Properties of Stars
... run out of fuel and collapse due to gravity. Death of Low-Mass Stars • Stars less than one-half the mass of the sun never evolve to the red giant stage but remain in the stable main-sequence stage until they consume all their hydrogen fuel and collapse into a white dwarf. ...
... run out of fuel and collapse due to gravity. Death of Low-Mass Stars • Stars less than one-half the mass of the sun never evolve to the red giant stage but remain in the stable main-sequence stage until they consume all their hydrogen fuel and collapse into a white dwarf. ...
Spectral Variations of Several RV Tauri Type Stars Patrick Durant
... including AC Her, SX Her and V Vul. As is typical of this variable type, the stars show changes in spectral type and line strength in addition to changes in their light curve over time. Our group has acquired spectra of these stars during the past 10 years using the coude feed telescope at Kitt Peak ...
... including AC Her, SX Her and V Vul. As is typical of this variable type, the stars show changes in spectral type and line strength in addition to changes in their light curve over time. Our group has acquired spectra of these stars during the past 10 years using the coude feed telescope at Kitt Peak ...
Teacher Guide Lives of Stars
... This activity is an opportunity for students to learn about the fundamental characterisitcs of stars and their life cycles. Students perform a play as members of an interview with several different stars. As the play progresses, students develop an understanding of the most fundamental concepts in s ...
... This activity is an opportunity for students to learn about the fundamental characterisitcs of stars and their life cycles. Students perform a play as members of an interview with several different stars. As the play progresses, students develop an understanding of the most fundamental concepts in s ...
For instance, two hydrogen atoms may fuse together to form one
... Astronomers classify stars based on their age, color, and brightness. These characteris tics help them identify and understand the different kinds of stars. A star’s surface temperature determines the amount of visible light given off (its brightness) and the color we perceive the star to be. For ex ...
... Astronomers classify stars based on their age, color, and brightness. These characteris tics help them identify and understand the different kinds of stars. A star’s surface temperature determines the amount of visible light given off (its brightness) and the color we perceive the star to be. For ex ...
Our Star - the Sun
... The Sun’s surface features vary in an 11-year cycle This is related to a 22-year cycle in which the surface magnetic field increases, decreases, and then increases again with the opposite polarity The average number of sunspots increases and decreases in a regular cycle of approximately 11 years, wi ...
... The Sun’s surface features vary in an 11-year cycle This is related to a 22-year cycle in which the surface magnetic field increases, decreases, and then increases again with the opposite polarity The average number of sunspots increases and decreases in a regular cycle of approximately 11 years, wi ...
HW8 - UCSB Physics
... Using this let us first calculate the three requested figures. The given mass of the earth, the sun, and the black hole of NGC 4261 are 5.97 ×1024 kg, 1.99 ×1030 kg (1 M ), and 1.2 ×109 M , respectively. Direct substitution into the equation above gives the values (a),(b),(c) for the earth, the su ...
... Using this let us first calculate the three requested figures. The given mass of the earth, the sun, and the black hole of NGC 4261 are 5.97 ×1024 kg, 1.99 ×1030 kg (1 M ), and 1.2 ×109 M , respectively. Direct substitution into the equation above gives the values (a),(b),(c) for the earth, the su ...
LIGHT VS. DISTANCE
... Example: A 40 watt light bulb consumes 40 watts of electrical power, but most of this energy goes into HEAT energy. The remaining energy is converted to light. The unit used for light in this case is the “lumen”. A 40 watt bulb emits about 505 lumens of light. ...
... Example: A 40 watt light bulb consumes 40 watts of electrical power, but most of this energy goes into HEAT energy. The remaining energy is converted to light. The unit used for light in this case is the “lumen”. A 40 watt bulb emits about 505 lumens of light. ...
Homework 4 - UCLA Astronomy
... We're interested in a relation between the pulsar luminosity and its rotational period. In general, the kinetic energy of a rotating body is given by E=1/2 I 2 . Since we want this in terms of the rotational period, we can convert from omega to period: ...
... We're interested in a relation between the pulsar luminosity and its rotational period. In general, the kinetic energy of a rotating body is given by E=1/2 I 2 . Since we want this in terms of the rotational period, we can convert from omega to period: ...
Exam Study Guide
... 82. How is a white dwarf formed? 83. Why are bright blue stars an indicator of recent star formation? 84. Why are star clusters so useful in testing theories of stellar evolution? 85. What is the proper order of the following objects in terms of increasing size? brown dwarf, G-type main sequence sta ...
... 82. How is a white dwarf formed? 83. Why are bright blue stars an indicator of recent star formation? 84. Why are star clusters so useful in testing theories of stellar evolution? 85. What is the proper order of the following objects in terms of increasing size? brown dwarf, G-type main sequence sta ...
Star Life Cycle Review 1. What is the first stage of star creation? A
... A star's life cycle is similar to that of a living organism in which of the following ways? A star fits into an ecological niche within its galaxy. Each star competes with other stars for a limited amount A. of resources. B. A star requires a continual supply of material from other stars in order to ...
... A star's life cycle is similar to that of a living organism in which of the following ways? A star fits into an ecological niche within its galaxy. Each star competes with other stars for a limited amount A. of resources. B. A star requires a continual supply of material from other stars in order to ...
Interview With a White Dwarf – Teacher Guide
... Students should cover each of these six main topics in their story. For grading: each of these 6 topic is worth 10%, the overall quality and creativity of the story is worth 20%, and the plots (answers below) are worth 5% each. 1. What are the primary characteristics of a star? A star maintains a ba ...
... Students should cover each of these six main topics in their story. For grading: each of these 6 topic is worth 10%, the overall quality and creativity of the story is worth 20%, and the plots (answers below) are worth 5% each. 1. What are the primary characteristics of a star? A star maintains a ba ...
Binary Star Systems Discussion Points 1. What characteristic of a
... 8. What was the first spectroscopic binary star system every observed? 9. Give an example of another spectroscopic binary star system. 10. If the total brightness of a binary star system varies in a regular way over time, the system is an binary system. 11. How is the orbit of the 2 stars in the pre ...
... 8. What was the first spectroscopic binary star system every observed? 9. Give an example of another spectroscopic binary star system. 10. If the total brightness of a binary star system varies in a regular way over time, the system is an binary system. 11. How is the orbit of the 2 stars in the pre ...
ASTR 1050: Survey of Astronomy
... e. The number of protons and electrons must be the same for an atom to be neutral. 39. A question about some objects looked at during the observing lab. Which is not true? a. The rings of Jupiter are visible in a small telescope. b. Some of Jupiter's moons are visible in a small telescope. c. Some o ...
... e. The number of protons and electrons must be the same for an atom to be neutral. 39. A question about some objects looked at during the observing lab. Which is not true? a. The rings of Jupiter are visible in a small telescope. b. Some of Jupiter's moons are visible in a small telescope. c. Some o ...
![2-2 wkst - Home [www.petoskeyschools.org]](http://s1.studyres.com/store/data/009700019_1-9e7a7c15444658cfc76a04a9cf1ba291-300x300.png)
Type II supernova
A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star. A star must have at least 8 times, and no more than 40–50 times, the mass of the Sun (M☉) for this type of explosion. It is distinguished from other types of supernovae by the presence of hydrogen in its spectrum. Type II supernovae are mainly observed in the spiral arms of galaxies and in H II regions, but not in elliptical galaxies.Stars generate energy by the nuclear fusion of elements. Unlike the Sun, massive stars possess the mass needed to fuse elements that have an atomic mass greater than hydrogen and helium, albeit at increasingly higher temperatures and pressures, causing increasingly shorter stellar life spans. The degeneracy pressure of electrons and the energy generated by these fusion reactions are sufficient to counter the force of gravity and prevent the star from collapsing, maintaining stellar equilibrium. The star fuses increasingly higher mass elements, starting with hydrogen and then helium, progressing up through the periodic table until a core of iron and nickel is produced. Fusion of iron or nickel produces no net energy output, so no further fusion can take place, leaving the nickel-iron core inert. Due to the lack of energy output allowing outward pressure, equilibrium is broken.When the mass of the inert core exceeds the Chandrasekhar limit of about 1.4 M☉, electron degeneracy alone is no longer sufficient to counter gravity and maintain stellar equilibrium. A cataclysmic implosion takes place within seconds, in which the outer core reaches an inward velocity of up to 23% of the speed of light and the inner core reaches temperatures of up to 100 billion kelvin. Neutrons and neutrinos are formed via reversed beta-decay, releasing about 1046 joules (100 foes) in a ten-second burst. The collapse is halted by neutron degeneracy, causing the implosion to rebound and bounce outward. The energy of this expanding shock wave is sufficient to accelerate the surrounding stellar material to escape velocity, forming a supernova explosion, while the shock wave and extremely high temperature and pressure briefly allow for theproduction of elements heavier than iron. Depending on initial size of the star, the remnants of the core form a neutron star or a black hole. Because of the underlying mechanism, the resulting nova is also described as a core-collapse supernova.There exist several categories of Type II supernova explosions, which are categorized based on the resulting light curve—a graph of luminosity versus time—following the explosion. Type II-L supernovae show a steady (linear) decline of the light curve following the explosion, whereas Type II-P display a period of slower decline (a plateau) in their light curve followed by a normal decay. Type Ib and Ic supernovae are a type of core-collapse supernova for a massive star that has shed its outer envelope of hydrogen and (for Type Ic) helium. As a result, they appear to be lacking in these elements.