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Where do chemical elements come from?
... hydrogen in stars. 3. Name the stellar process in which the fusion of hydrogen produces other elements. ...
... hydrogen in stars. 3. Name the stellar process in which the fusion of hydrogen produces other elements. ...
Model Atmosphere Results (Kurucz 1979, ApJS, 40, 1)
... comes from higher in the atmosphere where gas is cooler in general; lower Iν, Jν • Radiative equilibrium: lower Jν → lower T ...
... comes from higher in the atmosphere where gas is cooler in general; lower Iν, Jν • Radiative equilibrium: lower Jν → lower T ...
Stages 12 to 14
... trigger violent fusion, and the shells will expand again. This process will repeat itself, causing variations in the radius of the red giant. ...
... trigger violent fusion, and the shells will expand again. This process will repeat itself, causing variations in the radius of the red giant. ...
Answers
... like star has become a red giant. In a sun-like star, fusion stops at this point once the 4He has been exhausted, leaving a high temperature, degenerate core as a white dwarf star. The timescale of helium fusion in a sun-like star is about 10% of the hydrogen burning phase, for the sun about 109 yea ...
... like star has become a red giant. In a sun-like star, fusion stops at this point once the 4He has been exhausted, leaving a high temperature, degenerate core as a white dwarf star. The timescale of helium fusion in a sun-like star is about 10% of the hydrogen burning phase, for the sun about 109 yea ...
–1– Solutions to PH6820 Midterm 1. Define the following: molecular
... 1. Define the following: molecular cloud, molecular core, protostar. Include typical properties when necessary. A molecular cloud is a distinct, self-gravitating cloud comprised primarily of H2 and He. The sizes range from 10 M⊙ (for a dark globule) to 106 M⊙ for the most massive giant molecular clo ...
... 1. Define the following: molecular cloud, molecular core, protostar. Include typical properties when necessary. A molecular cloud is a distinct, self-gravitating cloud comprised primarily of H2 and He. The sizes range from 10 M⊙ (for a dark globule) to 106 M⊙ for the most massive giant molecular clo ...
Marcelo Borges Fernandes1, Michaela Kraus2, Jiri Kubát2
... Abstract: We report on the variation of the rapidly rotating SMC supergiant star LHA 115-S 23 (AzV 172) for which we found a decrease in effective temperature from 11000 K to 9000 K and a simultaneous increase in rotation velocity from 110 km/s to 150 km/s (the latter corresponding to 75% of its cri ...
... Abstract: We report on the variation of the rapidly rotating SMC supergiant star LHA 115-S 23 (AzV 172) for which we found a decrease in effective temperature from 11000 K to 9000 K and a simultaneous increase in rotation velocity from 110 km/s to 150 km/s (the latter corresponding to 75% of its cri ...
HR Diagram Explorer Worksheet
... Question 6: Use the results from the previous 5 questions to construct a “conceptual” HR Diagram. You simply want to draw arrows showing the direction in which variables are increasing. a) Draw in an arrow on the y axis showing the direction of increasing “intrinsic luminosity” of the stars. (This ...
... Question 6: Use the results from the previous 5 questions to construct a “conceptual” HR Diagram. You simply want to draw arrows showing the direction in which variables are increasing. a) Draw in an arrow on the y axis showing the direction of increasing “intrinsic luminosity” of the stars. (This ...
Chapter 13 The Life of a Star The Life of a Star Mass Is the Key The
... • Reason: Larger stars are more massive and have less surface gravity ...
... • Reason: Larger stars are more massive and have less surface gravity ...
Document
... – The luminosity depends on the surface area of the star (R2) and T 4 (from Stefan’s law). – Hence, the ratio of the radii of Betelgeuse and the Sun is: – R / R = (T / T )2 (L / L)1/2 = 370 – This corresponds to almost 2 AU – I.e., larger than the orbit of Mars (1.5 AU)! ...
... – The luminosity depends on the surface area of the star (R2) and T 4 (from Stefan’s law). – Hence, the ratio of the radii of Betelgeuse and the Sun is: – R / R = (T / T )2 (L / L)1/2 = 370 – This corresponds to almost 2 AU – I.e., larger than the orbit of Mars (1.5 AU)! ...
File - Physical Science
... other materials "clump" together to form larger masses, which attract further matter, and eventually will become massive enough to form stars. The remaining materials are then believed to form planets, and other planetary system objects. ...
... other materials "clump" together to form larger masses, which attract further matter, and eventually will become massive enough to form stars. The remaining materials are then believed to form planets, and other planetary system objects. ...
Answer
... Luminosity remains constant at about 1 Lsun until about 10,000 Myr when it suddenly (and briefly) increases to over 4500 Lsun. 2. Describe how the radius of this star changes with time. Radius remains constant at about 1 Rsun until about 10,000 Myr when it suddenly (and briefly) increases to over 20 ...
... Luminosity remains constant at about 1 Lsun until about 10,000 Myr when it suddenly (and briefly) increases to over 4500 Lsun. 2. Describe how the radius of this star changes with time. Radius remains constant at about 1 Rsun until about 10,000 Myr when it suddenly (and briefly) increases to over 20 ...
–1– 4. Energy transport in stars Stars are hotter at the centre, hence
... The situation is very different for degenerate stars such as white dwarfs. In such cases, the conduction by electrons is often much more efficient than the radiative transfer for the following two reasons. First, the mean free path of electrons is much larger, because the quantum cells of phase spac ...
... The situation is very different for degenerate stars such as white dwarfs. In such cases, the conduction by electrons is often much more efficient than the radiative transfer for the following two reasons. First, the mean free path of electrons is much larger, because the quantum cells of phase spac ...
ASTRONOMY 120: GALAXIES AND THE UNIVERSE HOMEWORK
... giant phase, • and that 74% of the original mass of the star is in the form of Hydrogen. There are a few different ways you could conceptualize this problem, so your procedure might be correct even if it doesn’t look exactly like this one. The length of the Sun’s red giant phase will be dictated by ...
... giant phase, • and that 74% of the original mass of the star is in the form of Hydrogen. There are a few different ways you could conceptualize this problem, so your procedure might be correct even if it doesn’t look exactly like this one. The length of the Sun’s red giant phase will be dictated by ...
Homework #8 Solutions - Department of Physics and Astronomy
... Problem 12-4: Find the distance in parsecs to a visual binary that consists of stars of absolute bolometric magnitudes of +5.0 and +2.0. The mean angular separation is 0.005”, and the observed orbital period is ten years. The stars obey the mass-luminosity relation, equations 125a, b, and c. What as ...
... Problem 12-4: Find the distance in parsecs to a visual binary that consists of stars of absolute bolometric magnitudes of +5.0 and +2.0. The mean angular separation is 0.005”, and the observed orbital period is ten years. The stars obey the mass-luminosity relation, equations 125a, b, and c. What as ...
Simon Goodwin
... Environments of young stars We observe stars in very different environments with factors of >105 in density (Taurus to the core of R136). ...
... Environments of young stars We observe stars in very different environments with factors of >105 in density (Taurus to the core of R136). ...
Nature template
... tracks. The ends of the tracks designate where the outer atmosphere becomes unbound by gravity against radiation pressure. In general, these tracks provide good concurrence with the Geneva models at the low mass end of the range 3. ...
... tracks. The ends of the tracks designate where the outer atmosphere becomes unbound by gravity against radiation pressure. In general, these tracks provide good concurrence with the Geneva models at the low mass end of the range 3. ...
Part 1: If a 10000 K blackbody has a wavelength of peak emission at
... 9. We observe a binary star system in which both stars have the same physical age. However, one of these stars is a 10 solar mass main sequence star while its companion is a 1 solar mass white dwarf. Explain what is odd about this system and provide a plausible explanation for this apparently parad ...
... 9. We observe a binary star system in which both stars have the same physical age. However, one of these stars is a 10 solar mass main sequence star while its companion is a 1 solar mass white dwarf. Explain what is odd about this system and provide a plausible explanation for this apparently parad ...
Astronomy 440
... be taken up in Astronomy 440; although there is a shorter version of the text dealing specifically with our topic of stellar astrophysics; the cost is not much less, and that one would not be able to serve (as this one does) as a potential text for Astronomy 450 as well. Homework There will be frequ ...
... be taken up in Astronomy 440; although there is a shorter version of the text dealing specifically with our topic of stellar astrophysics; the cost is not much less, and that one would not be able to serve (as this one does) as a potential text for Astronomy 450 as well. Homework There will be frequ ...
What is a Star? - Lisle CUSD 202
... explosion called a supernova. In a supernova, a massive shockwave is produced that blows away the outer layers of the star. ...
... explosion called a supernova. In a supernova, a massive shockwave is produced that blows away the outer layers of the star. ...
THE NAMING OF STARS AND THE STUDY OF PROTOSTARS D. R.
... To an outsider, it is hard to find a consistent logic in the names given to stars. In Particle Physics a similar situation arose in the 1960's and early 1970's, when a large number of new particles and resonances were discovered. Names were given to them in an almost random way, using both latin and ...
... To an outsider, it is hard to find a consistent logic in the names given to stars. In Particle Physics a similar situation arose in the 1960's and early 1970's, when a large number of new particles and resonances were discovered. Names were given to them in an almost random way, using both latin and ...
Lecture 4 Hydrostatic equilibrium
... the star. Hence changes that involve substantial losses or gains of energy can not take place on timescales shorter than ...
... the star. Hence changes that involve substantial losses or gains of energy can not take place on timescales shorter than ...