the same to Earth. The resulting “wobbling” of Earth’s axis of rotation around the vertical w.r.t. the ecliptic takes about 26,000 years and is called precession. ...
... Gravity is pulling on a slanted top. => Wobbling around the vertical. The sun’s gravity is doing the same to Earth. The resulting “wobbling” of Earth’s axis of rotation around the vertical w.r.t. the ecliptic takes about 26,000 years and is called precession. ...
Scientists classify stars by
... would look the same because the two lights are exactly the same. Their absolute magnitude is the same. Distance makes them look different. The same is true for stars. Two stars could be the same brightness but their distance from us makes their brightness different. ...
... would look the same because the two lights are exactly the same. Their absolute magnitude is the same. Distance makes them look different. The same is true for stars. Two stars could be the same brightness but their distance from us makes their brightness different. ...
HR Diagram
... with a spectrograph. 8. If Rigel and Betelgeuse were the same size, explain why Rigel would appear brighter. __________________________________________________________________________________________ __________________________________________________________________________________________ 9. If sta ...
... with a spectrograph. 8. If Rigel and Betelgeuse were the same size, explain why Rigel would appear brighter. __________________________________________________________________________________________ __________________________________________________________________________________________ 9. If sta ...
Apparent Magnitude
... of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then ...
... of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then ...
proper motion
... apparent magnitudes. A 1st magnitude star is brighter than a 2nd magnitude star, which is brighter than a 3rd magnitude star, etc. In the 19th century the magnitude scale was more precisely defined. If two stars have an apparent luminosity ratio of 100, they have apparent magnitudes that differ by e ...
... apparent magnitudes. A 1st magnitude star is brighter than a 2nd magnitude star, which is brighter than a 3rd magnitude star, etc. In the 19th century the magnitude scale was more precisely defined. If two stars have an apparent luminosity ratio of 100, they have apparent magnitudes that differ by e ...
Malmquist bias
The Malmquist bias is an effect in observational astronomy which leads to the preferential detection of intrinsically bright objects. It was first described in 1922 by Swedish astronomer Gunnar Malmquist (1893–1982), who then greatly elaborated upon this work in 1925. In statistics, this bias is referred to as a selection bias and affects the survey results in a brightness limited survey, where stars below a certain apparent brightness are not included. Since observed stars and galaxies appear dimmer when farther away, the brightness that is measured will fall off with distance until their brightness falls below the observational threshold. Objects which are more luminous, or intrinsically brighter, can be observed at a greater distance, creating a false trend of increasing intrinsic brightness, and other related quantities, with distance. This effect has led to many spurious claims in the field of astronomy. Properly correcting for these effects has become an area of great focus.