Week 9 notes
... • Imagine a star with a relatively cool (4000k) atmosphere. Temperature is just a measure of the average velocity of the atoms and molecules in a gas. For a relatively cool gas there are: (1) Few atomic collisions with enough energy to knock electrons up to the 1st excited state so the majority of t ...
... • Imagine a star with a relatively cool (4000k) atmosphere. Temperature is just a measure of the average velocity of the atoms and molecules in a gas. For a relatively cool gas there are: (1) Few atomic collisions with enough energy to knock electrons up to the 1st excited state so the majority of t ...
Chapter 26
... its outward pressure is overcome by gravity. • Its core contracts and increases in temperature. • The outer layers expand and cool. • In this late stage of its life cycle, an average star like our Sun is called a giant. ...
... its outward pressure is overcome by gravity. • Its core contracts and increases in temperature. • The outer layers expand and cool. • In this late stage of its life cycle, an average star like our Sun is called a giant. ...
Ten Years Of XMM-Newton: Scientific Achievements And Future Prospects Norbert Schartel
... • Distance to globular clusters is well known ...
... • Distance to globular clusters is well known ...
Reprint
... to carbon, supernovae (12 C) and evolved stars (12 C and 13 C), including red giants, supergiants, and asymptotic giant branch (AGB) stars. Stellar yields from such objects result in an average galactic C/O ratio of 0.7 (Carigi et al. 2005). Hence, in most stars, C < O. The exceptions are AGB stars, ...
... to carbon, supernovae (12 C) and evolved stars (12 C and 13 C), including red giants, supergiants, and asymptotic giant branch (AGB) stars. Stellar yields from such objects result in an average galactic C/O ratio of 0.7 (Carigi et al. 2005). Hence, in most stars, C < O. The exceptions are AGB stars, ...
10) Physics and Chemistry of the Diffuse Interstellar Medium
... For completeness: the Intergalactic Medium ...
... For completeness: the Intergalactic Medium ...
SUMSS - 京都大学
... has probably had at least 10 interactions or mergers over its lifetime. Most galaxies are probably ‘assembled’ in this way rather than forming at a single epoch. ...
... has probably had at least 10 interactions or mergers over its lifetime. Most galaxies are probably ‘assembled’ in this way rather than forming at a single epoch. ...
The Milky Way
... • Random birth of Massive Stars • Their SN explosions compress nearby clouds & make new stars • Differential rotation of galaxy yields spiral appearance by streching the stars out • This best explains "rattier", broken-up spirals (like the Milky Way, though some Density Wave contribution is OK.) ...
... • Random birth of Massive Stars • Their SN explosions compress nearby clouds & make new stars • Differential rotation of galaxy yields spiral appearance by streching the stars out • This best explains "rattier", broken-up spirals (like the Milky Way, though some Density Wave contribution is OK.) ...
Gravitational Collapse with Negative Energy Field
... the strength of the C-field falls while for small a(t) a increases rapidly as per equation (10). This expansion therefore resembles an explosion. Further, the high local value of the C-field gradient will trigger off creation of Planck particles. ...
... the strength of the C-field falls while for small a(t) a increases rapidly as per equation (10). This expansion therefore resembles an explosion. Further, the high local value of the C-field gradient will trigger off creation of Planck particles. ...
Intro Astro PP
... • His systematic method was to name a star by using a letter or number followed by the Latin name of the constellation. ...
... • His systematic method was to name a star by using a letter or number followed by the Latin name of the constellation. ...
Heading for the Pole - MNASSA Page
... but definitely not without some effort. This unknown, yet well-known, point in the starry sky is only 10′ north of the relatively bright 8.7 magnitude HD 98784, which is the middle star of a short star-string. (Because the pole is rotating relatively fast, directions count for early evenings towards ...
... but definitely not without some effort. This unknown, yet well-known, point in the starry sky is only 10′ north of the relatively bright 8.7 magnitude HD 98784, which is the middle star of a short star-string. (Because the pole is rotating relatively fast, directions count for early evenings towards ...
SCE 18 – Part 10
... • This is the “Cosmic Microwave background (CMB) radiation. • Radiation ”left over” from the Big Bang, • The earliest radiation we can detect. ...
... • This is the “Cosmic Microwave background (CMB) radiation. • Radiation ”left over” from the Big Bang, • The earliest radiation we can detect. ...
PowerPoint
... Second-Earth Imager for TMT (SEIT) - the first instrument for direct detection of “1” Earth-mass planets. - A novel concept for high contrast imaging with ground-based telescopes - PFI has a general instrument for exoplanet and disk studies SEIT is complement with PFI (*NOT* competitive) 1.E-06 ...
... Second-Earth Imager for TMT (SEIT) - the first instrument for direct detection of “1” Earth-mass planets. - A novel concept for high contrast imaging with ground-based telescopes - PFI has a general instrument for exoplanet and disk studies SEIT is complement with PFI (*NOT* competitive) 1.E-06 ...
Test - Scioly.org
... supplies and put the test FACEDOWN. (Make sure, of course, to reorganize any unstapled tests – otherwise, we will have such a headache reorganizing the tests for grading.) I or another proctor will be going around to collect the tests. If I see anyone attempting to answer questions beyond the time l ...
... supplies and put the test FACEDOWN. (Make sure, of course, to reorganize any unstapled tests – otherwise, we will have such a headache reorganizing the tests for grading.) I or another proctor will be going around to collect the tests. If I see anyone attempting to answer questions beyond the time l ...
Presentazione di PowerPoint
... Maximum linear signal (physical or electronic saturation level); ...
... Maximum linear signal (physical or electronic saturation level); ...
1” “Sky-Notes” of the Open University Astronomy Club. September
... Although best placed in the predawn skies Mars is now presenting a large enough disc for useful observations and imaging to be made. The rotation of Mars is about half an hour slower than that of the Earth so that observations made at the same time on successive nights show only a small change in su ...
... Although best placed in the predawn skies Mars is now presenting a large enough disc for useful observations and imaging to be made. The rotation of Mars is about half an hour slower than that of the Earth so that observations made at the same time on successive nights show only a small change in su ...
Determining the Sizes & Distances of Stars Using the H
... sequence star. Their cores have filled with helium. There is not enough hydrogen left in the core so burning occurs in a shell surrounding the core, where more helium resides. In the process, the star grows in radius, becoming cooler but more luminous. ● Supergiants: Supergiants are the more massive ...
... sequence star. Their cores have filled with helium. There is not enough hydrogen left in the core so burning occurs in a shell surrounding the core, where more helium resides. In the process, the star grows in radius, becoming cooler but more luminous. ● Supergiants: Supergiants are the more massive ...
SpfFin - Academic Program Pages
... 4. What physical process generates a force inside a pre-main-sequence star to offset the force of gravity and stop the star from slowly condensing and shrinking, thus producing a stable, nonshrinking main-sequence star? Degeneracy pressure is generated by electrons when they are forced very close to ...
... 4. What physical process generates a force inside a pre-main-sequence star to offset the force of gravity and stop the star from slowly condensing and shrinking, thus producing a stable, nonshrinking main-sequence star? Degeneracy pressure is generated by electrons when they are forced very close to ...
this PDF file - University of Leicester Open Journals
... night sky. In 1844, the astronomer Friedrich Bessel was making very precise measurements of stars. By this time, it was known that the stars are not fixed points in a giant celestial sphere as was imagined by Aristotle. Instead, stars travel through space, although this movement is very difficult to ...
... night sky. In 1844, the astronomer Friedrich Bessel was making very precise measurements of stars. By this time, it was known that the stars are not fixed points in a giant celestial sphere as was imagined by Aristotle. Instead, stars travel through space, although this movement is very difficult to ...
Blackbody radiation Temperature of stars
... Sun: RT = 5.9ּ107 W/m2; North Star: RT = 2.71ּ108 W/m2 ...
... Sun: RT = 5.9ּ107 W/m2; North Star: RT = 2.71ּ108 W/m2 ...
Earth in the Universe Answer each in your binder or notebook. Date
... A. The galaxy’s stellar nebulae reflect the Sun’s light. B. Billions of stars in the galaxy carry out nuclear fusion. C. Tons of compressed matter begin to radiate visible light from the galaxy center. D. The galaxy spins at a speed that generates a large amount of molecular friction. ...
... A. The galaxy’s stellar nebulae reflect the Sun’s light. B. Billions of stars in the galaxy carry out nuclear fusion. C. Tons of compressed matter begin to radiate visible light from the galaxy center. D. The galaxy spins at a speed that generates a large amount of molecular friction. ...
Lokal fulltext - Chalmers Publication Library
... This thesis probes these topics at different stages. First, observations of CO lines in the supernova remnant Cassiopeia A have been used to study the effect of the reverse shock on supernova ejecta (Paper I). We find a large column density of warm CO, which has most likely re-formed after the passa ...
... This thesis probes these topics at different stages. First, observations of CO lines in the supernova remnant Cassiopeia A have been used to study the effect of the reverse shock on supernova ejecta (Paper I). We find a large column density of warm CO, which has most likely re-formed after the passa ...
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.