Luminosity
... The Nearest Stars • If the sun were a golf ball the nearest star would be in Comox • αCentauri is nearest star at 4light years then Barnard’s star ...
... The Nearest Stars • If the sun were a golf ball the nearest star would be in Comox • αCentauri is nearest star at 4light years then Barnard’s star ...
Stellar Evolution and the HR Diagram – Study Guide
... c. Which is brighter, the sun or a white dwarf? The Sun (but not as hot) d. Is Vega brighter than our sun? Yes e. Is Antares hotter than our sun? No, it’s a giant, class K or M 22. Stars that move off the main sequence first move to the _Giant_ region of the HR diagram. These stars are fusing __heli ...
... c. Which is brighter, the sun or a white dwarf? The Sun (but not as hot) d. Is Vega brighter than our sun? Yes e. Is Antares hotter than our sun? No, it’s a giant, class K or M 22. Stars that move off the main sequence first move to the _Giant_ region of the HR diagram. These stars are fusing __heli ...
April - Bristol Astronomical Society
... home to one of the loveliest open clusters in the sky, Praesepe, now more commonly known as the Beehive Cluster or M44. This lovely group of stars is just visible to the naked-eye even from Bristol, and a stunning sight in binoculars To the southeast of Leo lies the large faint constellation of Virg ...
... home to one of the loveliest open clusters in the sky, Praesepe, now more commonly known as the Beehive Cluster or M44. This lovely group of stars is just visible to the naked-eye even from Bristol, and a stunning sight in binoculars To the southeast of Leo lies the large faint constellation of Virg ...
Galaxy Characteristics
... • Motion of disk – motion of H I • Spider Diagrams – show velocity of disk motion – What should that look like? ...
... • Motion of disk – motion of H I • Spider Diagrams – show velocity of disk motion – What should that look like? ...
The Sizes of Stars
... faster than material further away. If there’s a lot of material in a disk, this will cause the atoms will rub up against each other. There will be friction! So The material will lose orbital energy and spiral in The disk will get real hot. The faster the gas moves, the greater the friction, and ...
... faster than material further away. If there’s a lot of material in a disk, this will cause the atoms will rub up against each other. There will be friction! So The material will lose orbital energy and spiral in The disk will get real hot. The faster the gas moves, the greater the friction, and ...
Lab 9
... How accurate were you? Is the criterion or criteria you used a good way to find galaxy distances? ...
... How accurate were you? Is the criterion or criteria you used a good way to find galaxy distances? ...
Big Bang and Life Cycle of Stars
... by ____________). - Leaving the dying star surrounded by gas clouds - Due to continual pressure on the core, these stars will become white dwarfs – which can be about the same size as the earth, but with the mass of a star. - Where do they move to on the HR diagram at this point? ...
... by ____________). - Leaving the dying star surrounded by gas clouds - Due to continual pressure on the core, these stars will become white dwarfs – which can be about the same size as the earth, but with the mass of a star. - Where do they move to on the HR diagram at this point? ...
Integrative Studies 410 Our Place in the Universe
... tend to be concentrated in the spiral arms • Radio frequency observations reveal the distribution of hydrogen (atomic) and molecular clouds ...
... tend to be concentrated in the spiral arms • Radio frequency observations reveal the distribution of hydrogen (atomic) and molecular clouds ...
Lecture 17, PPT version
... The radio light from plusars is called “synchrotron radiation”, a type of light that is emitted by electrons as they move on spiral paths around magnetic field lines. The “synchrotron radiation” pulses are proof of the fast rotation rates of neutron stars and the presence of an incredibly strong mag ...
... The radio light from plusars is called “synchrotron radiation”, a type of light that is emitted by electrons as they move on spiral paths around magnetic field lines. The “synchrotron radiation” pulses are proof of the fast rotation rates of neutron stars and the presence of an incredibly strong mag ...
Friday, August 28 - Otterbein University
... The Trouble with Angles • Angular size of an object cannot tell us its actual size – depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth ...
... The Trouble with Angles • Angular size of an object cannot tell us its actual size – depends on how far away it is • Sun and Moon have very nearly the same angular size (30' = ½) when viewed from Earth ...
Slide 1
... Magnitude is the degree of brightness of a star. In 1856, British astronomer Norman Pogson proposed a quantitative scale of stellar magnitudes, which was adopted by the astronomical community. Each increment in magnitude corresponds to an increase in the amount of energy by 2.512, approximately. A f ...
... Magnitude is the degree of brightness of a star. In 1856, British astronomer Norman Pogson proposed a quantitative scale of stellar magnitudes, which was adopted by the astronomical community. Each increment in magnitude corresponds to an increase in the amount of energy by 2.512, approximately. A f ...
Nebula Beginnings - University of Dayton
... This image from NASA's Hubble Space Telescope shows for the first time the inner region of a 200-billion mile diameter dust disk around the star Beta Pictoris. This region has long been hidden from ground-based telescopes because of the glare from the central star. The disk is slightly warped. If th ...
... This image from NASA's Hubble Space Telescope shows for the first time the inner region of a 200-billion mile diameter dust disk around the star Beta Pictoris. This region has long been hidden from ground-based telescopes because of the glare from the central star. The disk is slightly warped. If th ...
Photometric analysis of the globular cluster NGC5466
... old, so that their stars are mainly weak and red. They also have low values of metallicity, which is a verification that they are very old objects (the universe, in its primaeval existence, was mostly made of hydrogen and helium; then, the percentage of metals rose as the time passed by, because of ...
... old, so that their stars are mainly weak and red. They also have low values of metallicity, which is a verification that they are very old objects (the universe, in its primaeval existence, was mostly made of hydrogen and helium; then, the percentage of metals rose as the time passed by, because of ...
Clusters of galaxies
... supernovae, however far more interesting will be the multiband dataset on the cluster targets themselves. Spectroscopic followup of samples selected on colours and morphology. ...
... supernovae, however far more interesting will be the multiband dataset on the cluster targets themselves. Spectroscopic followup of samples selected on colours and morphology. ...
6. 1 Star Distances 6. 2 Apparent Brightness, Intrinsic Brightness
... important graph in astronomy becau se it sorts the stars into categories by size. Roughly 90 percent of normal stars, including the sun, fall on the main sequence, with the hotter main-sequence stars being more luminous. The giants and supergiants, however, are much larger and lie above the main seq ...
... important graph in astronomy becau se it sorts the stars into categories by size. Roughly 90 percent of normal stars, including the sun, fall on the main sequence, with the hotter main-sequence stars being more luminous. The giants and supergiants, however, are much larger and lie above the main seq ...
Hoag`s Object
... about 17±0.7 kly (5.3±0.2 kpc) while the surrounding ring has an inner 28″ diameter of 75±3 kly (24.8±1.1 kpc) and an outer 45″ diameter of 121±4 kly (39.9±1.7 kpc), which is slightly larger than the Milky Way Galaxy.[1][a] The gap separating the two stellar populations may contain some star cluster ...
... about 17±0.7 kly (5.3±0.2 kpc) while the surrounding ring has an inner 28″ diameter of 75±3 kly (24.8±1.1 kpc) and an outer 45″ diameter of 121±4 kly (39.9±1.7 kpc), which is slightly larger than the Milky Way Galaxy.[1][a] The gap separating the two stellar populations may contain some star cluster ...
PH607 – Galaxies 2
... formation event a few million years ago. The existence of these relatively young (though evolved) stars there was of a surprise to experts, who would have expected the tidal forces from the central black-hole to prevent their formation. They are much too young to have migrated far, but it seems even ...
... formation event a few million years ago. The existence of these relatively young (though evolved) stars there was of a surprise to experts, who would have expected the tidal forces from the central black-hole to prevent their formation. They are much too young to have migrated far, but it seems even ...
The Young Astronomers Newsletter Volume 22 Number 3 February
... Their new clues support the idea that double-star systems form when a disk of gas and dust whirling around one young star fragments, forming another new star in orbit with the first. ...
... Their new clues support the idea that double-star systems form when a disk of gas and dust whirling around one young star fragments, forming another new star in orbit with the first. ...
Final Exam: Chs 4-5, 12-17
... a. solar wind particles become trapped in the Earth's magnetic field. b. thermonuclear reactions halt the contraction of a protostar. c. magnetic fields inhibit the motion of charged particles in sunspots. d. electrons inside a star resist being pushed closer together than a certain limit. ____ 50. ...
... a. solar wind particles become trapped in the Earth's magnetic field. b. thermonuclear reactions halt the contraction of a protostar. c. magnetic fields inhibit the motion of charged particles in sunspots. d. electrons inside a star resist being pushed closer together than a certain limit. ____ 50. ...
Document
... The time a star stays on the main sequence depends on the star’s mass. High-mass stars burn brighter, and hotter, using up their hydrogen faster than low-mass stars. ...
... The time a star stays on the main sequence depends on the star’s mass. High-mass stars burn brighter, and hotter, using up their hydrogen faster than low-mass stars. ...
GAIA Composition, Formation and Evolution of our Galaxy
... – 10 µas ≡ 10% at 10 kpc ≡ 1 AU at 100 kpc – 10 µas/yr at 20 kpc ≡ 1 km/s ⇒ every star in the Galaxy and Local Group will be seen to move ⇒ GAIA will quantify 6-D phase space for over 300 million stars, and 5-D phase-space for over 109 stars And an interesting data reduction challenge…. ...
... – 10 µas ≡ 10% at 10 kpc ≡ 1 AU at 100 kpc – 10 µas/yr at 20 kpc ≡ 1 km/s ⇒ every star in the Galaxy and Local Group will be seen to move ⇒ GAIA will quantify 6-D phase space for over 300 million stars, and 5-D phase-space for over 109 stars And an interesting data reduction challenge…. ...
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.