ch19
... Galactic Center: Sagittarius A* At the center of our galaxy resides a supermassive black hole named Sagittarius A*. Because of interstellar extinction most of our information on Sgr A* comes from IR and radio ...
... Galactic Center: Sagittarius A* At the center of our galaxy resides a supermassive black hole named Sagittarius A*. Because of interstellar extinction most of our information on Sgr A* comes from IR and radio ...
a transiting planet of a sun-like star
... than those of the survey cameras, the E.T. observations reduced the likelihood that XO-1 was a dilute triple system; that is, one star with a fainter, eclipsing binary nearby, which can mimic a transiting planet (Charbonneau et al. 2004). On the basis of the E.T. light curves of 2005, we acquired sp ...
... than those of the survey cameras, the E.T. observations reduced the likelihood that XO-1 was a dilute triple system; that is, one star with a fainter, eclipsing binary nearby, which can mimic a transiting planet (Charbonneau et al. 2004). On the basis of the E.T. light curves of 2005, we acquired sp ...
an Educator`s GuidE
... are nearly impossible to photograph in the traditional sense, so we have to find them by observing the effects they have on their parent stars. These effects, driven by gravity and line-of-sight, are visible to us as either periodic dimming (called “transits”) or shifting wavelengths within the elec ...
... are nearly impossible to photograph in the traditional sense, so we have to find them by observing the effects they have on their parent stars. These effects, driven by gravity and line-of-sight, are visible to us as either periodic dimming (called “transits”) or shifting wavelengths within the elec ...
an Educator`s GuidE - Museum of Science, Boston
... are nearly impossible to photograph in the traditional sense, so we have to find them by observing the effects they have on their parent stars. These effects, driven by gravity and line-of-sight, are visible to us as either periodic dimming (called “transits”) or shifting wavelengths within the elec ...
... are nearly impossible to photograph in the traditional sense, so we have to find them by observing the effects they have on their parent stars. These effects, driven by gravity and line-of-sight, are visible to us as either periodic dimming (called “transits”) or shifting wavelengths within the elec ...
Direct Imaging Searches Around White Dwarfs - X
... • Will evolve after 1.75Gyr to a 0.58Msun white dwarf • Planet orbits expand by factor ~3 to ~200AU,~120AU & 75AU • Let WD cool to 10,000K over ~0.5Gyr….system age now 2.25Gyr… • 10Mjup planet will be J=23.8 @39pc, or J=22.4 @ 20pc – How common are HR8799-like systems? ...
... • Will evolve after 1.75Gyr to a 0.58Msun white dwarf • Planet orbits expand by factor ~3 to ~200AU,~120AU & 75AU • Let WD cool to 10,000K over ~0.5Gyr….system age now 2.25Gyr… • 10Mjup planet will be J=23.8 @39pc, or J=22.4 @ 20pc – How common are HR8799-like systems? ...
Question 1
... The location of the Galactic center was identified early in the 20th century using a) supernova remnants. b) white dwarf stars in the spiral arms. c) red giant variable stars in globular clusters. d) bright O and B stars in open clusters. e) X-ray sources. Explanation: Harlow Shapley used pulsating ...
... The location of the Galactic center was identified early in the 20th century using a) supernova remnants. b) white dwarf stars in the spiral arms. c) red giant variable stars in globular clusters. d) bright O and B stars in open clusters. e) X-ray sources. Explanation: Harlow Shapley used pulsating ...
Astro Midterm Review Part II: Ch 2
... A) you need an array, like the VLA, to detect ANY radio radiation, so it is just not realistic to put an entire array in space. B) radio telescopes are too fragile and expensive to make to put into space. C) radio waves penetrate Earth's atmosphere so there is no need to put one in space. D) there i ...
... A) you need an array, like the VLA, to detect ANY radio radiation, so it is just not realistic to put an entire array in space. B) radio telescopes are too fragile and expensive to make to put into space. C) radio waves penetrate Earth's atmosphere so there is no need to put one in space. D) there i ...
Star Classification and its Connection to Exoplanets.
... 114762, they noticed a slight wobble. This slight wobble resulted from a gravitational pull from some other celestial body, and astronomers concluded that it must be either a brown dwarf or a planet. Although today, astronomers believe that HD 114762 b is a brown dwarf due to more precise measuremen ...
... 114762, they noticed a slight wobble. This slight wobble resulted from a gravitational pull from some other celestial body, and astronomers concluded that it must be either a brown dwarf or a planet. Although today, astronomers believe that HD 114762 b is a brown dwarf due to more precise measuremen ...
Galaxy Hunters Article, Cosmology Information, First Star Facts
... largest meetings ever devoted to the origin of galaxies. The first star was born about 14 billion years ago, Abel believes, in a universe that was more mysterious but also far simpler than our own. Smaller and denser than today, the universe was pitch-black and contained mostly hydrogen and helium w ...
... largest meetings ever devoted to the origin of galaxies. The first star was born about 14 billion years ago, Abel believes, in a universe that was more mysterious but also far simpler than our own. Smaller and denser than today, the universe was pitch-black and contained mostly hydrogen and helium w ...
Metallicity, Age, and Mass of Star Forming Galaxies at z~3
... If the star (or stellar population) is sufficiently young and massive to produce ionizing photons, a common method is to measure the deviation of hydrogen recombination line ratios from theoretical expectations. These have well established values, that vary typically less than 10%-15% for a large ra ...
... If the star (or stellar population) is sufficiently young and massive to produce ionizing photons, a common method is to measure the deviation of hydrogen recombination line ratios from theoretical expectations. These have well established values, that vary typically less than 10%-15% for a large ra ...
Titan`s Methane Weather
... these wavelengths there is no hope of probing deeply into Titan’s atmosphere, but in the narrow wavelength “windows” between methane absorption bands, observers could probe all the way to the surface. This led several observing teams to use the Hubble Space Telescope and telescopes here on Earth to ...
... these wavelengths there is no hope of probing deeply into Titan’s atmosphere, but in the narrow wavelength “windows” between methane absorption bands, observers could probe all the way to the surface. This led several observing teams to use the Hubble Space Telescope and telescopes here on Earth to ...
The resolved stellar populations of M32 Monachesi, Antonela
... detail how we obtained the most detailed CMD of this galaxy yet constructed to date. Our field has an extent of 2900 × 2600 and it is located at 20 from the galactic center. We find that this CMD has a wealth of features that reveal the different stellar populations present in M32. With the aid of e ...
... detail how we obtained the most detailed CMD of this galaxy yet constructed to date. Our field has an extent of 2900 × 2600 and it is located at 20 from the galactic center. We find that this CMD has a wealth of features that reveal the different stellar populations present in M32. With the aid of e ...
Dishing Up the Data: The Role of Australian Space Tracking and
... Goldstone, California. In order to maintain continuous communications with lunar and planetary spacecraft, a minimum of three tracking stations, located around the globe at approximately 120° apart, is required to ensure that a spacecraft remains under constant observation despite the rotation of E ...
... Goldstone, California. In order to maintain continuous communications with lunar and planetary spacecraft, a minimum of three tracking stations, located around the globe at approximately 120° apart, is required to ensure that a spacecraft remains under constant observation despite the rotation of E ...
Survey of Astrophysics A110 The Milky Way Galaxy
... – 1. A regular spherical shape (round) with the stars more closely packed toward the center. – 2. Contain 104 to 106 stars per cluster. – 3. Spatial densities (ie stars per cubic parsec) are much higher (million times) than near the Sun. – 3. They are found in the Galactic halo. – 4. Spectral analys ...
... – 1. A regular spherical shape (round) with the stars more closely packed toward the center. – 2. Contain 104 to 106 stars per cluster. – 3. Spatial densities (ie stars per cubic parsec) are much higher (million times) than near the Sun. – 3. They are found in the Galactic halo. – 4. Spectral analys ...
orion® StarBlast 6 astro telescope
... lights will greatly impair your dark-adapted night vision. Avoid viewing over rooftops and chimneys, as they often have warm air currents rising from them. Similarly, avoid observing from indoors through an open (or closed) window, because the temperature difference between the indoor and outdoor ai ...
... lights will greatly impair your dark-adapted night vision. Avoid viewing over rooftops and chimneys, as they often have warm air currents rising from them. Similarly, avoid observing from indoors through an open (or closed) window, because the temperature difference between the indoor and outdoor ai ...
General Astrophysics And Comparative Planetology
... Earth-sized based only on visual observations and an assumed surface reflectance. This estimate was reduced when Pluto’s icy nature was guessed. Finally the Charon-Pluto eclipses during the late 1980s constrained Pluto’s radius to be much smaller—0.18 Earth radii. Sedna is a recently discovered smal ...
... Earth-sized based only on visual observations and an assumed surface reflectance. This estimate was reduced when Pluto’s icy nature was guessed. Finally the Charon-Pluto eclipses during the late 1980s constrained Pluto’s radius to be much smaller—0.18 Earth radii. Sedna is a recently discovered smal ...
CH. 7 - science1d
... the stars. The next nearest star to Earth after the Sun is actually part of a group of three stars that orbit each other. This group is called the Centauri system (Figure 7.8). It lies about 4.3 ly away from the solar system. If it were possible for you to have a cellphone conversation with someone ...
... the stars. The next nearest star to Earth after the Sun is actually part of a group of three stars that orbit each other. This group is called the Centauri system (Figure 7.8). It lies about 4.3 ly away from the solar system. If it were possible for you to have a cellphone conversation with someone ...
Christiaan Huygens and his telescopes
... especially much longer ones. During his Paris period, Christiaan had seen and used the telescopes that the astronomer Cassini used at the Paris Royal Observatory. These had objective lenses with very long focal lengths, from 17 feet up to 100 and even 140 feet. They were made by the famous Italian l ...
... especially much longer ones. During his Paris period, Christiaan had seen and used the telescopes that the astronomer Cassini used at the Paris Royal Observatory. These had objective lenses with very long focal lengths, from 17 feet up to 100 and even 140 feet. They were made by the famous Italian l ...
Why there are apparently so few debris disks among post
... Following the popular coagulation of dust theory of planetary formation, planets are formed inside disks around young stars. Initial disks contain gas and dust where dust is formed by micrometric sized particles radiating mainly in the far-IR. This is at least the case of Classical T Tauri stars (CT ...
... Following the popular coagulation of dust theory of planetary formation, planets are formed inside disks around young stars. Initial disks contain gas and dust where dust is formed by micrometric sized particles radiating mainly in the far-IR. This is at least the case of Classical T Tauri stars (CT ...
The absence of CO from the dust peak around ϵ Eri
... Assuming that the gas and dust are thermalized with an equilibrium temperature of 35 K (Dent et al. 2000), the formalism of Knapp et al. (1980) allows the conversion of the observed 3σ upper limit of 0.0156 K km s−1 (in units of T mb now) into a column density of CO molecules of 8.7 × 1011 cm−2 , im ...
... Assuming that the gas and dust are thermalized with an equilibrium temperature of 35 K (Dent et al. 2000), the formalism of Knapp et al. (1980) allows the conversion of the observed 3σ upper limit of 0.0156 K km s−1 (in units of T mb now) into a column density of CO molecules of 8.7 × 1011 cm−2 , im ...
Primary and secondary eclipse spectroscopy with JWST: exploring
... or ices, of non-solar composition. This volatile content represents a small fraction of the total planetary mass and is fractionated between the interior (crust, mantle), the surface oceans and/or ice sheets, the atmosphere and outer space through gravitational escape (induced by impacts, exospheric ...
... or ices, of non-solar composition. This volatile content represents a small fraction of the total planetary mass and is fractionated between the interior (crust, mantle), the surface oceans and/or ice sheets, the atmosphere and outer space through gravitational escape (induced by impacts, exospheric ...
High-Mass Star Formation
... L/M is 100x higher than estimates from CO and has a smaller dispersion L/M 2x higher for cores with UCHII and/or HII regions Lbol strongly correlates with Mvir. Combined with low dispersion of L/M perhaps indicates that mass of most massive star is related to the mass of the core ...
... L/M is 100x higher than estimates from CO and has a smaller dispersion L/M 2x higher for cores with UCHII and/or HII regions Lbol strongly correlates with Mvir. Combined with low dispersion of L/M perhaps indicates that mass of most massive star is related to the mass of the core ...
Lecture 15a - Sierra College Astronomy Home Page
... “They are out there, but they haven’t gotten here yet” 0.5 million years (fast robot probes, fastest biological exploration) 5 million years (slow robot probes) 50 million years (slow biological exploration) 10 billion years Instead, it would be vastly more likely that if even one other civilizatio ...
... “They are out there, but they haven’t gotten here yet” 0.5 million years (fast robot probes, fastest biological exploration) 5 million years (slow robot probes) 50 million years (slow biological exploration) 10 billion years Instead, it would be vastly more likely that if even one other civilizatio ...
Chapter 16 - Astronomy
... formed. When we look at a spiral galaxy, the arms are obvious to us because they are the areas containing the bright stars. 6. One problem with the density wave theory is the question of how the density wave is sustained through the life of the galaxy. Also, observations of the Whirlpool Galaxy show ...
... formed. When we look at a spiral galaxy, the arms are obvious to us because they are the areas containing the bright stars. 6. One problem with the density wave theory is the question of how the density wave is sustained through the life of the galaxy. Also, observations of the Whirlpool Galaxy show ...
Bad Seeing Bad Focus Bad Guiding
... What to do: 9 One should keep in mind that guiding is a second order correction for the location on the sky in which is telescope is pointing. The first order correction is, of course, tracking. If the tracking is not working well, it will be next to impossible to obtain good images, regardless of ...
... What to do: 9 One should keep in mind that guiding is a second order correction for the location on the sky in which is telescope is pointing. The first order correction is, of course, tracking. If the tracking is not working well, it will be next to impossible to obtain good images, regardless of ...
Spitzer Space Telescope
The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003. It is the fourth and final of the NASA Great Observatories program.The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted. This occurred on 15 May 2009. Without liquid helium to cool the telescope to the very low temperatures needed to operate, most of the instruments are no longer usable. However, the two shortest-wavelength modules of the IRAC camera are still operable with the same sensitivity as before the cryogen was exhausted, and will continue to be used in the Spitzer Warm Mission. All Spitzer data, from both the primary and warm phases, are archived at the Infrared Science Archive (IRSA).In keeping with NASA tradition, the telescope was renamed after its successful demonstration of operation, on 18 December 2003. Unlike most telescopes that are named after famous deceased astronomers by a board of scientists, the new name for SIRTF was obtained from a contest open to the general public.The contest led to the telescope being named in honor of astronomer Lyman Spitzer, who had promoted the concept of space telescopes in the 1940s. Spitzer wrote a 1946 report for RAND Corporation describing the advantages of an extraterrestrial observatory and how it could be realized with available or upcoming technology. He has been cited for his pioneering contributions to rocketry and astronomy, as well as ""his vision and leadership in articulating the advantages and benefits to be realized from the Space Telescope Program.""The US$800 million Spitzer was launched from Cape Canaveral Air Force Station, on a Delta II 7920H ELV rocket, Monday, 25 August 2003 at 13:35:39 UTC-5 (EDT).It follows a heliocentric instead of geocentric orbit, trailing and drifting away from Earth's orbit at approximately 0.1 astronomical unit per year (a so-called ""earth-trailing"" orbit). The primary mirror is 85 centimeters (33 in) in diameter, f/12, made of beryllium and is cooled to 5.5 K (−449.77 °F). The satellite contains three instruments that allow it to perform astronomical imaging and photometry from 3 to 180 micrometers, spectroscopy from 5 to 40 micrometers, and spectrophotometry from 5 to 100 micrometers.