Dormant black holes turn into ravenous beasts when stars wake
... mass, estimated to be 10 million solar masses given the galaxy’s size, is in the right range to tidally disrupt a star. And archival X-ray observations showed that it had been dormant before the flare occurred. But that’s where the agreement between theory and observation ends. Observations measured ...
... mass, estimated to be 10 million solar masses given the galaxy’s size, is in the right range to tidally disrupt a star. And archival X-ray observations showed that it had been dormant before the flare occurred. But that’s where the agreement between theory and observation ends. Observations measured ...
File
... • Do now: Why is it important to know a star’s distance from Earth? What other things can we calculate if we know the distance? ...
... • Do now: Why is it important to know a star’s distance from Earth? What other things can we calculate if we know the distance? ...
The photometric system of the One
... Figure 4 illustrates the real observational time, when useful data were obtained according to the observation log in each month during the past six years. The left panel of Figure 4 gives the number of nights when observations were taken in each month and the right panel of Figure 4 gives the number ...
... Figure 4 illustrates the real observational time, when useful data were obtained according to the observation log in each month during the past six years. The left panel of Figure 4 gives the number of nights when observations were taken in each month and the right panel of Figure 4 gives the number ...
Astronomy_Stellar_Evolution_and_Type_II_Supernovae_Exam
... 13) This Nebula in the Sagittarius arm of our Milky Way Galaxy is actually just one of six bright sources which were initially thought to be separate nebulae, but were later revealed to be smaller components of a larger region of Star Formation: 14) This object is likely a black hole 14.8 times the ...
... 13) This Nebula in the Sagittarius arm of our Milky Way Galaxy is actually just one of six bright sources which were initially thought to be separate nebulae, but were later revealed to be smaller components of a larger region of Star Formation: 14) This object is likely a black hole 14.8 times the ...
star pattern identification : application to the precise attitude
... availability of only one tracking station, the orbit error inducing a shift in the reference magnetic field. The measured magnetic field was also perturbed by Field Aligned Currents, thus the attitude determination went inaccurate in the region of scientific interest. All these problems which were l ...
... availability of only one tracking station, the orbit error inducing a shift in the reference magnetic field. The measured magnetic field was also perturbed by Field Aligned Currents, thus the attitude determination went inaccurate in the region of scientific interest. All these problems which were l ...
Regulus, June-July 1990 - RASC Kingston Centre
... On the night of 02-04, I first saw the supernova in M66, Australian observer Bob Evan's 18th supernova discovery. It was fairly difficult in the 20 cm at 63X, at first, and I had to use averted vision, but later I saw it more easily. More recently, on 03-09, I found this supernova much more difficu ...
... On the night of 02-04, I first saw the supernova in M66, Australian observer Bob Evan's 18th supernova discovery. It was fairly difficult in the 20 cm at 63X, at first, and I had to use averted vision, but later I saw it more easily. More recently, on 03-09, I found this supernova much more difficu ...
Near-Earth Objects - The Koschny Family
... that the solar system is full of these objects. Many come close to our planet, and in the last 20 years over 8000 so-called near-Earth objects (NEOs) have been discovered. In the last few years, also decision makers realize that these objects pose a real threat to our planet. Unlike earthquakes or t ...
... that the solar system is full of these objects. Many come close to our planet, and in the last 20 years over 8000 so-called near-Earth objects (NEOs) have been discovered. In the last few years, also decision makers realize that these objects pose a real threat to our planet. Unlike earthquakes or t ...
IYA 2009 - AAVSO Beginner/Intermediate Amateur Astronomer
... The Start All that started to change when CCD cameras became available. It started slow. Cookbook CCD cameras were among the first for amateurs. Then came web cams, modified web cams and low cost astronomical CCD cameras such as the Meade DSI series. The advantage of these devices was that they wer ...
... The Start All that started to change when CCD cameras became available. It started slow. Cookbook CCD cameras were among the first for amateurs. Then came web cams, modified web cams and low cost astronomical CCD cameras such as the Meade DSI series. The advantage of these devices was that they wer ...
Why Spectroscopy?
... The Start All that started to change when CCD cameras became available. It started slow. Cookbook CCD cameras were among the first for amateurs. Then came web cams, modified web cams and low cost astronomical CCD cameras such as the Meade DSI series. The advantage of these devices was that they wer ...
... The Start All that started to change when CCD cameras became available. It started slow. Cookbook CCD cameras were among the first for amateurs. Then came web cams, modified web cams and low cost astronomical CCD cameras such as the Meade DSI series. The advantage of these devices was that they wer ...
Determining the Sizes & Distances of Stars Using the H
... mass loss causes the star to eject its outer layers, which continue expanding out into space to form a planetary nebulae. For example, a star like the Sun will loose approximately 60% of its mass as it evolves to become a white dwarf. White dwarfs are low in luminosity, because fusion can no longer ...
... mass loss causes the star to eject its outer layers, which continue expanding out into space to form a planetary nebulae. For example, a star like the Sun will loose approximately 60% of its mass as it evolves to become a white dwarf. White dwarfs are low in luminosity, because fusion can no longer ...
The search of habitable Earth-like exoplanets
... originally defined habitable zone definition is valid → see Earth! Class II, III and IV habitats should also populate G-type and F, K, and M-type stars Lower mass stars should have less class I habitable planets but class II, class III and class IV habitability-types may be common like on G-star ...
... originally defined habitable zone definition is valid → see Earth! Class II, III and IV habitats should also populate G-type and F, K, and M-type stars Lower mass stars should have less class I habitable planets but class II, class III and class IV habitability-types may be common like on G-star ...
Overview and Status of the Giant Magellan Telescope Project
... between the pier and the telescope structure, and it provides the bearing surfaces for the azimuth motion, discussed below. Two planar runner bearing tracks on top and a cylindrical radial runner bearing on the inside diameter define the azimuth axis. Adjustment screws between the track and pier all ...
... between the pier and the telescope structure, and it provides the bearing surfaces for the azimuth motion, discussed below. Two planar runner bearing tracks on top and a cylindrical radial runner bearing on the inside diameter define the azimuth axis. Adjustment screws between the track and pier all ...
THE CONSTELLATION OCTANS, THE OCTANT
... Nu Octantis is the brightest star in the constellation. It has an apparent visual magnitude of 3.76 and is approximately 69 light years distant from the solar system. The star is an orange giant with the stellar classification K1III. It is one of the least luminous giant stars known, with a mass 1.4 ...
... Nu Octantis is the brightest star in the constellation. It has an apparent visual magnitude of 3.76 and is approximately 69 light years distant from the solar system. The star is an orange giant with the stellar classification K1III. It is one of the least luminous giant stars known, with a mass 1.4 ...
r*=13.6 km MPA1 EOS
... scattered light contribution, which accounts for flux scattered off an equatorial accretion disk to the observer including time delays in the scattered light. We give limits to mass and radius for XTE J1807-294 and compare these to limits determined for SAX J1808-3658 and XTE J1814-334 previously de ...
... scattered light contribution, which accounts for flux scattered off an equatorial accretion disk to the observer including time delays in the scattered light. We give limits to mass and radius for XTE J1807-294 and compare these to limits determined for SAX J1808-3658 and XTE J1814-334 previously de ...
1 pracovni list HR diagram I EN
... Open the prepared CSV file in an Excel spreadsheet. To construct a H–R diagram you need to know the star’s luminosity (or absolute magnitude) and effective temperature (or spectral type or colour index). From the catalogue it is possible to obtain the absolute magnitude (calculated in column M from ...
... Open the prepared CSV file in an Excel spreadsheet. To construct a H–R diagram you need to know the star’s luminosity (or absolute magnitude) and effective temperature (or spectral type or colour index). From the catalogue it is possible to obtain the absolute magnitude (calculated in column M from ...
Chapter 12: Measuring the Properties of Stars
... 4. Modern measuring devices allow astronomers to determine magnitudes to an accuracy of 0.001 or better. 5. A few stars (e.g., Sirius) are so bright that they have negative magnitudes. Sirius’s apparent magnitude is –1.43 (it is about 10 times brighter than an average first-magnitude star). 6. Moder ...
... 4. Modern measuring devices allow astronomers to determine magnitudes to an accuracy of 0.001 or better. 5. A few stars (e.g., Sirius) are so bright that they have negative magnitudes. Sirius’s apparent magnitude is –1.43 (it is about 10 times brighter than an average first-magnitude star). 6. Moder ...
Astronomical Distance Determination • etc.
... •Eventually you end up thinking the universe is half as big as it actually is, and given its expansion rate, you also end up thinking it is younger than it is. ...
... •Eventually you end up thinking the universe is half as big as it actually is, and given its expansion rate, you also end up thinking it is younger than it is. ...
SkyWatcher - Boise Astronomical Society
... In a cosmic coincidence, three comets will soon be approaching Earth—and astronomers want you to help study them. This global campaign, which will begin at the end of January when the first comet is bright enough, will enlist amateur astronomers to help researchers continuously monitor how the comet ...
... In a cosmic coincidence, three comets will soon be approaching Earth—and astronomers want you to help study them. This global campaign, which will begin at the end of January when the first comet is bright enough, will enlist amateur astronomers to help researchers continuously monitor how the comet ...
The Be/X-ray transient V0332153: evidence for a tilt between the
... Most Be/X-ray binaries have relatively eccentric orbits, and the neutron star companion is normally far away from the disc surrounding the Be star. Due to their different geometries and the varying physical conditions in the circumstellar disc, Be/X-ray binaries can present very different states of ...
... Most Be/X-ray binaries have relatively eccentric orbits, and the neutron star companion is normally far away from the disc surrounding the Be star. Due to their different geometries and the varying physical conditions in the circumstellar disc, Be/X-ray binaries can present very different states of ...
AAVSO: Mu Cephei, October 2002 Variable Star Of The Month
... Mu Cephei has not quite reached the point of a supernova explosion, although it may be close. Mu Cep has expanded and cooled and is currently in its red supergiant phase of life. Like other red giants and supergiants, it is unstable and it pulsates. Right now the radial (in-and-out) pulsations are o ...
... Mu Cephei has not quite reached the point of a supernova explosion, although it may be close. Mu Cep has expanded and cooled and is currently in its red supergiant phase of life. Like other red giants and supergiants, it is unstable and it pulsates. Right now the radial (in-and-out) pulsations are o ...
Stars
... The brightest star in the sky (besides the Sun) is Sirius. It is 2.6 pc from Earth. How long does it take light from Sirius to reach us? ...
... The brightest star in the sky (besides the Sun) is Sirius. It is 2.6 pc from Earth. How long does it take light from Sirius to reach us? ...
Chapter 13 The Stellar Graveyard
... Because the mass of white dwarfs when they explode as supernovae is always around 1.0 M⊙, its luminosity is very consistent, and can be used as a standard candle for the measurement of distance to distant galaxies (Chapter 15). The amount of energy produced by white dwarf supernovae and massive star ...
... Because the mass of white dwarfs when they explode as supernovae is always around 1.0 M⊙, its luminosity is very consistent, and can be used as a standard candle for the measurement of distance to distant galaxies (Chapter 15). The amount of energy produced by white dwarf supernovae and massive star ...
Manual - Physics
... where you have a clear view of some object or vista that is at least 1/4-mile away. It is not critical that the base be exactly level, but it should be placed on somewhat flat ground or pavement to ensure smooth movement of the telescope. Keep in mind that the SkyQuest XT4.5 was designed specificall ...
... where you have a clear view of some object or vista that is at least 1/4-mile away. It is not critical that the base be exactly level, but it should be placed on somewhat flat ground or pavement to ensure smooth movement of the telescope. Keep in mind that the SkyQuest XT4.5 was designed specificall ...
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.