Stellar Explosions
... cobalt-56 and then to iron-56 Iron-56 is the most stable nucleus, so it neither fuses nor decays Within the cores of the most massive stars, neutron capture can create heavier elements, all the way up to bismuth-209 Heaviest elements are made during the first few seconds of a supernova explosion ...
... cobalt-56 and then to iron-56 Iron-56 is the most stable nucleus, so it neither fuses nor decays Within the cores of the most massive stars, neutron capture can create heavier elements, all the way up to bismuth-209 Heaviest elements are made during the first few seconds of a supernova explosion ...
Star Types
... For example, if the mass of a star is doubled, its luminosity increases by a factor 23.5 ~ 11. Thus, stars like Sirius that are about twice as massive as the Sun are about 11 times as luminous. The more massive a Main Sequence star is, the hotter (bluer), and more luminous. The Main Sequence is a ma ...
... For example, if the mass of a star is doubled, its luminosity increases by a factor 23.5 ~ 11. Thus, stars like Sirius that are about twice as massive as the Sun are about 11 times as luminous. The more massive a Main Sequence star is, the hotter (bluer), and more luminous. The Main Sequence is a ma ...
Apparent Magnitude
... of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then ...
... of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined. The masses of many single stars can then ...
18 are exactly the same ones as for galactic star clusters of early
... The colour-magnitude array shows the usual blue sequence deviating upwards in a way which suggests a conventional age similar to that of the Pleiades, but NGC 6067 is 15-20 times richer. The cluster has red supergiants brighter than those in the otherwise similar cluster Mil. A few supergiants strad ...
... The colour-magnitude array shows the usual blue sequence deviating upwards in a way which suggests a conventional age similar to that of the Pleiades, but NGC 6067 is 15-20 times richer. The cluster has red supergiants brighter than those in the otherwise similar cluster Mil. A few supergiants strad ...
Charcteristic of Stars Powerpoint C
... Characteristics of Stars Analyze how stars are classified based on their physical characteristics. ...
... Characteristics of Stars Analyze how stars are classified based on their physical characteristics. ...
Life Cycle of a Star
... is now close to end of life - Has expanded to many times its original size (heat causes it to expand) - Hydrogen core has turned to helium and eventually to carbon - Our sun will become a red giant star in about 5 billion years ...
... is now close to end of life - Has expanded to many times its original size (heat causes it to expand) - Hydrogen core has turned to helium and eventually to carbon - Our sun will become a red giant star in about 5 billion years ...
the summary
... Galaxies are vast gravitationally bound structures consisting of gas, dust and stars. The gravitational potential of a galaxy is largely determined by the mysterious ‘dark matter’, an important but poorly understood component. The average distance between stars within a galaxy is a couple of light y ...
... Galaxies are vast gravitationally bound structures consisting of gas, dust and stars. The gravitational potential of a galaxy is largely determined by the mysterious ‘dark matter’, an important but poorly understood component. The average distance between stars within a galaxy is a couple of light y ...
M101: The Pinwheel Galaxy
... Giant spiral galaxies were not built in a day. Construction on these mammoth objects, like Messier 101 (M101) shown in this Hubble Space Telescope image, lasted billions of years. This photograph of M101, nicknamed the Pinwheel Galaxy, showcases a spiral galaxy’s well-known features. A galaxy is a c ...
... Giant spiral galaxies were not built in a day. Construction on these mammoth objects, like Messier 101 (M101) shown in this Hubble Space Telescope image, lasted billions of years. This photograph of M101, nicknamed the Pinwheel Galaxy, showcases a spiral galaxy’s well-known features. A galaxy is a c ...
PH607 – Galaxies
... stars are made), and also contain O and B stars (newly made, short-lived stars), it is apparent that spiral arms are where star formation takes place. Because O and B stars are very luminous, spiral arms are very prominent in snapshots of galaxies similar to our own. For instance, the picture below ...
... stars are made), and also contain O and B stars (newly made, short-lived stars), it is apparent that spiral arms are where star formation takes place. Because O and B stars are very luminous, spiral arms are very prominent in snapshots of galaxies similar to our own. For instance, the picture below ...
Astronomy Part 2 - Malvern Troop 7
... a) List the names of the five most visible planets. Explain which ones can appear in phases similar to lunar phases and which ones cannot, and explain why. b) Find out when each of the five most visible planets that you identified in requirement 5a will be observable in the evening sky during the ne ...
... a) List the names of the five most visible planets. Explain which ones can appear in phases similar to lunar phases and which ones cannot, and explain why. b) Find out when each of the five most visible planets that you identified in requirement 5a will be observable in the evening sky during the ne ...
Candles in the Dark
... that the Milky Way was the whole Universe, so M31 was presumably a relatively small and nearby object. Hubble calculated from the variation of his Andromeda Cepheid how far away it was and came up with the answer of more than 900 000 light years (better modern measurements give the accepted figure o ...
... that the Milky Way was the whole Universe, so M31 was presumably a relatively small and nearby object. Hubble calculated from the variation of his Andromeda Cepheid how far away it was and came up with the answer of more than 900 000 light years (better modern measurements give the accepted figure o ...
How do stars appear to move to an observer on the
... Some white dwarfs do not just cool, they have one or more large explosions. Astronomers think this may be caused by a companion star that is having material taken from it by the white dwarf. ...
... Some white dwarfs do not just cool, they have one or more large explosions. Astronomers think this may be caused by a companion star that is having material taken from it by the white dwarf. ...
Stellar Evolution
... All stars lose mass by some form of stellar wind. The most massive stars have the strongest winds; O- and B-type stars can lose a tenth of their total mass this way in only a million years. These stellar winds hollow out cavities in the interstellar medium surrounding giant stars. ...
... All stars lose mass by some form of stellar wind. The most massive stars have the strongest winds; O- and B-type stars can lose a tenth of their total mass this way in only a million years. These stellar winds hollow out cavities in the interstellar medium surrounding giant stars. ...
Powerpoint Presentation (large file)
... the formation of elements heavier than iron requires an input of energy rather than causing energy to be released ...
... the formation of elements heavier than iron requires an input of energy rather than causing energy to be released ...
HR Diagram Lab Handout
... 7. The temperature of the hottest stars is _______________. 8. The color of the hottest stars is ________________. 9. The temperature of the coldest stars is _______________. 10. The color of the coldest stars is ________________. 11. The life expectancy of a very hot star is _______________ years. ...
... 7. The temperature of the hottest stars is _______________. 8. The color of the hottest stars is ________________. 9. The temperature of the coldest stars is _______________. 10. The color of the coldest stars is ________________. 11. The life expectancy of a very hot star is _______________ years. ...
Astronomy Exam #2 for the 10
... 27) Why do high mass stars have a shorter time on the main sequence than low mass stars? Answer in few sentences? High mass stars have higher central pressures that drive faster fusion rates. The faster fusion rates “burn” the mass of star faster and have tremendously greater luminosities than lower ...
... 27) Why do high mass stars have a shorter time on the main sequence than low mass stars? Answer in few sentences? High mass stars have higher central pressures that drive faster fusion rates. The faster fusion rates “burn” the mass of star faster and have tremendously greater luminosities than lower ...
December - Rose City Astronomers
... scanty star grouping of DolidzeDžimšelejšvili 1 (Do-Dž 1). This triple star and open cluster combo is a remarkable stroke of cosmic serendipity in an area nearly devoid of other major deep-sky objects. The refractor at 44x shows the 12' diameter star cluster as six stars (9th to 11thmagnitude) embed ...
... scanty star grouping of DolidzeDžimšelejšvili 1 (Do-Dž 1). This triple star and open cluster combo is a remarkable stroke of cosmic serendipity in an area nearly devoid of other major deep-sky objects. The refractor at 44x shows the 12' diameter star cluster as six stars (9th to 11thmagnitude) embed ...
Starbursts – from 30 Doradus to Lyman
... are the dominant source of feedback in the starformation process. This is currently one of the most active fields in the starburst community. Data on star-forming galaxies are now pouring in from our large telescopes and especially from ...
... are the dominant source of feedback in the starformation process. This is currently one of the most active fields in the starburst community. Data on star-forming galaxies are now pouring in from our large telescopes and especially from ...
Diffuse Ultraviolet Emission in Galaxies
... P Cygni’s spectrum is quite unlike that of most stars. Typically, a stellar spectrum will feature numerous dark “absorption” lines, which are produced by atoms in its outer layers absorbing certain wavelengths of light emitted from below. A star’s spectrum may also exhibit bright “emission” lines—th ...
... P Cygni’s spectrum is quite unlike that of most stars. Typically, a stellar spectrum will feature numerous dark “absorption” lines, which are produced by atoms in its outer layers absorbing certain wavelengths of light emitted from below. A star’s spectrum may also exhibit bright “emission” lines—th ...
Section 19.2
... of stars • If you look closely at the stars on a clear night, you might see a slight reddish or bluish tint to some stars. • This is because their surface temperatures are different. ...
... of stars • If you look closely at the stars on a clear night, you might see a slight reddish or bluish tint to some stars. • This is because their surface temperatures are different. ...
Star Show FACILITATOR NOTES
... 5) Which star is most likely to be a red giant? a. Alpha b. Beta c. Gamma d. Delta e. Epsilon 6) Which star is most likely to be a white dwarf? a. Alpha b. Beta c. Gamma d. Delta e. Epsilon 7) Which star is furthest from Earth? a. Alpha b. Beta c. Gamma d. Delta e. Epsilon ...
... 5) Which star is most likely to be a red giant? a. Alpha b. Beta c. Gamma d. Delta e. Epsilon 6) Which star is most likely to be a white dwarf? a. Alpha b. Beta c. Gamma d. Delta e. Epsilon 7) Which star is furthest from Earth? a. Alpha b. Beta c. Gamma d. Delta e. Epsilon ...
AST 112 – Activity #4 The Stellar Magnitude System
... 2. Astronomers define a difference of 5 magnitudes to be equivalent to a multiplicative factor of 100 in brightness. How many times brighter is a magnitude + 1 star compared to a magnitude + 6 star? ...
... 2. Astronomers define a difference of 5 magnitudes to be equivalent to a multiplicative factor of 100 in brightness. How many times brighter is a magnitude + 1 star compared to a magnitude + 6 star? ...
Powerpoint for today
... Solar System formed from such "enriched" gas 4.6 billion years ago. As Milky Way ages, the abundances of elements compared to H in gas and new stars are increasing due to fusion and supernovae. Elements up to iron (56Fe, 26 p + 30 n in nucleus) ...
... Solar System formed from such "enriched" gas 4.6 billion years ago. As Milky Way ages, the abundances of elements compared to H in gas and new stars are increasing due to fusion and supernovae. Elements up to iron (56Fe, 26 p + 30 n in nucleus) ...
Galactic Evolution:
... Edwin P. Hubble (1889–1953), and still widely used today. The Hubble classification recognizes four principal types of galaxy—elliptical, spiral, barred spiral and irregular—and arranges these in a sequence that is called the tuning-fork diagram (in fig. the classification includes additional types ...
... Edwin P. Hubble (1889–1953), and still widely used today. The Hubble classification recognizes four principal types of galaxy—elliptical, spiral, barred spiral and irregular—and arranges these in a sequence that is called the tuning-fork diagram (in fig. the classification includes additional types ...
Catching Andromeda`s Light
... Andromeda’s spiral arms, he thought they might also trace the Milky Way’s spiral arms. So in 1951, Morgan mapped the locations of all the red clouds of gas he and his colleagues could find. He discovered that the gas clouds lined up along spiral arms, indicating that we live in a spiral galaxy. Why ...
... Andromeda’s spiral arms, he thought they might also trace the Milky Way’s spiral arms. So in 1951, Morgan mapped the locations of all the red clouds of gas he and his colleagues could find. He discovered that the gas clouds lined up along spiral arms, indicating that we live in a spiral galaxy. Why ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.