Chapter 5 Notes
... collection of stars, gas, and dust 1. Earth galaxy is Milky Way which is part of a galaxy cluster named the ______ _____. 2. _______ _______ - spiral arms wind out from inner section; some have barred spirals with stars and gas in a central bar 3. _______ _________ - large, three-dimensional ...
... collection of stars, gas, and dust 1. Earth galaxy is Milky Way which is part of a galaxy cluster named the ______ _____. 2. _______ _______ - spiral arms wind out from inner section; some have barred spirals with stars and gas in a central bar 3. _______ _________ - large, three-dimensional ...
Last Year`s Exam, Section B
... Explain why very bright main-sequence stars like θ1 Orionis C are always found in or near star formation regions, whereas less bright main-sequence stars like the Sun can be found anywhere. Brighter main-sequence stars are more massive. Luminosity increases much faster than mass: a star 10 times ...
... Explain why very bright main-sequence stars like θ1 Orionis C are always found in or near star formation regions, whereas less bright main-sequence stars like the Sun can be found anywhere. Brighter main-sequence stars are more massive. Luminosity increases much faster than mass: a star 10 times ...
HW #8 Answers (Due 10/21)
... Cloud collision with spiral arms – As molecular clouds orbit in a spiral galaxy they pass they periodically pass through an over density of gas which is related to the spiral density wave in the galaxy. When this happens, the interaction between the cloud and the spiral density wave can compress a c ...
... Cloud collision with spiral arms – As molecular clouds orbit in a spiral galaxy they pass they periodically pass through an over density of gas which is related to the spiral density wave in the galaxy. When this happens, the interaction between the cloud and the spiral density wave can compress a c ...
Circumpolar constellations
... Is there a direction you could look any clear night, no matter what time of year, and always see the same stars? Yes! Circumpolar constellations do not rise or set, but appear to move in a series of circles around Polaris, the pole star. In the northern hemisphere, between 30 and 40 degrees North la ...
... Is there a direction you could look any clear night, no matter what time of year, and always see the same stars? Yes! Circumpolar constellations do not rise or set, but appear to move in a series of circles around Polaris, the pole star. In the northern hemisphere, between 30 and 40 degrees North la ...
Math 111: Logarithm Scales
... where M0 is a very rough estimate of the seismic energy of an earthquake (in dynes-cm). (a) The Kern County earthquake of 1952 released about 2 × 1027 dyne-cm of seismic energy. What was the moment magnitude of the Kern County earthquake? (b) The El Centro earthquake of 1940 had a moment magnitude o ...
... where M0 is a very rough estimate of the seismic energy of an earthquake (in dynes-cm). (a) The Kern County earthquake of 1952 released about 2 × 1027 dyne-cm of seismic energy. What was the moment magnitude of the Kern County earthquake? (b) The El Centro earthquake of 1940 had a moment magnitude o ...
1 pracovni list HR diagram I EN
... the parallax in the catalogue is in arc milliseconds. Mark the new column as r. Absolute magnitude M can be calculated using the formula M = m + 5 ⋅ [1 − log(r )], where apparent magnitude m is in column Vmag. Mark the new column as M. What values reach the parallax π (column Plx) in the HIPPARCOS C ...
... the parallax in the catalogue is in arc milliseconds. Mark the new column as r. Absolute magnitude M can be calculated using the formula M = m + 5 ⋅ [1 − log(r )], where apparent magnitude m is in column Vmag. Mark the new column as M. What values reach the parallax π (column Plx) in the HIPPARCOS C ...
astrocoursespring2012lec4
... instruments to resolve at Class V. And yet, and yet… It’s still a Messier, and that means g-o-o-d. If nothing else, this one provides a welcome break when you tire of observing yet another faint fuzzie in Coma - Virgo. You do need 8-inches of aperture before M53 begins to look like much, but when yo ...
... instruments to resolve at Class V. And yet, and yet… It’s still a Messier, and that means g-o-o-d. If nothing else, this one provides a welcome break when you tire of observing yet another faint fuzzie in Coma - Virgo. You do need 8-inches of aperture before M53 begins to look like much, but when yo ...
Part 3
... the light curve is not equal causes： 1 Asymmetry of the common envelope 2 Stellar dark spots model 3 Hot spots model problems： 1 We don’t know which mechanism is dominant 2 We don’t know the reason(s) which caused the O’connell effect type changes ...
... the light curve is not equal causes： 1 Asymmetry of the common envelope 2 Stellar dark spots model 3 Hot spots model problems： 1 We don’t know which mechanism is dominant 2 We don’t know the reason(s) which caused the O’connell effect type changes ...
PS 224, Fall 2014 HW 4
... 3. Future Skies. As a red giant, the Sun will have an angular size in Earth’s sky of about 30°. What will sunset and sunrise be like? Do you think the color of the sky will be different from what it is today? Explain. The Sun will have an angular size of 30°. The setting position moves through the ...
... 3. Future Skies. As a red giant, the Sun will have an angular size in Earth’s sky of about 30°. What will sunset and sunrise be like? Do you think the color of the sky will be different from what it is today? Explain. The Sun will have an angular size of 30°. The setting position moves through the ...
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please
... Scheat ( Pegasi) is a star of spectral class M2 and luminosity class II. Based on this information which of the following are true? I. Scheat has a surface temperature less than the sun. II. Scheat has a diameter that is greater than that of the sun. III. Scheat is more luminous than the sun. IV. S ...
... Scheat ( Pegasi) is a star of spectral class M2 and luminosity class II. Based on this information which of the following are true? I. Scheat has a surface temperature less than the sun. II. Scheat has a diameter that is greater than that of the sun. III. Scheat is more luminous than the sun. IV. S ...
Prospecting for Planets – Radial Velocity Searches
... The first planet orbiting a star other than our Sun (or 'exoplanet') was discovered in 1992, orbiting an odd type of star known as a pulsar. It wasn't until three years later that the next exoplanet was discovered, this time around a star similar to our Sun. Since then the number of exoplanets we ha ...
... The first planet orbiting a star other than our Sun (or 'exoplanet') was discovered in 1992, orbiting an odd type of star known as a pulsar. It wasn't until three years later that the next exoplanet was discovered, this time around a star similar to our Sun. Since then the number of exoplanets we ha ...
Astronomy Library wk 6.cwk (WP)
... Transformation of Astronomy Antiquity – 1700s: Most astronomers were interested in the planets: Stars remain fixed—it was the planets which moved in interesting ways. With the telescope planets could be resolved but stars still looked like points of light. Interest in the stars started to emerge in ...
... Transformation of Astronomy Antiquity – 1700s: Most astronomers were interested in the planets: Stars remain fixed—it was the planets which moved in interesting ways. With the telescope planets could be resolved but stars still looked like points of light. Interest in the stars started to emerge in ...
Final review - Physics and Astronomy
... Denoted by lower-case letters, e.g., mV or mB • Absolute magnitude = apparent magnitude the star would have if placed at a standard distance (10 pc) from the Earth = dependent on luminosity only ...
... Denoted by lower-case letters, e.g., mV or mB • Absolute magnitude = apparent magnitude the star would have if placed at a standard distance (10 pc) from the Earth = dependent on luminosity only ...
Today`s Powerpoint
... Globular clusters formed 12-14 billion years ago. Useful info for studying the history of the Milky Way Galaxy. ...
... Globular clusters formed 12-14 billion years ago. Useful info for studying the history of the Milky Way Galaxy. ...
Universe 8e Lecture Chapter 17 Nature of Stars
... shells. These include carbon fusion, neon fusion, oxygen fusion, and silicon fusion. The Deaths of the Most Massive Stars: A star with an initial mass greater than 8 M dies in a violent cataclysm in which its core collapses and most of its matter is ejected into space at high speeds. The luminosity ...
... shells. These include carbon fusion, neon fusion, oxygen fusion, and silicon fusion. The Deaths of the Most Massive Stars: A star with an initial mass greater than 8 M dies in a violent cataclysm in which its core collapses and most of its matter is ejected into space at high speeds. The luminosity ...
answer key
... We can read the star’s luminosity directly off a graph and determine its distance by measuring the energy flux at Earth using the inverse-square law. The existence of the main sequence allows us to make a connection between an easily measured quantity (temperature) and the star’s luminosity, which w ...
... We can read the star’s luminosity directly off a graph and determine its distance by measuring the energy flux at Earth using the inverse-square law. The existence of the main sequence allows us to make a connection between an easily measured quantity (temperature) and the star’s luminosity, which w ...
What is a star? A star is a giant ball of gases held together by gravity
... Stars come in a variety of sizes and colors. A few stars are dwarf stars that are smaller than Earth. Other stars are supergiants that are hundreds of times larger than our sun. Our sun is a medium-sized star with a diameter of about 1,400,000 km. or 865,000 miles. It would take over one hundred Ear ...
... Stars come in a variety of sizes and colors. A few stars are dwarf stars that are smaller than Earth. Other stars are supergiants that are hundreds of times larger than our sun. Our sun is a medium-sized star with a diameter of about 1,400,000 km. or 865,000 miles. It would take over one hundred Ear ...
test - Scioly.org
... 13. What are accretion disks also known as? 14. Name 5 ways to determine distance in space: Part IV: Math (3 pts each) You must show work in order to receive credit. Please use units, circle your answers, and round answers to 3 sig. figs. 1. Consider an object of .2 solar masses orbiting the Sun. Th ...
... 13. What are accretion disks also known as? 14. Name 5 ways to determine distance in space: Part IV: Math (3 pts each) You must show work in order to receive credit. Please use units, circle your answers, and round answers to 3 sig. figs. 1. Consider an object of .2 solar masses orbiting the Sun. Th ...
Integrative Studies 410 Our Place in the Universe
... • Different clusters have different age • Observe stellar evolution by looking at stars of same age but different mass ...
... • Different clusters have different age • Observe stellar evolution by looking at stars of same age but different mass ...
Astronomy
... The star is now in the “prime of its life”; it is in equilibrium. Over time; temp, luminosity, color change. Our sun is in the main sequence phase It will live for about 10 billion years Our sun is now about 4.6 billion years old – Links: ...
... The star is now in the “prime of its life”; it is in equilibrium. Over time; temp, luminosity, color change. Our sun is in the main sequence phase It will live for about 10 billion years Our sun is now about 4.6 billion years old – Links: ...
Today`s Powerpoint
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
PHY216_lect1_2014 - Astrophysics Research Institute
... set in the west. The hour angle tells you how long it will be before the star transits (or how much time has passed since it transited!) • Hour Angle - angle between a star's current position and the meridian (measured WESTWARD in hours, where 1 hour is equivalent to 15 degrees – because 24 hours = ...
... set in the west. The hour angle tells you how long it will be before the star transits (or how much time has passed since it transited!) • Hour Angle - angle between a star's current position and the meridian (measured WESTWARD in hours, where 1 hour is equivalent to 15 degrees – because 24 hours = ...
Photoelectric Photometry of the Pleiades Student Manual
... magnitude number. Bright stars have a small apparent magnitude number; in fact, very bright stars actually have negative apparent magnitudes. Plot your y axis in such a way that zero magnitude is at the top, and 25th magnitude (a very dim star indeed) is at the bottom. The x axis should range from - ...
... magnitude number. Bright stars have a small apparent magnitude number; in fact, very bright stars actually have negative apparent magnitudes. Plot your y axis in such a way that zero magnitude is at the top, and 25th magnitude (a very dim star indeed) is at the bottom. The x axis should range from - ...
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.