Apr 2017 - Bays Mountain Park
... celestial event. Of course, I am talking about the Total Solar Eclipse coming up on August 21st. Whether you are accompanying Bays Mountain on their excursion or taking a trip of your own, most of us plan on spending that day staring at our very own star. Of course, we are all going to do it the saf ...
... celestial event. Of course, I am talking about the Total Solar Eclipse coming up on August 21st. Whether you are accompanying Bays Mountain on their excursion or taking a trip of your own, most of us plan on spending that day staring at our very own star. Of course, we are all going to do it the saf ...
Teacher Demo: Bright Star or Close Star?
... The effects of temperature and brightness may be discussed. Betelgeuse is 15 times bigger (in radius) than Rigel and it is closer by more than 100 ly. Why is Rigel brighter? The explanation is that Betelgeuse is a red supergiant star that has evolved off the main sequence. This means that it has bur ...
... The effects of temperature and brightness may be discussed. Betelgeuse is 15 times bigger (in radius) than Rigel and it is closer by more than 100 ly. Why is Rigel brighter? The explanation is that Betelgeuse is a red supergiant star that has evolved off the main sequence. This means that it has bur ...
Gravitational redshifts
... synthetic line profiles) are shorter than laboratory values due to convective blueshift. Curves before and after mid-transit (µ = 0.21, 0.59, 0.87) are not exact mirror images due to intrinsic stellar line asymmetries. This simulation from a CO5BOLD model predicts the behavior of an Fe I line ( 620 ...
... synthetic line profiles) are shorter than laboratory values due to convective blueshift. Curves before and after mid-transit (µ = 0.21, 0.59, 0.87) are not exact mirror images due to intrinsic stellar line asymmetries. This simulation from a CO5BOLD model predicts the behavior of an Fe I line ( 620 ...
8.1 Stars
... slowly than more massive stars do. Low mass stars burn so slowly that they can last for 100 billion year. This is due to less gravity and thus less pressure. The light from a red dwarf starts dim and ...
... slowly than more massive stars do. Low mass stars burn so slowly that they can last for 100 billion year. This is due to less gravity and thus less pressure. The light from a red dwarf starts dim and ...
Solar systems like ours may be rare - Space.com
... some other stars already formed planets. It's only a snapshot in time and as you look at other clusters at different ages you can build up a better picture." Other scientists agree there are many unanswered questions about solar systems beyond our own. "As the precision with which we can measure imp ...
... some other stars already formed planets. It's only a snapshot in time and as you look at other clusters at different ages you can build up a better picture." Other scientists agree there are many unanswered questions about solar systems beyond our own. "As the precision with which we can measure imp ...
Galaxy Zoo: Pre and post‐workshop information
... In 1923 Edwin Hubble looked at galaxies (which he thought were nebulae or clouds of bright gas) through a 100” reflector (telescope with a mirror) on Mt Wilson in the US. He took a photo of Andromeda (which can be seen on a clear night with the naked eye). Hubble grouped these galaxies according to ...
... In 1923 Edwin Hubble looked at galaxies (which he thought were nebulae or clouds of bright gas) through a 100” reflector (telescope with a mirror) on Mt Wilson in the US. He took a photo of Andromeda (which can be seen on a clear night with the naked eye). Hubble grouped these galaxies according to ...
Space Exploration andAstronomy in the Physics classroom
... as the Tidbinbilla Deep Space Tracking Station, with its 70m diameter antenna (like a satellite dish only much more massive and used to communicate with deep space probes rather than with satellites). http://www.cdscc.nasa.gov/Pages2/pg01j_history.html http://en.wikipedia.org/wiki/Canberra_Deep_Spac ...
... as the Tidbinbilla Deep Space Tracking Station, with its 70m diameter antenna (like a satellite dish only much more massive and used to communicate with deep space probes rather than with satellites). http://www.cdscc.nasa.gov/Pages2/pg01j_history.html http://en.wikipedia.org/wiki/Canberra_Deep_Spac ...
Open clusters
... We see eclipsing binaries by looking at stars in the sky and seeing if they change brightness. This would mean the stars are going in front and behind each other, blocking out some of the light. We call what we see a “light curve”. ...
... We see eclipsing binaries by looking at stars in the sky and seeing if they change brightness. This would mean the stars are going in front and behind each other, blocking out some of the light. We call what we see a “light curve”. ...
Powerpoint for today
... Millisecond pulsars: periods of 1 to a few msec. Probably accreted matter from a binary companion that made it spin faster. Gamma-ray Bursts: some pulsars produce bursts of gamma-rays, ...
... Millisecond pulsars: periods of 1 to a few msec. Probably accreted matter from a binary companion that made it spin faster. Gamma-ray Bursts: some pulsars produce bursts of gamma-rays, ...
From Inner Earth to Outer Space
... of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360x60x60/(2π) ≈ 206,265 units, such as (approximately) 1 cm at 2.1 km. 14. Interferometers were first used by Michaelson, who won the Nobel Prize in 1907 for his work using an optical interferometer to accurate ...
... of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360x60x60/(2π) ≈ 206,265 units, such as (approximately) 1 cm at 2.1 km. 14. Interferometers were first used by Michaelson, who won the Nobel Prize in 1907 for his work using an optical interferometer to accurate ...
The HR Diagram (PowerPoint version)
... The Surprising Conclusion The stars do not differ significantly in composition! They are ~ 2/3 H, ~ 1/3 He, with just a few percent of everything else (at least in the outer parts, which is what the spectrum tells us about) Incidentally, helium was first detected in the solar spectrum (hence its na ...
... The Surprising Conclusion The stars do not differ significantly in composition! They are ~ 2/3 H, ~ 1/3 He, with just a few percent of everything else (at least in the outer parts, which is what the spectrum tells us about) Incidentally, helium was first detected in the solar spectrum (hence its na ...
Instruction Manual Meade Instruments Corporation
... as magnification is increased, back down to a lower power; The atmosphere is not steady enough to support higher powers. Note: Changing eyepieces changes power. 3. If you are observing an astronomical object (the Moon, a planet, star, etc.) you will notice that the object will begin to move slowly ...
... as magnification is increased, back down to a lower power; The atmosphere is not steady enough to support higher powers. Note: Changing eyepieces changes power. 3. If you are observing an astronomical object (the Moon, a planet, star, etc.) you will notice that the object will begin to move slowly ...
Exam2 Review Slides
... Photons have a difficult time moving through a star’s atmosphere If the photon has the right energy, it will be absorbed by an atom and raise an electron to a higher energy level Creates absorption spectra, a unique “fingerprint” for the star’s composition. The strength of this spectra is determined ...
... Photons have a difficult time moving through a star’s atmosphere If the photon has the right energy, it will be absorbed by an atom and raise an electron to a higher energy level Creates absorption spectra, a unique “fingerprint” for the star’s composition. The strength of this spectra is determined ...
Mark Rubin
... (“optimistic”), low-metallicity (“plausible), and heavy Population II (“heavy Salpeter”) scenarios. We also indicate show the approximate sensitivity range of the GSMTs. The presence of strong, detectable HeII emission is a clear indication of a drastic change in the stellar initial mass function an ...
... (“optimistic”), low-metallicity (“plausible), and heavy Population II (“heavy Salpeter”) scenarios. We also indicate show the approximate sensitivity range of the GSMTs. The presence of strong, detectable HeII emission is a clear indication of a drastic change in the stellar initial mass function an ...
Conference Summary Richard Ellis (Caltech) ITALIA
... • How did the Hubble Sequence emerge at z<1 from the varied active and irregular sources at z > 2? What are the physical processes involved? Are the detailed models correct? • z > 6 the final frontier: did early galaxies reionize the Universe and what early feedback processes shape the later assembl ...
... • How did the Hubble Sequence emerge at z<1 from the varied active and irregular sources at z > 2? What are the physical processes involved? Are the detailed models correct? • z > 6 the final frontier: did early galaxies reionize the Universe and what early feedback processes shape the later assembl ...
The Moon.
... Answer: The constellations have been in the same positions for thousands of years. As Earth orbits the sun, it goes through different areas of space. This means that each season Earth is in a different part of space. For this reason, the constellations or star patterns that can be seen from Earth ch ...
... Answer: The constellations have been in the same positions for thousands of years. As Earth orbits the sun, it goes through different areas of space. This means that each season Earth is in a different part of space. For this reason, the constellations or star patterns that can be seen from Earth ch ...
Monday, October 27
... • Then do the following Gedankenexperiment: – In your mind, put the star from its actual position to a position 10 pc away – If a star is actually closer than 10pc, its absolute magnitude will be a bigger number, i.e. it is intrinsically dimmer than it appears – If a star is farther than 10pc, its a ...
... • Then do the following Gedankenexperiment: – In your mind, put the star from its actual position to a position 10 pc away – If a star is actually closer than 10pc, its absolute magnitude will be a bigger number, i.e. it is intrinsically dimmer than it appears – If a star is farther than 10pc, its a ...
Cosmic Distance Ladder Terrence Tao (UCLA)
... 1. Planets orbit in ellipses, with the Sun as one of the foci. 2. A planet sweeps out equal areas in equal times. 3. The square of the period of an orbit is proportional to the cube of its semi-major axis. ...
... 1. Planets orbit in ellipses, with the Sun as one of the foci. 2. A planet sweeps out equal areas in equal times. 3. The square of the period of an orbit is proportional to the cube of its semi-major axis. ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.