The Basics of the Universe
... them to have very strong magnetic fields, and the ones with the strongest are called magnetars. Pulsars have two light beams (not harmful at a distance) that emit out of their polar regions, and if these are facing Earth, then the star appears to blink very quickly, hundreds to thousands of times pe ...
... them to have very strong magnetic fields, and the ones with the strongest are called magnetars. Pulsars have two light beams (not harmful at a distance) that emit out of their polar regions, and if these are facing Earth, then the star appears to blink very quickly, hundreds to thousands of times pe ...
Similarities Between Electric and Gravitational Forces • Coulomb’s force: q F
... • All nearby stars ...
... • All nearby stars ...
Omega Centauri
... parameter problem (which have been there for decades), as well as the newly discovered multiple sequences in the CMD. 3) Finally, we should never forget that what we will learn on the origin and on the properties of multiple populations in star clusters has a deep impact on our understanding of the ...
... parameter problem (which have been there for decades), as well as the newly discovered multiple sequences in the CMD. 3) Finally, we should never forget that what we will learn on the origin and on the properties of multiple populations in star clusters has a deep impact on our understanding of the ...
Micro_lect20a
... • Nothing remains but degenerate core of Oxygen and Carbon • “White dwarf” cools but does not contract because core is degenerate • No energy from fusion, no energy from gravitational contraction • White dwarf slowly fades away… ...
... • Nothing remains but degenerate core of Oxygen and Carbon • “White dwarf” cools but does not contract because core is degenerate • No energy from fusion, no energy from gravitational contraction • White dwarf slowly fades away… ...
Opakování z minulého cvičení
... An intermediate ring of comets and other cosmic debris, called the Kuiper Belt, lies beyond the orbits Pluto and Neptune, between about 35 and 1,000 astronomical units from the Sun. It contains perhaps 100 milion comets, some of which may have fed into the belt from the Oort cloud. Whatever their or ...
... An intermediate ring of comets and other cosmic debris, called the Kuiper Belt, lies beyond the orbits Pluto and Neptune, between about 35 and 1,000 astronomical units from the Sun. It contains perhaps 100 milion comets, some of which may have fed into the belt from the Oort cloud. Whatever their or ...
Slide 1
... Turn Off - As the hydrogen fuel in a star's core runs out the core begins to collapse due to gravity and the star moves away from the main sequence. At the turn off nearly all the central fuel is gone. Red Giant Branch - When the central fuel is gone, hydrogen starts to burn in an envelope around a ...
... Turn Off - As the hydrogen fuel in a star's core runs out the core begins to collapse due to gravity and the star moves away from the main sequence. At the turn off nearly all the central fuel is gone. Red Giant Branch - When the central fuel is gone, hydrogen starts to burn in an envelope around a ...
CP2: KUPKA et al.: Observational signatures of atmospheric velocity
... (iota Her is one of the sharpest-line normal B stars known) is enough to mask the signature of the atmospheric convective velocity field, and the same small v sin i prevents the beta Cep oscillations from appearing in the profiles. Fit to spectrum of HD 160762 = iota Her, a normal B3 IV star. Our mo ...
... (iota Her is one of the sharpest-line normal B stars known) is enough to mask the signature of the atmospheric convective velocity field, and the same small v sin i prevents the beta Cep oscillations from appearing in the profiles. Fit to spectrum of HD 160762 = iota Her, a normal B3 IV star. Our mo ...
AMNH_colloquium_2May07_v7b
... O star X-ray emission line profiles are broadened, shifted, and asymmetric as the wind-shock scenario predicts But the degree of asymmetry requires significantly lower wind optical depths than are expected in these stars Clumping and the associated porosity can, in principle, alleviate this problem, ...
... O star X-ray emission line profiles are broadened, shifted, and asymmetric as the wind-shock scenario predicts But the degree of asymmetry requires significantly lower wind optical depths than are expected in these stars Clumping and the associated porosity can, in principle, alleviate this problem, ...
GRA VIT A TIONAL
... In the accretion phase, the in ow speed is accelerated at least to (4 0 5) 2 cs and as a result magnetic eld lines are strongly dragged and squeezed to the center (see Fig. 1c of Tomisaka 1996b). Beside these, the rotation speed is accelerated as the infall proceeds. Just after the state shown in F ...
... In the accretion phase, the in ow speed is accelerated at least to (4 0 5) 2 cs and as a result magnetic eld lines are strongly dragged and squeezed to the center (see Fig. 1c of Tomisaka 1996b). Beside these, the rotation speed is accelerated as the infall proceeds. Just after the state shown in F ...
Notes on White Dwarfs and Neutron Stars.
... We saw that the pressure of degenerate electrons has two limiting cases, both of the form P ∝ ργ , where in the non-relativistic limit γ = 5/3 , while in the highly relativistic limit γ = 4/3 . These are examples of the polytropic equation of state, where the polytropic index n is related to γ by γ ...
... We saw that the pressure of degenerate electrons has two limiting cases, both of the form P ∝ ργ , where in the non-relativistic limit γ = 5/3 , while in the highly relativistic limit γ = 4/3 . These are examples of the polytropic equation of state, where the polytropic index n is related to γ by γ ...
Dust in Space - Max-Planck
... The further away a galaxy is, however, the more difficult verification becomes. It was thus hailed as a great breakthrough when, a few years ago, scientists succeeded in measuring the thermal emission of dust in the most distant known quasars. The latter are the ultrabright central regions of galaxi ...
... The further away a galaxy is, however, the more difficult verification becomes. It was thus hailed as a great breakthrough when, a few years ago, scientists succeeded in measuring the thermal emission of dust in the most distant known quasars. The latter are the ultrabright central regions of galaxi ...
Chapter 13 The Stellar Graveyard
... Scientists have identified the most magnetic object known in the universe, the result of the first direct measurement of a magnetic field around a peculiar neutron star first observed nearly 25 years ago. By following the fate of a tiny proton whipping about at near light speed close to the neutron ...
... Scientists have identified the most magnetic object known in the universe, the result of the first direct measurement of a magnetic field around a peculiar neutron star first observed nearly 25 years ago. By following the fate of a tiny proton whipping about at near light speed close to the neutron ...
Laboratory Studies of Organic Chemistry in Space A. Ciaravella
... ● mostly gas and dust existing over a wide range of physical conditions ...
... ● mostly gas and dust existing over a wide range of physical conditions ...
Final Exam - Practice questions for Unit V
... ______ 17. How have winds been detected in exoplanetary atmospheres? a. Imaging that allows the tracking of cloud features on the disks of exoplanets. b. The broadening of spectral lines due to the Doppler shifts from the winds. c. Infrared emission as a hot Jupiter orbits its star showing that the ...
... ______ 17. How have winds been detected in exoplanetary atmospheres? a. Imaging that allows the tracking of cloud features on the disks of exoplanets. b. The broadening of spectral lines due to the Doppler shifts from the winds. c. Infrared emission as a hot Jupiter orbits its star showing that the ...
Molecular gas in the host galaxy of a quasar at redshift z 5 6.42
... formation, the implied star formation rate is 3,000 M ( per year (ref. 9). Comparing this to the molecular gas mass implies a short gas depletion timescale of the order of 107 years. However, given the high luminosity of the quasar it is possible that some fraction of the dust is heated by the quasa ...
... formation, the implied star formation rate is 3,000 M ( per year (ref. 9). Comparing this to the molecular gas mass implies a short gas depletion timescale of the order of 107 years. However, given the high luminosity of the quasar it is possible that some fraction of the dust is heated by the quasa ...
Stellar Luminosities
... • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring out how they produce ...
... • When we learn how to get distances beyond the limits of parallax and sample many more stars, we will find there are stars that are stars that are 106 times the luminosity of the Sun. • This is an enormous range in energy output from stars. This is an important clue in figuring out how they produce ...
ASTRONOMY 5
... shine in a different way by ejecting blobs of ionized, fast-moving gas mixed with magnetic fields. The electrons in the gas spiral around in the magnetic field, which causes them to emit bright synchrotron radio emission (and sometimes visible light). These appear as “jets” and “lobes” in radio imag ...
... shine in a different way by ejecting blobs of ionized, fast-moving gas mixed with magnetic fields. The electrons in the gas spiral around in the magnetic field, which causes them to emit bright synchrotron radio emission (and sometimes visible light). These appear as “jets” and “lobes” in radio imag ...
SCIN 293-PL-New Course
... Topic Mastery: Describe the steps in the life of a 1 solar mass stars and contrast them with the steps in the life of a 10 solar mass star. Also focus on the differences in the fusion processes of low vs. high mass stars. ...
... Topic Mastery: Describe the steps in the life of a 1 solar mass stars and contrast them with the steps in the life of a 10 solar mass star. Also focus on the differences in the fusion processes of low vs. high mass stars. ...
03 September: Distances to Stars, Light Years and Parsecs
... First point: parallaxes are small (noted by Aristotle). Need a smaller angular unit than degrees • 1 degree = 1/90 of a right angle • 1 arcminute (‘) is 1/60 of a degree • 1 arcsecond (“) is 1/60 of an arcminute 1 arcsecond is the angle subtended by a penny at a distance of 4.1 km (2.5 miles) ...
... First point: parallaxes are small (noted by Aristotle). Need a smaller angular unit than degrees • 1 degree = 1/90 of a right angle • 1 arcminute (‘) is 1/60 of a degree • 1 arcsecond (“) is 1/60 of an arcminute 1 arcsecond is the angle subtended by a penny at a distance of 4.1 km (2.5 miles) ...
Lecture notes -
... A new unit of distance: the parsec A parsec is the distance of a star whose parallax is 1 arcsecond. A star with a parallax of 1/2 arcsecond is at a distance of 2 parsecs. ...
... A new unit of distance: the parsec A parsec is the distance of a star whose parallax is 1 arcsecond. A star with a parallax of 1/2 arcsecond is at a distance of 2 parsecs. ...
Although a wall looks real, solid to sight and feel, a wall is not a wall
... Throughout most of the life of the star, the nuclear fires in its interior burn steadily, consuming hydrogen and leaving behind a residue of heavier elements. These heavier elements are the ashes of the star’s fire. Oxygen, iron, copper, and many other elements, ranging up to gold, lead, and uranium ...
... Throughout most of the life of the star, the nuclear fires in its interior burn steadily, consuming hydrogen and leaving behind a residue of heavier elements. These heavier elements are the ashes of the star’s fire. Oxygen, iron, copper, and many other elements, ranging up to gold, lead, and uranium ...
The Solar Neighborhood
... Part 2: The Nearest and Brightest Stars Plot the stars from the two lists of brightest and nearest stars on the Hertzsprung-Russell diagram on the next page. Use the intrinsic brightness (absolute magnitude) on the y-axis and the temperature on the x-axis. Note that the y-axis has negative magnitud ...
... Part 2: The Nearest and Brightest Stars Plot the stars from the two lists of brightest and nearest stars on the Hertzsprung-Russell diagram on the next page. Use the intrinsic brightness (absolute magnitude) on the y-axis and the temperature on the x-axis. Note that the y-axis has negative magnitud ...
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.