Chapter 27
... • This picture was taken by pointing the Hubble telescope at a tiny region of space, empty of nearby stars or galaxies. • It required combining many hours of observations to make this picture. • More than 10,000 galaxies are found in this picture! March 21, 2006 ...
... • This picture was taken by pointing the Hubble telescope at a tiny region of space, empty of nearby stars or galaxies. • It required combining many hours of observations to make this picture. • More than 10,000 galaxies are found in this picture! March 21, 2006 ...
SearchCal: a Virtual Observatory tool for searching - HAL-Insu
... where ∆µ2 ≃ ∆µ2 target ≃ ∆µ2 cal is the uncertainty on the measurement of the visibility amplitudes. Equation 3 shows that the expected accuracy on the target visibility strongly depends on the accuracy of the calibrator visibility. A calibrator is a star for which the visibility is known (or can be ...
... where ∆µ2 ≃ ∆µ2 target ≃ ∆µ2 cal is the uncertainty on the measurement of the visibility amplitudes. Equation 3 shows that the expected accuracy on the target visibility strongly depends on the accuracy of the calibrator visibility. A calibrator is a star for which the visibility is known (or can be ...
10 Measuring The Stars
... of visual binaries can be observed directly; Doppler shifts in spectroscopic binaries allow measurement of motion; and the period of eclipsing binaries can be measured using intensity variations. Copyright © 2010 Pearson Education, Inc. ...
... of visual binaries can be observed directly; Doppler shifts in spectroscopic binaries allow measurement of motion; and the period of eclipsing binaries can be measured using intensity variations. Copyright © 2010 Pearson Education, Inc. ...
SCIN 293-PL-New Course
... Objective 1: Compare the steps of formation, fusion processes and distinctive deaths of starts of different mass. Lesson 1: Properties of stars Topic 1: Describing stars in the sky Topic 2: Formation of stars in molecular clouds Topic 3: The lives of stars of all masses Topic 4: Star death and remna ...
... Objective 1: Compare the steps of formation, fusion processes and distinctive deaths of starts of different mass. Lesson 1: Properties of stars Topic 1: Describing stars in the sky Topic 2: Formation of stars in molecular clouds Topic 3: The lives of stars of all masses Topic 4: Star death and remna ...
Young Galaxies Grow - Astronomical Society of the Pacific
... images of the galaxy. Ultravioletbright, thin structures stretch to almost five times the galaxy’s optical radius. • Another spiral galaxy showed a similar extended Ultraviolet disk. So astronomers began to look at several such galaxies with GALEX; one third appeared larger in UV than in visible li ...
... images of the galaxy. Ultravioletbright, thin structures stretch to almost five times the galaxy’s optical radius. • Another spiral galaxy showed a similar extended Ultraviolet disk. So astronomers began to look at several such galaxies with GALEX; one third appeared larger in UV than in visible li ...
Article PDF - IOPscience
... demonstrated the feasibility of this method in nuclear SN detection. The subtracted images show a clear point source (with its peak at the ∼20 j and ∼7 j levels in the September 13–15 and September 27 epochs, respectively) at 1.14⬙ east and 0.78⬙ north from the K s-band nucleus of the galaxy (see Fi ...
... demonstrated the feasibility of this method in nuclear SN detection. The subtracted images show a clear point source (with its peak at the ∼20 j and ∼7 j levels in the September 13–15 and September 27 epochs, respectively) at 1.14⬙ east and 0.78⬙ north from the K s-band nucleus of the galaxy (see Fi ...
Deep fields around bright stars (“Galaxies around Stars”)
... Galaxies observed in the Northern and Southern Hubble Deep Fields (composite colors from blue, yellow and near-IR filters). ...
... Galaxies observed in the Northern and Southern Hubble Deep Fields (composite colors from blue, yellow and near-IR filters). ...
Lecture 1
... 1922: First observations of diffuse interstellar bands (DIBs) by American astronomer Mary Lea Heger (while graduate student at Lick Observatory!). 1934: Paul Merrill discovers many more DIBs and show unequivocally that their origin is interstellar. More than 250 DIBs known today. ...
... 1922: First observations of diffuse interstellar bands (DIBs) by American astronomer Mary Lea Heger (while graduate student at Lick Observatory!). 1934: Paul Merrill discovers many more DIBs and show unequivocally that their origin is interstellar. More than 250 DIBs known today. ...
Ch_16-18_Example_Exam
... ____ 29. What is the meaning of the Schwarzschild radius around a black hole? a. It is the radius at which an orbiting object would show a precession. b. It is the radius at which gravitational redshift can be detected. c. It is the radius at which the black hole’s spin equals the speed of light. d. ...
... ____ 29. What is the meaning of the Schwarzschild radius around a black hole? a. It is the radius at which an orbiting object would show a precession. b. It is the radius at which gravitational redshift can be detected. c. It is the radius at which the black hole’s spin equals the speed of light. d. ...
MAGNITUDE AND COLOR SYSTEMS
... professional astronomers because there is not one magnitude system but instead several. For historical reasons within subfields, the definitions differ in two ways: (1) The spectral flux density can be expressed either as fν (ν) or fλ (λ). (2) The normalizing constant Q(i) differs among the systems; ...
... professional astronomers because there is not one magnitude system but instead several. For historical reasons within subfields, the definitions differ in two ways: (1) The spectral flux density can be expressed either as fν (ν) or fλ (λ). (2) The normalizing constant Q(i) differs among the systems; ...
STScI 2005
... • Stars generally form with a frequency that decreases with increasing mass for masses greater than ~1 M: ...
... • Stars generally form with a frequency that decreases with increasing mass for masses greater than ~1 M: ...
Trojan clusters objects
... This is a type of 3D objects (for instance “XXIth Century Station” for the ISS or “Asteroid” for an asteroid template). It is used to instantiate 3D objects without having to specify all recurring physical parameters every time. ...
... This is a type of 3D objects (for instance “XXIth Century Station” for the ISS or “Asteroid” for an asteroid template). It is used to instantiate 3D objects without having to specify all recurring physical parameters every time. ...
Lyra - columbusastronomy
... The women got mad and hurled rocks at the bard that tamed the sound of the Lyre. The women dismembered Orpheus, throwing his lyre and his head into the river Hebrus. The Muses gathered up his limbs and buried them, and Orpheus went to the underworld to spend eternity with Eurydice. Jupiter himself c ...
... The women got mad and hurled rocks at the bard that tamed the sound of the Lyre. The women dismembered Orpheus, throwing his lyre and his head into the river Hebrus. The Muses gathered up his limbs and buried them, and Orpheus went to the underworld to spend eternity with Eurydice. Jupiter himself c ...
The Milky Way Model - University of Chicago
... question: was the Milky Way the whole entire universe or was it just one of many “island universes” located within a much greater system? Eventually a famous astronomer, Edwin Hubble was able to use a powerful telescope to resolve the stars in these spiral nebulae - ending the debate - and measure t ...
... question: was the Milky Way the whole entire universe or was it just one of many “island universes” located within a much greater system? Eventually a famous astronomer, Edwin Hubble was able to use a powerful telescope to resolve the stars in these spiral nebulae - ending the debate - and measure t ...
March 2011
... from Earth at the beginning of March. Earth rotates anticlockwise therefore objects will appear over the eastern horizon in the morning in sequence starting from Venus. They will disappear over the western horizon in the evening in sequence starting with the Sun and followed by Mercury. MERCURY sets ...
... from Earth at the beginning of March. Earth rotates anticlockwise therefore objects will appear over the eastern horizon in the morning in sequence starting from Venus. They will disappear over the western horizon in the evening in sequence starting with the Sun and followed by Mercury. MERCURY sets ...
5 Understanding stars and star ClUsters
... being converted to helium is 6.4 × 1018 ergs of energy. In the Sun, a rather modest star, 4 × 1033 ergs of energy are being produced each second. This is equivalent to the energy produced by 6 trillion Hiroshima-sized bombs exploding each second. It means that each second 600 million tons of hydroge ...
... being converted to helium is 6.4 × 1018 ergs of energy. In the Sun, a rather modest star, 4 × 1033 ergs of energy are being produced each second. This is equivalent to the energy produced by 6 trillion Hiroshima-sized bombs exploding each second. It means that each second 600 million tons of hydroge ...
Star Formation in Lynds Dark Nebulae
... beginning of time (Yan, 05). Dust found in molecular clouds is crucial to the star formation process, as it allows gas to condense into pre-stellar cores and evolve into YSOs, or young stellar objects (Greene, 01). Research by Carballo (1992) identified new candidate YSOs in Scorpio-Centaurus Lupus, ...
... beginning of time (Yan, 05). Dust found in molecular clouds is crucial to the star formation process, as it allows gas to condense into pre-stellar cores and evolve into YSOs, or young stellar objects (Greene, 01). Research by Carballo (1992) identified new candidate YSOs in Scorpio-Centaurus Lupus, ...
Infrared colours, distance determination and absolute magnitudes of
... of the main sequence, consistent with moderate (",20 per cent) contamination of the secondary light by an accretion disc. We use the K magnitudes to estimate the distances of the stars. We show that most lie within about 400 pc, and only two of the stars in our sample (RU LMi and DO Leo) are convinc ...
... of the main sequence, consistent with moderate (",20 per cent) contamination of the secondary light by an accretion disc. We use the K magnitudes to estimate the distances of the stars. We show that most lie within about 400 pc, and only two of the stars in our sample (RU LMi and DO Leo) are convinc ...
the chromospheres of classical cepheids. 111. a search for transition
... In previous studies of Cepheid chromospheres with the IUE,we found that the chromospheric emission is strongly dependent on the period of the star and varies substantially through the cycle. For the shortest period star in our sample, 6 Cep, we were able to detect little significant chromospheric em ...
... In previous studies of Cepheid chromospheres with the IUE,we found that the chromospheric emission is strongly dependent on the period of the star and varies substantially through the cycle. For the shortest period star in our sample, 6 Cep, we were able to detect little significant chromospheric em ...
The Carina Dwarf Spheroidal Galaxy: A Goldmine for Cosmology
... cosmological simulations predict dwarf satellite populations significantly larger than the number of dwarfs observed near giant spirals like the Milky Way and M31. This discrepancy is known as the missing satellite problem and challenges the current most popular cosmological model: the Lambda Cold ...
... cosmological simulations predict dwarf satellite populations significantly larger than the number of dwarfs observed near giant spirals like the Milky Way and M31. This discrepancy is known as the missing satellite problem and challenges the current most popular cosmological model: the Lambda Cold ...
Another cluster of red supergiants close to RSGC1
... especially for supergiants, but also for very late giants. Most supergiants have higher EWCO than most giants, but there are a few exceptions in both directions. This is, in part, not so surprising, because some AGB stars are as luminous as some supergiants (van Loon et al. 2005). Our sample almost ...
... especially for supergiants, but also for very late giants. Most supergiants have higher EWCO than most giants, but there are a few exceptions in both directions. This is, in part, not so surprising, because some AGB stars are as luminous as some supergiants (van Loon et al. 2005). Our sample almost ...
Measuring the masses of clusters
... •! Calculated mass-to-light ratio and determined that about 90% of the mass necessary to account for observed ratio was missing and therefore invisible, or "dark". But nobody believed him … ...
... •! Calculated mass-to-light ratio and determined that about 90% of the mass necessary to account for observed ratio was missing and therefore invisible, or "dark". But nobody believed him … ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.