Introduction to Astronomy (high school)
... assigning Greek letters. An example of this is Dubhe as Alpha Ursae Majoris, with each star along the Big Dipper from the cup to handle having the next Greek letter. Faint stars are designated in different ways in catalogs prepared and used by astronomers. One is the Bonner Durchmusterung, compiled ...
... assigning Greek letters. An example of this is Dubhe as Alpha Ursae Majoris, with each star along the Big Dipper from the cup to handle having the next Greek letter. Faint stars are designated in different ways in catalogs prepared and used by astronomers. One is the Bonner Durchmusterung, compiled ...
The Milky Way
... measurement of the distances to the globular clusters? a. The Sun is far from the center of the Milky Way. b. The Sun is near the center of the Milky Way. c. A period-luminosity relationship also exists for RR Lyrae variable stars. d. Globular clusters have 50,000 to 1,000,000 stars. e. Open cluster ...
... measurement of the distances to the globular clusters? a. The Sun is far from the center of the Milky Way. b. The Sun is near the center of the Milky Way. c. A period-luminosity relationship also exists for RR Lyrae variable stars. d. Globular clusters have 50,000 to 1,000,000 stars. e. Open cluster ...
Uranometria 2000.0`s Dark Nebulae Database
... observer and a bright nebula or a very dense star field, against which they can be seen silhouetted. Observationally, dark nebulae are among the most difficult deep-sky objects. The Coalsack, near the Southern Cross (Charts 198 and 209), is an example clearly visible to the unaided eye because it ha ...
... observer and a bright nebula or a very dense star field, against which they can be seen silhouetted. Observationally, dark nebulae are among the most difficult deep-sky objects. The Coalsack, near the Southern Cross (Charts 198 and 209), is an example clearly visible to the unaided eye because it ha ...
Exercises - Leiden Observatory
... iv. In stellar evolution models one often assumes that stars evolve quasi-statically, i.e. that the star remains in hydrostatic equilibrium throughout. Why can we make this assumption? v. Rapid changes that are sometimes observed in stars may indicate that dynamical processes are taking place. From ...
... iv. In stellar evolution models one often assumes that stars evolve quasi-statically, i.e. that the star remains in hydrostatic equilibrium throughout. Why can we make this assumption? v. Rapid changes that are sometimes observed in stars may indicate that dynamical processes are taking place. From ...
Galactic Evolution:
... Milky Way, thus, planetary systems forming in other locations and times in the Milky Way with the same metallicity as the Sun will not necessarily form habitable Earth like planets. As a result of the radial Galactic metafficity gradient, the outer limit of the GHZ is set primarily by the minimum re ...
... Milky Way, thus, planetary systems forming in other locations and times in the Milky Way with the same metallicity as the Sun will not necessarily form habitable Earth like planets. As a result of the radial Galactic metafficity gradient, the outer limit of the GHZ is set primarily by the minimum re ...
Lecture 7
... on matter in the Universe, much as stars form from clumps of gas within galaxies. We will see computer simulations of this later. 5) The density of neighbors around a galaxy is called its environment. These range from very sparse (as in the Local Group) to very dense in big clusters. Hubble types va ...
... on matter in the Universe, much as stars form from clumps of gas within galaxies. We will see computer simulations of this later. 5) The density of neighbors around a galaxy is called its environment. These range from very sparse (as in the Local Group) to very dense in big clusters. Hubble types va ...
Testing
... • When and why do we have leap years? – Because a tropical year is 365.25 days, we need to add an extra day every four years so that the seasons remain synchronized with the calendar. ...
... • When and why do we have leap years? – Because a tropical year is 365.25 days, we need to add an extra day every four years so that the seasons remain synchronized with the calendar. ...
THE PROPERTIES OF MAIN-SEQUENCE STARS - Cosmos
... in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type ...
... in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in MV of mainsequence stars of given spectral type ...
Moitinho et al. - Wiley Online Library
... We have recently found (Carraro et al. 2005) that the BP is actually composed of a young population less than 100 Myr old. Except for the cluster sequence which is well detached from the rest of the stars, the CMD of the field around the open cluster NGC 2362 shown in Fig. 1 is identical to the one ...
... We have recently found (Carraro et al. 2005) that the BP is actually composed of a young population less than 100 Myr old. Except for the cluster sequence which is well detached from the rest of the stars, the CMD of the field around the open cluster NGC 2362 shown in Fig. 1 is identical to the one ...
Physics - Content by Unit
... within the galaxy. Rubin and Ford expected to find that the hydrogen gas outside the visible edge of the galaxy would be moving slower than gas at the edge of the galaxy. This is what the virial theorem predicts if the mass in the galaxy is concentrated where the galaxy emits light. Instead, they fo ...
... within the galaxy. Rubin and Ford expected to find that the hydrogen gas outside the visible edge of the galaxy would be moving slower than gas at the edge of the galaxy. This is what the virial theorem predicts if the mass in the galaxy is concentrated where the galaxy emits light. Instead, they fo ...
Working with the Illinois Learning Standards: A Constructivist
... Stars evolve much as animals evolve. The source of energy of the stars is unknown. As stars shrink due to gravity, they change from red to blue. Red stars are hot; blue stars are cool. Stars are all roughly the same size. Stars change little over their life spans. Stars can only last thousands or mi ...
... Stars evolve much as animals evolve. The source of energy of the stars is unknown. As stars shrink due to gravity, they change from red to blue. Red stars are hot; blue stars are cool. Stars are all roughly the same size. Stars change little over their life spans. Stars can only last thousands or mi ...
Spectra PowerPoint
... • The strength of the hydrogen Balmer lines depends on the temperature of the star’s surface layers. – Both hot and cool stars have weak Balmer lines. – Medium-temperature stars have strong Balmer lines. ...
... • The strength of the hydrogen Balmer lines depends on the temperature of the star’s surface layers. – Both hot and cool stars have weak Balmer lines. – Medium-temperature stars have strong Balmer lines. ...
The Life And Times Of A Star
... The Mass-Luminosity relation can be used to figure out how long before a star begins to run out of hydrogen fuel. – A star’s mass determines how much hydrogen fuel it has to burn (more matter = more fuel) – A star’s luminosity determines how fast the hydrogen fuel is burned (more luminous = ...
... The Mass-Luminosity relation can be used to figure out how long before a star begins to run out of hydrogen fuel. – A star’s mass determines how much hydrogen fuel it has to burn (more matter = more fuel) – A star’s luminosity determines how fast the hydrogen fuel is burned (more luminous = ...
File
... The shape of the Milky Way Galaxy is a huge disk whose diameter is100,000 light years. In the model, we reduced the 100,000 light years into 30cm (12in). The distance between the Sun and the Earth (1 AU (Astronomical Unit) = 150,000,000 km (94,000,000 miles)) is 0.000000005 cm (0.000000002 in), so b ...
... The shape of the Milky Way Galaxy is a huge disk whose diameter is100,000 light years. In the model, we reduced the 100,000 light years into 30cm (12in). The distance between the Sun and the Earth (1 AU (Astronomical Unit) = 150,000,000 km (94,000,000 miles)) is 0.000000005 cm (0.000000002 in), so b ...
Deep Space Mystery Note Form 3
... In these systems supernovas occur also. Stars up to eight times the mass of our sun usually evolve into white dwarfs. A star that is condensed to this size has a very strong gravitational pull. With that gravity, if the second star is close enough, it can pull material from there. White dw ...
... In these systems supernovas occur also. Stars up to eight times the mass of our sun usually evolve into white dwarfs. A star that is condensed to this size has a very strong gravitational pull. With that gravity, if the second star is close enough, it can pull material from there. White dw ...
preliminary version - University of Exeter
... (Cep OB3b). A neat evolutionary sequence is spoiled by IC 348, however. Like the ONC, the high mass stars in IC 348 are rotating slowly, with a peak around 8 days. In fact, the stars in IC 348 are rotating more slowly than the stars in the ONC, with a significant absence of rotators below 2 days. Th ...
... (Cep OB3b). A neat evolutionary sequence is spoiled by IC 348, however. Like the ONC, the high mass stars in IC 348 are rotating slowly, with a peak around 8 days. In fact, the stars in IC 348 are rotating more slowly than the stars in the ONC, with a significant absence of rotators below 2 days. Th ...
PDF format
... What is a Hertzsprung-Russell diagram? What is the significance of the main sequence? What are giants, supergiants, and white dwarfs? Why do the properties of some stars vary? ...
... What is a Hertzsprung-Russell diagram? What is the significance of the main sequence? What are giants, supergiants, and white dwarfs? Why do the properties of some stars vary? ...
LIFEPAC® 7th Grade Science Unit 3 Worktext - HomeSchool
... cloud of stars stretching across the sky. You can see a great number of stars. With a telescope you can see many more stars. People in ancient times thought that all stars were part of the Milky Way. Today we know of many other galaxies similar to the Milky Way. To study the Milky Way as a whole is ...
... cloud of stars stretching across the sky. You can see a great number of stars. With a telescope you can see many more stars. People in ancient times thought that all stars were part of the Milky Way. Today we know of many other galaxies similar to the Milky Way. To study the Milky Way as a whole is ...
Chapter 13: Interstellar Matter and Star Formation
... century. Russell thought that stars are born as red giants, become O- and B-type main sequence stars and then move down the main sequence, gradually dimming as they live out their lives. 2. We now know that stars live most of their on the main sequence with very little change in position and the red ...
... century. Russell thought that stars are born as red giants, become O- and B-type main sequence stars and then move down the main sequence, gradually dimming as they live out their lives. 2. We now know that stars live most of their on the main sequence with very little change in position and the red ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.