Targets and their Environments - Pathways Towards Habitable Planets
... Luminosity decay more rapid over much larger scale in X-rays than in UV (while optical radiation ...
... Luminosity decay more rapid over much larger scale in X-rays than in UV (while optical radiation ...
L12-no equations
... Spectrum of Crab pulsar is nonthermal. Suggestive of synchrotron radiation - relativistic charged particles emit radiation dependent on particle energy. Charged particles (e-) accelerated along magnetic field lines, radiation is beamed in the the acceleration direction. If axes are not aligned, lead ...
... Spectrum of Crab pulsar is nonthermal. Suggestive of synchrotron radiation - relativistic charged particles emit radiation dependent on particle energy. Charged particles (e-) accelerated along magnetic field lines, radiation is beamed in the the acceleration direction. If axes are not aligned, lead ...
Detecting Habitable Planets around Nearby Sun-Like Stars
... angle of sky in the direction of Cygnus/Lyra. – Stars at average distance of ~1 kpc. • Difficult to follow up by direct detection. ...
... angle of sky in the direction of Cygnus/Lyra. – Stars at average distance of ~1 kpc. • Difficult to follow up by direct detection. ...
7.1 What The Heavens Are Declaring About God`s
... Stars Made The Periodic Chart of the Elements The element H with traces of He and Li is thought to have formed as a result of the Big Bang. All the other elements are thought to have been formed inside stars, the heavier elements from Ne on from supernovas. ...
... Stars Made The Periodic Chart of the Elements The element H with traces of He and Li is thought to have formed as a result of the Big Bang. All the other elements are thought to have been formed inside stars, the heavier elements from Ne on from supernovas. ...
sma_overview - Harvard-Smithsonian Center for Astrophysics
... dust enshrouded sources • SMA observations locate dusty sources to <0.2 arcsec, enable multi- assessment • population of galaxies with extreme star formation when Universe was <20% of current age, invisible to Hubble Space Telescope Younger et al. 2007, 2009, 2010 ...
... dust enshrouded sources • SMA observations locate dusty sources to <0.2 arcsec, enable multi- assessment • population of galaxies with extreme star formation when Universe was <20% of current age, invisible to Hubble Space Telescope Younger et al. 2007, 2009, 2010 ...
The central star of the planetary nebula PB 8: a Wolf-Rayet
... we find that its surface composition is hydrogen-deficient, but not carbon-rich. With mass fractions of 55% helium, 40% hydrogen, 1.3% carbon, 2% nitrogen, and 1.3% oxygen, it differs greatly from the 30–50% of carbon which are typically seen in [WC]-type central stars. The atmospheric mixture in PB ...
... we find that its surface composition is hydrogen-deficient, but not carbon-rich. With mass fractions of 55% helium, 40% hydrogen, 1.3% carbon, 2% nitrogen, and 1.3% oxygen, it differs greatly from the 30–50% of carbon which are typically seen in [WC]-type central stars. The atmospheric mixture in PB ...
This document was created for people who do not have access to
... of our Milky Way galaxy. As we leave the Milky Way, we find ourselves in a universe filled with billions of galaxies. Because the light from distant galaxies takes vast amounts of time to reach our telescopes here on Earth, we see these galaxies as they looked in the past, when the universe was very ...
... of our Milky Way galaxy. As we leave the Milky Way, we find ourselves in a universe filled with billions of galaxies. Because the light from distant galaxies takes vast amounts of time to reach our telescopes here on Earth, we see these galaxies as they looked in the past, when the universe was very ...
Cluster formation in molecular clouds – I. Stellar populations, star
... from Klassen et al. (2012), who compared the effects of radiative feedback from stars with pre-stellar evolution and those without it. The authors found that there was not a significant difference between the two cases. Since the cluster will be actively accreting gas until feedback effects stop the ...
... from Klassen et al. (2012), who compared the effects of radiative feedback from stars with pre-stellar evolution and those without it. The authors found that there was not a significant difference between the two cases. Since the cluster will be actively accreting gas until feedback effects stop the ...
UMich w/s
... • Dark halos are `predicted’ down to sub-earth masses; but… • Neither the local disk, nor star clusters, nor spiral arms, nor GMC, nor the solar system, have associated DM: Given the absence of a very local enhancement, what is the smallest scale on which DM is concentrated? How can sub-halos in dSp ...
... • Dark halos are `predicted’ down to sub-earth masses; but… • Neither the local disk, nor star clusters, nor spiral arms, nor GMC, nor the solar system, have associated DM: Given the absence of a very local enhancement, what is the smallest scale on which DM is concentrated? How can sub-halos in dSp ...
Galaxies (Professor Powerpoint)
... Mergers can transform two spirals into an elliptical galaxy. Some astronomers think that galaxies are always born as spirals, and they can become ellipticals only via mergers. ...
... Mergers can transform two spirals into an elliptical galaxy. Some astronomers think that galaxies are always born as spirals, and they can become ellipticals only via mergers. ...
Star and Planet Formation Star and Planet - A
... 1. The planets revolve on elliptical orbits around the Sun, with the Sun in one focus. ...
... 1. The planets revolve on elliptical orbits around the Sun, with the Sun in one focus. ...
THE CELESTIAL SPHERE
... at its centre. We call this sphere the celestial sphere. At any point of time we can only see the upper half of the celestial sphere. The point on this dome right above our head is known as zenith. The lower boundary of this dome is the horizon. As the surface is 2-dimensional, to specify the positi ...
... at its centre. We call this sphere the celestial sphere. At any point of time we can only see the upper half of the celestial sphere. The point on this dome right above our head is known as zenith. The lower boundary of this dome is the horizon. As the surface is 2-dimensional, to specify the positi ...
CHAPTER 7—ATOMS AND STARLIGHT
... ____ 22. Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3200 K? a. There is no hydrogen in stars this cool. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the elec ...
... ____ 22. Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3200 K? a. There is no hydrogen in stars this cool. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the elec ...
Supernovae — Oct 18 10/18/2010
... After a supernova, what is left? • Outer layers expelled into space. New stars may form. • Core becomes either • a neutron star (Neutron stars in Crab pulses every 1/30 s.) • or a black hole. ...
... After a supernova, what is left? • Outer layers expelled into space. New stars may form. • Core becomes either • a neutron star (Neutron stars in Crab pulses every 1/30 s.) • or a black hole. ...
electron gas
... metals. It was expected that the free electrons, having 3 translational degrees of freedom, would contribute an additional (3/2)R to the specific heat (from equipartition theorem). This is obviously not in agreement with experiment. Our calculation shows that, indeed, the electronic contribution is ...
... metals. It was expected that the free electrons, having 3 translational degrees of freedom, would contribute an additional (3/2)R to the specific heat (from equipartition theorem). This is obviously not in agreement with experiment. Our calculation shows that, indeed, the electronic contribution is ...
The Milky Way
... Planet formation sites observed today as dust disks of T Tauri stars. Sun and our Solar system formed ~ 4.6 billion years ago. ...
... Planet formation sites observed today as dust disks of T Tauri stars. Sun and our Solar system formed ~ 4.6 billion years ago. ...
The California Planet Survey II. A Saturn
... stars, the relationships between the physical characteristics of stars and the properties of their planets will come into sharper focus. We are monitoring a sample of 147 late K and early M stars as part of the California Planet Survey at Keck Observatory with a current temporal baseline of ≈ 12 yea ...
... stars, the relationships between the physical characteristics of stars and the properties of their planets will come into sharper focus. We are monitoring a sample of 147 late K and early M stars as part of the California Planet Survey at Keck Observatory with a current temporal baseline of ≈ 12 yea ...
Black Holes - University of Oregon
... escaping from the surface. That energy loss means that the wavelength of the photon increases (towards the red – hence the term redshift) to longer wavelengths. Remember, the energy of a photon is inversely proportional to its wavelength; long wavelength photons have less energy than short waveleng ...
... escaping from the surface. That energy loss means that the wavelength of the photon increases (towards the red – hence the term redshift) to longer wavelengths. Remember, the energy of a photon is inversely proportional to its wavelength; long wavelength photons have less energy than short waveleng ...
Dust Formation in a Galaxy with Primitive Abundances REPORTS
... [Z/H] = −1.33 T 0.20 for the Sculptor Dwarf (26) and [Z/H] = 0.93 T 0.30 for Fornax [based on [Fe/H] = −1.0 T 0.3 (36) and assuming the same [a/Fe] as for the Sculptor Dwarf]. The weak trend of increasing acetylene absorption with decreasing metallicity is more readily apparent when the data are exa ...
... [Z/H] = −1.33 T 0.20 for the Sculptor Dwarf (26) and [Z/H] = 0.93 T 0.30 for Fornax [based on [Fe/H] = −1.0 T 0.3 (36) and assuming the same [a/Fe] as for the Sculptor Dwarf]. The weak trend of increasing acetylene absorption with decreasing metallicity is more readily apparent when the data are exa ...
young science communicator`s competition
... and it seems that Shapley was right, the galaxy is indeed much bigger than expected and in fact, the sun is not at the centre of the galaxy, we seem to live quite far from it. [There is a stunned silence] SHAPLEY: So it seems we were both right. CURTIS: And both wrong. [The crowd cheers and sound f ...
... and it seems that Shapley was right, the galaxy is indeed much bigger than expected and in fact, the sun is not at the centre of the galaxy, we seem to live quite far from it. [There is a stunned silence] SHAPLEY: So it seems we were both right. CURTIS: And both wrong. [The crowd cheers and sound f ...
3. Solar System Formation and Early Evolution
... Once the stars are formed, what remains of the parental cloud, not yet condensed into stars, is eventually dispersed, and the stars become optically visible. At this point, the stellar cluster becomes free from its parent cloud, and its evolution is regulated by dynamical effects in its own gravitati ...
... Once the stars are formed, what remains of the parental cloud, not yet condensed into stars, is eventually dispersed, and the stars become optically visible. At this point, the stellar cluster becomes free from its parent cloud, and its evolution is regulated by dynamical effects in its own gravitati ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.