arXiv:astro-ph/9701131v1 18 Jan 1997
... stratified radiative cores. Second, as recognized by Salpeter (1982), full convection precludes the buildup of composition gradients which are ultimately responsible (in part) for a star’s ascent up the red giant branch. The lowest mass stars burn all their hydrogen into helium over an η = 13 time ...
... stratified radiative cores. Second, as recognized by Salpeter (1982), full convection precludes the buildup of composition gradients which are ultimately responsible (in part) for a star’s ascent up the red giant branch. The lowest mass stars burn all their hydrogen into helium over an η = 13 time ...
Astronomical Circumstances
... This DRAFT document is an excerpt from Principles of Planetary Biology, by Tom E. Morris. based on their brightness (magnitude), temperature, receive each moment, so the warmer the planet will get radius, luminosity, mix of colors (spectral class), and (all other things being equal). This being the ...
... This DRAFT document is an excerpt from Principles of Planetary Biology, by Tom E. Morris. based on their brightness (magnitude), temperature, receive each moment, so the warmer the planet will get radius, luminosity, mix of colors (spectral class), and (all other things being equal). This being the ...
ASPEN WORKSHOP 2003
... Ferguson—GOODS Update Hierarchical models make simple predix for disk galaxy sizes: R = 1/H at fixed vcirc or H-2/3 at fixed mass (Mo, Mau+White) 16 U dropouts in CDF-S 150 sq arcmins using ESO U photometry, (none of 4 sets deep enough) sample of 1—6 Steidel Lstar, rejected Sextractor “stellar” ima ...
... Ferguson—GOODS Update Hierarchical models make simple predix for disk galaxy sizes: R = 1/H at fixed vcirc or H-2/3 at fixed mass (Mo, Mau+White) 16 U dropouts in CDF-S 150 sq arcmins using ESO U photometry, (none of 4 sets deep enough) sample of 1—6 Steidel Lstar, rejected Sextractor “stellar” ima ...
Explosive sources of the highest energy radiation
... fields such as those found around pulsars. These conditions can be produced in a wide variety of astrophysical objects: from the Sun, to binary systems in our galaxy, to extragalactic objects such as gamma-ray bursts. ...
... fields such as those found around pulsars. These conditions can be produced in a wide variety of astrophysical objects: from the Sun, to binary systems in our galaxy, to extragalactic objects such as gamma-ray bursts. ...
20_Testbank
... that their distances can be measured with stellar parallax. This gives us a cluster of stars that we can plot on an H-R diagram to determine the luminosity of the main sequence. For more distant clusters, we can compare their main sequence to this fit and measure their distance by the method of main ...
... that their distances can be measured with stellar parallax. This gives us a cluster of stars that we can plot on an H-R diagram to determine the luminosity of the main sequence. For more distant clusters, we can compare their main sequence to this fit and measure their distance by the method of main ...
Characterization and Subtraction of Well
... ghosts caused by the optics in the NIC2 images. The first, evident in most of the targets and in all four filters, is a large ring of diameter 50 that is usually found near the bottom of the field. The ring appears to be a highly defocused reflection of the target star, and its location is very sens ...
... ghosts caused by the optics in the NIC2 images. The first, evident in most of the targets and in all four filters, is a large ring of diameter 50 that is usually found near the bottom of the field. The ring appears to be a highly defocused reflection of the target star, and its location is very sens ...
ASTRONOMIA SPAIN inglés.qxd
... correlation between the existing luminosity dispersion and the light curve decline rates. In 1984, it was not yet clear if the nature of these outbursts was thermonuclear or gravitational and the cause of the above mentioned correlation (known as the “Phillips Relation”) was unknown. What was the so ...
... correlation between the existing luminosity dispersion and the light curve decline rates. In 1984, it was not yet clear if the nature of these outbursts was thermonuclear or gravitational and the cause of the above mentioned correlation (known as the “Phillips Relation”) was unknown. What was the so ...
The Milky Way as a galaxy
... is much smaller than its distance to us. Targets for applying this method are the Hyades, a cluster of about 200 stars at a mean distance of D 45 pc, the Ursa-Major group of about 60 stars at D 24 pc, and the Pleiades with about 600 stars at D 130 pc. Historically the distance determination to ...
... is much smaller than its distance to us. Targets for applying this method are the Hyades, a cluster of about 200 stars at a mean distance of D 45 pc, the Ursa-Major group of about 60 stars at D 24 pc, and the Pleiades with about 600 stars at D 130 pc. Historically the distance determination to ...
Hidden57_rf
... This stunningly colourful picture shows off the rich structure of the supernova remnant Cassiopeia A. It is composed of images using three different wavebands of light. Infrared data from the Spitzer Space Telescope are coloured red; visible data from the Hubble Space Telescope are yellow; and X-ray ...
... This stunningly colourful picture shows off the rich structure of the supernova remnant Cassiopeia A. It is composed of images using three different wavebands of light. Infrared data from the Spitzer Space Telescope are coloured red; visible data from the Hubble Space Telescope are yellow; and X-ray ...
Populations of Galaxies and their Formation at z < 7
... What could these galaxies be, and are they most of the galaxy population at high redshift? No. ...
... What could these galaxies be, and are they most of the galaxy population at high redshift? No. ...
McDonald I....Tisserand, P. et al ExELS an
... approach, based on version 1106 of the Besanc¸on population synthesis Galaxy model (Robin et al. 2003), which incorporates a three-dimensional dust model to compute extinction and reddening (Marshall et al. 2005). The populations included in the model are such that stars are limited to between 0.08 ...
... approach, based on version 1106 of the Besanc¸on population synthesis Galaxy model (Robin et al. 2003), which incorporates a three-dimensional dust model to compute extinction and reddening (Marshall et al. 2005). The populations included in the model are such that stars are limited to between 0.08 ...
Effects of triple-α and C(α, γ )16 O reaction rates on the supernova
... massive star evolution. As a consequence, explosive nucleosynthesis and the resulting supernova yields of a massive star would be influenced seriously by the two rates. We select four combinations from the available nuclear data for the two rates, that is, Fynbo–CF85, Fynbo–Bu96, OKK–CF85, and OKK–B ...
... massive star evolution. As a consequence, explosive nucleosynthesis and the resulting supernova yields of a massive star would be influenced seriously by the two rates. We select four combinations from the available nuclear data for the two rates, that is, Fynbo–CF85, Fynbo–Bu96, OKK–CF85, and OKK–B ...
Stars, Galaxies, and Beyond
... Ivezić for allowing me this opportunity to explore these many important topics in astrophysics. Sources: The materials in this summary derive from the lecture notes, the assigned textbook, and many Web and published scientific articles and other sources as noted. I do not consider Wikipedia to be a ...
... Ivezić for allowing me this opportunity to explore these many important topics in astrophysics. Sources: The materials in this summary derive from the lecture notes, the assigned textbook, and many Web and published scientific articles and other sources as noted. I do not consider Wikipedia to be a ...
Astronomy Today Charting the Heavens: The Foundations of
... 7) The prime meridian of the sky coordinates is the Sun's position at the ________. Answer: Vernal Equinox Section Ref: More Prec. 1-2 8) The Sun's lowest position in the sky occurs at the ________. Answer: winter solstice Section Ref: 1.4 9) The two days when the Sun rises due east and sets due we ...
... 7) The prime meridian of the sky coordinates is the Sun's position at the ________. Answer: Vernal Equinox Section Ref: More Prec. 1-2 8) The Sun's lowest position in the sky occurs at the ________. Answer: winter solstice Section Ref: 1.4 9) The two days when the Sun rises due east and sets due we ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.