Document
... Spectroscopy is a tool of astronomy in which the light produced by a star or other object (called its spectrum) is analyzed. ...
... Spectroscopy is a tool of astronomy in which the light produced by a star or other object (called its spectrum) is analyzed. ...
Objects Beyond our Solar System
... Neutron stars are the ultra dense cores left behind when a large sun comes to the end of its life and explodes. The outside of the star is blown outward but the core that is left behind collapses in on itself and creates an incredibly dense mass of material. The core of a neutron star is so dens ...
... Neutron stars are the ultra dense cores left behind when a large sun comes to the end of its life and explodes. The outside of the star is blown outward but the core that is left behind collapses in on itself and creates an incredibly dense mass of material. The core of a neutron star is so dens ...
4 x What Powers the Sun? • Need to provide
... • Transparent gas layer, reaches 2000-3000 km above ...
... • Transparent gas layer, reaches 2000-3000 km above ...
Motions of the Stars
... • Motion of the Sun through nearby space (towards the constellation of Hercules) • Local rotation of the Milky Way galaxy ...
... • Motion of the Sun through nearby space (towards the constellation of Hercules) • Local rotation of the Milky Way galaxy ...
Exploring the Universe
... 2. Main-Sequence Stars a. Main sequence: A line or sequence in an H-R diagram where most stars spend 90% of their life. i. A diagonal band running from the bright, hot stars on the upper left to the dim, cool stars on the lower right ii. Example: The Sun lies in the main sequence iii. The sun is a ...
... 2. Main-Sequence Stars a. Main sequence: A line or sequence in an H-R diagram where most stars spend 90% of their life. i. A diagonal band running from the bright, hot stars on the upper left to the dim, cool stars on the lower right ii. Example: The Sun lies in the main sequence iii. The sun is a ...
Current Study Guide - Department of Physics and Astronomy
... Where are most stars found on the H-R Diagram? Why are Stars spherical? What is the most fundamental of all stellar properties? A star spends most of its lifetime undergoing what process? A pulsar is believed to be what kind of object? Where were the heavy elements in our bodies formed? The turn-off ...
... Where are most stars found on the H-R Diagram? Why are Stars spherical? What is the most fundamental of all stellar properties? A star spends most of its lifetime undergoing what process? A pulsar is believed to be what kind of object? Where were the heavy elements in our bodies formed? The turn-off ...
April 1st
... • Not enough mass for fusion • Minimum mass of gas need for fusion is 0.08 solar masses (80 times the mass of Jupiter) ...
... • Not enough mass for fusion • Minimum mass of gas need for fusion is 0.08 solar masses (80 times the mass of Jupiter) ...
Notes
... E. _________________________ holds the solar system together 1. We usually think of gravity as the ____________________ that pulls us to the Earth. 2. True definition of gravity is the attractive force between ____________. 3. The more _________ an object has the ________ its gravitational pull. a. ...
... E. _________________________ holds the solar system together 1. We usually think of gravity as the ____________________ that pulls us to the Earth. 2. True definition of gravity is the attractive force between ____________. 3. The more _________ an object has the ________ its gravitational pull. a. ...
LIfe of a Star
... Dwarf small hot star that is the leftover center of an older star Final stage Can shine for billions of years before they extinguish Observe life of a star (link) ...
... Dwarf small hot star that is the leftover center of an older star Final stage Can shine for billions of years before they extinguish Observe life of a star (link) ...
The Stars
... • Why is a blue star more luminous than a yellow star of the same size? • What does the H-R diagram show us about most stars (main sequence stars)? • What are red giants and white dwarf stars? • What is the mass-luminosity relationship? ...
... • Why is a blue star more luminous than a yellow star of the same size? • What does the H-R diagram show us about most stars (main sequence stars)? • What are red giants and white dwarf stars? • What is the mass-luminosity relationship? ...
Exercise 9
... Introduction: By looking at an apparently flat background of stars at night or at a star chart printed on a page, we often forget about the three-dimensional nature of the universe. In this exercise, you will construct (with welding rods and Styrofoam balls) a model of nearby space including many of ...
... Introduction: By looking at an apparently flat background of stars at night or at a star chart printed on a page, we often forget about the three-dimensional nature of the universe. In this exercise, you will construct (with welding rods and Styrofoam balls) a model of nearby space including many of ...
- hoganshomepage
... Spectroscope: Used to measure the chemical composition of the stars. (also temperature and direction the star is moving in relation to the Earth.) How? Set up a spectroscope with different tubes; each gas has different spectras – light patterns. ...
... Spectroscope: Used to measure the chemical composition of the stars. (also temperature and direction the star is moving in relation to the Earth.) How? Set up a spectroscope with different tubes; each gas has different spectras – light patterns. ...
The Mass-Luminosity Relationship and Stellar Lifetimes
... • Our intuition would seem to say that since big stars have a lot more fuel to consume, they should last a lot longer than smaller stars. • It doesn’t work this way, however. If the luminosity of a star increases with the 4th power of the mass, that means that the star is producing energy and using ...
... • Our intuition would seem to say that since big stars have a lot more fuel to consume, they should last a lot longer than smaller stars. • It doesn’t work this way, however. If the luminosity of a star increases with the 4th power of the mass, that means that the star is producing energy and using ...
Study Guide for the 4TH Astronomy Exam
... a. Describe how shell fusion in a star causes the star to become giants. b. Identify the “ashes” of H-burning and He-burning 4. Mass loss and Death of Low-Mass Stars a. Match the stage of the Sun’s future evolution with the mechanism of energy production in that stage. b. Identify on an HR diagram t ...
... a. Describe how shell fusion in a star causes the star to become giants. b. Identify the “ashes” of H-burning and He-burning 4. Mass loss and Death of Low-Mass Stars a. Match the stage of the Sun’s future evolution with the mechanism of energy production in that stage. b. Identify on an HR diagram t ...
1_Introduction
... Gravity makes the Moon orbit the Earth. It makes planets orbit the Sun. What does it do on larger scales? ...
... Gravity makes the Moon orbit the Earth. It makes planets orbit the Sun. What does it do on larger scales? ...
“Contact” Movie Notes
... Just before Ellie is dropped out of the machine, she sees a group of shiny lights shooting across the sky. What do you think this could be? _________________________________________________________________________ ...
... Just before Ellie is dropped out of the machine, she sees a group of shiny lights shooting across the sky. What do you think this could be? _________________________________________________________________________ ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.