Death of Stars
... fusion of four Hydrogen nuclei to form a He nucleus and conversion of mass to energy The energy appears as K.E of the particles formed, high energy gamma rays and neutrinos The temperature of the star’s core ...
... fusion of four Hydrogen nuclei to form a He nucleus and conversion of mass to energy The energy appears as K.E of the particles formed, high energy gamma rays and neutrinos The temperature of the star’s core ...
Oct 06, 2001
... This is a” thinking” question: Star A appears brighter than Star B, but Star A actually gives off less energy than Star B. The apparent magnitude and absolute magnitudes for Star A are m = 1 and M = -2, respectively. Use this information to answer the following two questions. 13) Which of the follow ...
... This is a” thinking” question: Star A appears brighter than Star B, but Star A actually gives off less energy than Star B. The apparent magnitude and absolute magnitudes for Star A are m = 1 and M = -2, respectively. Use this information to answer the following two questions. 13) Which of the follow ...
Study Guide for 3RD Astronomy Exam
... Interpret the luminosity class of a star by naming the luminosity class (Table 59.1) and identifying if the star is in the “adult” phase or the “nursing home” phase of its evolution. ...
... Interpret the luminosity class of a star by naming the luminosity class (Table 59.1) and identifying if the star is in the “adult” phase or the “nursing home” phase of its evolution. ...
1 Introduction - High Point University
... they reach their peak brightness and begin to fade. They are only useful as distance indicators if it is possible to calibrate them—to relate their observed brightness profile to absolute magnitudes. Type I supernovae are very uniform—the light curves and spectra for Type I supernovae are all fairly ...
... they reach their peak brightness and begin to fade. They are only useful as distance indicators if it is possible to calibrate them—to relate their observed brightness profile to absolute magnitudes. Type I supernovae are very uniform—the light curves and spectra for Type I supernovae are all fairly ...
Final review - Physics and Astronomy
... From Cepheids in Milky Way star clusters (with known distances), it was found that period (days to weeks) is related to average luminosity. ...
... From Cepheids in Milky Way star clusters (with known distances), it was found that period (days to weeks) is related to average luminosity. ...
What units are used in astronomical photometry?
... Astrometry: Technological advances (including the Hubble Space Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 10 12 stars in our Galaxy. Space observations mad ...
... Astrometry: Technological advances (including the Hubble Space Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 10 12 stars in our Galaxy. Space observations mad ...
What is a Star?
... system that contains all stars in our solar system; 200 billion stars in the Milky Way • Constellations seen from Earth change during different seasons because the Earth is in a different place in space. – Analogy: a road trip from here to Montgomery: You see different cities on your trip just as yo ...
... system that contains all stars in our solar system; 200 billion stars in the Milky Way • Constellations seen from Earth change during different seasons because the Earth is in a different place in space. – Analogy: a road trip from here to Montgomery: You see different cities on your trip just as yo ...
M13 – The Great Hercules Cluster
... like a pinwheel. On a clear, dark summer night in the country, you can see a pale glow arching overhead from South to North. This is just the glow of that disk of a hundred billion stars seen edge-on. When we look at this band of light we are looking out along the plane of the galaxy. Surrounding th ...
... like a pinwheel. On a clear, dark summer night in the country, you can see a pale glow arching overhead from South to North. This is just the glow of that disk of a hundred billion stars seen edge-on. When we look at this band of light we are looking out along the plane of the galaxy. Surrounding th ...
12.4 Evolution of Stars More Massive than the Sun
... High-mass stars, like all stars, leave the Main Sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars – first a hydrogen shell, then a core burning helium to carbon, surrounded by helium- and hydrogen-burning shells. ...
... High-mass stars, like all stars, leave the Main Sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars – first a hydrogen shell, then a core burning helium to carbon, surrounded by helium- and hydrogen-burning shells. ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
... 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the magnitude system to describe how much fainter Spica is than Canopus, but I prefer to talk about fluxes instea ...
... 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the magnitude system to describe how much fainter Spica is than Canopus, but I prefer to talk about fluxes instea ...
Scales of the Universe
... X-ray emission from the Sun's corona The corona is so hot that it emits X-ray radiation Rotation period: about a month The middle rotates faster than the north or south. Corona has an emission line spectrum and a continuum spectrum (dust scattering of photospheric black body light). Some of the con ...
... X-ray emission from the Sun's corona The corona is so hot that it emits X-ray radiation Rotation period: about a month The middle rotates faster than the north or south. Corona has an emission line spectrum and a continuum spectrum (dust scattering of photospheric black body light). Some of the con ...
ph507lecnote06
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
Constellations and Distances to Stars
... • The constellation Ursa Major contains the group of stars commonly called the Big Dipper. • The Big Dipper is not a constellation itself, but an asterism, which is a distinctive group of stars. • Another famous asterism is the Little Dipper in the constellation Ursa Minor. • The most famous star in ...
... • The constellation Ursa Major contains the group of stars commonly called the Big Dipper. • The Big Dipper is not a constellation itself, but an asterism, which is a distinctive group of stars. • Another famous asterism is the Little Dipper in the constellation Ursa Minor. • The most famous star in ...
PPT Format - HubbleSOURCE
... a system of two objects in space (usually stars), which are so close that their gravitational interaction causes them to orbit around their common center of mass. ...
... a system of two objects in space (usually stars), which are so close that their gravitational interaction causes them to orbit around their common center of mass. ...
13 Space Photos To Remind You The Universe Is
... nebulae (like the Helix Nebula above) are actually the remains of stars that once looked a lot like our sun. These stars spend most of their lives turning hydrogen into helium in massive runaway nuclear fusion reactions in their cores. ...
... nebulae (like the Helix Nebula above) are actually the remains of stars that once looked a lot like our sun. These stars spend most of their lives turning hydrogen into helium in massive runaway nuclear fusion reactions in their cores. ...
Basics – II. Time, Magnitudes and Spectral types
... BC should have two extra months and be 445 days long, to bring the calendar back in line with the seasons). In the short-term, this works well, but three years and one leap year give an average year of 365.25 days, different from the tropical year by about 0.0078 days, so in a thousand years, you’re ...
... BC should have two extra months and be 445 days long, to bring the calendar back in line with the seasons). In the short-term, this works well, but three years and one leap year give an average year of 365.25 days, different from the tropical year by about 0.0078 days, so in a thousand years, you’re ...
PPT
... • Approx 3000 LY away • Central star T = 80,000 K • Spectral class O • Mass ~ 1 Msun • Radius ~ 0.65 Rsun ...
... • Approx 3000 LY away • Central star T = 80,000 K • Spectral class O • Mass ~ 1 Msun • Radius ~ 0.65 Rsun ...
The most important questions to study for the exam
... • Very high, about 30,000 K or hotter, hot enough to ionize most of the hydrogen atoms so they cannot absorb light in the Balmer series • Quite low, about 6000 K or less, cool enough that most of the hydrogen atoms are in the ground state, so they cannot absorb light in the Balmer series • Moderate ...
... • Very high, about 30,000 K or hotter, hot enough to ionize most of the hydrogen atoms so they cannot absorb light in the Balmer series • Quite low, about 6000 K or less, cool enough that most of the hydrogen atoms are in the ground state, so they cannot absorb light in the Balmer series • Moderate ...
Can you write numbers in scientific notation
... Do you know the surface temperature, total lifespan, and general composition of the Sun? How is the process of stellar parallax used to determine the distance to a star? Do you understand how the brightness of a star depends on the star’s luminosity and the distance an observer is away from the star ...
... Do you know the surface temperature, total lifespan, and general composition of the Sun? How is the process of stellar parallax used to determine the distance to a star? Do you understand how the brightness of a star depends on the star’s luminosity and the distance an observer is away from the star ...
Conceptobasico.pdf
... At this time, the object is at its maximum altitude in the sky. The altazimuth coordinates of an object are local coordinates. Stars very far south near the South Celestial Pole do not rise at all, and they remain unseen for observers in the north. As the Earth orbits the Sun, we see the Sun moving ...
... At this time, the object is at its maximum altitude in the sky. The altazimuth coordinates of an object are local coordinates. Stars very far south near the South Celestial Pole do not rise at all, and they remain unseen for observers in the north. As the Earth orbits the Sun, we see the Sun moving ...
The Solar Neighborhood
... Since brighter stars are designated with a smaller number for apparent magnitude, magnitudes are plotted in reverse order to put the brighter stars at the top. Investigating Stellar Evolution - For each cluster, identify the main sequence, and sketch in a line that follows the main sequence from its ...
... Since brighter stars are designated with a smaller number for apparent magnitude, magnitudes are plotted in reverse order to put the brighter stars at the top. Investigating Stellar Evolution - For each cluster, identify the main sequence, and sketch in a line that follows the main sequence from its ...
Corona Australis
Corona Australis /kɵˈroʊnə ɒˈstreɪlɨs/ or Corona Austrina /kɵˈroʊnə ɒˈstraɪnə/ is a constellation in the Southern Celestial Hemisphere. Its Latin name means ""southern crown"", and it is the southern counterpart of Corona Borealis, the northern crown. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The Ancient Greeks saw Corona Australis as a wreath rather than a crown and associated it with Sagittarius or Centaurus. Other cultures have likened the pattern to a turtle, ostrich nest, a tent, or even a hut belonging to a rock hyrax.Although fainter than its namesake, the oval- or horseshoe-shaped pattern of its brighter stars renders it distinctive. Alpha and Beta Coronae Australis are the two brightest stars with an apparent magnitude of around 4.1. Epsilon Coronae Australis is the brightest example of a W Ursae Majoris variable in the southern sky. Lying alongside the Milky Way, Corona Australis contains one of the closest star-forming regions to our Solar System—a dusty dark nebula known as the Corona Australis Molecular Cloud, lying about 430 light years away. Within it are stars at the earliest stages of their lifespan. The variable stars R and TY Coronae Australis light up parts of the nebula, which varies in brightness accordingly.