Lecture-25 Notes - Georgia Southern University Astrophysics
... 4) “Regular” galaxy clusters are ~spherical, centrally concentrated, very massive, and are dominated by large ellipticals/S0’s in their cores. Spirals are found in the outskirts. Large amounts of ~107 K X-ray emitting gas is present. 5) “Irregular” clusters are smaller, looser, and dominated by spir ...
... 4) “Regular” galaxy clusters are ~spherical, centrally concentrated, very massive, and are dominated by large ellipticals/S0’s in their cores. Spirals are found in the outskirts. Large amounts of ~107 K X-ray emitting gas is present. 5) “Irregular” clusters are smaller, looser, and dominated by spir ...
Astrometric accuracy during the past 2000 years
... After four centuries with gradual improvements another much larger jump in accuracy was obtained by the ESA satellite giving the Hipparcos and Tycho-2 catalogues containing a total of 2.5 million stars. Detailed explanation Errors of star position coordinates and parallaxes in accurate catalogues ar ...
... After four centuries with gradual improvements another much larger jump in accuracy was obtained by the ESA satellite giving the Hipparcos and Tycho-2 catalogues containing a total of 2.5 million stars. Detailed explanation Errors of star position coordinates and parallaxes in accurate catalogues ar ...
oC - geogreenapps
... made to face the right, 80 U to be e..ily kept in view while Itudymc the leIBoD8 that follow. It is confidently belieYed that the peculiariti. of thi. work are I1lOh as will oommend it to geDeral favor, and laoure for it mcreuing popularity, and an en viable and luting reputatioD. 1. In the first pl ...
... made to face the right, 80 U to be e..ily kept in view while Itudymc the leIBoD8 that follow. It is confidently belieYed that the peculiariti. of thi. work are I1lOh as will oommend it to geDeral favor, and laoure for it mcreuing popularity, and an en viable and luting reputatioD. 1. In the first pl ...
Recen t Scien ti c
... transients (SXT) and Be/X-ray binaries seen in the Milky Way Galaxy. We have observed some of these transient sources with the HST when they are X-ray bright, and again when they become X-ray dim to look for corresponding changes in the optical band to help identify these objects and conrm their cl ...
... transients (SXT) and Be/X-ray binaries seen in the Milky Way Galaxy. We have observed some of these transient sources with the HST when they are X-ray bright, and again when they become X-ray dim to look for corresponding changes in the optical band to help identify these objects and conrm their cl ...
- National Optical Astronomy Observatory
... information to determine the desired stepping rate for the limb guider translation stage and the number of spectral frame to collect. (Take into account that one slit width is about half an arcsecond and the diffraction limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0 ...
... information to determine the desired stepping rate for the limb guider translation stage and the number of spectral frame to collect. (Take into account that one slit width is about half an arcsecond and the diffraction limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0 ...
structure and evolution of white dwarfs and their
... higher than Sirius A, it was apparently 1000 times less luminous. This result could only be explained if Sirius B had a very small radius, 1/100R~ and similar to that of the Earth. However, with a known mass of ~1M~ for Sirius B, the implied density of 1400 Tonnes m-3 was well above that of any form ...
... higher than Sirius A, it was apparently 1000 times less luminous. This result could only be explained if Sirius B had a very small radius, 1/100R~ and similar to that of the Earth. However, with a known mass of ~1M~ for Sirius B, the implied density of 1400 Tonnes m-3 was well above that of any form ...
chapter 15 navigational astronomy
... The principal bodies orbiting the Sun are called planets. Nine principal planets are known: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Of these, only four are commonly used for celestial navigation: Venus, Mars, Jupiter, and Saturn. Except for Pluto, the orbits of the ...
... The principal bodies orbiting the Sun are called planets. Nine principal planets are known: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Of these, only four are commonly used for celestial navigation: Venus, Mars, Jupiter, and Saturn. Except for Pluto, the orbits of the ...
Ch17_Galaxies
... gravity is a prediction of Einstein’s general theory of relativity • The bending light creates multiple quasar images and arcs that can be used to determine the mass of the massive object ...
... gravity is a prediction of Einstein’s general theory of relativity • The bending light creates multiple quasar images and arcs that can be used to determine the mass of the massive object ...
Star formation rates from young-star counts and the structure of the
... note that, given the steep dependence on SFR and the low number counts, distinguishing between a threshold and this power law is difficult and almost a matter of semantics. The work by Gutermuth et al. (2011) is the Galactic study that can be compared most directly to the NGC 346 analysis we prese ...
... note that, given the steep dependence on SFR and the low number counts, distinguishing between a threshold and this power law is difficult and almost a matter of semantics. The work by Gutermuth et al. (2011) is the Galactic study that can be compared most directly to the NGC 346 analysis we prese ...
Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... synthesised in the merger of a helium white dwarf and a carbonoxygen white dwarf. Which of the above-mentioned sources is the most important one is currently under debate. In spite of the many uncertainties regarding the origin of F in the Galaxy, there have not been many observational studies of th ...
... synthesised in the merger of a helium white dwarf and a carbonoxygen white dwarf. Which of the above-mentioned sources is the most important one is currently under debate. In spite of the many uncertainties regarding the origin of F in the Galaxy, there have not been many observational studies of th ...
The Kuiper Belt Explored by Serendipitous Stellar Occultations
... Consequently, the stellar occultation method can provide the temperature, pressure, and density profiles of a planetary atmosphere with a typical vertical resolution of a few kilometers. Furthermore, depending on the quality and completeness of the dataset, this technique has sometimes been applied ...
... Consequently, the stellar occultation method can provide the temperature, pressure, and density profiles of a planetary atmosphere with a typical vertical resolution of a few kilometers. Furthermore, depending on the quality and completeness of the dataset, this technique has sometimes been applied ...
Cycles of magnetic activity in solar-type stars. The place of the Sun
... on the Hertzsprung-Russell diagram. Stars which are close to the ZAMS in Figure 1 have the lowest age among all other stars: log(Age/yr) is about 8 - 8.5. The older the star is, the farther it is from the ZAMS. Ages of stars in the Figure 1 varies from 108 to 1010 years. We can also see that some st ...
... on the Hertzsprung-Russell diagram. Stars which are close to the ZAMS in Figure 1 have the lowest age among all other stars: log(Age/yr) is about 8 - 8.5. The older the star is, the farther it is from the ZAMS. Ages of stars in the Figure 1 varies from 108 to 1010 years. We can also see that some st ...
Quiescent and flaring X-ray emission from the nearby M/T dwarf
... quasi-quiescent emission over the total exposure time. Light curves were obtained from the PN data in the 0.2–2.0 keV band and binned to 100 s and are plotted separately for the source region and for the background. The black histogram in the upper panel is the count rate from the source with 1 σ er ...
... quasi-quiescent emission over the total exposure time. Light curves were obtained from the PN data in the 0.2–2.0 keV band and binned to 100 s and are plotted separately for the source region and for the background. The black histogram in the upper panel is the count rate from the source with 1 σ er ...
celestial navigation heaven`s guide for mere
... largest known type of star and can rarely be found. When supergiant stars die, they undergo a supernova explosion and become black holes. Besides that, under the faint and virtually dead stars group, there are four other sub-groups namely white dwarfs, brown dwarfs, neutron stars and pulsars. A whi ...
... largest known type of star and can rarely be found. When supergiant stars die, they undergo a supernova explosion and become black holes. Besides that, under the faint and virtually dead stars group, there are four other sub-groups namely white dwarfs, brown dwarfs, neutron stars and pulsars. A whi ...
telescopes - NPZ Optics
... The mount head has a clock drive embedded, which enables tracking of celestial objects with user defined speed. The speed is set by a hand controller and has three tracking rates: solar, lunar and stellar, as well as two additional correction speeds acceleration and deceleration at 50%. Hand control ...
... The mount head has a clock drive embedded, which enables tracking of celestial objects with user defined speed. The speed is set by a hand controller and has three tracking rates: solar, lunar and stellar, as well as two additional correction speeds acceleration and deceleration at 50%. Hand control ...
THE HELIACAL RISE OF SIRIUS- Algorithm
... August 18 Very clear night. 1:20 to 4:30 AM Aurora Borealis… At 5:35 AM Sirius twinkled once only at the absolute limit of my vision. The altitude of the Sun was -6° and Sirius: +1.4° Their azimuthal distance (dAZ) was: 54°. At 5:42 AM Sirius twinkled several times again at the absolute limit of my ...
... August 18 Very clear night. 1:20 to 4:30 AM Aurora Borealis… At 5:35 AM Sirius twinkled once only at the absolute limit of my vision. The altitude of the Sun was -6° and Sirius: +1.4° Their azimuthal distance (dAZ) was: 54°. At 5:42 AM Sirius twinkled several times again at the absolute limit of my ...
1 The Hubble Story (10:56)
... versatility has allowed it to make significant contributions to the field. For example, Hubble’s high resolution has been indispensable in the investigation of the gas and dust disks, dubbed proplyds, around the newly born stars in the Orion Nebula. The proplyds may very well be young planetary syst ...
... versatility has allowed it to make significant contributions to the field. For example, Hubble’s high resolution has been indispensable in the investigation of the gas and dust disks, dubbed proplyds, around the newly born stars in the Orion Nebula. The proplyds may very well be young planetary syst ...
The Evolution of Molecular Clouds
... formation of molecular clouds must itself be a rather rapid process, and cannot take many dynamical timescales. Since the timescales for the formation, internal evolution, and destruction of molecular clouds are all of the same order, these processes probably cannot be clearly separated in time, and ...
... formation of molecular clouds must itself be a rather rapid process, and cannot take many dynamical timescales. Since the timescales for the formation, internal evolution, and destruction of molecular clouds are all of the same order, these processes probably cannot be clearly separated in time, and ...
The Young Stars
... are called FU Orionis eruptive variables, or FU Ori objects. The luminosities can reach a few hundred L . The two best studied members of the class, FU Ori and V1057 Cyg, have both exhibited increases in optical brightness by 5–6 mag on timescales of about a year, followed by gradual fading. The fr ...
... are called FU Orionis eruptive variables, or FU Ori objects. The luminosities can reach a few hundred L . The two best studied members of the class, FU Ori and V1057 Cyg, have both exhibited increases in optical brightness by 5–6 mag on timescales of about a year, followed by gradual fading. The fr ...
21. Galaxy Evolution Agenda The Monty Hall Problem/Paradox 21.1
... • Schmidt realized that the emission lines belonged to Hydrogen, but they were highly redshifted. • This object is very (> 1010 light years) far away. • other such objects were subsequently discovered • they were called quasi-stellar radio sources or quasars for short ...
... • Schmidt realized that the emission lines belonged to Hydrogen, but they were highly redshifted. • This object is very (> 1010 light years) far away. • other such objects were subsequently discovered • they were called quasi-stellar radio sources or quasars for short ...
INSTRUCTION MANUAL
... Congratulations on your purchase of the Celestron NexStar! The NexStar ushers in a whole new generation of computer automated technology. Simple and friendly to use, the NexStar is up and running after locating just three bright objects. It’s the perfect combination of power and portability. If you ...
... Congratulations on your purchase of the Celestron NexStar! The NexStar ushers in a whole new generation of computer automated technology. Simple and friendly to use, the NexStar is up and running after locating just three bright objects. It’s the perfect combination of power and portability. If you ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.