1/2016
... Description: Delta Cephei is the prototype of the Cepheid class of variable stars. With a change in visual magnitude of 3.5 to 4.4, delta Cephei’s entire range of variability can be observed with the unaided eye. Its period of 5.366 days makes it an attractive candidate for anyone anxious to obtain ...
... Description: Delta Cephei is the prototype of the Cepheid class of variable stars. With a change in visual magnitude of 3.5 to 4.4, delta Cephei’s entire range of variability can be observed with the unaided eye. Its period of 5.366 days makes it an attractive candidate for anyone anxious to obtain ...
VV Cephei Eclipse Campaign 2017/19
... The binary star system VV Cephei is a cool red supergiant star (M2 Iab) with a smaller hot blue companion star (B02V). The primary star of VV Cephei is a massive red supergiant star, with an estimated mass of about 20 solar masses. The two stars in this binary are well-separated and significant mass ...
... The binary star system VV Cephei is a cool red supergiant star (M2 Iab) with a smaller hot blue companion star (B02V). The primary star of VV Cephei is a massive red supergiant star, with an estimated mass of about 20 solar masses. The two stars in this binary are well-separated and significant mass ...
mufon ufo symposium -1974
... little, as there is so much total radiating surface besides the flare. On a small star, the same size flare may give off many times the star’s usual energy, destroying any life that might be on a nearby planet. To summarize, the best chance for life is F8, all Gs, through KO, especially where the KO ...
... little, as there is so much total radiating surface besides the flare. On a small star, the same size flare may give off many times the star’s usual energy, destroying any life that might be on a nearby planet. To summarize, the best chance for life is F8, all Gs, through KO, especially where the KO ...
exploring the solar system, the galaxies, and the
... On the NEW VIEWS OF THE UNIVERSE page, select Stars. Watch the video “A star’s Life”. Click and read “About Stars”, “Star Birth”, and Star Death”. 12. What materials form stars? __________________________ ________________________________. 13. What powers stars? ______________________________. 14. Ho ...
... On the NEW VIEWS OF THE UNIVERSE page, select Stars. Watch the video “A star’s Life”. Click and read “About Stars”, “Star Birth”, and Star Death”. 12. What materials form stars? __________________________ ________________________________. 13. What powers stars? ______________________________. 14. Ho ...
Star formation in a galactic outflow
... the ratio between ionizing photon flux and gas density; when divided by the speed of light it is the adimensional ionization parameter U) much lower than typically observed in star-forming galaxies. Yet, despite the gas density in the outflow (~600-1,500 cm-3, as inferred from the [SII] doublet) bei ...
... the ratio between ionizing photon flux and gas density; when divided by the speed of light it is the adimensional ionization parameter U) much lower than typically observed in star-forming galaxies. Yet, despite the gas density in the outflow (~600-1,500 cm-3, as inferred from the [SII] doublet) bei ...
THE CHANGING SKY
... constellations you can see at night depends greatly on both the time, date, and location from which you do your observations. In this lab, we will try to understand why the sky is different at different times. II. Exercises: Rotation of the Earth During the course of a night or a year, the stars app ...
... constellations you can see at night depends greatly on both the time, date, and location from which you do your observations. In this lab, we will try to understand why the sky is different at different times. II. Exercises: Rotation of the Earth During the course of a night or a year, the stars app ...
X-ray Astronomy and the search for Black Holes
... • Swift XRT has problems with CH Cyg because it is extremely bright in the optical • The other three can be fitted with a bremsstrahlung continuum plus a single Gaussian near 6.5 keV, with a strong partial covering absorber. – Note BAT spectrum is average over 9 months, XRT data are from relatively ...
... • Swift XRT has problems with CH Cyg because it is extremely bright in the optical • The other three can be fitted with a bremsstrahlung continuum plus a single Gaussian near 6.5 keV, with a strong partial covering absorber. – Note BAT spectrum is average over 9 months, XRT data are from relatively ...
Lecture 2. Isolated Neutron Stars – I.
... Accretion in close binaries Accretion is the most powerful source of energy realized in Nature, which can give a huge energy output. When matter fall down onto the surface of a neutron star up to 10% of mc2 can be released. ...
... Accretion in close binaries Accretion is the most powerful source of energy realized in Nature, which can give a huge energy output. When matter fall down onto the surface of a neutron star up to 10% of mc2 can be released. ...
Today in Astronomy 102: observations of stellar
... X-ray or -ray emission. High-energy light should be emitted by material falling into black holes; this, in fact, should be one of the principal signatures of a black hole because it is hard for ordinary astronomical objects to emit X rays. Search for such objects near visible stars. Most stars ha ...
... X-ray or -ray emission. High-energy light should be emitted by material falling into black holes; this, in fact, should be one of the principal signatures of a black hole because it is hard for ordinary astronomical objects to emit X rays. Search for such objects near visible stars. Most stars ha ...
Lecture 7
... Light is absorbed only at wavelengths corresponding to energy differences between permitted electron orbits. Result: an absorption p line spectrum. p ...
... Light is absorbed only at wavelengths corresponding to energy differences between permitted electron orbits. Result: an absorption p line spectrum. p ...
What kind of stuff
... • Bars are found in ¾ of spirals and are thought to arise from instabilities • It is unclear exactly why not all spiral galaxies are barred… ...
... • Bars are found in ¾ of spirals and are thought to arise from instabilities • It is unclear exactly why not all spiral galaxies are barred… ...
Lecture2 - UCSB Physics
... • Bars are found in ¾ of spirals and are thought to arise from instabilities • It is unclear exactly why not all spiral galaxies are barred… ...
... • Bars are found in ¾ of spirals and are thought to arise from instabilities • It is unclear exactly why not all spiral galaxies are barred… ...
MS Word version
... predictions about the locations and motions of the stars as time advances. After drawing in your predictions you should use the simulator to check your answer. If your original prediction was in error, redraw your star paths to reflect the correct motion. a) Draw in the location of the North Celesti ...
... predictions about the locations and motions of the stars as time advances. After drawing in your predictions you should use the simulator to check your answer. If your original prediction was in error, redraw your star paths to reflect the correct motion. a) Draw in the location of the North Celesti ...
Solutions to Homework #6, AST 203, Spring 2012
... Surely this is science fiction! Well, yes, “The Hitchhiker’s Guide to the Galaxy” is indeed science fiction, but do such incredibly massive black holes actually exist? Indeed they do: the cores of massive galaxies (including our own Milky Way) do contain such enormous black holes. Indeed, the most m ...
... Surely this is science fiction! Well, yes, “The Hitchhiker’s Guide to the Galaxy” is indeed science fiction, but do such incredibly massive black holes actually exist? Indeed they do: the cores of massive galaxies (including our own Milky Way) do contain such enormous black holes. Indeed, the most m ...
THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC
... allow an exploration of the interplay between ongoing star formation and the multi-phase interstellar medium (ISM). Further, nearby gas-rich systems are amenable to detailed studies of galactic rotational dynamics in the absence of differential shear. Many dwarfs display solidbody rotation that is w ...
... allow an exploration of the interplay between ongoing star formation and the multi-phase interstellar medium (ISM). Further, nearby gas-rich systems are amenable to detailed studies of galactic rotational dynamics in the absence of differential shear. Many dwarfs display solidbody rotation that is w ...
Elliptical Galaxies
... M-82 Galaxy M-82 is also known as the "Cigar Galaxy". It is not exactly edge-on, but it is very close. The galaxy is rich in star birth activities and shows a nice dark dusk region. The galaxy is located near the Big dipper and can only be seen from the northern ...
... M-82 Galaxy M-82 is also known as the "Cigar Galaxy". It is not exactly edge-on, but it is very close. The galaxy is rich in star birth activities and shows a nice dark dusk region. The galaxy is located near the Big dipper and can only be seen from the northern ...
Astrophysics in a Nutshell, Second Edition
... the abundances. Indeed, at some point, the hydrogen fuel in the core will be largely used up, and the star will lose the energy source that produces pressure, the gradient of which supports the star against gravitational collapse. It is therefore unavoidable that stars evolve with time. In this chap ...
... the abundances. Indeed, at some point, the hydrogen fuel in the core will be largely used up, and the star will lose the energy source that produces pressure, the gradient of which supports the star against gravitational collapse. It is therefore unavoidable that stars evolve with time. In this chap ...
present
... Andromeda. Cassiopeia would always say she was prettier than the sea nymphs. A monster called Cetus was sent to punish her. It was about to eat Andromeda, when Perseus saved her. All five are now constellations. ...
... Andromeda. Cassiopeia would always say she was prettier than the sea nymphs. A monster called Cetus was sent to punish her. It was about to eat Andromeda, when Perseus saved her. All five are now constellations. ...
1 Cosmology: a brief refresher course
... is kT ' 80 keV, heavier nuclei start to form in abundance. This occurs roughly three minutes after t = 0. • The ratio of neutrons to protons at this point is around 1/7. It is smaller than the value at freeze-out because some of the neutrons have undergone beta decay. • Almost all of these neutrons ...
... is kT ' 80 keV, heavier nuclei start to form in abundance. This occurs roughly three minutes after t = 0. • The ratio of neutrons to protons at this point is around 1/7. It is smaller than the value at freeze-out because some of the neutrons have undergone beta decay. • Almost all of these neutrons ...
Geoscience
... New Earth is formed near what feature? For those of you who like to split hairs, the age of the atoms are the same. We speak of the time when the molten material hardened into stone. a. Subduction zone c. Lithosphere b. Mid-ocean ridge d. Epicenters Plates tend to move about the Earth. Why do they ...
... New Earth is formed near what feature? For those of you who like to split hairs, the age of the atoms are the same. We speak of the time when the molten material hardened into stone. a. Subduction zone c. Lithosphere b. Mid-ocean ridge d. Epicenters Plates tend to move about the Earth. Why do they ...
Astrophysics
... describe the properties of stars: luminosity, radius and mass, temperature and spectral type; use the Hertzsprung-Russell diagram to describe types of stars, their evolution and death; explain fusion as the energy source of a star; compare the Milky Way galaxy to other galaxies; describe characteris ...
... describe the properties of stars: luminosity, radius and mass, temperature and spectral type; use the Hertzsprung-Russell diagram to describe types of stars, their evolution and death; explain fusion as the energy source of a star; compare the Milky Way galaxy to other galaxies; describe characteris ...
The larger the magnetic field, the stronger our ignorance
... Stars form when already-dense clumps of interstellar gas collapse further. They don’t find it easy. The overall rotation of our galaxy means that any region containing one solar mass of gas has far too much angular momentum to become a one solar mass star rotating at less than break-up speed. Magnet ...
... Stars form when already-dense clumps of interstellar gas collapse further. They don’t find it easy. The overall rotation of our galaxy means that any region containing one solar mass of gas has far too much angular momentum to become a one solar mass star rotating at less than break-up speed. Magnet ...
Folie 1
... one of the defining candidates of T-Tauri stars present on all time scales short time, mostly small changes: rotation ocultations from disk ‘flickering’ long time, larger amplitudes: EX Lup (EXor) FU Ori (FUor) duration for FUor unclear, frequency 5-50kyr from infrared ...
... one of the defining candidates of T-Tauri stars present on all time scales short time, mostly small changes: rotation ocultations from disk ‘flickering’ long time, larger amplitudes: EX Lup (EXor) FU Ori (FUor) duration for FUor unclear, frequency 5-50kyr from infrared ...
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.