Composition and Mass Loss
... expansion leads to lowering of density until the material becomes some optically thin it cannot detected ...
... expansion leads to lowering of density until the material becomes some optically thin it cannot detected ...
Today`s Powerpoint
... don't interact with ordinary matter at all (except gravity). Some may be brown dwarfs, dead white dwarfs … Most likely it's a dark halo surrounding the Milky Way. ...
... don't interact with ordinary matter at all (except gravity). Some may be brown dwarfs, dead white dwarfs … Most likely it's a dark halo surrounding the Milky Way. ...
Origin of the Earth and of the Solar System
... reaction is dominant: four hydrogen nuclei (protons) ultimately yield a Helium nucleus. Only when the central temperature further increase, Helium nuclei can be fused to Carbon. In Red Supergiants, fusion processes in concentric shells produce heavy elements – but only up to Iron. ...
... reaction is dominant: four hydrogen nuclei (protons) ultimately yield a Helium nucleus. Only when the central temperature further increase, Helium nuclei can be fused to Carbon. In Red Supergiants, fusion processes in concentric shells produce heavy elements – but only up to Iron. ...
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... Share and discuss your results with the rest of the class. Determine if your team’s answers are reasonable. ...
... Share and discuss your results with the rest of the class. Determine if your team’s answers are reasonable. ...
X-rays - Astronomy at Swarthmore College
... d. The holy grail of science: a measurement that can discriminate between two contradictory theories 2. What we have observed/measured with the new generation of high-resolution x-ray telescopes 3. Our empirical model and fits to the data 4. An answer…and more questions ...
... d. The holy grail of science: a measurement that can discriminate between two contradictory theories 2. What we have observed/measured with the new generation of high-resolution x-ray telescopes 3. Our empirical model and fits to the data 4. An answer…and more questions ...
4 Distances in Astronomy
... The parallax method is limited to determining distances for relatively nearby stars, because otherwise the parallax angle becomes too small to measure reliably. The best ground-based telescopes can achieve a resolution of about 0:500 , which can sometimes be reduced to about 0:0100 by averaging over ...
... The parallax method is limited to determining distances for relatively nearby stars, because otherwise the parallax angle becomes too small to measure reliably. The best ground-based telescopes can achieve a resolution of about 0:500 , which can sometimes be reduced to about 0:0100 by averaging over ...
Stellar and emission line spectra
... all atoms that contributes to a spectral line is determined by the temperature through Saha’s equation. Henceforth we will use nI to denote the total number density of all hydrogen atoms with bound electrons (i.e. nI = n1 +n2 +...+n∞ ). In the case of the Hβ line, not all hydrogen atoms have an elec ...
... all atoms that contributes to a spectral line is determined by the temperature through Saha’s equation. Henceforth we will use nI to denote the total number density of all hydrogen atoms with bound electrons (i.e. nI = n1 +n2 +...+n∞ ). In the case of the Hβ line, not all hydrogen atoms have an elec ...
11 Celestial Objects and Events Every Stargazer Should See
... few minutes of totality, when only the Sun’s much fainter outer atmosphere is visible, an observer can look at the eclipsed Sun without any filters. The sight is spectacular to the unaided eye, and a low-power telescope gives a close-up view of the corona and chromosphere during totality. But before ...
... few minutes of totality, when only the Sun’s much fainter outer atmosphere is visible, an observer can look at the eclipsed Sun without any filters. The sight is spectacular to the unaided eye, and a low-power telescope gives a close-up view of the corona and chromosphere during totality. But before ...
The Color of Plants on Other Worlds
... Chlorophyll preferentially absorbs red and blue light, and carotenoid pigments (which produce the vibrant reds and yellows of fall foliage) pick up a slightly different shade of blue. All this energy gets funneled to a special chlorophyll molecule at a chemical reaction center, which splits water an ...
... Chlorophyll preferentially absorbs red and blue light, and carotenoid pigments (which produce the vibrant reds and yellows of fall foliage) pick up a slightly different shade of blue. All this energy gets funneled to a special chlorophyll molecule at a chemical reaction center, which splits water an ...
Lecture 17: Black Holes
... Puzzles from the LMC microlensing results • It suggests some fraction (~ 10%) of the halo dark matter may be in the form of compact objects. They have typical stellar masses, but they must be dark… • White dwarfs? No (constraints from metal production, cosmic background radiation…) • So, perhaps t ...
... Puzzles from the LMC microlensing results • It suggests some fraction (~ 10%) of the halo dark matter may be in the form of compact objects. They have typical stellar masses, but they must be dark… • White dwarfs? No (constraints from metal production, cosmic background radiation…) • So, perhaps t ...
Document
... - Estimated 1M years old - Most stars clouded from view by dust - Only 4-5 stars visible with small scope ...
... - Estimated 1M years old - Most stars clouded from view by dust - Only 4-5 stars visible with small scope ...
Evolved Stellar Populations
... In the centre the metallicity is low (Z<0.001) compared to a ring around it (Z>0.002). The stellar population is on average 7-8 Gyr old. Map resolution of 3-13 arcmin2. No correction for rotation yet. ...
... In the centre the metallicity is low (Z<0.001) compared to a ring around it (Z>0.002). The stellar population is on average 7-8 Gyr old. Map resolution of 3-13 arcmin2. No correction for rotation yet. ...
btg_2016_astromony
... Bunjil is represented in the sky by the star Altair (Alpha Aquilae) in the constellation Aquila. There are no prizes for guessing that Aquila is another eagle in the sky, but one of the classical 88-constellations as used by astronomers today. Bunjil has two wives in the form of black swans that sit ...
... Bunjil is represented in the sky by the star Altair (Alpha Aquilae) in the constellation Aquila. There are no prizes for guessing that Aquila is another eagle in the sky, but one of the classical 88-constellations as used by astronomers today. Bunjil has two wives in the form of black swans that sit ...
Gemini - Sochias
... 40-200 AU separation Second epoch observations of 48 stars confirm all candidates as unrelated background stars 95% upper limit of fractions of star with at least one planet of 0.5 - 13 MJup are – 0.28 for 10-25 AU – 0.13 for 25-50 AU ...
... 40-200 AU separation Second epoch observations of 48 stars confirm all candidates as unrelated background stars 95% upper limit of fractions of star with at least one planet of 0.5 - 13 MJup are – 0.28 for 10-25 AU – 0.13 for 25-50 AU ...
Big Bear Valley Astronomical Society
... connected to Sirius as the constellation itself did not take on its current form until Roman times. Sirius is a hot white star that will shine brightly for a long time to come. It is also a known binary system, with a tiny white dwarf star, coloquially known as 'the Pup', circling the brighter prima ...
... connected to Sirius as the constellation itself did not take on its current form until Roman times. Sirius is a hot white star that will shine brightly for a long time to come. It is also a known binary system, with a tiny white dwarf star, coloquially known as 'the Pup', circling the brighter prima ...
Dynamical models of the nucleus of M31
... • correct solution including absorbing boundary condition is (Bahcall & Wolf 1976) ...
... • correct solution including absorbing boundary condition is (Bahcall & Wolf 1976) ...
Stars, Galaxies, and the Universe Section 1
... The spectrum of a star that is moving toward or away from Earth appears to shift, as shown in the diagram below. ...
... The spectrum of a star that is moving toward or away from Earth appears to shift, as shown in the diagram below. ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.