File - Mr. Catt`s Class
... 2. Look-back time is the time light from a distant object has traveled to reach us. 3. The look-back time complicates our interpretation of galaxies because the farther out we look, the earlier in time we are seeing them. – Our assumption that distant clusters are similar to nearby clusters may not ...
... 2. Look-back time is the time light from a distant object has traveled to reach us. 3. The look-back time complicates our interpretation of galaxies because the farther out we look, the earlier in time we are seeing them. – Our assumption that distant clusters are similar to nearby clusters may not ...
Astrophysics for Physicists.
... I had to teach the course Fundamentals of Astrophysics in our department, I found that there was no textbook which was suitable for use in the whole course. The present book has grown out of the material I have taught in this course. While writing this book, I have kept in mind that most of the stud ...
... I had to teach the course Fundamentals of Astrophysics in our department, I found that there was no textbook which was suitable for use in the whole course. The present book has grown out of the material I have taught in this course. While writing this book, I have kept in mind that most of the stud ...
- x sin a + ycos a = ad cos b
... for(X 0' Yo, Zol by the method (if least squares. From the outset, we recognize that it is not possible to make a single choice for (X 0, Yo, Zd that will solve everyone of equations (6-13) exactly. (This is true even for perfect data because the stellar velocity components can be set to zero only o ...
... for(X 0' Yo, Zol by the method (if least squares. From the outset, we recognize that it is not possible to make a single choice for (X 0, Yo, Zd that will solve everyone of equations (6-13) exactly. (This is true even for perfect data because the stellar velocity components can be set to zero only o ...
“XRbinary”: A Program to Calculate the Orbital Light Curves of X
... in ζ and a: (ζmin , ζmax , amin , amax ); and by its temperature, which is specified by the ratio Tspot /Tmain . Note that specifying the temperature this way means that the temperature varies from point to point within a spot as Tmain varies. If there is more than one spot and if the spots overlap, ...
... in ζ and a: (ζmin , ζmax , amin , amax ); and by its temperature, which is specified by the ratio Tspot /Tmain . Note that specifying the temperature this way means that the temperature varies from point to point within a spot as Tmain varies. If there is more than one spot and if the spots overlap, ...
Long-term monitoring of the short period SU UMa
... decrease during the course of the superoutburst before In order to examine whether V844 Her shows other the tidal instability was discovered (Haefner et al. 1979; types of superoutbursts, we extracted the observations Vogt 1983). The decrease of superhump period was as- reported to AAVSO and VSNET s ...
... decrease during the course of the superoutburst before In order to examine whether V844 Her shows other the tidal instability was discovered (Haefner et al. 1979; types of superoutbursts, we extracted the observations Vogt 1983). The decrease of superhump period was as- reported to AAVSO and VSNET s ...
Comprehensive Wide-Band Magnitudes and Albedos for the Planets
... band-passes. Furthermore, none of these works contain the Sloan magnitudes because those are being reported here for the first time. The purpose of this paper, therefore, is to provide a complete list of reference magnitudes for the two principal wide-band photometric regimes in use today, namely, t ...
... band-passes. Furthermore, none of these works contain the Sloan magnitudes because those are being reported here for the first time. The purpose of this paper, therefore, is to provide a complete list of reference magnitudes for the two principal wide-band photometric regimes in use today, namely, t ...
20_Testbank
... field shows thousands of galaxies in a very small angular area of the sky (about equal to the size of a grain of sand held at arm's length). Multiplying the number of galaxies by the ratio of the angular area of the entire sky to the angular area of the deep field then gives an estimate of the total ...
... field shows thousands of galaxies in a very small angular area of the sky (about equal to the size of a grain of sand held at arm's length). Multiplying the number of galaxies by the ratio of the angular area of the entire sky to the angular area of the deep field then gives an estimate of the total ...
Rigorous treatment of barycentric stellar motion
... of the epoch transformation developed by Lindegren (1995) and subsequently published in the Hipparcos catalogue (ESA 1997, Vol. 1, Sect. 1.5.5). With respect to the uniform rectilinear model it is semi-rigorous in the sense that light-time effects are ignored, as they could be shown to be negligible ...
... of the epoch transformation developed by Lindegren (1995) and subsequently published in the Hipparcos catalogue (ESA 1997, Vol. 1, Sect. 1.5.5). With respect to the uniform rectilinear model it is semi-rigorous in the sense that light-time effects are ignored, as they could be shown to be negligible ...
A Search for Extrasolar Planets Using Echoes Produced in Flare
... While radar uses a RF energy pulse, this method relies on a pulse of light emitted from the star. An implicit assumption is that the pulse of light propagates in all directions equally and simultaneously; that the pulse radiates isotropically. For the observer on Earth the pulse follows two paths: o ...
... While radar uses a RF energy pulse, this method relies on a pulse of light emitted from the star. An implicit assumption is that the pulse of light propagates in all directions equally and simultaneously; that the pulse radiates isotropically. For the observer on Earth the pulse follows two paths: o ...
TWO NEW LONG-PERIOD GIANT PLANETS FROM THE
... Moutou et al. 2015). An example of a Jupiter-analog planet orbiting a solar twin is presented in Bedell et al. (2015). While the Kepler mission has revolutionized exoplanetary science and provided a first estimate of the frequency of Earth-size planets in Earth-like orbits, long-term RV surveys compl ...
... Moutou et al. 2015). An example of a Jupiter-analog planet orbiting a solar twin is presented in Bedell et al. (2015). While the Kepler mission has revolutionized exoplanetary science and provided a first estimate of the frequency of Earth-size planets in Earth-like orbits, long-term RV surveys compl ...
Plotting the Rotation Curve of M31
... Plotting the Rotation Curve of M31: Answers Radii in arcminutes and kiloparsecs and peak frequencies and velocities are listed in the table on page 3. How can we calculate the velocity of an atom from looking at its spectrum? Answer: measure the wavelength or frequency shift in the emission/absorpt ...
... Plotting the Rotation Curve of M31: Answers Radii in arcminutes and kiloparsecs and peak frequencies and velocities are listed in the table on page 3. How can we calculate the velocity of an atom from looking at its spectrum? Answer: measure the wavelength or frequency shift in the emission/absorpt ...
disappearance of comet c/2010 x1 (elenin): gone with a whimper
... of amateur observers reported sightings of the comet (Gonzalez et al. 2011). Visual magnitudes of active comets, especially when reported by different observers using different instruments, are very difficult to interpret and so we have not used them in the present analysis. However, the amateur obse ...
... of amateur observers reported sightings of the comet (Gonzalez et al. 2011). Visual magnitudes of active comets, especially when reported by different observers using different instruments, are very difficult to interpret and so we have not used them in the present analysis. However, the amateur obse ...
Stellar Structure and Evolution
... intrinsic interest of the topic, the value of such a course is that it provides an illustration (within the syllabus in Aarhus, almost the first illustration) of the application of physics to “the real world” outside the laboratory. I am grateful to the students who have followed the course over the ...
... intrinsic interest of the topic, the value of such a course is that it provides an illustration (within the syllabus in Aarhus, almost the first illustration) of the application of physics to “the real world” outside the laboratory. I am grateful to the students who have followed the course over the ...
Homologous Stars: Simple Scaling Relations
... The case n = 0 corresponds to incompressible fluid, i.e. ρ = ρc = const, P = Pc θ, and it requires rewriting eq. (poly.6) in a different form. In this case pressure vanishes at the surface, but density is the same throughout the ”star”. This solution is a crude approximation to the interior structur ...
... The case n = 0 corresponds to incompressible fluid, i.e. ρ = ρc = const, P = Pc θ, and it requires rewriting eq. (poly.6) in a different form. In this case pressure vanishes at the surface, but density is the same throughout the ”star”. This solution is a crude approximation to the interior structur ...
Understanding the Astrophysics of Galaxy Evolution: the role of
... re-ionization of the Universe, their story is not central to our understanding of the formation of the main components of typical spirals and ellipticals in the nearby Universe. Today, we know that typical L∗ galaxies assemble at z = 2 to 3. These are the redshifts where star formation and black hol ...
... re-ionization of the Universe, their story is not central to our understanding of the formation of the main components of typical spirals and ellipticals in the nearby Universe. Today, we know that typical L∗ galaxies assemble at z = 2 to 3. These are the redshifts where star formation and black hol ...
Chapter 15 THE MILKY WAY IN RELATION TO OTHER GALAXIES
... Hodge’s value for hHII for the Galaxy is 2.35±0.05 kpc, which would be consistent with the Galaxy also being of type Sb. However, using other data hHII can also be estimated as 4.6±1.0 kpc (van der Kruit, 1987). Color is known to correlate with Hubble type, as discussed above. For the Galaxy we unfo ...
... Hodge’s value for hHII for the Galaxy is 2.35±0.05 kpc, which would be consistent with the Galaxy also being of type Sb. However, using other data hHII can also be estimated as 4.6±1.0 kpc (van der Kruit, 1987). Color is known to correlate with Hubble type, as discussed above. For the Galaxy we unfo ...
Astrobiology - Anatomy Atlases
... • Extremophiles and where does life exist on Earth - subsurface, deep oceans, oceans, land, atmosphere • Tour of habitable planets + moons of our solar system searching for life - Mars, Europa, Titan, Enceladus • Planetary protection ...
... • Extremophiles and where does life exist on Earth - subsurface, deep oceans, oceans, land, atmosphere • Tour of habitable planets + moons of our solar system searching for life - Mars, Europa, Titan, Enceladus • Planetary protection ...
tut35 Magnitudes
... Astronomical magnitudes are dimensionless values. They are the ratio of a star’s radiation, to that of some standard star. The standard star used is Vega. Thus, Vega has U = V = B = 0 values by definition so Vega has zero color indices. Bolometric magnitudes take into account all the radiation of a ...
... Astronomical magnitudes are dimensionless values. They are the ratio of a star’s radiation, to that of some standard star. The standard star used is Vega. Thus, Vega has U = V = B = 0 values by definition so Vega has zero color indices. Bolometric magnitudes take into account all the radiation of a ...
Stellar Oscillations Lecture Notes on Jørgen Christensen-Dalsgaard
... very many, stars pulsate in more complicated manners than the Cepheids. In many instances more than one mode of oscillation is excited simultaneously in a star; these modes may include both radial overtones, in addition to the fundamental, and nonradial modes, where the motion does not preserve sphe ...
... very many, stars pulsate in more complicated manners than the Cepheids. In many instances more than one mode of oscillation is excited simultaneously in a star; these modes may include both radial overtones, in addition to the fundamental, and nonradial modes, where the motion does not preserve sphe ...
Life - Anatomy Atlases
... • Extremophiles and where does life exist on Earth - subsurface, deep oceans, oceans, land, atmosphere • Tour of habitable planets + moons of our solar system searching for life - Mars, Europa, Titan, Enceladus • Planetary protection ...
... • Extremophiles and where does life exist on Earth - subsurface, deep oceans, oceans, land, atmosphere • Tour of habitable planets + moons of our solar system searching for life - Mars, Europa, Titan, Enceladus • Planetary protection ...
The Celestial Sphere CHAPTER 1
... motion was a good approximation. Furthermore, since a geocentric model maintains circular motion, it was very difficult to make any observational distinction between geocentric and heliocentric universes. (Parallax effects are far too small to be noticeable with the naked eye.) ...
... motion was a good approximation. Furthermore, since a geocentric model maintains circular motion, it was very difficult to make any observational distinction between geocentric and heliocentric universes. (Parallax effects are far too small to be noticeable with the naked eye.) ...
21. Galaxy Evolution Agenda The Monty Hall Problem/Paradox 21.1
... • We suspect that active galactic nuclei are powered by supermassive black holes that can exceed one billion solar masses. Observations of the rapid variability of active galactic nuclei tells us that their energy output comes from quite a small region, while Doppler shifts of orbiting gas clouds te ...
... • We suspect that active galactic nuclei are powered by supermassive black holes that can exceed one billion solar masses. Observations of the rapid variability of active galactic nuclei tells us that their energy output comes from quite a small region, while Doppler shifts of orbiting gas clouds te ...
the evolution of planetary systems with time
... Observations indicate that intermediate mass stars, binary stars, and stellar remnants often host planets; a full explanation of these systems requires an understanding of how planetary orbits evolve as their central stars lose mass. Motivated by these dynamical systems, this paper generalizes previ ...
... Observations indicate that intermediate mass stars, binary stars, and stellar remnants often host planets; a full explanation of these systems requires an understanding of how planetary orbits evolve as their central stars lose mass. Motivated by these dynamical systems, this paper generalizes previ ...
Velocity and Acceleration
... Sir Isaac Newton was able to show that these three laws are consequences of ...
... Sir Isaac Newton was able to show that these three laws are consequences of ...
Astronomy Chapter 17 – Galaxies A. Main Ideas 1. Discovering
... ⇒ All galaxies are extremely distant from Earth, the nearest is more than 150,000 light-year away. Few can be seen with the naked eye. In the Northern Hemisphere the galaxy M31 appears as a pale smudge in the constellation Andromeda. ⇒ In the 18th and 19 centuries astronomers began catalogue the obj ...
... ⇒ All galaxies are extremely distant from Earth, the nearest is more than 150,000 light-year away. Few can be seen with the naked eye. In the Northern Hemisphere the galaxy M31 appears as a pale smudge in the constellation Andromeda. ⇒ In the 18th and 19 centuries astronomers began catalogue the obj ...