Slide 1
... light of particular wavelengths by the atoms in the outer part of the star. See Figure 1 (B). Depending on the pattern of spectroscopic absorption and emission lines, stars may be grouped into particular spectral types. The traditional spectral types are denoted by the letters O, B, A, F, G, K and M ...
... light of particular wavelengths by the atoms in the outer part of the star. See Figure 1 (B). Depending on the pattern of spectroscopic absorption and emission lines, stars may be grouped into particular spectral types. The traditional spectral types are denoted by the letters O, B, A, F, G, K and M ...
Omega Centauri
... Y=0.40 (e.g., Omega Centauri, NGC2808) 3.Clusters with broadened or splitted MS (as NGC6752 and 47Tuc) 4.Complex objects like M54 (= Omega Cen?) 5.Intermediate objects like M22 (=M54, Omega Cen?) 6.Clusters with double SGB or RGB (e.g., NGC 1851, NGC6388, NGC 5286, M4, and many others) 7.The LMC/SMC ...
... Y=0.40 (e.g., Omega Centauri, NGC2808) 3.Clusters with broadened or splitted MS (as NGC6752 and 47Tuc) 4.Complex objects like M54 (= Omega Cen?) 5.Intermediate objects like M22 (=M54, Omega Cen?) 6.Clusters with double SGB or RGB (e.g., NGC 1851, NGC6388, NGC 5286, M4, and many others) 7.The LMC/SMC ...
Module code: AA1
... The hypothetical question how the night sky would appear if all stars would possess the same luminosity as the sun or Barnard’s star was analysed with Excel diagrams leading to the conclusion that in case of the sun the night sky would have less bright stars and in case of Barnard’s star with the na ...
... The hypothetical question how the night sky would appear if all stars would possess the same luminosity as the sun or Barnard’s star was analysed with Excel diagrams leading to the conclusion that in case of the sun the night sky would have less bright stars and in case of Barnard’s star with the na ...
Leo Powerpoint
... Regulus, shining at the heart of Leo the Lion, is near the end of the list of first magnitude stars. At a distance of only 79 light years, it shines in our sky at magnitude 1.35. The Latin name means "the little king," the reference to a kingly star going back to ancient times. Regulus marks the end ...
... Regulus, shining at the heart of Leo the Lion, is near the end of the list of first magnitude stars. At a distance of only 79 light years, it shines in our sky at magnitude 1.35. The Latin name means "the little king," the reference to a kingly star going back to ancient times. Regulus marks the end ...
Friday, April 25 - Otterbein University
... • The orbital plane of the pair almost edge-on to our line of sight • We observe periodic changes in the starlight as one member of the binary passes in front of the other ...
... • The orbital plane of the pair almost edge-on to our line of sight • We observe periodic changes in the starlight as one member of the binary passes in front of the other ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... common set of genes,” said Mark Krumholz, associate professor at University of California, Santa Cruz. The pattern of abundances, set at birth, is consistent regardless of an individual star’s spectral type. But most stellar families don’t stay together: stars don’t form fast enough for them to rema ...
... common set of genes,” said Mark Krumholz, associate professor at University of California, Santa Cruz. The pattern of abundances, set at birth, is consistent regardless of an individual star’s spectral type. But most stellar families don’t stay together: stars don’t form fast enough for them to rema ...
How Bright is that star?
... Luminosity is the amount of energy a star gives off as light. Measured in Watts or Solar Units or “Sols” However for all practical purposes Absolute magnitude and Luminosity of a star measure the same thing. Absolute Magnitude Approximate Luminosity ...
... Luminosity is the amount of energy a star gives off as light. Measured in Watts or Solar Units or “Sols” However for all practical purposes Absolute magnitude and Luminosity of a star measure the same thing. Absolute Magnitude Approximate Luminosity ...
star a
... A spectroscopic binary has spectral lines that shift back and forth in wavelength. This is caused by the Doppler effect, as the orbits of the stars carry them first toward then away from the Earth. An eclipsing binary is a system whose orbits are viewed nearly edge-on from the Earth, so that one sta ...
... A spectroscopic binary has spectral lines that shift back and forth in wavelength. This is caused by the Doppler effect, as the orbits of the stars carry them first toward then away from the Earth. An eclipsing binary is a system whose orbits are viewed nearly edge-on from the Earth, so that one sta ...
Stars, Stellar classification, H
... These two stars have about the same luminosity -which one appears brighter? A. Alpha Centauri B. The Sun ...
... These two stars have about the same luminosity -which one appears brighter? A. Alpha Centauri B. The Sun ...
Sample multiple choice questions for Exam 2
... provided. 1. Most of the bright stars in the sky are bright because they are close (within 10 light years) to our Sun. a) correct b) wrong: Most are intrinsically bright and lie far from the Sun. c) wrong: Close means closer than 1 parsec. d) wrong: This is true only for green stars. e) wrong: Both ...
... provided. 1. Most of the bright stars in the sky are bright because they are close (within 10 light years) to our Sun. a) correct b) wrong: Most are intrinsically bright and lie far from the Sun. c) wrong: Close means closer than 1 parsec. d) wrong: This is true only for green stars. e) wrong: Both ...
astrocoursespring2012lec5-1-1
... Then… as the telescope looks outward the realm of the superclusters stretches into unmapped deserts of time…As a telescope looks backward into time (or out into space) the galaxies appear smaller and fainter. When a telescope probes about 5 billion light years into look-back time, it can detect only ...
... Then… as the telescope looks outward the realm of the superclusters stretches into unmapped deserts of time…As a telescope looks backward into time (or out into space) the galaxies appear smaller and fainter. When a telescope probes about 5 billion light years into look-back time, it can detect only ...
Magnitude. . . ?
... reads that “the minor planet was of fifteenth brightness class”, i.e., that its faintness was approximately fifteen magnitudes, one understands that it was some one million times fainter than Vega, or than a fixed star of zero-th brightness class (fifteen is three times five, and the third power of ...
... reads that “the minor planet was of fifteenth brightness class”, i.e., that its faintness was approximately fifteen magnitudes, one understands that it was some one million times fainter than Vega, or than a fixed star of zero-th brightness class (fifteen is three times five, and the third power of ...
Presentation 2
... One beautiful summer night, Josslyn decided to join her grandparents on their nightly walk along the grassy pasture. As they took part in their walk, Josslyn stared into the clear summer sky studying all the bright stars in her view. She had glazed at the sky many times before, but tonight, she not ...
... One beautiful summer night, Josslyn decided to join her grandparents on their nightly walk along the grassy pasture. As they took part in their walk, Josslyn stared into the clear summer sky studying all the bright stars in her view. She had glazed at the sky many times before, but tonight, she not ...
Build your own Galaxy - McDonald Observatory
... Central bulge: the cotton-ball dome.The rounded structure in the central 6,400 lightyears of the galaxy’s center is what astronomers call the bulge of our galaxy. Disk: foam batting on the poster board. The disk of stars in our galaxy contains gas, dust, and stars. Generally, it is flat like the bri ...
... Central bulge: the cotton-ball dome.The rounded structure in the central 6,400 lightyears of the galaxy’s center is what astronomers call the bulge of our galaxy. Disk: foam batting on the poster board. The disk of stars in our galaxy contains gas, dust, and stars. Generally, it is flat like the bri ...
Properties of Ellipticals and Spirals
... massive, hot, young and luminous stars dominate the overall light, thus giving it a bluish hue. The bright yellowish looking regions, mostly the bulge, also have some young stars, however, since there is relatively more dust in the bulge, we see only the longer wavelength light that can penetrate th ...
... massive, hot, young and luminous stars dominate the overall light, thus giving it a bluish hue. The bright yellowish looking regions, mostly the bulge, also have some young stars, however, since there is relatively more dust in the bulge, we see only the longer wavelength light that can penetrate th ...
Slide 1
... In 1604, stars within a constellation were ranked in order of brightness, and labeled with Greek letters (Alpha Centauri) In the early 18th century, stars were numbered from west to east in a constellation (61 Cygni) ...
... In 1604, stars within a constellation were ranked in order of brightness, and labeled with Greek letters (Alpha Centauri) In the early 18th century, stars were numbered from west to east in a constellation (61 Cygni) ...
Diffuse Ultraviolet Emission in Galaxies
... producing large amounts of UV radiation. We divided these stars into two groups, using their traditional names: “O-type” stars, with initial masses >20 Msun and lifespans < 5 Myr, and “B-type” stars of 8–20 Msun, which live 5–25 Myr. Then we went back to the ACS exposures to investigate the location ...
... producing large amounts of UV radiation. We divided these stars into two groups, using their traditional names: “O-type” stars, with initial masses >20 Msun and lifespans < 5 Myr, and “B-type” stars of 8–20 Msun, which live 5–25 Myr. Then we went back to the ACS exposures to investigate the location ...
Distance
... – 10th mag star is 100× fainter than 5th mag – 20th mag star is 10,000× fainter than 10th mag ...
... – 10th mag star is 100× fainter than 5th mag – 20th mag star is 10,000× fainter than 10th mag ...
1 Introduction - High Point University
... One of the best known distance indicators are RR Lyrae Stars. These are pulsating variable stars—stars that change in brightness over time because they are periodically growing larger and smaller much like breathing. These stars pulsate because the release of energy from the outer layers of the star ...
... One of the best known distance indicators are RR Lyrae Stars. These are pulsating variable stars—stars that change in brightness over time because they are periodically growing larger and smaller much like breathing. These stars pulsate because the release of energy from the outer layers of the star ...
Extragalactic Distances from Planetary Nebulae
... Elliptical galaxies do not have many (any?) 2 M main sequence stars. But they do have large numbers of 1 M stars. If some are in close binary systems which coalesce on the main sequence, the product may evolve into an [O III]-bright planetary. The ratio of bright planetaries to blue stragglers is ...
... Elliptical galaxies do not have many (any?) 2 M main sequence stars. But they do have large numbers of 1 M stars. If some are in close binary systems which coalesce on the main sequence, the product may evolve into an [O III]-bright planetary. The ratio of bright planetaries to blue stragglers is ...
16. Properties of Stars
... apparent brightness and distance, using the luminosity-distance formula: apparent brightness = luminosity / (4 × distance2). The distance to nearby stars can be measured by parallax, the shift in theapparent position of a star with respect to more distant stars as the Earth moves around the Sun. ...
... apparent brightness and distance, using the luminosity-distance formula: apparent brightness = luminosity / (4 × distance2). The distance to nearby stars can be measured by parallax, the shift in theapparent position of a star with respect to more distant stars as the Earth moves around the Sun. ...
Microsoft Power Point version
... luminosity, we can calculate its distance from the luminosity–distance formula. This property of Cepheids enables us to measure distances to many other galaxies in which these variable stars have been observed. ...
... luminosity, we can calculate its distance from the luminosity–distance formula. This property of Cepheids enables us to measure distances to many other galaxies in which these variable stars have been observed. ...
Planetary Configurations
... using measures of spectral line widths – I = supergiant – III = giant – V = main sequence ...
... using measures of spectral line widths – I = supergiant – III = giant – V = main sequence ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.