Lecture 11, PPT version
... (Astronomers like to classify things / put them in bins) The letters O, B, A, F, G, K, M are called the “spectral type” of the star and describe the appearance of the spectrum (i.e., strong helium lines but weak hydrogen lines, strong hydrogen lines but no helium lines). ...
... (Astronomers like to classify things / put them in bins) The letters O, B, A, F, G, K, M are called the “spectral type” of the star and describe the appearance of the spectrum (i.e., strong helium lines but weak hydrogen lines, strong hydrogen lines but no helium lines). ...
Planisphere
... actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfills the opposite role: it tells us how to find something in the sky at a given time at a particular location. If somehow we could convert between these systems, we could loo ...
... actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfills the opposite role: it tells us how to find something in the sky at a given time at a particular location. If somehow we could convert between these systems, we could loo ...
The cosmic distance scale
... Earlier it was mentioned that all SN Ia ought to have the same absolute magnitude because the white dwarf star of the system explodes when it reaches a certain mass (which applies everywhere in the universe). This is however not exactly true, different white dwarfs have different atmospheric composi ...
... Earlier it was mentioned that all SN Ia ought to have the same absolute magnitude because the white dwarf star of the system explodes when it reaches a certain mass (which applies everywhere in the universe). This is however not exactly true, different white dwarfs have different atmospheric composi ...
Astronomy - Test 3
... 1. The age of a cluster of stars is normally determined by A) Counting the number of white dwarfs in the cluster B) Measuring the number of giant stars C) Radioactive dating of material from the stars D) Counting the number of still living stars E) Measuring the “turnoff point” where stars leave the ...
... 1. The age of a cluster of stars is normally determined by A) Counting the number of white dwarfs in the cluster B) Measuring the number of giant stars C) Radioactive dating of material from the stars D) Counting the number of still living stars E) Measuring the “turnoff point” where stars leave the ...
Life Histories Of Some Stars
... Temperatures in the cores of large stars are much higher than the core temperatures of smaller stars. The higher the temperature inside a star, the faster hydrogen nuclei move. And the faster hydrogen nuclei move, the more likely it is that two nuclei will hit each other and fuse. So even though lar ...
... Temperatures in the cores of large stars are much higher than the core temperatures of smaller stars. The higher the temperature inside a star, the faster hydrogen nuclei move. And the faster hydrogen nuclei move, the more likely it is that two nuclei will hit each other and fuse. So even though lar ...
Astrophysics - Part 2
... Classification by luminosity Relation between brightness and apparent magnitude. Apparent magnitude, m Relation between intensity and apparent magnitude. Measurement of m from photographic plates and distinction between photographic and visual magnitude not required. Absolute magnitude, M Parsec and ...
... Classification by luminosity Relation between brightness and apparent magnitude. Apparent magnitude, m Relation between intensity and apparent magnitude. Measurement of m from photographic plates and distinction between photographic and visual magnitude not required. Absolute magnitude, M Parsec and ...
Life Histories Of Some Stars
... move. And the faster hydrogen nuclei move, the more likely it is that two nuclei will hit each other and fuse. So even though larger stars have more hydrogen reserves, they fuse hydrogen into helium at a much higher rate. This explains why large stars don’t spend much time as main sequence stars (co ...
... move. And the faster hydrogen nuclei move, the more likely it is that two nuclei will hit each other and fuse. So even though larger stars have more hydrogen reserves, they fuse hydrogen into helium at a much higher rate. This explains why large stars don’t spend much time as main sequence stars (co ...
Life Histories Stars
... Temperatures in the cores of large stars are much higher than the core temperatures of smaller stars. The higher the temperature inside a star, the faster hydrogen nuclei move. And the faster hydrogen nuclei move, the more likely it is that two nuclei will hit each other and fuse. So even though lar ...
... Temperatures in the cores of large stars are much higher than the core temperatures of smaller stars. The higher the temperature inside a star, the faster hydrogen nuclei move. And the faster hydrogen nuclei move, the more likely it is that two nuclei will hit each other and fuse. So even though lar ...
A Study of the Spectroscopic Variability of Select RV Tauri... Charles Kurgatt , Donald K. Walter , Steve Howell
... RV Tauri and Semi-Regular stars are examples of variable stars, a star that is unable to maintain a steady apparent brightness. These changes in brightness may have many causes such as eclipses, stellar rotation, and pulsation. The two types studied here vary in brightness due to pulsations in the p ...
... RV Tauri and Semi-Regular stars are examples of variable stars, a star that is unable to maintain a steady apparent brightness. These changes in brightness may have many causes such as eclipses, stellar rotation, and pulsation. The two types studied here vary in brightness due to pulsations in the p ...
Earth_Universe04
... • Apparent magnitude • Brightness when a star is viewed from Earth • Decreases with distance • Numbers are used to designate magnitudes dim stars have large numbers and negative numbers are also used ...
... • Apparent magnitude • Brightness when a star is viewed from Earth • Decreases with distance • Numbers are used to designate magnitudes dim stars have large numbers and negative numbers are also used ...
Chapter 24
... • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is less than one second of arc ...
... • Apparent shift in a star's position due to the orbital motion of Earth • Measured as an angle • Near stars have the largest parallax • Largest parallax is less than one second of arc ...
Return both exam and scantron sheet when you
... 26. Typical sizes of main sequence stars (in units of solar radius R⊙ ) are (a) from 0.01 R⊙ to 0.1 R⊙ . (b) from 100 R⊙ to 1000 R⊙ . (c) from 10 R⊙ to 100 R⊙ . (d) [None of the above.] 27. When a star’s light passes through its cooler atmosphere (a) new spectral lines appear in the spectrum. (b) ph ...
... 26. Typical sizes of main sequence stars (in units of solar radius R⊙ ) are (a) from 0.01 R⊙ to 0.1 R⊙ . (b) from 100 R⊙ to 1000 R⊙ . (c) from 10 R⊙ to 100 R⊙ . (d) [None of the above.] 27. When a star’s light passes through its cooler atmosphere (a) new spectral lines appear in the spectrum. (b) ph ...
Life on the Main Sequence + Expansion to Red Giant
... Example: HR diagram of the star cluster M3 ...
... Example: HR diagram of the star cluster M3 ...
The Milky Way - Computer Science Technology
... V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
... V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
Chapter 2 User`s Guide to the Sky
... V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
... V. Astronomical Influences on Earth's Climate A. The Hypothesis B. The Evidence ...
The Dramatic Lives of Stars
... A. Grows and heats up as it ages B. Grows and cools as it ages C. Shrinks and heats up as it ages D. Shrinks and cools as it ages ...
... A. Grows and heats up as it ages B. Grows and cools as it ages C. Shrinks and heats up as it ages D. Shrinks and cools as it ages ...
Review of the Principles of Stellar Parallax and Practice Problems
... Practice Problem 3: Star 1 has an absolute magnitude of 0. How many times more luminous is star 1 compared to the Sun? Note: the absolute magnitude of the Sun is +4.8. ...
... Practice Problem 3: Star 1 has an absolute magnitude of 0. How many times more luminous is star 1 compared to the Sun? Note: the absolute magnitude of the Sun is +4.8. ...
Stars I - Astronomy Centre
... Seminar Quiz (Stars III) • Why, apart from the Sun, can we only measure reliable masses for stars in binary systems? • Sirius, the brightest star in the sky, has a parallax of 0.379 arcseconds. What is its distance in parsecs? In light years? • Sirius is 22 times more luminous than the Sun; Polaris ...
... Seminar Quiz (Stars III) • Why, apart from the Sun, can we only measure reliable masses for stars in binary systems? • Sirius, the brightest star in the sky, has a parallax of 0.379 arcseconds. What is its distance in parsecs? In light years? • Sirius is 22 times more luminous than the Sun; Polaris ...
Study Guide
... Post-Main Sequence Evolution of a High Mass Star • End of the Life of a Massive Star: – Burn H through Si in successive cores – Finally build a massive Iron core ...
... Post-Main Sequence Evolution of a High Mass Star • End of the Life of a Massive Star: – Burn H through Si in successive cores – Finally build a massive Iron core ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.