Basic Properties of Stars
... Hertzsprung-Russell Diagram Beware of the selection effects in the HR Diagram HR diagram of the brightest stars in the night sky. HR diagram of the stars nearest to the Sun. ...
... Hertzsprung-Russell Diagram Beware of the selection effects in the HR Diagram HR diagram of the brightest stars in the night sky. HR diagram of the stars nearest to the Sun. ...
Expanding Universe and Big Bang
... a) The Doppler Effect is observed in sound and light. For sound, the apparent change in frequency as a source moves towards or away from a stationary observer should be investigated. The Doppler Effect causes similar shifts in wavelengths of light. The light from objects moving away from us is shift ...
... a) The Doppler Effect is observed in sound and light. For sound, the apparent change in frequency as a source moves towards or away from a stationary observer should be investigated. The Doppler Effect causes similar shifts in wavelengths of light. The light from objects moving away from us is shift ...
PODEX – PhOtometric Data EXtractor
... signal–to–background scatter ratio grows smaller. When this ratio falls below a certain level, including further (less exposed) pixels decreases the signal to noise ratio of the resulting light curve. The turning point, where including pixels at the edge of the PSF starts to decrease the resulting q ...
... signal–to–background scatter ratio grows smaller. When this ratio falls below a certain level, including further (less exposed) pixels decreases the signal to noise ratio of the resulting light curve. The turning point, where including pixels at the edge of the PSF starts to decrease the resulting q ...
Additional Cosmology Images
... 17.1 nm pass band, most sensitive to emission from gas at around 1 million Kelvin) reached up to a height of approximately 80,000 km. The magnetic field within the filament continues to writhe and twist for a while longer, but most of the material begins to fall down again. The filament eruption (no ...
... 17.1 nm pass band, most sensitive to emission from gas at around 1 million Kelvin) reached up to a height of approximately 80,000 km. The magnetic field within the filament continues to writhe and twist for a while longer, but most of the material begins to fall down again. The filament eruption (no ...
Hitomi Observation of the Highly Obscured High-Mass X-ray
... from SXS spectrum thanks to its outstanding energy resolution. We put a constraint on the Kα1 centroid to be 6404.8 +1.7 −1.3 eV, which is tightest among the past observations. Combining the best-fit parameters obtained with SXI and HXI, neutral or slightly ionizing state of Fe is plausible, althoug ...
... from SXS spectrum thanks to its outstanding energy resolution. We put a constraint on the Kα1 centroid to be 6404.8 +1.7 −1.3 eV, which is tightest among the past observations. Combining the best-fit parameters obtained with SXI and HXI, neutral or slightly ionizing state of Fe is plausible, althoug ...
WISE General Presentation - Georgia Southern University
... Why Study Infrared? Infrared penetrates intervening dust clouds, allowing us to see through or into them ...
... Why Study Infrared? Infrared penetrates intervening dust clouds, allowing us to see through or into them ...
Lecture 39
... helium. The relationship results from the rate of hydrogen burning: large stars have hot, dense interiors and burn hydrogen much faster than smaller stars. Consequently there is an inverse relationship between the main sequence lifetime of a star and mass. The most massive stars, up to ~100 solar ma ...
... helium. The relationship results from the rate of hydrogen burning: large stars have hot, dense interiors and burn hydrogen much faster than smaller stars. Consequently there is an inverse relationship between the main sequence lifetime of a star and mass. The most massive stars, up to ~100 solar ma ...
Chapter 2 The Copernican Revolution
... transits happen only about once per decade because Mercury’s orbit does not quite coincide with the plane of the eclip/c. Transits of Venus are even rarer, occurring only about twice per century. Th ...
... transits happen only about once per decade because Mercury’s orbit does not quite coincide with the plane of the eclip/c. Transits of Venus are even rarer, occurring only about twice per century. Th ...
TIRSPEC Users Manual Introduction TIFR Near Infrared Spectrometer and Imager
... scripts and its documentation can be downloaded from http://www.tifr.res.in/~daa/tirspec/#software This tools will guide you through flat fielding, photometry as well as spectra reduction. ...
... scripts and its documentation can be downloaded from http://www.tifr.res.in/~daa/tirspec/#software This tools will guide you through flat fielding, photometry as well as spectra reduction. ...
PACS Calibration Status and Plans
... - bright fiducial stars (6) in flux range 1 Jy – 10 Jy with well modelled photospheric emission (5–10% absolute accuracy) 2) RSRF assessment - asteroids (50) in flux range 1 Jy – 500 Jy & planets (Neptune, Uranus) 3) linearity assessment - asteroids (50) in flux range 1 Jy – 500 Jy & planets (Neptun ...
... - bright fiducial stars (6) in flux range 1 Jy – 10 Jy with well modelled photospheric emission (5–10% absolute accuracy) 2) RSRF assessment - asteroids (50) in flux range 1 Jy – 500 Jy & planets (Neptune, Uranus) 3) linearity assessment - asteroids (50) in flux range 1 Jy – 500 Jy & planets (Neptun ...
The H-R Diagram
... remaining carbon to make graphite • These graphite grains are dust, and much like “PigPen” from the “Peanuts” cartoon, they shroud themselves in their own dust, reddening the star dramatically • Since carbon is essential for life, carbon stars are very important to getting carbon out of stars and in ...
... remaining carbon to make graphite • These graphite grains are dust, and much like “PigPen” from the “Peanuts” cartoon, they shroud themselves in their own dust, reddening the star dramatically • Since carbon is essential for life, carbon stars are very important to getting carbon out of stars and in ...
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 ...
Distance, Size, and Temperature of a Star
... Because blue stars are large, and compact, they burn their fuel quickly, which gives them a very high temperature. These stars often run out of fuel in only 10,000 - 100,000 years. A blue giant is very bright. Like a lighthouse, they shine across a great distance. Even though blue giant stars are ra ...
... Because blue stars are large, and compact, they burn their fuel quickly, which gives them a very high temperature. These stars often run out of fuel in only 10,000 - 100,000 years. A blue giant is very bright. Like a lighthouse, they shine across a great distance. Even though blue giant stars are ra ...
What are yellow stars?
... Yellow stars are stars that have reached a temperature of 5,000 to 6,000 degrees Fahrenheit, and around 6,000 Kelvin. Yellow Stars have an average temperature and that makes them yellow. Blue stars are the hottest, red are the coldest. Arcturus and Antares are some of the biggest Yellow Stars that w ...
... Yellow stars are stars that have reached a temperature of 5,000 to 6,000 degrees Fahrenheit, and around 6,000 Kelvin. Yellow Stars have an average temperature and that makes them yellow. Blue stars are the hottest, red are the coldest. Arcturus and Antares are some of the biggest Yellow Stars that w ...
The birth and life of stars
... The most massive pre–main-sequence stars take the shortest time to become main-sequence stars (O and B stars). In the final stages of pre–main-sequence contraction, when hydrogen fusion is about to begin in the core, the pre–main-sequence star may undergo vigorous chromospheric activity that eje ...
... The most massive pre–main-sequence stars take the shortest time to become main-sequence stars (O and B stars). In the final stages of pre–main-sequence contraction, when hydrogen fusion is about to begin in the core, the pre–main-sequence star may undergo vigorous chromospheric activity that eje ...
Gravity-mod
... shuttle does not have to push on the astronaut (or anything else in the cabin) to keep him up. The space shuttle and the astronaut are in a constant state of freefall around the earth.’ • So with the cup, when it is in free fall the gravitational pull is pulling equally on the water and the cup, so ...
... shuttle does not have to push on the astronaut (or anything else in the cabin) to keep him up. The space shuttle and the astronaut are in a constant state of freefall around the earth.’ • So with the cup, when it is in free fall the gravitational pull is pulling equally on the water and the cup, so ...
(HR) Diagrams
... Remember that the SMALLER the MV number, the MORE LUMINOUS the star is, in absolute terms. A star with MV = –5.0 is MUCH more luminous than an MV = 1.0 star. To put it another way, a star with MV = –5.0 appears SPECTACULARLY more bright – IF SEEN FROM THE SAME DISTANCE – than a star with MV = 1.0. F ...
... Remember that the SMALLER the MV number, the MORE LUMINOUS the star is, in absolute terms. A star with MV = –5.0 is MUCH more luminous than an MV = 1.0 star. To put it another way, a star with MV = –5.0 appears SPECTACULARLY more bright – IF SEEN FROM THE SAME DISTANCE – than a star with MV = 1.0. F ...
Autostar Manual
... -6Figure 1 shows the complete Autostar menu structure showing the paths that can be followed. From any point in the menu, pressing ENTER moves along a menu line to the right. Pressing MODE moves to the left along a menu line. Pressing the down SCROLL key moves down menu lists and pressing the up SC ...
... -6Figure 1 shows the complete Autostar menu structure showing the paths that can be followed. From any point in the menu, pressing ENTER moves along a menu line to the right. Pressing MODE moves to the left along a menu line. Pressing the down SCROLL key moves down menu lists and pressing the up SC ...
8.1 Radio Emission from Solar System objects
... category of stars that show flare behavior. It is thought that these are very young stars that are ejecting matter in the form of minor jets. Most of the strong radio emission comes from stars that are either very young or very old. When stars form they go through phases of mass ejection and interac ...
... category of stars that show flare behavior. It is thought that these are very young stars that are ejecting matter in the form of minor jets. Most of the strong radio emission comes from stars that are either very young or very old. When stars form they go through phases of mass ejection and interac ...
Chapter 15 part 1
... The closest star to Earth (besides the Sun) is called Proxima Centauri. It has the largest known stellar parallax, 0.76'', which means that it is about 1/0.76 = 1.3 pc away— about 270,000 A.U., or 4.3 light-years. ...
... The closest star to Earth (besides the Sun) is called Proxima Centauri. It has the largest known stellar parallax, 0.76'', which means that it is about 1/0.76 = 1.3 pc away— about 270,000 A.U., or 4.3 light-years. ...
PSR J1833-1034
... with a guest star supernova explosion that took place in BC 48, making the system just over 2050 years old (Wang et al. 2006) ...
... with a guest star supernova explosion that took place in BC 48, making the system just over 2050 years old (Wang et al. 2006) ...
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.