Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
Document
... falls into another neutron star or black hole. The resulting explosion sends out particles and radiation all over the spectrum They are the most luminous things in the universe In May a GRB was seen at redshift 8. It is the farthest thing ever seen and occurred only 400 million years after the big b ...
... falls into another neutron star or black hole. The resulting explosion sends out particles and radiation all over the spectrum They are the most luminous things in the universe In May a GRB was seen at redshift 8. It is the farthest thing ever seen and occurred only 400 million years after the big b ...
Measuring The Parallax of Barnard's Star
... the measured proper motion is 10.553 arcseconds per year. This value matches quite well with the established rate of proper motion of 10.37 arcseconds per year. And, the velocity in arcseconds per year times the distance in parsecs gives the velocity in astronomical units (au) per year. Using our de ...
... the measured proper motion is 10.553 arcseconds per year. This value matches quite well with the established rate of proper motion of 10.37 arcseconds per year. And, the velocity in arcseconds per year times the distance in parsecs gives the velocity in astronomical units (au) per year. Using our de ...
Lecture 13: The Stars –
... Together Saha and PayneGaposchkin • Gave theoretical explanation for Cannon’s classification scheme. • Showed that the differences in spectra (absorption lines) are due to temperature and thermal ionization of atoms not abundance of elements • Provided a convincing argument that stars are mostly ma ...
... Together Saha and PayneGaposchkin • Gave theoretical explanation for Cannon’s classification scheme. • Showed that the differences in spectra (absorption lines) are due to temperature and thermal ionization of atoms not abundance of elements • Provided a convincing argument that stars are mostly ma ...
Foundations III The Stars
... Together Saha and PayneGaposchkin • Gave theoretical explanation for Cannon’s classification scheme. • Showed that the differences in spectra (absorption lines) are due to temperature and thermal ionization of atoms not abundance of elements ...
... Together Saha and PayneGaposchkin • Gave theoretical explanation for Cannon’s classification scheme. • Showed that the differences in spectra (absorption lines) are due to temperature and thermal ionization of atoms not abundance of elements ...
Stars and Galaxies
... become white dwarfs • Carbon atoms continue to fuse creating heavier elements like oxygen & nitrogen • Core of massive star so hot that fusion continues until the heavy element of iron is ...
... become white dwarfs • Carbon atoms continue to fuse creating heavier elements like oxygen & nitrogen • Core of massive star so hot that fusion continues until the heavy element of iron is ...
Night Sky Checklist October–November
... Delta Cephei is another variable star, this time one that actually varies its brightness over a period of about 5.4 days. Although it is fairly faint even at its best at magnitude 3.6, there are some similar brightness stars near it that help observers notice when its brightness drops off. Algol is ...
... Delta Cephei is another variable star, this time one that actually varies its brightness over a period of about 5.4 days. Although it is fairly faint even at its best at magnitude 3.6, there are some similar brightness stars near it that help observers notice when its brightness drops off. Algol is ...
Slide 1
... So why was Hipparcos a triumph? Hipparcos catalog--118,218 stars with 1 mas astrometry. Tycho catalog--106 stars with 20-30 mas astrometry and 2-color photometry. Tycho-2 catalog– 2.5 million stars. 99% of all stars to V=11. Distances determined to better than 10%- - 21k stars Distances to better t ...
... So why was Hipparcos a triumph? Hipparcos catalog--118,218 stars with 1 mas astrometry. Tycho catalog--106 stars with 20-30 mas astrometry and 2-color photometry. Tycho-2 catalog– 2.5 million stars. 99% of all stars to V=11. Distances determined to better than 10%- - 21k stars Distances to better t ...
ASTRO 1050 Distant Galaxies and the Expanding Universe
... Galaxies form giant groups called “superclusters.” The supercluster closest to our own galaxy can be seen (with a telescope) in the direction of the constellation Virgo. We call this supercluster the Local Supercluster or the Virgo cluster; it is approximately 50 million light years (15 million pars ...
... Galaxies form giant groups called “superclusters.” The supercluster closest to our own galaxy can be seen (with a telescope) in the direction of the constellation Virgo. We call this supercluster the Local Supercluster or the Virgo cluster; it is approximately 50 million light years (15 million pars ...
A not so massive cluster hosting a very massive star
... from Borissova et al. (2011), based on images from the ESO Public Survey VVV (Minniti et al. 2010). Using VVV JHKS photometry and H-, K-band spectroscopy we determine the cluster distance (via spectroscopic parallax; d = 4.2 ± 0.9 kpc), radius (r = 0.750 ), age (fitting Geneve-MS and PMS isochrones, ...
... from Borissova et al. (2011), based on images from the ESO Public Survey VVV (Minniti et al. 2010). Using VVV JHKS photometry and H-, K-band spectroscopy we determine the cluster distance (via spectroscopic parallax; d = 4.2 ± 0.9 kpc), radius (r = 0.750 ), age (fitting Geneve-MS and PMS isochrones, ...
doc - IAC
... dust visible only in silhouette against a background of more distant stars. But in 1785, Messier’s contemporary, the astronomer and musician William Herschel, of German origin, published an article in which he classified a type of nebula that appeared observationally to be distinct from the others. ...
... dust visible only in silhouette against a background of more distant stars. But in 1785, Messier’s contemporary, the astronomer and musician William Herschel, of German origin, published an article in which he classified a type of nebula that appeared observationally to be distinct from the others. ...
Stars and Constellations
... combined light appears as a faded band if the sky is very dark. 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 difficult for ...
... combined light appears as a faded band if the sky is very dark. 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 difficult for ...
Descriptions For Posters
... from Earth in the constellation of Ursa Major. With an apparent magnitude of +6.9 it's easily visible with binoculars, a fine target for small telescope owners and a wonderful sight in larger scopes. The galaxy is a striking example of a grand design spiral; a galaxy that exhibits prominent near per ...
... from Earth in the constellation of Ursa Major. With an apparent magnitude of +6.9 it's easily visible with binoculars, a fine target for small telescope owners and a wonderful sight in larger scopes. The galaxy is a striking example of a grand design spiral; a galaxy that exhibits prominent near per ...
Variable Star Observation
... • There are two different types of variable stars and four main classes. • Types of variable stars: ...
... • There are two different types of variable stars and four main classes. • Types of variable stars: ...
The Contents of the Milky Way
... • azimuth is angle measured E along horizon from north point (0-360o) ...
... • azimuth is angle measured E along horizon from north point (0-360o) ...
EXERCISES: Set 4 of 4 Q1: (You will need a ruler and a calculator
... Note: Q8 is at an advanced level. However, try your best: even partial attempts will be useful ahead of the supervision. Q8(a): Give the definition and the physical interpretation of the power spectrum P (k) and of the correlation function ξ(r) of the density fluctuation field δ. Q8(b): Write an ex ...
... Note: Q8 is at an advanced level. However, try your best: even partial attempts will be useful ahead of the supervision. Q8(a): Give the definition and the physical interpretation of the power spectrum P (k) and of the correlation function ξ(r) of the density fluctuation field δ. Q8(b): Write an ex ...
Astronomy 1020 Exam 4 Review Questions
... compared to the light distribution, what else can you say about the halo? How long does it take the Sun to complete one orbit about the center of the Galaxy? As such, what is the length of its galactic year? How old is the Sun in galactic years? 26. What is meant by dark matter? 27. Describe the com ...
... compared to the light distribution, what else can you say about the halo? How long does it take the Sun to complete one orbit about the center of the Galaxy? As such, what is the length of its galactic year? How old is the Sun in galactic years? 26. What is meant by dark matter? 27. Describe the com ...
Goal: To understand clusters of stars
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
... • Open clusters are YOUNG clusters that drift apart in about a billion years. • As viewed from Earth you tend to see the blue high mass stars. • Those are always young stars as they don’t last long. • These are clusters with stars of equal age, distance, and composition, but range in mass. ...
Chapter three: The properties of Stars
... within 8yrs) and measurement issues such as the black drop effect. Transits of Mercury are more frequent, but it’s parallax angle (<30”) is too small to obtain reliable results. - Near Earth Asteroids: Direct measurements of the parallax of these objects are possible when they are close to Earth. E ...
... within 8yrs) and measurement issues such as the black drop effect. Transits of Mercury are more frequent, but it’s parallax angle (<30”) is too small to obtain reliable results. - Near Earth Asteroids: Direct measurements of the parallax of these objects are possible when they are close to Earth. E ...
GEARS Workshop Monday - Georgia Southern University
... • Luminosity, Mass, temperature, radius, and age… on one graph! • Models of blackbodies allow us to know more about stars than we can get from observations alone. ...
... • Luminosity, Mass, temperature, radius, and age… on one graph! • Models of blackbodies allow us to know more about stars than we can get from observations alone. ...
April 15th
... star that have lost their outer atmospheres of hydrogen in a stellar wind • Lightcurve matches theoretical predictions of ...
... star that have lost their outer atmospheres of hydrogen in a stellar wind • Lightcurve matches theoretical predictions of ...
Name
... physical quantity. People don’t typically refer to being alive for 662,691,456 seconds as a birthday milestone, but that is what happens when someone turns 21 years old. In other words, it is quite impractical to express one’s age in terms of the base unit of time (seconds). A much larger unit, the ...
... physical quantity. People don’t typically refer to being alive for 662,691,456 seconds as a birthday milestone, but that is what happens when someone turns 21 years old. In other words, it is quite impractical to express one’s age in terms of the base unit of time (seconds). A much larger unit, the ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.