Variable Star Spectroscopy 2008
... By far the simplest way to get started in spectroscopy though is just to use a filter cell mounted diffraction grating positioned a few cm in front of the camera sensor to produce a low resolution spectrum (R~ 100 or 50A), similar to those shown on the title slide. This particular grating is the St ...
... By far the simplest way to get started in spectroscopy though is just to use a filter cell mounted diffraction grating positioned a few cm in front of the camera sensor to produce a low resolution spectrum (R~ 100 or 50A), similar to those shown on the title slide. This particular grating is the St ...
Ch 20 Stellar Evolution
... Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) © 2011 Pearson Education, Inc. ...
... Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) © 2011 Pearson Education, Inc. ...
First firm spectral classification of an early-B PMS star
... Published in Astronomy & Astrophysics Letters, 2011, 536, L1 ...
... Published in Astronomy & Astrophysics Letters, 2011, 536, L1 ...
Magnitude of Stars - What`s Out Tonight?
... Except for the Sun, the Moon is the most noticeable object in the sky. It is also the closest celestial body to the Earth and the only natural object to orbit our planet. The Moon circles the Earth counterclockwise about every 29 days, close to a month’s time. This rate and direction of movement mak ...
... Except for the Sun, the Moon is the most noticeable object in the sky. It is also the closest celestial body to the Earth and the only natural object to orbit our planet. The Moon circles the Earth counterclockwise about every 29 days, close to a month’s time. This rate and direction of movement mak ...
The Halo of the Milky Way
... Galactic spheroid population awaits position information and three dimensional space velocities for a representative set of stars in every substructure. Tangential velocities for many stars will be provided by current and planned astrometry missions, but no planned mission will measure stars faint e ...
... Galactic spheroid population awaits position information and three dimensional space velocities for a representative set of stars in every substructure. Tangential velocities for many stars will be provided by current and planned astrometry missions, but no planned mission will measure stars faint e ...
Astronomy and the Coal Age of Alabama
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... by another disk, this one dark and broad in the equatorial region, seemingly almost deprived of luminous stars ; with a similar width, of the order of 1000 light-years, at least [Fig. 1a]. Such a reconstituted shape is by no way exceptional : quite a lot of galaxies, probably spiral as seen edgeon, ...
... by another disk, this one dark and broad in the equatorial region, seemingly almost deprived of luminous stars ; with a similar width, of the order of 1000 light-years, at least [Fig. 1a]. Such a reconstituted shape is by no way exceptional : quite a lot of galaxies, probably spiral as seen edgeon, ...
Observational Data
... the reddenning, thus corrected SFRs for our galaxies. If high SFRs (>100Mo/yr) will be confirmed, it is clear that in a few 100 Myr a full M* galaxy will be assembled. ...
... the reddenning, thus corrected SFRs for our galaxies. If high SFRs (>100Mo/yr) will be confirmed, it is clear that in a few 100 Myr a full M* galaxy will be assembled. ...
The Search for the Earliest Galaxies
... are thought to have first formed, however, continues to be a priority for modern cosmology. Astronomers are still looking to identify the steps that led from the formation of the first stars to the immense collections of stars seen in magnificent galaxies like our Milky Way. In their early views wit ...
... are thought to have first formed, however, continues to be a priority for modern cosmology. Astronomers are still looking to identify the steps that led from the formation of the first stars to the immense collections of stars seen in magnificent galaxies like our Milky Way. In their early views wit ...
November 2015 - Denver Astronomical Society
... NASA Space Place. . . . . . . . . . . . . 5 about 14° above the horizon, and slightly closer; at ...
... NASA Space Place. . . . . . . . . . . . . 5 about 14° above the horizon, and slightly closer; at ...
Low-Res Version - Chandra X
... galaxy. It was formed from a relatively recent (30 million years ago) merger of two smaller galaxies. The merger is causing stars to form, evolve, and explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the mer ...
... galaxy. It was formed from a relatively recent (30 million years ago) merger of two smaller galaxies. The merger is causing stars to form, evolve, and explode at an exceptionally rapid rate, creating the large cloud of multimillion degree Celsius gas seen in this image. The central region of the mer ...
What is the life cycle of a star?
... compressed into a single point, which is called a black hole. • A black hole is an invisible object with gravity so great that nothing, not even light, can escape it. ...
... compressed into a single point, which is called a black hole. • A black hole is an invisible object with gravity so great that nothing, not even light, can escape it. ...
Lesson 3 - The Life Cycle of Stars - Hitchcock
... compressed into a single point, which is called a black hole. • A black hole is an invisible object with gravity so great that nothing, not even light, can escape it. ...
... compressed into a single point, which is called a black hole. • A black hole is an invisible object with gravity so great that nothing, not even light, can escape it. ...
– 1 – 1. Cosmochronology
... one with a suitable lifetime (preferably at least 1 Gyr, ideally a few Gyr, but not more than 5 Gyr, otherwise it doesn’t decay much even over the age of the universe). Unless one is dealing with meteorites, where isotopic abundances can be measured in the lab, the isotope must have detectable spect ...
... one with a suitable lifetime (preferably at least 1 Gyr, ideally a few Gyr, but not more than 5 Gyr, otherwise it doesn’t decay much even over the age of the universe). Unless one is dealing with meteorites, where isotopic abundances can be measured in the lab, the isotope must have detectable spect ...
20_LectureOutline
... when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars—first a hydrogen shell, then a core burning helium to carbon, surrounded by helium- and hydrogen-burning ...
... when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars—first a hydrogen shell, then a core burning helium to carbon, surrounded by helium- and hydrogen-burning ...
SCIN 293-PL-New Course
... Competency 1: Explore the evolution of low mass and high mass stars from birth to death. 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 ...
... Competency 1: Explore the evolution of low mass and high mass stars from birth to death. 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 ...
CHAPTER 12—STELLAR EVOLUTION
... b. hydrogen fusion combined 4 hydrogen nuclei to form 1 helium nucleus. c. pressure does not depend on temperature in degenerate matter. d. the lower limit represents when the radius of the star would be zero. e. there is a minimum temperature for hydrogen fusion. 2. There is a mass-luminosity relat ...
... b. hydrogen fusion combined 4 hydrogen nuclei to form 1 helium nucleus. c. pressure does not depend on temperature in degenerate matter. d. the lower limit represents when the radius of the star would be zero. e. there is a minimum temperature for hydrogen fusion. 2. There is a mass-luminosity relat ...
NASA FUSE Satellite Solves the Case of the Missing Deuterium
... computer models that showed how deuterium, compared to hydrogen, might preferentially bind to interstellar dust grains, changing from an easily detectable gaseous form to an unobservable solid form. The new FUSE data strongly support this theory. In regions that remain undisturbed for long periods, ...
... computer models that showed how deuterium, compared to hydrogen, might preferentially bind to interstellar dust grains, changing from an easily detectable gaseous form to an unobservable solid form. The new FUSE data strongly support this theory. In regions that remain undisturbed for long periods, ...
L6-Diskproperties
... measuring velocities in the Galaxy. This would be the position of the Sun if its motion were completely governed by orbital motion around the Galaxy V = Vy (velocity in direction of galaxy rotation) U = Vx (velocity towards GC) = 10 km/s W = Vz (velocity towards NGP) = 7.2 km/s •V depends on color – ...
... measuring velocities in the Galaxy. This would be the position of the Sun if its motion were completely governed by orbital motion around the Galaxy V = Vy (velocity in direction of galaxy rotation) U = Vx (velocity towards GC) = 10 km/s W = Vz (velocity towards NGP) = 7.2 km/s •V depends on color – ...
Stellar Evolution in the HR Diagram
... Electron degeneracy cannot support cores more massive than 1.4 M. If a degenerate C/O core (i.e., a white dwarf) is pushed above this limit, it was collapse and begin fusing, but it will not have time to adjust its structure (all the energy will just go into lifting the degeneracy). The star will b ...
... Electron degeneracy cannot support cores more massive than 1.4 M. If a degenerate C/O core (i.e., a white dwarf) is pushed above this limit, it was collapse and begin fusing, but it will not have time to adjust its structure (all the energy will just go into lifting the degeneracy). The star will b ...
Activity : Milky Way
... Markers to spiral arms: i) dust The following is to remind us of the value and difficulty in the various markers to spiral arms: This image of the Orion Nebula clearly indicates the dense clouds of dust on this side and the far side of the ‘trapezium’ cluster of young stars. And recall that, even a ...
... Markers to spiral arms: i) dust The following is to remind us of the value and difficulty in the various markers to spiral arms: This image of the Orion Nebula clearly indicates the dense clouds of dust on this side and the far side of the ‘trapezium’ cluster of young stars. And recall that, even a ...
– 1 – 1. Chemical Evolution 1.1.
... believed to originate from degenerate binaries, both singly degenerate and systems where both components are degenerate (doubly degenerate). A detailed understanding of binary star frequency and evolution, including, for example, decay of the binary orbit due to loss of energy by gravitational waves ...
... believed to originate from degenerate binaries, both singly degenerate and systems where both components are degenerate (doubly degenerate). A detailed understanding of binary star frequency and evolution, including, for example, decay of the binary orbit due to loss of energy by gravitational waves ...
Spagna
... Kinematics of Pre-MS population in the Chamaeleon Star Forming Region The Chamaeleon region is one of the most active SFR near the Sun, including 3 large dark clouds (Cha I, Cha II and Cha III) and several small isolated clouds with 100
... Kinematics of Pre-MS population in the Chamaeleon Star Forming Region The Chamaeleon region is one of the most active SFR near the Sun, including 3 large dark clouds (Cha I, Cha II and Cha III) and several small isolated clouds with 100
PPT presentation
... some confusion in early studies of the Virgo intracluster PNs (ICPNs). It turns out that the surface density of Virgo ICPNs is not constant; in some places there are no PNs and all you detect are the contaminants. This is frustrating but it teaches us that the distribution of the ICPNs is far from r ...
... some confusion in early studies of the Virgo intracluster PNs (ICPNs). It turns out that the surface density of Virgo ICPNs is not constant; in some places there are no PNs and all you detect are the contaminants. This is frustrating but it teaches us that the distribution of the ICPNs is far from r ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.