(a) Mean solar time
... Mean Sun crosses meridian at about 12 h 30 m NZST in Christchurch (172½E of Greenwich), so local MST is ~30 m behind NZST (in ChCh) (mean Sun is due north at 12h 30m NZST in ...
... Mean Sun crosses meridian at about 12 h 30 m NZST in Christchurch (172½E of Greenwich), so local MST is ~30 m behind NZST (in ChCh) (mean Sun is due north at 12h 30m NZST in ...
tut35 Magnitudes
... of asteroids, comets, and meteors. Factors such as color, albedo, and phase angles must, at times, be considered in their evaluation. The article will cover this topic with example calculations that can provide a firmer understanding of astronomical magnitudes. 1. SOME HISTORY Greek astronomers were ...
... of asteroids, comets, and meteors. Factors such as color, albedo, and phase angles must, at times, be considered in their evaluation. The article will cover this topic with example calculations that can provide a firmer understanding of astronomical magnitudes. 1. SOME HISTORY Greek astronomers were ...
AUGUSTE COMTE`S BLUNDER: AN ACCOUNT OF THE FIRST
... they perfected the techniques of photographic spectroscopy to determine Doppler shifts, by comparing the position of the Hγ absorption line in the spectra of the stars with the same line seen in emission from a hydrogen-filled Geissler discharge tube, which was mounted in the telescope. The plates w ...
... they perfected the techniques of photographic spectroscopy to determine Doppler shifts, by comparing the position of the Hγ absorption line in the spectra of the stars with the same line seen in emission from a hydrogen-filled Geissler discharge tube, which was mounted in the telescope. The plates w ...
Riccioli Measures the Stars: Observations of the
... measurements of star sizes, including those of Tycho Brahe, that put the observed diameter of first magnitude stars at a minute (60‟‟) or greater, but who then adds that through the telescope star diameters appear much smaller. Riccioli states that the telescope, in “exposing the disks of the stars ...
... measurements of star sizes, including those of Tycho Brahe, that put the observed diameter of first magnitude stars at a minute (60‟‟) or greater, but who then adds that through the telescope star diameters appear much smaller. Riccioli states that the telescope, in “exposing the disks of the stars ...
Wolf-Rayet Stars
... Figure 2: Illustration of how the ‘radius’ of the star varies with wavelength for the WC5 star HD 165763. The solid line shows the ‘radius’ at which the ‘continuum’ optical depth, τ , is 1/3, which occurs in the wind at all wavelengths. The broken line is identical except the electron scattering op ...
... Figure 2: Illustration of how the ‘radius’ of the star varies with wavelength for the WC5 star HD 165763. The solid line shows the ‘radius’ at which the ‘continuum’ optical depth, τ , is 1/3, which occurs in the wind at all wavelengths. The broken line is identical except the electron scattering op ...
Chapter 16--Properties of Stars
... century, humans classified stars primarily by their brightness and location in our sky. The names of the brightest stars within each constellation still bear Greek letters designating their order of brightness. For example, the brightest star in the constellation Centaurus is Alpha Centauri, the sec ...
... century, humans classified stars primarily by their brightness and location in our sky. The names of the brightest stars within each constellation still bear Greek letters designating their order of brightness. For example, the brightest star in the constellation Centaurus is Alpha Centauri, the sec ...
Life Histories Of Some Stars
... all? Describe the shape of the graph? Is it a straight line? A curve? 5. Give each group the list of stars attached and the HR diagram attached. Instead of height and weight, the information is in Luminosity (compared to sun) and Surface Temperature (in K). The chart also gives the star’s current st ...
... all? Describe the shape of the graph? Is it a straight line? A curve? 5. Give each group the list of stars attached and the HR diagram attached. Instead of height and weight, the information is in Luminosity (compared to sun) and Surface Temperature (in K). The chart also gives the star’s current st ...
Article PDF - IOPscience
... for each detected source, namely, the “object type” (stellar, extended, bad star, etc.), the χ 2 , which simply gives the quality of the PSF fit, the “sharpness” used to eliminate cosmic rays and extended objects, the “roundness,” the S/N, and a “crowding” parameter that describes the change in star ...
... for each detected source, namely, the “object type” (stellar, extended, bad star, etc.), the χ 2 , which simply gives the quality of the PSF fit, the “sharpness” used to eliminate cosmic rays and extended objects, the “roundness,” the S/N, and a “crowding” parameter that describes the change in star ...
CHAPTER 1 The Formation and Structure of Stars
... – Roughly 1 percent of the mass is made up of microscopic dust called interstellar dust. – The dust seems to be made mostly of carbon and silicates (rocklike minerals) mixed with or coated with frozen water. – The average distance between dust grains is about 150 m. ...
... – Roughly 1 percent of the mass is made up of microscopic dust called interstellar dust. – The dust seems to be made mostly of carbon and silicates (rocklike minerals) mixed with or coated with frozen water. – The average distance between dust grains is about 150 m. ...
The first carbon-enhanced metal-poor star found in the Sculptor
... The origin of carbon-enhanced metal-poor (CEMP) stars and their possible connection with the chemical elements produced by the first stellar generation is still highly debated. In contrast to the Galactic halo, not many CEMP stars have been found in the dwarf spheroidal galaxies around the Milky Way ...
... The origin of carbon-enhanced metal-poor (CEMP) stars and their possible connection with the chemical elements produced by the first stellar generation is still highly debated. In contrast to the Galactic halo, not many CEMP stars have been found in the dwarf spheroidal galaxies around the Milky Way ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... clusters, where blue supergiants outnumber RSGs by a factor ∼3 (Eggenberger et al. 2002). In recent years, several clusters of RSGs have been discovered towards the Scutum Arm tangent (Figer et al. 2006; Davies 2007; Clark et al. 2009a). These clusters are so heavily obscured that their population o ...
... clusters, where blue supergiants outnumber RSGs by a factor ∼3 (Eggenberger et al. 2002). In recent years, several clusters of RSGs have been discovered towards the Scutum Arm tangent (Figer et al. 2006; Davies 2007; Clark et al. 2009a). These clusters are so heavily obscured that their population o ...
Star 1 A star is a massive, luminous ball of plasma held together by
... catalogues were compiled by the ancient Babylonian astronomers of Mesopotamia in the late 2nd millennium BC, during the Kassite Period (ca. 1531-1155 BC).[9] The first star catalogue in Greek astronomy was created by Aristillus in approximately 300 BC, with the help of Timocharis.[10] The star catal ...
... catalogues were compiled by the ancient Babylonian astronomers of Mesopotamia in the late 2nd millennium BC, during the Kassite Period (ca. 1531-1155 BC).[9] The first star catalogue in Greek astronomy was created by Aristillus in approximately 300 BC, with the help of Timocharis.[10] The star catal ...
PDF only - at www.arxiv.org.
... Since 1928 the Bosscha Observatory is engaged in visual double stars studies, with the main purpose to develop new observational techniques in order to obtain results with accuracy greater than that attained till now. Two different observing techniques in the last decade have been developed for doub ...
... Since 1928 the Bosscha Observatory is engaged in visual double stars studies, with the main purpose to develop new observational techniques in order to obtain results with accuracy greater than that attained till now. Two different observing techniques in the last decade have been developed for doub ...
Cycles of magnetic activity in solar-type stars. The place of the Sun
... these 50 stars with cycles they have found only 12 stars and the Sun to be characterized by the cyclic activity of the "Excellent" class. We illustrate the method of cyclic period calculation with Scargle’s periodogram technique on the example of the Sun. We obtained the periodogram of the yearly av ...
... these 50 stars with cycles they have found only 12 stars and the Sun to be characterized by the cyclic activity of the "Excellent" class. We illustrate the method of cyclic period calculation with Scargle’s periodogram technique on the example of the Sun. We obtained the periodogram of the yearly av ...
identifying seasonal stars in kaurna astronomical traditions
... Woltatti (hot season) or Bokarra (hot north winds that blow in summer) Wadlworngatti (time of building huts against fallen trees) or Parnatti (Autumn—when the Parna star appears) Kudlilla (winter—icy cold south west winds) Wullutti (spring—Wilto/Willo star appears). Teichelmann and Schürmann attribu ...
... Woltatti (hot season) or Bokarra (hot north winds that blow in summer) Wadlworngatti (time of building huts against fallen trees) or Parnatti (Autumn—when the Parna star appears) Kudlilla (winter—icy cold south west winds) Wullutti (spring—Wilto/Willo star appears). Teichelmann and Schürmann attribu ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... Table 1 we give the number of stars for each of the subsamples. Since we wanted to derive how the stellar density varies with the galactocentric distance, we needed to ensure that the features observed are due to a physical and real overdensity and not to observational or selection biases. To accoun ...
... Table 1 we give the number of stars for each of the subsamples. Since we wanted to derive how the stellar density varies with the galactocentric distance, we needed to ensure that the features observed are due to a physical and real overdensity and not to observational or selection biases. To accoun ...
Unit 2―The Stars and Their Diurnal Motion
... horizon and is often lost in the haze. People in the Southern Hemisphere often start by first locating The Southern Cross or the Magellanic Cloud. Since the names of many constellations have historic origin, any guesses who the famous explorer was that first noticed and recorded those two (large and ...
... horizon and is often lost in the haze. People in the Southern Hemisphere often start by first locating The Southern Cross or the Magellanic Cloud. Since the names of many constellations have historic origin, any guesses who the famous explorer was that first noticed and recorded those two (large and ...
Small star patterns for telescopes and binoculars Demelza Ramakers
... asterism in the night sky. Cassiopeia has an obvious “W” shape. Not all asterisms are as large as Cassiopeia, there are also lots of small patterns that are only visible through binoculars ore telescopes. Unfortunately it’s pretty hard to find information about these small asterisms on the internet, ...
... asterism in the night sky. Cassiopeia has an obvious “W” shape. Not all asterisms are as large as Cassiopeia, there are also lots of small patterns that are only visible through binoculars ore telescopes. Unfortunately it’s pretty hard to find information about these small asterisms on the internet, ...
Here - Astrophysics Research Institute
... Unfortunately no coordinate system can be permanently fixed. This is because the Earth's rotation axis precesses slowly, with a period of 25,600 years. This happens because the Earth is not quite spherical, but is oblate and tilted. Therefore, the direction of the Sun's gravity does not pass directl ...
... Unfortunately no coordinate system can be permanently fixed. This is because the Earth's rotation axis precesses slowly, with a period of 25,600 years. This happens because the Earth is not quite spherical, but is oblate and tilted. Therefore, the direction of the Sun's gravity does not pass directl ...
Statistical analysis of stellar evolution
... to identify the evolutionary stages in the lives of stars. We generally simply refer to the set of photometric magnitudes as the magnitudes of a star. Because we focus on stellar clusters which consist of stars that are all nearly the same distance from Earth, we can use apparent luminosity in place ...
... to identify the evolutionary stages in the lives of stars. We generally simply refer to the set of photometric magnitudes as the magnitudes of a star. Because we focus on stellar clusters which consist of stars that are all nearly the same distance from Earth, we can use apparent luminosity in place ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... http://www.cfht.hawaii.edu/∼ bernt/gsc/gscbrowser.html to identify 271 guide stars from Hubble Space Telescope. An astrometric solution was found which included a single frame scale in α, δ, a rotation angle, and quadratic terms in row and column position. The resulting solution had an r.m.s. scatte ...
... http://www.cfht.hawaii.edu/∼ bernt/gsc/gscbrowser.html to identify 271 guide stars from Hubble Space Telescope. An astrometric solution was found which included a single frame scale in α, δ, a rotation angle, and quadratic terms in row and column position. The resulting solution had an r.m.s. scatte ...
Deep Sky Catalogues, the New Uranometria and Other Stories
... Prior to the publication of the new Uranometria, Murray Cragin reported on the U.S. mailing list „amastro“ about the quality of the database (DSFG) and the involved experts. As some of my project colleagues are mentioned, I was first convinced that our work hab been taken into account. However, I wa ...
... Prior to the publication of the new Uranometria, Murray Cragin reported on the U.S. mailing list „amastro“ about the quality of the database (DSFG) and the involved experts. As some of my project colleagues are mentioned, I was first convinced that our work hab been taken into account. However, I wa ...
Chemical abundances and winds of massive stars in M31: a B
... et al. (1996a) investigated the extinction in M31 using the HST/FOS data for OB 10-64 and additional M31 OB stars and concluded that the 2175Å bump is weak or absent in M31. The slope of the extinction curve was consistent with the Galactic curve, but the low reddening of their M31 target stars pre ...
... et al. (1996a) investigated the extinction in M31 using the HST/FOS data for OB 10-64 and additional M31 OB stars and concluded that the 2175Å bump is weak or absent in M31. The slope of the extinction curve was consistent with the Galactic curve, but the low reddening of their M31 target stars pre ...
magnitude handout
... How do we use this table? The magnitude difference between two stars along with Table 2 gives us the brightness ratio, how many times brighter the star is. We can also work the other way. Thus if star A is 40 times brighter than star B, the table tells us that A is 4 magnitudes brighter. It is prett ...
... How do we use this table? The magnitude difference between two stars along with Table 2 gives us the brightness ratio, how many times brighter the star is. We can also work the other way. Thus if star A is 40 times brighter than star B, the table tells us that A is 4 magnitudes brighter. It is prett ...
M81/M82/NGC3077
... The two galaxies have indeed passed each other not long ago. The line-of-sight separation is 0.27 Mpc. Calculated using the velocity difference gives a time scale of approximately 1x109 years, consistent with the enhanced star ...
... The two galaxies have indeed passed each other not long ago. The line-of-sight separation is 0.27 Mpc. Calculated using the velocity difference gives a time scale of approximately 1x109 years, consistent with the enhanced star ...
Star catalogue
A star catalogue, or star catalog, is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, and this article covers only some of the more frequently quoted ones. Star catalogues were compiled by many different ancient peoples, including the Babylonians, Greeks, Chinese, Persians, and Arabs. Most modern catalogues are available in electronic format and can be freely downloaded from NASA's Astronomical Data Center.Completeness and accuracy is described by the weakest apparent magnitude V (largest number) and the accuracy of the positions.