A Planetary Overview
... from the heat generated by the natural decay of plutonium. The spacecraft have enough power to operate at least until 2020. ...
... from the heat generated by the natural decay of plutonium. The spacecraft have enough power to operate at least until 2020. ...
CH15.AST1001.F16.EDS
... remnant cools and begins to emit visible light as it expands. New elements made by supernova mix into interstellar medium. © 2015 Pearson Education, Inc. ...
... remnant cools and begins to emit visible light as it expands. New elements made by supernova mix into interstellar medium. © 2015 Pearson Education, Inc. ...
The High Resolution Camera CXC Newsletter
... a nearby star with a dusty disk. On the main sequence, there are two different mechanisms that generate stellar X-ray emission. Massive O and B stars have radiatively driven winds, and because these winds are unstable, X-ray emitting shocks form. On the other end to the main sequence are the cool st ...
... a nearby star with a dusty disk. On the main sequence, there are two different mechanisms that generate stellar X-ray emission. Massive O and B stars have radiatively driven winds, and because these winds are unstable, X-ray emitting shocks form. On the other end to the main sequence are the cool st ...
Is there life in space? Activity 1: The Vastness of Space
... A. The signal is more evident when the tilt is lower. The telescopes are not perfect, so they can only detect star motions that are very large. The largest motions occur when the tilt is closer to 0 degrees. Q. Why might a scientist, using modern telescopes, be unsure about having discovered a plane ...
... A. The signal is more evident when the tilt is lower. The telescopes are not perfect, so they can only detect star motions that are very large. The largest motions occur when the tilt is closer to 0 degrees. Q. Why might a scientist, using modern telescopes, be unsure about having discovered a plane ...
Gamma Ray Burst Afterglows and Host Galaxies
... Gamma Ray Bursts and the Deaths of Massive Stars Afterglow data suggests that GRBs occur… • in galaxies with active star formation, • often in regions with a lot of gas, which is where new stars form and where the most massive stars spend their entire brief lives. However, GRBs are so rare that onl ...
... Gamma Ray Bursts and the Deaths of Massive Stars Afterglow data suggests that GRBs occur… • in galaxies with active star formation, • often in regions with a lot of gas, which is where new stars form and where the most massive stars spend their entire brief lives. However, GRBs are so rare that onl ...
lecture course
... Elliptical galaxies come in two types - giant ellipticals, which have high brightnesses at their centres and absolute B magnitudes between about -25 and -15, and dwarf ellipticals, which have low brightnesses at their centres and absolute B magnitudes fainter than about -18. The faintest galaxies kn ...
... Elliptical galaxies come in two types - giant ellipticals, which have high brightnesses at their centres and absolute B magnitudes between about -25 and -15, and dwarf ellipticals, which have low brightnesses at their centres and absolute B magnitudes fainter than about -18. The faintest galaxies kn ...
The cosmic origin of fluorine and sulphur
... small white dwarf in the middle of the picture, and around it the elements the giant star has produced and expelled into its surroundings are clearly visible. In practice my result means that all the fluorine we come in contact with, including that in our toothpaste, likely has been formed like this ...
... small white dwarf in the middle of the picture, and around it the elements the giant star has produced and expelled into its surroundings are clearly visible. In practice my result means that all the fluorine we come in contact with, including that in our toothpaste, likely has been formed like this ...
Prospects for Viewing Comet ISON
... It is a sungrazing comet, and appears to be a first timer. While there's no official definition for a sungrazing comet, ISON will pass only 0.0124 Astronomical Units (AU) from the sun's center. That's a bit more than 700,000 miles above the sun's photosphere. From the earth's point of view the comet ...
... It is a sungrazing comet, and appears to be a first timer. While there's no official definition for a sungrazing comet, ISON will pass only 0.0124 Astronomical Units (AU) from the sun's center. That's a bit more than 700,000 miles above the sun's photosphere. From the earth's point of view the comet ...
Galaxy Structure
... entire Galactic plane and specific nearby clouds to produce a panorama of the entire Milky Way in molecular gas at an angular resolution of Jº. Their compilation exhibits a sky coverage and resolution which are comparable with those of early 21 cm surveys. A comparison with other population I tracer ...
... entire Galactic plane and specific nearby clouds to produce a panorama of the entire Milky Way in molecular gas at an angular resolution of Jº. Their compilation exhibits a sky coverage and resolution which are comparable with those of early 21 cm surveys. A comparison with other population I tracer ...
Stellar radii from long-baseline interferometry
... 4. 61 Cyg A & B: a low-mass nearby binary system The cool dwarfs 61 Cyg A and B are the nearest stars in the northern hemisphere. They are a visual binary pair with a very long orbital period (≈ 700 yrs). In 1838, 61 Cyg became the first star whose distance from Earth was estimated accurately (Bessel ...
... 4. 61 Cyg A & B: a low-mass nearby binary system The cool dwarfs 61 Cyg A and B are the nearest stars in the northern hemisphere. They are a visual binary pair with a very long orbital period (≈ 700 yrs). In 1838, 61 Cyg became the first star whose distance from Earth was estimated accurately (Bessel ...
KIC 10449976: discovery of an extreme helium
... Best-fitting atmospheric parameters for KIC 10449976 were established by interpolation in a grid of synthetic spectra computed from a grid of line-blanketed model atmospheres computed in local thermodynamic, hydrostatic and radiative equilibrium. The grid covers a wide range in effective temperature ...
... Best-fitting atmospheric parameters for KIC 10449976 were established by interpolation in a grid of synthetic spectra computed from a grid of line-blanketed model atmospheres computed in local thermodynamic, hydrostatic and radiative equilibrium. The grid covers a wide range in effective temperature ...
The new Basel high-latitude field star survey of the Galaxy
... of the Galactic population components that were derived from the previous studies of seven fields mainly in the outer Galaxy (Buser et al. 1998, 1999, hereafter Papers I and II, respectively). Apart from the canonical structural parameters, we here explore some of the special conditions prevailing i ...
... of the Galactic population components that were derived from the previous studies of seven fields mainly in the outer Galaxy (Buser et al. 1998, 1999, hereafter Papers I and II, respectively). Apart from the canonical structural parameters, we here explore some of the special conditions prevailing i ...
Local Group Encyclopedia of Astronomy & Astrophysics eaa.iop.org Mario L Mateo
... unsustainably rapid rate. If it were to continue it would soon exhaust its raw materials for making stars (gas and ...
... unsustainably rapid rate. If it were to continue it would soon exhaust its raw materials for making stars (gas and ...
The Milky Way Galaxy
... orbiting a nucleus made up of only a proton Both the proton and the electron have Spin which can be considered as an inherent angular momentum The spins of the proton and electron can be aligned in one of two ways ...
... orbiting a nucleus made up of only a proton Both the proton and the electron have Spin which can be considered as an inherent angular momentum The spins of the proton and electron can be aligned in one of two ways ...
Tasks - ESA Science
... Observatories in Chile have presented ever deeper and more spectacular views of the Universe. However, Hubble and the ESO telescopes have not just provided stunning new images, they are also invaluable tools for astronomers. The telescopes have excellent spatial/angular resolution (image sharpness) ...
... Observatories in Chile have presented ever deeper and more spectacular views of the Universe. However, Hubble and the ESO telescopes have not just provided stunning new images, they are also invaluable tools for astronomers. The telescopes have excellent spatial/angular resolution (image sharpness) ...
Neon and oxygen in low activity stars: towards a coronal unification
... Our stellar sample consists of those stars from the XMM-Newton monitoring program on coronal activity cycles, i.e. 61 Cyg (K5+K7) (Hempelmann et al. 2006), α Cen (G2+K1) (Robrade et al. 2005, 2007) and HD 81809 (G2+G9) (Favata et al. 2004), as well as the stars β Com (G0), Eri (K2) and Procyon (F5 ...
... Our stellar sample consists of those stars from the XMM-Newton monitoring program on coronal activity cycles, i.e. 61 Cyg (K5+K7) (Hempelmann et al. 2006), α Cen (G2+K1) (Robrade et al. 2005, 2007) and HD 81809 (G2+G9) (Favata et al. 2004), as well as the stars β Com (G0), Eri (K2) and Procyon (F5 ...
EVERYTHING YOU EVER WANTED TO KNOW ABOUT GAIA!
... Based on the current design, Gaia will be 3 metres high, about 10 metres across, and will weigh around 2000 kg. How big is our Galaxy? If we could travel at the speed of light, it would take around 100000 years to reach the other end of our Galaxy. How far is the closest star to us? The closest star ...
... Based on the current design, Gaia will be 3 metres high, about 10 metres across, and will weigh around 2000 kg. How big is our Galaxy? If we could travel at the speed of light, it would take around 100000 years to reach the other end of our Galaxy. How far is the closest star to us? The closest star ...
Chapter 10
... 2. Discuss the apparent and absolute magnitudes of a star. How can knowing both of them give us a star’s distance? 3. Why are the hydrogen lines not as strong in type “O” stars and type “K” stars as they are in type “A” stars? 4. Discuss the spectral classification of stellar temperatures. 5. How do ...
... 2. Discuss the apparent and absolute magnitudes of a star. How can knowing both of them give us a star’s distance? 3. Why are the hydrogen lines not as strong in type “O” stars and type “K” stars as they are in type “A” stars? 4. Discuss the spectral classification of stellar temperatures. 5. How do ...
Starlight Natal Report
... On the day you were born, you not only gained the magic of your horoscope, you also gained the myths and meanings of a sky full of stars. Not all the stars, just those that formed links to your natal planets via what is called parans. By considering the star parans in your life you will be encounter ...
... On the day you were born, you not only gained the magic of your horoscope, you also gained the myths and meanings of a sky full of stars. Not all the stars, just those that formed links to your natal planets via what is called parans. By considering the star parans in your life you will be encounter ...
NAS biographical memoir of Martin Schwarzschild
... the progress of a typical star after it contracts out of the interstellar medium and begins to burn its nuclear fuel through a sequence of phases: main sequence (like the sun) to red giant (like our neighbor Arcturus) to degenerate dwarf (like another neighbor, Sirius B). By now there have been innu ...
... the progress of a typical star after it contracts out of the interstellar medium and begins to burn its nuclear fuel through a sequence of phases: main sequence (like the sun) to red giant (like our neighbor Arcturus) to degenerate dwarf (like another neighbor, Sirius B). By now there have been innu ...
The Galactic evolution of phosphorus
... log (EW/λ) ≤ −5.5, and a Gaussian profile is a good approximation for the line profile fitting. The P i line at 1051 nm is, for several stars, contaminated by telluric absorption (see upperleft panel of Fig. 1). When possible, we measured the EW of the P i line taking into account the presence of th ...
... log (EW/λ) ≤ −5.5, and a Gaussian profile is a good approximation for the line profile fitting. The P i line at 1051 nm is, for several stars, contaminated by telluric absorption (see upperleft panel of Fig. 1). When possible, we measured the EW of the P i line taking into account the presence of th ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.