Test#3
... 1. A measurement of the parallax of a star allows us directly to determine the star's a) rotation rate, b) temperature, c) distance, d) age 2. How much brighter would a star be if an observer moved from 3 to 1 parsec from the star? a) 3 times, b) 9 times, c) 27 times, d) 81 times 3. The difference b ...
... 1. A measurement of the parallax of a star allows us directly to determine the star's a) rotation rate, b) temperature, c) distance, d) age 2. How much brighter would a star be if an observer moved from 3 to 1 parsec from the star? a) 3 times, b) 9 times, c) 27 times, d) 81 times 3. The difference b ...
Planetarium Key Points
... Geographic Latitude is the elevation of the visible pole and, roughly, of Polaris The motion of the sphere seems uniform, for this reason it was the source for time telling, but the time scale that comes from is NOT uniform: rotation is slowing down, the day is longer and longer at the rate of 2 ...
... Geographic Latitude is the elevation of the visible pole and, roughly, of Polaris The motion of the sphere seems uniform, for this reason it was the source for time telling, but the time scale that comes from is NOT uniform: rotation is slowing down, the day is longer and longer at the rate of 2 ...
The Challenge of Distances (PowerPoint version)
... ‘protostar’ that is forming at the middle of the nebula. (Analogy: here in the Solar System, the light we get from Jupiter has a spectrum like the Sun: it’s reflected sunlight!) Anyway, they are so faint that astronomers couldn’t get a spectrum, which requires spreading out the light. So this approa ...
... ‘protostar’ that is forming at the middle of the nebula. (Analogy: here in the Solar System, the light we get from Jupiter has a spectrum like the Sun: it’s reflected sunlight!) Anyway, they are so faint that astronomers couldn’t get a spectrum, which requires spreading out the light. So this approa ...
The Life of a Star
... together into a sphere. • The sphere becomes dense and hot. • Nuclear fusion changes hydrogen to helium. ...
... together into a sphere. • The sphere becomes dense and hot. • Nuclear fusion changes hydrogen to helium. ...
File
... As we go through these slides, try to think what the root words aster and stell might mean. ...
... As we go through these slides, try to think what the root words aster and stell might mean. ...
TYPES OF STARS
... When astronomers look through their telescopes, they see billions of stars. What can they learn from their observations? In class, we’ve learned that the shape of the spectrum (especially, the wavelength at which it reaches its maximum intensity) can be used to determine a star’s temperature. In add ...
... When astronomers look through their telescopes, they see billions of stars. What can they learn from their observations? In class, we’ve learned that the shape of the spectrum (especially, the wavelength at which it reaches its maximum intensity) can be used to determine a star’s temperature. In add ...
HW #4 (due March 27)
... When astronomers look through their telescopes, they see billions of stars. What can they learn from their observations? In class, we’ve learned that the shape of the spectrum (especially, the wavelength at which it reaches its maximum intensity) can be used to determine a star’s temperature. In add ...
... When astronomers look through their telescopes, they see billions of stars. What can they learn from their observations? In class, we’ve learned that the shape of the spectrum (especially, the wavelength at which it reaches its maximum intensity) can be used to determine a star’s temperature. In add ...
Distances of the Stars
... A) They appear to move back and forth against the background stars because of the Earth’s motion around the Sun. B) They appear to be very bright, so must be close. C) They are occasionally eclipsed by our moon, so they must be close. ...
... A) They appear to move back and forth against the background stars because of the Earth’s motion around the Sun. B) They appear to be very bright, so must be close. C) They are occasionally eclipsed by our moon, so they must be close. ...
Thursday October 1 - Montana State University
... Compare absolute and apparent magnitudes • If we know the luminosity (or absolute magnitude) of a star, we can find its distance. • A star of known luminosity is called a standard candle. • More on this later... ...
... Compare absolute and apparent magnitudes • If we know the luminosity (or absolute magnitude) of a star, we can find its distance. • A star of known luminosity is called a standard candle. • More on this later... ...
A stars
... More massive, brighter stars have wider HZ. However, massive, bright stars are much more short-lived than smaller, stars. In the case of the massive O stars and B main sequence stars, these very objects race through their life-cycles in only a few tens of millions of years – too quickly to allow e ...
... More massive, brighter stars have wider HZ. However, massive, bright stars are much more short-lived than smaller, stars. In the case of the massive O stars and B main sequence stars, these very objects race through their life-cycles in only a few tens of millions of years – too quickly to allow e ...
Study Guide – Midterm 3
... We see both young and old clusters. Sun’s structure consistent with 4.5 billion yr age. ...
... We see both young and old clusters. Sun’s structure consistent with 4.5 billion yr age. ...
Review3-2016
... How do we use the atomic emission and absorption spectra to find the composition of a star? How do we determine the rotation period of a star? How do we determine the distance to a star using Stellar Parallax? What is an H-R diagram and what information does it give us? One of the Ca spectral lines ...
... How do we use the atomic emission and absorption spectra to find the composition of a star? How do we determine the rotation period of a star? How do we determine the distance to a star using Stellar Parallax? What is an H-R diagram and what information does it give us? One of the Ca spectral lines ...
ASTR 105 Intro Astronomy: The Solar System
... Our view from Stony Brook • Stars near the north celestial pole are circumpolar and never set. • We cannot see stars near the south celestial pole. • All other stars (and Sun, Moon, planets) rise in east and set in west. This star is up some of the time and down ...
... Our view from Stony Brook • Stars near the north celestial pole are circumpolar and never set. • We cannot see stars near the south celestial pole. • All other stars (and Sun, Moon, planets) rise in east and set in west. This star is up some of the time and down ...
Hertzsprung-Russell (H-R) Diagram Hertzsprung-Russell Diagram March 16 −
... Hot-plate model of star: L=R2T4 Model of the solar interior X How to read H-R Diagram Spectrum of black body: Hotter=>bluer Energy generation in the sun X ...
... Hot-plate model of star: L=R2T4 Model of the solar interior X How to read H-R Diagram Spectrum of black body: Hotter=>bluer Energy generation in the sun X ...
Today`s Class: Measuring temperatures of stars Astronomer`s
... • Most had studied astronomy, but were not allowed to work as scientists ...
... • Most had studied astronomy, but were not allowed to work as scientists ...
word document - FacStaff Home Page for CBU
... (questions similar to these may appear on the test) _____ a) The diameter of the sun is approximately 0.1% of the earth-sun distance. [Here "about" means within a factor of 5 either way.] _____ b) The nearest star is about 250,000 A.U. from the earth. [Here "about" means within a factor of 5 either ...
... (questions similar to these may appear on the test) _____ a) The diameter of the sun is approximately 0.1% of the earth-sun distance. [Here "about" means within a factor of 5 either way.] _____ b) The nearest star is about 250,000 A.U. from the earth. [Here "about" means within a factor of 5 either ...
Hertzsprung-Russell Diagram—key to understanding properties of stars. 26 Sept
... No, I did not see any differences between the stars. ...
... No, I did not see any differences between the stars. ...
CARBON STARS
... solar neighborhood (within a few 100 parsecs) • Seem to be more common than giants in this region ...
... solar neighborhood (within a few 100 parsecs) • Seem to be more common than giants in this region ...
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.