ASTR 300 Stars and Stellar Systems Fall 2011
... 5. Suppose you are on Mercury, 0.39 AU from the Sun. How bright would the Sun appear compared to its brightness as seen from the Earth? The brightness is given by the flux you see. From slide 8 of Lecture 7, the flux goes as the luminosity over the distance squared. For the earth d = 1AU, while for ...
... 5. Suppose you are on Mercury, 0.39 AU from the Sun. How bright would the Sun appear compared to its brightness as seen from the Earth? The brightness is given by the flux you see. From slide 8 of Lecture 7, the flux goes as the luminosity over the distance squared. For the earth d = 1AU, while for ...
Section 2
... in the winter sky is named Orion, the Hunter, after a Greek myth. In this constellation, Orion is seen with a sword in his belt and an upraised arm. The ancient Sumerians thought that the stars in Orion formed the outline of a sheep. In ancient China, this group of stars was called “three,” probably ...
... in the winter sky is named Orion, the Hunter, after a Greek myth. In this constellation, Orion is seen with a sword in his belt and an upraised arm. The ancient Sumerians thought that the stars in Orion formed the outline of a sheep. In ancient China, this group of stars was called “three,” probably ...
Exoplanets - An ESO/OPTICON/IAU summer school on modern
... 1. Frequency of planetary systems in the Universe. 2. Formation, dynamics and evolution of planetary systems. 3. Composition and internal structure of planets. 4. Life in the Universe. ...
... 1. Frequency of planetary systems in the Universe. 2. Formation, dynamics and evolution of planetary systems. 3. Composition and internal structure of planets. 4. Life in the Universe. ...
Discovery of White Dwarfs—8 Oct
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
... Main-sequence or dwarf stars Giants Horizontal-branch stars White dwarfs are too faint for these observations. A star lives a long time as a dwarf. It is on the main sequence. When it runs out of fuel, it becomes a giant and subsequently “traces out the giant branch.” ...
4 Distances in Astronomy
... Because many distances in astronomy are very large, it is convenient to define special units that correspond to large distances. ...
... Because many distances in astronomy are very large, it is convenient to define special units that correspond to large distances. ...
Supernovae and cosmology
... Intensity differs among type Ia supernovae Change of luminosty depends on intensity Find the distance from intensity. Relatively precise measurement ...
... Intensity differs among type Ia supernovae Change of luminosty depends on intensity Find the distance from intensity. Relatively precise measurement ...
life cycles of stars
... Determining the age of a star cluster • Imagine we have a cluster of stars that were all formed at the same time, but have a variety of different masses • Using what we know about stellar evolution is there a way to determine the age of the star cluster? ...
... Determining the age of a star cluster • Imagine we have a cluster of stars that were all formed at the same time, but have a variety of different masses • Using what we know about stellar evolution is there a way to determine the age of the star cluster? ...
Hertzsprung Rusell Diagram KLT
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
Document
... The iron core mass is a (nucleosynthetic) lower limit to the baryonic mass of the neutron star. A large entropy jump characterizes the base of the oxygen shell and may provide a natural location for the mass cut. Naively the baryonic mass of the remnant may be between these two – but this is very cr ...
... The iron core mass is a (nucleosynthetic) lower limit to the baryonic mass of the neutron star. A large entropy jump characterizes the base of the oxygen shell and may provide a natural location for the mass cut. Naively the baryonic mass of the remnant may be between these two – but this is very cr ...
Lab 2
... -Cass: A Be emission line-star. Antares ( Sco). A red supergiant. P-Cygni: A mass losing supergiant. This is about mV ~ 5 and will require long exposures. Do only the part of the spectrum centered on H-alpha. Jupiter: This planet is now available. I want to see if we can (a) detect the [SII] 67 ...
... -Cass: A Be emission line-star. Antares ( Sco). A red supergiant. P-Cygni: A mass losing supergiant. This is about mV ~ 5 and will require long exposures. Do only the part of the spectrum centered on H-alpha. Jupiter: This planet is now available. I want to see if we can (a) detect the [SII] 67 ...
32Brightness
... source, where discrete colors are absorbed by atoms – From emission and absorption lines, get composition of objects and also their temperature ...
... source, where discrete colors are absorbed by atoms – From emission and absorption lines, get composition of objects and also their temperature ...
Great Migrations & other natural history tales
... Accretion disks are often found in close, interacting pairs of stars, such as the cataclysmic variables (CVs). One star, originally more massive, evolves to a compact companion: a white dwarf or perhaps a neutron star (pulsar) or a black hole. The other, originally less massive, star bloats toward ...
... Accretion disks are often found in close, interacting pairs of stars, such as the cataclysmic variables (CVs). One star, originally more massive, evolves to a compact companion: a white dwarf or perhaps a neutron star (pulsar) or a black hole. The other, originally less massive, star bloats toward ...
6 Minute English
... In terms of its current lifestyle it’s here for as long again, so we’re about half way through. And then it becomes a different sort of star – it becomes a giant star and that’s probably curtains for us, actually. It’ll get a bit warm, a bit toasty, and we’ll get enveloped in the sun, and it won’t b ...
... In terms of its current lifestyle it’s here for as long again, so we’re about half way through. And then it becomes a different sort of star – it becomes a giant star and that’s probably curtains for us, actually. It’ll get a bit warm, a bit toasty, and we’ll get enveloped in the sun, and it won’t b ...
fred`s 2017 astronomy challenge
... How to find: Never finding itself very high in the sky, and only properly visible at sunrise or sunset, Mercury is the closest planet to our Sun. However, don’t be fooled that ...
... How to find: Never finding itself very high in the sky, and only properly visible at sunrise or sunset, Mercury is the closest planet to our Sun. However, don’t be fooled that ...
Are Gamma-Ray Bursts good Star Formation Indicators?
... enshrouded systems. In such galaxies the UV flux from OB stars is largely reprocessed by the dust to far IR wavelengths. Thus submm measurements provide an independent estimate of star formation rate in the host galaxies. Combining our observations of GRB hosts with those of Berger et al. (2003 ApJ ...
... enshrouded systems. In such galaxies the UV flux from OB stars is largely reprocessed by the dust to far IR wavelengths. Thus submm measurements provide an independent estimate of star formation rate in the host galaxies. Combining our observations of GRB hosts with those of Berger et al. (2003 ApJ ...
My Constellation
... curving rows of glittering stars. Several hundred stars make up the group, which is perhaps 2500 light years away. Õ The Eskimo Nebula (NGC 2392) is one of the more distant nebulae at an estimated distance of 10,000 light years. There is a tenth-magnitude central star. If you do have a large enough ...
... curving rows of glittering stars. Several hundred stars make up the group, which is perhaps 2500 light years away. Õ The Eskimo Nebula (NGC 2392) is one of the more distant nebulae at an estimated distance of 10,000 light years. There is a tenth-magnitude central star. If you do have a large enough ...
Study of the X-ray Source Population and the Dark Matter
... The existence of X-ray binaries in these galaxies, if confirmed, would indicate that these galaxies are able to retain their compact objects, which are believed to obtain high kick velocities at their birth in asymmetric supernova explosions. Therefore, the search for and the study of X-ray sources ...
... The existence of X-ray binaries in these galaxies, if confirmed, would indicate that these galaxies are able to retain their compact objects, which are believed to obtain high kick velocities at their birth in asymmetric supernova explosions. Therefore, the search for and the study of X-ray sources ...
Life Stages of High
... of objects with <0.08MSun before the core temperature becomes hot enough for fusion. • Starlike objects not massive enough to start fusion are brown dwarfs. ...
... of objects with <0.08MSun before the core temperature becomes hot enough for fusion. • Starlike objects not massive enough to start fusion are brown dwarfs. ...
Family of stars - Inside Mines
... This is the Sun full absorption spectrum in the visible • Absorption lines for H, He, but also C, O, Ne, Fe and many more elements • The raw analysis of this spectrum lead astronomers to believe that the Sun’s surface composition was very similar to what is observed on Earth. • In 1925, Cecilia Payn ...
... This is the Sun full absorption spectrum in the visible • Absorption lines for H, He, but also C, O, Ne, Fe and many more elements • The raw analysis of this spectrum lead astronomers to believe that the Sun’s surface composition was very similar to what is observed on Earth. • In 1925, Cecilia Payn ...
lecture25
... Radar ranging - good for measuring distances in the solar system (up to about 0.0001 light years) Parallax - good for measuring distances to a few hundred light years ...
... Radar ranging - good for measuring distances in the solar system (up to about 0.0001 light years) Parallax - good for measuring distances to a few hundred light years ...
Bluffer`s Guide to Sirius
... Sun. Its surface temperature is about 9600°C (in comparison our Sun’s surface temperature is about 5500°C). Bizarrely, some historical accounts report Sirius as being red, and it is extremely hard to explain how this could have been. Any recent stellar transformation this complete and would have bee ...
... Sun. Its surface temperature is about 9600°C (in comparison our Sun’s surface temperature is about 5500°C). Bizarrely, some historical accounts report Sirius as being red, and it is extremely hard to explain how this could have been. Any recent stellar transformation this complete and would have bee ...
This lecture covers the origins of the Universe, Sun and our planet
... Think of the change in pitch as a whistling train approaches then passes you. One can quantify the red shift by looking at the relative differences in the elemental absorption lines of light emanating from a distant star vs those associated with our sun. In the case above the second absorption b ...
... Think of the change in pitch as a whistling train approaches then passes you. One can quantify the red shift by looking at the relative differences in the elemental absorption lines of light emanating from a distant star vs those associated with our sun. In the case above the second absorption b ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.