STELLAR STRUCTURE AND EVOLUTION
... • relation between astronomical observables (flux, spectrum, parallax, radial velocities) and physical properties (luminosity, temperature, radius, mass, composition) • the stellar magnitude system (apparent and absolute magnitudes, bolometric magnitude, bolometric correction, distance modulus), the ...
... • relation between astronomical observables (flux, spectrum, parallax, radial velocities) and physical properties (luminosity, temperature, radius, mass, composition) • the stellar magnitude system (apparent and absolute magnitudes, bolometric magnitude, bolometric correction, distance modulus), the ...
colour
... Exercise 1.1: The V magnitudes of two main-sequence stars are both observed to be 7.5, but their blue magnitudes are B1 = 7.2 and B2 = 8.65. (a) What are the colour indices of the two stars. (b) Which star is the bluer and by what factor is it brighter at blue wavelength. (c) Making reasonable assum ...
... Exercise 1.1: The V magnitudes of two main-sequence stars are both observed to be 7.5, but their blue magnitudes are B1 = 7.2 and B2 = 8.65. (a) What are the colour indices of the two stars. (b) Which star is the bluer and by what factor is it brighter at blue wavelength. (c) Making reasonable assum ...
Document
... “The presence of interstellar gas can be seen when you look at the spectral lines of a binary star system. Among the broad lines that shift as the two stars orbit each other, you see narrow lines that do not move. The narrow lines are from much colder gas in the interstellar medium between us and t ...
... “The presence of interstellar gas can be seen when you look at the spectral lines of a binary star system. Among the broad lines that shift as the two stars orbit each other, you see narrow lines that do not move. The narrow lines are from much colder gas in the interstellar medium between us and t ...
E1 Introduction to the universe
... the matter could be found in Massive Astronomical Compact Halo Objects or MACHOs for short. There is some evidence that lots of ordinary matter does exist in these groupings. These can be thought of as low-mass failed stars or high-mass planets. They could even be black holes. These would produce li ...
... the matter could be found in Massive Astronomical Compact Halo Objects or MACHOs for short. There is some evidence that lots of ordinary matter does exist in these groupings. These can be thought of as low-mass failed stars or high-mass planets. They could even be black holes. These would produce li ...
Lecture 17, PPT version
... For the sun’s orbital radius (28,000 light years) and orbital speed (220 km/s), we find a mass of 1.0x1041 kg, or about 100 billion Msun. This mass is much too large to be explained by the sum total of stars, gas and dust in the Milky Way - it is evidence for “dark matter” in our galaxy. ...
... For the sun’s orbital radius (28,000 light years) and orbital speed (220 km/s), we find a mass of 1.0x1041 kg, or about 100 billion Msun. This mass is much too large to be explained by the sum total of stars, gas and dust in the Milky Way - it is evidence for “dark matter” in our galaxy. ...
Mass determinations of PMS stars with the
... period > 50 days that are suitable for observations with AMBER • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no standard observed) ...
... period > 50 days that are suitable for observations with AMBER • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no standard observed) ...
Constituents of the Milky Way
... Population I: objects associated with recent star formation Population II: objects with no connection to recent star formation Thus, short-lived stars, open clusters, dark clouds, H II regions, etc., are all Population I. Conversely, groups of old stars, globular clusters, etc., are Population I ...
... Population I: objects associated with recent star formation Population II: objects with no connection to recent star formation Thus, short-lived stars, open clusters, dark clouds, H II regions, etc., are all Population I. Conversely, groups of old stars, globular clusters, etc., are Population I ...
A Dart Board for the Bored An eye opening offer from the editors of
... Pole. Because of this, it can be seen all night an all year round. The two brightest stars of Cassiopeia point to Alderamin, the brightest star in Cepheus. Although the Milky Way runs slightly through Cepheus, it contains no Messier objects or other interesting deep sky objects. A star cluster and f ...
... Pole. Because of this, it can be seen all night an all year round. The two brightest stars of Cassiopeia point to Alderamin, the brightest star in Cepheus. Although the Milky Way runs slightly through Cepheus, it contains no Messier objects or other interesting deep sky objects. A star cluster and f ...
Photoelectric Photometry of the Pleiades
... 8. Take a Star Reading and Record the Results 1. Click on the Change View button to activate the Finder mode. Click on Set Coordinates to enter a RA and Dec from the Data Table on Page 14. Move the telescope using the directional buttons to center a star in the red square. 2. Click on the Change Vie ...
... 8. Take a Star Reading and Record the Results 1. Click on the Change View button to activate the Finder mode. Click on Set Coordinates to enter a RA and Dec from the Data Table on Page 14. Move the telescope using the directional buttons to center a star in the red square. 2. Click on the Change Vie ...
Celestial Distances
... Thus, completely new techniques are needed for more distant stars The breakthrough in measuring the enormous distances came from the study of variable stars, or variables These are stars that vary in luminosity Thus, their brightness changes with time In contrast, most stars are constant in their lu ...
... Thus, completely new techniques are needed for more distant stars The breakthrough in measuring the enormous distances came from the study of variable stars, or variables These are stars that vary in luminosity Thus, their brightness changes with time In contrast, most stars are constant in their lu ...
ASTR2050 Spring 2005 •
... • Measuring the masses of stars • Measuring the sizes (radii) of stars ...
... • Measuring the masses of stars • Measuring the sizes (radii) of stars ...
Star Formation
... • Evidence: Mg 26 far above standard levels, within the body of meteorites. Mg 26 is the daughter product of Al 26, a radioactive element created in supernova explosions. • Indicates: A supernova went off nearby, seeding the solar system with Al 26 while the material which makes meteorites was still ...
... • Evidence: Mg 26 far above standard levels, within the body of meteorites. Mg 26 is the daughter product of Al 26, a radioactive element created in supernova explosions. • Indicates: A supernova went off nearby, seeding the solar system with Al 26 while the material which makes meteorites was still ...
Brock physics - Brock University
... (b) a little greater than the average density of the Sun. (c) a little greater than the average density of the Earth. (d) * much, much greater than the average density of the Earth. 22. The main factor preventing the further collapse of a white dwarf is (a) extremely high core temperature. (b) extre ...
... (b) a little greater than the average density of the Sun. (c) a little greater than the average density of the Earth. (d) * much, much greater than the average density of the Earth. 22. The main factor preventing the further collapse of a white dwarf is (a) extremely high core temperature. (b) extre ...
The Night Sky This Month - Usk Astronomical Society
... However, at a magnitude of 7.90, is far too dim to see with the naked eye and not much better with a ‘scope. Even by the end of this month Neptune is pretty unfavourable. Meteors The Eta Aquarids, A meteor shower associated with comet 1P/Halley, manifests itself best in the first eight days of May, ...
... However, at a magnitude of 7.90, is far too dim to see with the naked eye and not much better with a ‘scope. Even by the end of this month Neptune is pretty unfavourable. Meteors The Eta Aquarids, A meteor shower associated with comet 1P/Halley, manifests itself best in the first eight days of May, ...
Lecture 11, PPT version
... Many such X-ray binary systems exist in our Galaxy, with black holes that have masses between 4 Msun and 10 Msun ...
... Many such X-ray binary systems exist in our Galaxy, with black holes that have masses between 4 Msun and 10 Msun ...
Astronomy 100 Name(s):
... lab is designed to help you understand how the software works and what its capabilities are. Obtain a laptop computer from the cart (remember to leave the AC adapter in the cart), turn on the computer and, once the Windows desktop is displayed, click on “the Sky” icon along the bottom row or else th ...
... lab is designed to help you understand how the software works and what its capabilities are. Obtain a laptop computer from the cart (remember to leave the AC adapter in the cart), turn on the computer and, once the Windows desktop is displayed, click on “the Sky” icon along the bottom row or else th ...
Reflecting telescopes - School
... Magnitude is a measure of how bright a star is. There are, however, two different ways of indicating a stars magnitude; apparent magnitude and absolute magnitude. The scale we use to measure magnitude is based on that created by the ancient Greeks which ran from 1 to 6. On the ancient Greek scale 1 ...
... Magnitude is a measure of how bright a star is. There are, however, two different ways of indicating a stars magnitude; apparent magnitude and absolute magnitude. The scale we use to measure magnitude is based on that created by the ancient Greeks which ran from 1 to 6. On the ancient Greek scale 1 ...
Astronomy - Test 3
... E) Although such objects could occur, they would be so rare that we ignore them 26. Which of the following was not a method for making black holes that was discussed? A) Very high mass star supernova B) White dwarf supernova C) Accretion of matter onto a neutron star D) Merger of neutron stars E) Ac ...
... E) Although such objects could occur, they would be so rare that we ignore them 26. Which of the following was not a method for making black holes that was discussed? A) Very high mass star supernova B) White dwarf supernova C) Accretion of matter onto a neutron star D) Merger of neutron stars E) Ac ...
Life Cycle of a Star - Intervention Worksheet
... All stars start as a nebula. A nebula is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life. A star is born when the gas and dust from a nebula become so h ...
... All stars start as a nebula. A nebula is a large cloud of gas and dust. Gravity can pull some of the gas and dust in a nebula together. The contracting cloud is then called a protostar. A protostar is the earliest stage of a star’s life. A star is born when the gas and dust from a nebula become so h ...
C H A P T E R 2
... and sun. For now turn off all reference lines, including the constellation reference lines. Now you’re ready to begin the demonstration. Press Alt+> and the program will display the daily motion of the sky in 5minute increments. At the 5-minute time step, a full 24 hours passes in about 35 seconds. ...
... and sun. For now turn off all reference lines, including the constellation reference lines. Now you’re ready to begin the demonstration. Press Alt+> and the program will display the daily motion of the sky in 5minute increments. At the 5-minute time step, a full 24 hours passes in about 35 seconds. ...
FREE Sample Here
... and sun. For now turn off all reference lines, including the constellation reference lines. Now you’re ready to begin the demonstration. Press Alt+> and the program will display the daily motion of the sky in 5minute increments. At the 5-minute time step, a full 24 hours passes in about 35 seconds. ...
... and sun. For now turn off all reference lines, including the constellation reference lines. Now you’re ready to begin the demonstration. Press Alt+> and the program will display the daily motion of the sky in 5minute increments. At the 5-minute time step, a full 24 hours passes in about 35 seconds. ...
Corona Australis
Corona Australis /kɵˈroʊnə ɒˈstreɪlɨs/ or Corona Austrina /kɵˈroʊnə ɒˈstraɪnə/ is a constellation in the Southern Celestial Hemisphere. Its Latin name means ""southern crown"", and it is the southern counterpart of Corona Borealis, the northern crown. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The Ancient Greeks saw Corona Australis as a wreath rather than a crown and associated it with Sagittarius or Centaurus. Other cultures have likened the pattern to a turtle, ostrich nest, a tent, or even a hut belonging to a rock hyrax.Although fainter than its namesake, the oval- or horseshoe-shaped pattern of its brighter stars renders it distinctive. Alpha and Beta Coronae Australis are the two brightest stars with an apparent magnitude of around 4.1. Epsilon Coronae Australis is the brightest example of a W Ursae Majoris variable in the southern sky. Lying alongside the Milky Way, Corona Australis contains one of the closest star-forming regions to our Solar System—a dusty dark nebula known as the Corona Australis Molecular Cloud, lying about 430 light years away. Within it are stars at the earliest stages of their lifespan. The variable stars R and TY Coronae Australis light up parts of the nebula, which varies in brightness accordingly.