Rocky planetesimals as the origin of metals in DZ stars
... Farihi & Zuckerman 2009a). Thus, while there is firm observational evidence of pollution via circumstellar material, as yet there is none favouring the ISM. Aannestad et al. (1993) provided an extensive spatial, kinematical and calcium abundance analysis against which they tested likely scenarios of ...
... Farihi & Zuckerman 2009a). Thus, while there is firm observational evidence of pollution via circumstellar material, as yet there is none favouring the ISM. Aannestad et al. (1993) provided an extensive spatial, kinematical and calcium abundance analysis against which they tested likely scenarios of ...
Stellar Theology and Masonic Astronomy (1882)
... UNDER the foundation on which the thing STANDS. Only then does one have a true understanding of the subject. I believe it is an "Idea whose time has come" to make this fascinating knowledge that this book provides, available to the person who wants to know the secrets of theology. This out-of-print ...
... UNDER the foundation on which the thing STANDS. Only then does one have a true understanding of the subject. I believe it is an "Idea whose time has come" to make this fascinating knowledge that this book provides, available to the person who wants to know the secrets of theology. This out-of-print ...
The Perseid Meteor Shower
... the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, we call it a "meteor shower." A meteor shower is worth watching. Perseid ...
... the sky in a few seconds, comets travel slowly across the night sky. You would have to watch one for hours or days to see its movement. Comets leave behind dust that causes meteors. When lots of meteors fall one after another, we call it a "meteor shower." A meteor shower is worth watching. Perseid ...
Chemical abundances and winds of massive stars in M31: a B
... Numerous surveys have identified OB and WR stars beyond the Magellanic Clouds e.g. Massey et al. (1986); Moffat & Shara (1987), although little quantitative analysis has been carried out to date. The only detailed studies of WolfRayet stars beyond the Magellanic Clouds have been studies of late WN s ...
... Numerous surveys have identified OB and WR stars beyond the Magellanic Clouds e.g. Massey et al. (1986); Moffat & Shara (1987), although little quantitative analysis has been carried out to date. The only detailed studies of WolfRayet stars beyond the Magellanic Clouds have been studies of late WN s ...
R585 EXPLORERS OF THE SOUTHERN SKY
... new relevant data. This book contains the names, and their meanings, of all - as yet 5252 - named minor planets. It informs about the discoverers as well as the circumstances of the discovery of all 7041 minor planets that were numbered up to June 1996. In addition to being of practical value for id ...
... new relevant data. This book contains the names, and their meanings, of all - as yet 5252 - named minor planets. It informs about the discoverers as well as the circumstances of the discovery of all 7041 minor planets that were numbered up to June 1996. In addition to being of practical value for id ...
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 ...
The Big Dipper Clock Astronomy Lesson
... A. How long does it take the Big Dipper to complete one rotation around the North Star? B. Does the Big Dipper always lie in the same orientation at the same time of night throughout the year? C. How is the changing position of the Big Dipper related to the seasonal shift of the constellations? The ...
... A. How long does it take the Big Dipper to complete one rotation around the North Star? B. Does the Big Dipper always lie in the same orientation at the same time of night throughout the year? C. How is the changing position of the Big Dipper related to the seasonal shift of the constellations? The ...
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 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 ...
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 ...
Digital STARLAB Teachers Guide
... planetarium projector designed to produce the highest quality starfield images of any projection system in its price range for portable and small fixed domes. The projector features a custom fisheye lens (patent pending) capable of depicting an accurate, high-contrast, simulated night sky with the capa ...
... planetarium projector designed to produce the highest quality starfield images of any projection system in its price range for portable and small fixed domes. The projector features a custom fisheye lens (patent pending) capable of depicting an accurate, high-contrast, simulated night sky with the capa ...
NSDL_WS_1_Astonomy
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
... http://www.compadre.org/Astronomy Hubble Space Telescope http://hubblesite.org International Year of Astronomy 2009 http://astronomy2009.us http://astronomy2009.org ...
Chemical abundances and winds of massive stars in M31: a Btype
... following Fitzpatrick (1986) in using other B-type supergiants in the LMC as the comparison stars. We chose Sk-67 108 (B0 Ia) and Sk-69 276 (O9-B0Ia) as the comparison stars on the basis of the morphology of their UV spectra compared to OB 10-64. These two stars have essentially little or no interna ...
... following Fitzpatrick (1986) in using other B-type supergiants in the LMC as the comparison stars. We chose Sk-67 108 (B0 Ia) and Sk-69 276 (O9-B0Ia) as the comparison stars on the basis of the morphology of their UV spectra compared to OB 10-64. These two stars have essentially little or no interna ...
the chandra deep field–north survey. xvii. evolution of
... unresolved X-ray sources over the entire CDF-N field, about 370 of which were previously reported in the 1 Ms CDF-N sample by Brandt et al. (2001). The field was accurately aligned to the FK5 reference frame via radio source counterparts. The median uncertainty of individual source positions is ’0B3 ...
... unresolved X-ray sources over the entire CDF-N field, about 370 of which were previously reported in the 1 Ms CDF-N sample by Brandt et al. (2001). The field was accurately aligned to the FK5 reference frame via radio source counterparts. The median uncertainty of individual source positions is ’0B3 ...
Early-type stars in the core of the young open cluster Westerlund 2
... cluster displays significant photometric variability above 1% at the 1-σ level. The twelve brightest O-type stars are found to have spectral types between O3 and O6.5, significantly earlier than previously thought. Conclusions. The distance of the early-type stars in Westerlund 2 is established to b ...
... cluster displays significant photometric variability above 1% at the 1-σ level. The twelve brightest O-type stars are found to have spectral types between O3 and O6.5, significantly earlier than previously thought. Conclusions. The distance of the early-type stars in Westerlund 2 is established to b ...
Nebulae.The Lagoon and Dumbbell Nebulae
... objects he observed and gave them numbers. This way he created the first catalogue which includes real nebulae as well as some stars, clusters and galaxies. The first version of the catalogue had 45 objects. Today their number is ...
... objects he observed and gave them numbers. This way he created the first catalogue which includes real nebulae as well as some stars, clusters and galaxies. The first version of the catalogue had 45 objects. Today their number is ...
5 Report of the Panel on Stars and Stellar Evolution
... How Do Rotation and Magnetic Fields Affect Stars? There’s an old chestnut about a dozing theorist at the weekly colloquium who opens his eyes at the end of every talk and rouses himself to ask, to great approbation for his subliminal understanding, “Yes, all very interesting, but what about rotatio ...
... How Do Rotation and Magnetic Fields Affect Stars? There’s an old chestnut about a dozing theorist at the weekly colloquium who opens his eyes at the end of every talk and rouses himself to ask, to great approbation for his subliminal understanding, “Yes, all very interesting, but what about rotatio ...
PDF - ASSA
... Nebula, is a case in point. It was first noticed as being a multiple star by the German astronomer Charles Rumker while working at Thomas Brisbane’s observatory in Australia. It was his 11th discovery and so has the discovery code RMK11. An observer with a small telescope will be well-rewarded ...
... Nebula, is a case in point. It was first noticed as being a multiple star by the German astronomer Charles Rumker while working at Thomas Brisbane’s observatory in Australia. It was his 11th discovery and so has the discovery code RMK11. An observer with a small telescope will be well-rewarded ...
Using the Heavens to Know Time to Using Time to Know the Heavens
... calendars use the stars that are just visible before sunrise or after sunset to determine the time of the year. This form of time keeping is believed to have begun during the Babylonian period around 3,000 years ago persisted till the Middle Ages and remained till the present age as the common weste ...
... calendars use the stars that are just visible before sunrise or after sunset to determine the time of the year. This form of time keeping is believed to have begun during the Babylonian period around 3,000 years ago persisted till the Middle Ages and remained till the present age as the common weste ...
Astronomy Laboratory Manual
... Using a Planisphere In principle nothing could be simpler. You turn a wheel to put your time next to your date, and presto, there's a custom-made map of the stars that are above your horizon for that moment. The edge of the oval star map represents the horizon all around you, as you would see if you ...
... Using a Planisphere In principle nothing could be simpler. You turn a wheel to put your time next to your date, and presto, there's a custom-made map of the stars that are above your horizon for that moment. The edge of the oval star map represents the horizon all around you, as you would see if you ...
HWWS 2010 - Monash University
... long pulse periods ~4-6s • Latter two are both likely classes of magnetars, (possibly young) systems with extremely high magnetic fields 1014– 1015 G • Compact central objects (CCOs) about which very little is known, associated with supernova remnants Galloway, “Accreting Neutron Stars – tiny Galact ...
... long pulse periods ~4-6s • Latter two are both likely classes of magnetars, (possibly young) systems with extremely high magnetic fields 1014– 1015 G • Compact central objects (CCOs) about which very little is known, associated with supernova remnants Galloway, “Accreting Neutron Stars – tiny Galact ...
Comparing stars - The Open University
... Though we have not marked it on Figure 5, there is a class of stars that comprises the red giants plus the stars to their left that lie between the main sequence and the supergiants. This class is the giants and is broader than that of red giants alone. You can see from Figure 5 that white dwarfs ar ...
... Though we have not marked it on Figure 5, there is a class of stars that comprises the red giants plus the stars to their left that lie between the main sequence and the supergiants. This class is the giants and is broader than that of red giants alone. You can see from Figure 5 that white dwarfs ar ...
Magnetic cycles of Sun-like stars with different levels of coronal and
... Age Main Sequence (ZAMS) on the Hertzsprung-Russell diagram. Stars, which are close to the ZAMS in Figure 1, have the lowest age among all other stars: log(Age/yr) is about 8 - 8.5. The older the star is, the farther it is from the ZAMS. Ages of all the stars in Figure 1 varies from 108 to 1010 year ...
... Age Main Sequence (ZAMS) on the Hertzsprung-Russell diagram. Stars, which are close to the ZAMS in Figure 1, have the lowest age among all other stars: log(Age/yr) is about 8 - 8.5. The older the star is, the farther it is from the ZAMS. Ages of all the stars in Figure 1 varies from 108 to 1010 year ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... Aims. We intend to obtain more accurate parameters for NGC 7419, using techniques different from those of previous authors, so that it may be used as a calibrator for more obscured clusters. Methods. We obtained Strömgren photometry of the open cluster NGC 7419, as well as classification spectroscopy ...
... Aims. We intend to obtain more accurate parameters for NGC 7419, using techniques different from those of previous authors, so that it may be used as a calibrator for more obscured clusters. Methods. We obtained Strömgren photometry of the open cluster NGC 7419, as well as classification spectroscopy ...
bode elert johann
... Atlas coelestis, star reviews, double stars, Uranus Flamsteed and Halley: Perfectionism and Piracy Astronomers are familiar with star designations such as 19 Orionis, going back to John Flamsteed (1646–1719), the first Astronomer Royal at Greenwich. This star is better known as Rigel or β Orionis. T ...
... Atlas coelestis, star reviews, double stars, Uranus Flamsteed and Halley: Perfectionism and Piracy Astronomers are familiar with star designations such as 19 Orionis, going back to John Flamsteed (1646–1719), the first Astronomer Royal at Greenwich. This star is better known as Rigel or β Orionis. T ...
Constellation
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in Western-traditional asterisms from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky.Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located. For example, saying the Horsehead Nebula is near Orion's Belt in the constellation Orion immediately locates it just south of the ecliptic and conveys that it is best observable in winter from the Northern Hemisphere.