Luminosity Classes
... In general the less dense a star is the more luminous it will be (because it has more surface area). Luminosity and the thickness of the absorption lines are combined to group stars into Lumniosity Classes. Luminosity Classes are combined with spectral class to describe Stars. The Sun is Class V so ...
... In general the less dense a star is the more luminous it will be (because it has more surface area). Luminosity and the thickness of the absorption lines are combined to group stars into Lumniosity Classes. Luminosity Classes are combined with spectral class to describe Stars. The Sun is Class V so ...
Homework #7 (Ch. 19)
... can actually hinder star formation, as the rotation wants to fling material out of the cloud, opposing gravity. Thus, a rotating cloud needs a stronger gravitational pull, and thus more mass, to be able to collapse than a cloud that is spinning slowly or not at all. Rapid spin also causes the cloud ...
... can actually hinder star formation, as the rotation wants to fling material out of the cloud, opposing gravity. Thus, a rotating cloud needs a stronger gravitational pull, and thus more mass, to be able to collapse than a cloud that is spinning slowly or not at all. Rapid spin also causes the cloud ...
Grand Tour Worksheet - School District of La Crosse
... 3. 100 is what order of magnitude larger than 1? 4. 1000,000 is what order of magnitude larger than 100? 5. assuming 10 has an order of magnitude of 0, and then determine the order of magnitude of the following relative to 10 ...
... 3. 100 is what order of magnitude larger than 1? 4. 1000,000 is what order of magnitude larger than 100? 5. assuming 10 has an order of magnitude of 0, and then determine the order of magnitude of the following relative to 10 ...
1) The following questions refer to the HR diagram
... 22) What happens to the surface temperature and luminosity when a protostar radiatively contracts? A) Its surface temperature remains the same and its luminosity decreases. B) Its surface temperature and luminosity remain the same. C) Its surface temperature decreases and its luminosity increases. D ...
... 22) What happens to the surface temperature and luminosity when a protostar radiatively contracts? A) Its surface temperature remains the same and its luminosity decreases. B) Its surface temperature and luminosity remain the same. C) Its surface temperature decreases and its luminosity increases. D ...
Stellar Evolution - Academic Computer Center
... • Once neutrons are formed the collapse stops, the surrounding gas is heated and explodes off the core. This is a supernova explosion. • The explosion is so energetic that it can outshine the combined light of a galaxy! • Heavy elements are formed in the material blown off the star. These elements a ...
... • Once neutrons are formed the collapse stops, the surrounding gas is heated and explodes off the core. This is a supernova explosion. • The explosion is so energetic that it can outshine the combined light of a galaxy! • Heavy elements are formed in the material blown off the star. These elements a ...
Distance
... If stars are too far away, the parallax can be too small to measure accurately. The smallest parallax measurable from the ground is about 0.01‐arcsec • Measure distances out to ~100 pc • But, only a few hundred stars this close ...
... If stars are too far away, the parallax can be too small to measure accurately. The smallest parallax measurable from the ground is about 0.01‐arcsec • Measure distances out to ~100 pc • But, only a few hundred stars this close ...
Theoretical Problem 3
... the ratio of mass M to radius R is the same and depends only on physical constants. Find the equation for the ratio M / R for stars fusing hydrogen. ...
... the ratio of mass M to radius R is the same and depends only on physical constants. Find the equation for the ratio M / R for stars fusing hydrogen. ...
The Hertzsprung-Russell Diagram
... Equal Radius Lines In general the hotter the star is the brighter it will be. Thus you would expect stars of the same size but different temperatures to form a diagonal line called an equal radius line. Equal Radius lines can be added to an H-R diagram ...
... Equal Radius Lines In general the hotter the star is the brighter it will be. Thus you would expect stars of the same size but different temperatures to form a diagonal line called an equal radius line. Equal Radius lines can be added to an H-R diagram ...
Lecture 10: The Milky Way
... We live in a galaxy that has three major components of different ages and metallicities. Disc (thin+thick) – about 25kpc in radius, only about 1kpc thick. Most of the stars are young (0-8 Gyr), and have about the same metal content as the Sun. Total stellar mass of about 6x1010M. Bulge – a mostly o ...
... We live in a galaxy that has three major components of different ages and metallicities. Disc (thin+thick) – about 25kpc in radius, only about 1kpc thick. Most of the stars are young (0-8 Gyr), and have about the same metal content as the Sun. Total stellar mass of about 6x1010M. Bulge – a mostly o ...
Stars - HMXEarthScience
... 3. Pressure and temperature increase until the gases “ignite” and nuclear fusion begins 4. Once the star has fully ignited, it is called a “Main Sequence” star during which size, the star grows in size as it uses up its fuel 5. Eventually when the hydrogen fuel becomes exhausted, the star expands gr ...
... 3. Pressure and temperature increase until the gases “ignite” and nuclear fusion begins 4. Once the star has fully ignited, it is called a “Main Sequence” star during which size, the star grows in size as it uses up its fuel 5. Eventually when the hydrogen fuel becomes exhausted, the star expands gr ...
Stellar Evolution Before…..During……and After…. The Main
... a) The density in the corona is too low. b) The corona has too many free electrons. c) Atoms in the corona are mostly ionized. d) The corona has more heavy atoms than the core. e) Two of the above. ...
... a) The density in the corona is too low. b) The corona has too many free electrons. c) Atoms in the corona are mostly ionized. d) The corona has more heavy atoms than the core. e) Two of the above. ...
Solutions3
... a: We get the ratio of stellar masses from the ratio of velocities: m1 /m2 = v2r /v1r , so the ratio of Star A’s mass to Star B’s is 22.4/5.4 = 4.1. b: Assuming i = 90 deg and circular orbits, the maximum radial velocities give the orbital velocities of the stars, and thus the distance they traverse ...
... a: We get the ratio of stellar masses from the ratio of velocities: m1 /m2 = v2r /v1r , so the ratio of Star A’s mass to Star B’s is 22.4/5.4 = 4.1. b: Assuming i = 90 deg and circular orbits, the maximum radial velocities give the orbital velocities of the stars, and thus the distance they traverse ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.