Chemical composition of 90 F and G disk dwarfs
... Particularly important is the detailed abundance analysis of 189 F and G dwarfs with −1.1 < [Fe/H] < 0.25 by Edvardsson et al. (1993a, hereafter EAGLNT). The main results from this work may be summarized as follows: (1) There are no tight relations between age, metallicity and kinematics of disk sta ...
... Particularly important is the detailed abundance analysis of 189 F and G dwarfs with −1.1 < [Fe/H] < 0.25 by Edvardsson et al. (1993a, hereafter EAGLNT). The main results from this work may be summarized as follows: (1) There are no tight relations between age, metallicity and kinematics of disk sta ...
On the nature of sn stars. I. A detailed abundance study
... and non-sn stars, to determine the possible relation between sn and CP stars and compare their chemical abundances. That most sn stars belong to open clusters allows us to search for a possible relation with fundamental parameters, including the age and rotation. We also study the possible contribut ...
... and non-sn stars, to determine the possible relation between sn and CP stars and compare their chemical abundances. That most sn stars belong to open clusters allows us to search for a possible relation with fundamental parameters, including the age and rotation. We also study the possible contribut ...
ancient cultures 114 - Stellenbosch University
... mundane and inappropriate as domestic lighting when viewed from a distance). In true astronomical terms, however, a star is a giant ball of gas, constantly undergoing nuclear processes, and as such constantly emitting electromagnetic waves. The light waves produced from these reactions are particula ...
... mundane and inappropriate as domestic lighting when viewed from a distance). In true astronomical terms, however, a star is a giant ball of gas, constantly undergoing nuclear processes, and as such constantly emitting electromagnetic waves. The light waves produced from these reactions are particula ...
to - NexStar Resource Site
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
Stellarium User Guide - Skolekonsulenterne.dk
... Stellarium may be used as an educational tool for teaching about the night sky, as an observational aide for amateur astronomers wishing to plan a night’s observing, or simply as a curiosity (it’s fun!). Because of the high quality of the graphics that Stellarium produces, it is used in some real pl ...
... Stellarium may be used as an educational tool for teaching about the night sky, as an observational aide for amateur astronomers wishing to plan a night’s observing, or simply as a curiosity (it’s fun!). Because of the high quality of the graphics that Stellarium produces, it is used in some real pl ...
PDF - ASSA
... of other properties. At the same time, some pairs can be amazingly frustrating. The bright, third magnitude upsilon Carinae, at the southern edge of the rich southern ...
... of other properties. At the same time, some pairs can be amazingly frustrating. The bright, third magnitude upsilon Carinae, at the southern edge of the rich southern ...
chapter 15 navigational astronomy
... The principal bodies orbiting the Sun are called planets. Nine principal planets are known: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Of these, only four are commonly used for celestial navigation: Venus, Mars, Jupiter, and Saturn. Except for Pluto, the orbits of the ...
... The principal bodies orbiting the Sun are called planets. Nine principal planets are known: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Of these, only four are commonly used for celestial navigation: Venus, Mars, Jupiter, and Saturn. Except for Pluto, the orbits of the ...
Stars & Galaxies - newmanlib.ibri.org
... Lifespan of a G Star • When it uses up the H in its core, it expands to form a red giant, burning H in an outer shell & He in the core. • When the He is gone, the star collapses to form a white dwarf. • The dwarf gradually cools till it ceases to shine, becoming a ...
... Lifespan of a G Star • When it uses up the H in its core, it expands to form a red giant, burning H in an outer shell & He in the core. • When the He is gone, the star collapses to form a white dwarf. • The dwarf gradually cools till it ceases to shine, becoming a ...
Nebulae.The Lagoon and Dumbbell Nebulae
... The Dumbbell Nebula, also known as M27 or NGC 6853, is the first ever found planetary nebula. It is located in the Vulpecula constellation. The nebula is a remnant of a dying star which is approximately 2 times smaller than the Sun. The star is hot and blue with temperature of 85000K (Most of these ...
... The Dumbbell Nebula, also known as M27 or NGC 6853, is the first ever found planetary nebula. It is located in the Vulpecula constellation. The nebula is a remnant of a dying star which is approximately 2 times smaller than the Sun. The star is hot and blue with temperature of 85000K (Most of these ...
StellarManual
... An incomplete sentence is presented that indicates the size and surface temperature a certain star has relative to the Sun. Students should determine how the stellar luminosity will compare with the Sun. Initially there is no equation displayed. Answer: Luminosity of a star is proportional to the sq ...
... An incomplete sentence is presented that indicates the size and surface temperature a certain star has relative to the Sun. Students should determine how the stellar luminosity will compare with the Sun. Initially there is no equation displayed. Answer: Luminosity of a star is proportional to the sq ...
Hot subdwarf stars-galactic orbits and distribution perpendicular to
... veering out to beyond 20 kpc. None of the stars can be identified uniquely as classical Population II objects. The average eccentricity ecc of the orbits of our sample is 0.24, the average normalised z-extent nze of the orbits is 0.16, and the asymmetric drift of our sample is −36 km s−1 . This sugg ...
... veering out to beyond 20 kpc. None of the stars can be identified uniquely as classical Population II objects. The average eccentricity ecc of the orbits of our sample is 0.24, the average normalised z-extent nze of the orbits is 0.16, and the asymmetric drift of our sample is −36 km s−1 . This sugg ...
Legends Night Sky Orion
... The constellation system that we have today came from the ancient Greeks. The stories, legends and reasons why they came to be in the sky originated the very first moment that man walked this Earth. - The constellations were totally imaginary creatures, beings, and objects that farmers, poets, and a ...
... The constellation system that we have today came from the ancient Greeks. The stories, legends and reasons why they came to be in the sky originated the very first moment that man walked this Earth. - The constellations were totally imaginary creatures, beings, and objects that farmers, poets, and a ...
Binarity in carbon-enhanced metal-poor stars
... as shown by Piersanti, Cristallo & Straniero (2013). Komiya et al. (2007) argue that relative high-mass AGB stars could be the companions of CEMP-no stars as they produce less s-process elements. But a problem with this scenario is that these stars would produce a lot of nitrogen, a signature that n ...
... as shown by Piersanti, Cristallo & Straniero (2013). Komiya et al. (2007) argue that relative high-mass AGB stars could be the companions of CEMP-no stars as they produce less s-process elements. But a problem with this scenario is that these stars would produce a lot of nitrogen, a signature that n ...
Educator`s Guide
... The constellation system that we have today came from the ancient Greeks. The stories, legends and reasons why they came to be in the sky originated the very first moment that man walked this Earth. - The constellations were totally imaginary creatures, beings, and objects that farmers, poets, and a ...
... The constellation system that we have today came from the ancient Greeks. The stories, legends and reasons why they came to be in the sky originated the very first moment that man walked this Earth. - The constellations were totally imaginary creatures, beings, and objects that farmers, poets, and a ...
Distance determination for RAVE stars using stellar models
... Although pulsating variables can provide accurate tracer populations, the numbers of such stars is clearly limited; ideally we would like to determine distances for large numbers of stars and not just specific populations. As a consequence there have been numerous studies utilising photometric dista ...
... Although pulsating variables can provide accurate tracer populations, the numbers of such stars is clearly limited; ideally we would like to determine distances for large numbers of stars and not just specific populations. As a consequence there have been numerous studies utilising photometric dista ...
Navigation: The Mariner`s Quadrant
... Navigation: The Mariner's Quadrant The quadrant is a very simple tool that allows the user to determine his or her latitude by measuring the altitude of a heavenly body. When used in celestial navigation or astronomy, altitude means the angle of elevation between the horizon and celestial bodies lik ...
... Navigation: The Mariner's Quadrant The quadrant is a very simple tool that allows the user to determine his or her latitude by measuring the altitude of a heavenly body. When used in celestial navigation or astronomy, altitude means the angle of elevation between the horizon and celestial bodies lik ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... potential (Roberts 1969). This scenario is in agreement with the recent work of Vallée (2014) where the hot dust (with masers and newborn stars) seems to peak near the inner arm edge while the stars are all over the arms. Furthermore, to analyze the interaction between the arm and the stellar compon ...
... potential (Roberts 1969). This scenario is in agreement with the recent work of Vallée (2014) where the hot dust (with masers and newborn stars) seems to peak near the inner arm edge while the stars are all over the arms. Furthermore, to analyze the interaction between the arm and the stellar compon ...
Galactic Nebulae
... Massive O-type giants in NGC6530 Illuminating eastern part of Lagoon Nebula Brighest (western) part - Hourglass nebula –is excited by 2 massive OType supergiants to west of M8 . 60 B-type giants are embedded In Lagoon nebula - more than Orion nebula ...
... Massive O-type giants in NGC6530 Illuminating eastern part of Lagoon Nebula Brighest (western) part - Hourglass nebula –is excited by 2 massive OType supergiants to west of M8 . 60 B-type giants are embedded In Lagoon nebula - more than Orion nebula ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... on PSF-subtracted images and added to the list of trial positions). The resulting lists of magnitudes and positions were then transformed to a common coordinate system, defined by the positions on one of the V frames. The correction included terms for pixel scale (identical in x and y) and for rotat ...
... on PSF-subtracted images and added to the list of trial positions). The resulting lists of magnitudes and positions were then transformed to a common coordinate system, defined by the positions on one of the V frames. The correction included terms for pixel scale (identical in x and y) and for rotat ...
I. Constellations
... ____stars____ named after ____an animal____, ____a person____ or ___ an object ____. B. In modern astronomy, a constellation is defined as a specific ____area____ of the sky as determined by the International Astronomical Union (IAU). C. The celestial sphere is divided into __88___ contiguous region ...
... ____stars____ named after ____an animal____, ____a person____ or ___ an object ____. B. In modern astronomy, a constellation is defined as a specific ____area____ of the sky as determined by the International Astronomical Union (IAU). C. The celestial sphere is divided into __88___ contiguous region ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
... means of the rising and setting of various stars and constellations. Hesiod encourages us to begin the harvest at the rising of the Pleiades, and to plough at their setting; Alcaeus encourages us to drink at the rising of Sirius; and Horace assures us that a man content with his lot is not disturbed ...
... means of the rising and setting of various stars and constellations. Hesiod encourages us to begin the harvest at the rising of the Pleiades, and to plough at their setting; Alcaeus encourages us to drink at the rising of Sirius; and Horace assures us that a man content with his lot is not disturbed ...
Properties of Wolf-Rayet Stars - Paul Crowther, University of Sheffield
... intrinsically weak emission lines. For example, HD 93131 (WN6ha) has a He ii λ4686 emission equivalent width which is an order of magnitude smaller than that observed in other WN6 stars; the ‘ha’ nomenclature indicates that hydrogen is seen both in absorption and emission. From a standard spectrosco ...
... intrinsically weak emission lines. For example, HD 93131 (WN6ha) has a He ii λ4686 emission equivalent width which is an order of magnitude smaller than that observed in other WN6 stars; the ‘ha’ nomenclature indicates that hydrogen is seen both in absorption and emission. From a standard spectrosco ...
Article PDF - IOPscience
... are created in order to provide an initial guess of the background. At the same time, the X, Y offsets between each image and a reference image (for G11 the image u9x6f001m_c0f in the HST archive, see http://archive.stsci.edu/) are measured using the IMEXAMINE task in IRAF. These offsets are input i ...
... are created in order to provide an initial guess of the background. At the same time, the X, Y offsets between each image and a reference image (for G11 the image u9x6f001m_c0f in the HST archive, see http://archive.stsci.edu/) are measured using the IMEXAMINE task in IRAF. These offsets are input i ...
How to Build an Astrolabe
... * accuracy of assembly - cutting out, hole placement etc. * levels of accuracy of various parts: e.g. to nearest degree on protractor round edge, to nearest 5 degrees of altitude. * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe ...
... * accuracy of assembly - cutting out, hole placement etc. * levels of accuracy of various parts: e.g. to nearest degree on protractor round edge, to nearest 5 degrees of altitude. * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe ...
How to Build an Astrolabe - St John`s College, Cambridge
... * accuracy of assembly - cutting out, hole placement etc. * levels of accuracy of various parts: e.g. to nearest degree on protractor round edge, to nearest 5 degrees of altitude. * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe ...
... * accuracy of assembly - cutting out, hole placement etc. * levels of accuracy of various parts: e.g. to nearest degree on protractor round edge, to nearest 5 degrees of altitude. * the earth is not a perfect sphere and does not move perfectly regularly through the sky. This means that the astrolabe ...
Crux
Crux /ˈkrʌks/, located in the deep southern sky, is the smallest yet one of the most distinctive of the 88 modern constellations. Its name is Latin for cross, and it is dominated by a cross-shaped asterism that is commonly known as the Southern Cross. Although visible to the Ancient Greeks, it was seen as part of the constellation Centaurus, and not defined or accurately mapped till the 16th century.Known as Acrux, blue-white Alpha Crucis is the constellation's brightest star and the bottom star of the cross. Nearly as bright are Beta and Gamma, while Delta and Epsilon make up the asterism. Many of the constellation's brighter stars are members of the Scorpius–Centaurus Association, a loose group of hot blue-white stars that appear to share a common origin and motion across the Milky Way. Two star systems have been found to have planets. The constellation also contains four Cepheid variables visible to the naked eye under optimum conditions. Crux also contains the Jewel Box, a bright open cluster, and the Coalsack Nebula, the most prominent dark nebula in the sky.