Fe I/Fe II ionization equilibrium in cool stars: NLTE versus LTE
... Abstract. Non-local thermodynamic equilibrium (NLTE) line formation for neutral and singlyionized iron is considered through a range of stellar parameters characteristic of cool stars. A comprehensive model atom for Fe I and Fe II is presented. Our NLTE calculations support the earlier conclusions t ...
... Abstract. Non-local thermodynamic equilibrium (NLTE) line formation for neutral and singlyionized iron is considered through a range of stellar parameters characteristic of cool stars. A comprehensive model atom for Fe I and Fe II is presented. Our NLTE calculations support the earlier conclusions t ...
PHYS3380_111115_bw - The University of Texas at Dallas
... into its final stages of evolution; at this time the star is AGB star characterized by a carbon-oxygen core, surrounded by a helium burning shell and a hydrogen burning shell. • For stars whose mass is greater than 2.25 M, the electrons in their cores are not degenerate at the time of helium igniti ...
... into its final stages of evolution; at this time the star is AGB star characterized by a carbon-oxygen core, surrounded by a helium burning shell and a hydrogen burning shell. • For stars whose mass is greater than 2.25 M, the electrons in their cores are not degenerate at the time of helium igniti ...
solar system
... amount of matter gives it very strong gravity. Gravity is a force of attraction between all objects in the universe. Gravity keeps the planets orbiting the Sun. It also keeps moons orbiting planets. ...
... amount of matter gives it very strong gravity. Gravity is a force of attraction between all objects in the universe. Gravity keeps the planets orbiting the Sun. It also keeps moons orbiting planets. ...
Astronomy Activity word document
... 3. As astronomers have studied galaxies in detail, they have determined that there is more than dust, stars, and systems. They currently believe that about ______ % of the matter in galaxies is called ____________________________. c. Click on Astronomy on the lower right hand side of the website. Yo ...
... 3. As astronomers have studied galaxies in detail, they have determined that there is more than dust, stars, and systems. They currently believe that about ______ % of the matter in galaxies is called ____________________________. c. Click on Astronomy on the lower right hand side of the website. Yo ...
Where Did the Elements Come From?
... • An explosion of unbelievable violence, before which all matter in the universe could fit on a pinhead. • Most scientists accept this model for the universe’s beginning • When the universe had expanded and cooled enough the electrons, protons, and neutrons that were formed came together to form hyd ...
... • An explosion of unbelievable violence, before which all matter in the universe could fit on a pinhead. • Most scientists accept this model for the universe’s beginning • When the universe had expanded and cooled enough the electrons, protons, and neutrons that were formed came together to form hyd ...
Solar System World Book at NASA A solar system is a group of
... because they originally formed from this flattened disk. Most of the material in the solar nebula, however, was pulled toward the center and formed the sun. According to the theory, the pressure at the center became great enough to trigger the nuclear reactions that power the sun. Eventually, solar ...
... because they originally formed from this flattened disk. Most of the material in the solar nebula, however, was pulled toward the center and formed the sun. According to the theory, the pressure at the center became great enough to trigger the nuclear reactions that power the sun. Eventually, solar ...
Honors Question – Black Holes and Neutron Stars In Friday`s lecture
... neutrons packed tightly together like marbles. In other words, a neutron star is essentially a giant neutron-only nucleus. It is held to a certain size by the Pauli Exclusion Principle of quantum mechanics, which says that two identical neutrons cannot occupy the same space. The theory of neutron st ...
... neutrons packed tightly together like marbles. In other words, a neutron star is essentially a giant neutron-only nucleus. It is held to a certain size by the Pauli Exclusion Principle of quantum mechanics, which says that two identical neutrons cannot occupy the same space. The theory of neutron st ...
Integrative Studies 410 Our Place in the Universe
... • But: only 300,000 times the Earth mass! • Conclusion: the Sun is made from material that is 5 times lighter than the stuff the Earth is made of! ...
... • But: only 300,000 times the Earth mass! • Conclusion: the Sun is made from material that is 5 times lighter than the stuff the Earth is made of! ...
Sun ECBAD - University of Arizona
... Name:__SOLUTIONS______ _________ Section:___ NatSci102 In-Class Exercise This tutorial will give you a better understanding of the size of the Milky Way Galaxy by investigating the distances to objects within the Galaxy and to other objects in the Universe. Below is a picture of a spiral galaxy. Thi ...
... Name:__SOLUTIONS______ _________ Section:___ NatSci102 In-Class Exercise This tutorial will give you a better understanding of the size of the Milky Way Galaxy by investigating the distances to objects within the Galaxy and to other objects in the Universe. Below is a picture of a spiral galaxy. Thi ...
30-1
... _____ 3. What are spectrographs? a. devices that separate light into different colors b. devices that separate light into different gases c. graphs that separate light into different spectra d. devices that gather light into different spectra _____ 4. What does a star’s dark-line spectrum reveal? a. ...
... _____ 3. What are spectrographs? a. devices that separate light into different colors b. devices that separate light into different gases c. graphs that separate light into different spectra d. devices that gather light into different spectra _____ 4. What does a star’s dark-line spectrum reveal? a. ...
Faux Final
... Use separate sheets for the answers to these 20 questions. This test is never due. 1) Make a table with four columns. Fill it out with column headings: (1) approximate age of the moon in days, where new = 0 days, (2) name of the lunar phase, (3) a sketch of the appearance of the lit portion of the l ...
... Use separate sheets for the answers to these 20 questions. This test is never due. 1) Make a table with four columns. Fill it out with column headings: (1) approximate age of the moon in days, where new = 0 days, (2) name of the lunar phase, (3) a sketch of the appearance of the lit portion of the l ...
Solar Observing Curriculum Guide
... i. Inclement weather preventing a second observation. ii. It is rare, but possible that students might only see sunspots at the Sun’s fringes, which prevents accurate observations (due to the Sun’s spherical nature, and this lesson does not assume a knowledge of trigonometry). Taking path 4a is reco ...
... i. Inclement weather preventing a second observation. ii. It is rare, but possible that students might only see sunspots at the Sun’s fringes, which prevents accurate observations (due to the Sun’s spherical nature, and this lesson does not assume a knowledge of trigonometry). Taking path 4a is reco ...
Stellar Evolu1on Stars spend most of their lives on the main
... Stars expand and become more luminous while on the main-‐sequence -‐> the conversion of hydrogen into helium changes the chemical composi,on in the core. According to the ideal gas law (see on-‐line ...
... Stars expand and become more luminous while on the main-‐sequence -‐> the conversion of hydrogen into helium changes the chemical composi,on in the core. According to the ideal gas law (see on-‐line ...
Welcome to Science!
... ASTRONOMERS CAN: • Recall important information about the structure of our UNIVERSE in order to prepare for our End of Course Exam (May ...
... ASTRONOMERS CAN: • Recall important information about the structure of our UNIVERSE in order to prepare for our End of Course Exam (May ...
TY Course Day 1 Tuesday 25 Sept 12 v1
... In roughly 5 billion years, the Sun will cool and balloon outwards to many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and finally leaving behind a stellar remnant known as a white ...
... In roughly 5 billion years, the Sun will cool and balloon outwards to many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and finally leaving behind a stellar remnant known as a white ...
Modeling the Night Sky
... (revolves around) the Sun. Some constellations are small, while others are large. The Sun appears to move from one constellation to another in as few as 6 days or as many as 43. Add more celestial objects to your model by handing planet cards to more students. These objects orbit the Sun like Earth, ...
... (revolves around) the Sun. Some constellations are small, while others are large. The Sun appears to move from one constellation to another in as few as 6 days or as many as 43. Add more celestial objects to your model by handing planet cards to more students. These objects orbit the Sun like Earth, ...
Supernovae
... several models were proposed in the past, there is now agreement that Type I (or at least the subtype Ia) is due to the thermonuclear disruption of white dwarfs. White dwarfs form at the end of the evolution of stars whose original masses are less than 8 M (M = solar mass). A star can lose a large ...
... several models were proposed in the past, there is now agreement that Type I (or at least the subtype Ia) is due to the thermonuclear disruption of white dwarfs. White dwarfs form at the end of the evolution of stars whose original masses are less than 8 M (M = solar mass). A star can lose a large ...
EDU 290 Powerpoint
... A star is a huge, shining ball in space that produces a large amount of light and energy. Stars come in many sizes. About 75% are apart of groups that orbit each other. They are grouped in large structures called galaxies. (Milky Way). Stars have life-cycles like humans. A stars color depends on sur ...
... A star is a huge, shining ball in space that produces a large amount of light and energy. Stars come in many sizes. About 75% are apart of groups that orbit each other. They are grouped in large structures called galaxies. (Milky Way). Stars have life-cycles like humans. A stars color depends on sur ...
The life-cycle of stars - Young Scientists Journal
... rise as the atoms are crushed together. The repulsive force between the nuclei overcomes gravity and the core recoils out in what we see as a supernova. As the shock wave hits material in the star’s outer layers the material is heated, fusing to form further elements. All heavy elements, including u ...
... rise as the atoms are crushed together. The repulsive force between the nuclei overcomes gravity and the core recoils out in what we see as a supernova. As the shock wave hits material in the star’s outer layers the material is heated, fusing to form further elements. All heavy elements, including u ...
History of the Universe, Solar System, and Planets
... Evidence of Big Bang Theory • The universe is expanding (red shift or blue shift– based on Doppler premise) • Background radiation in universe ...
... Evidence of Big Bang Theory • The universe is expanding (red shift or blue shift– based on Doppler premise) • Background radiation in universe ...
Lecture 8: The Stars - Department of Physics and Astronomy
... Pioneers of Stellar Classification A better classification scheme was found by Annie Jump Canon, who joined the “computers” in 1896. Found that stars come in a “natural sequence”. The current scheme of O, B, A, F, G, K, M resulted from Canon revising Fleming’s work. Canon went on to classify 400, ...
... Pioneers of Stellar Classification A better classification scheme was found by Annie Jump Canon, who joined the “computers” in 1896. Found that stars come in a “natural sequence”. The current scheme of O, B, A, F, G, K, M resulted from Canon revising Fleming’s work. Canon went on to classify 400, ...