Unraveling the Helix Nebula: Its Structure and Knots
... 213 parsecs, which is based on the trigonometric parallax of the central star (Harris et al. 1997). This yields a scale of 1′′ = 3.19 x 1015 cm and the 5.45′ semimajor axis of the nebula (O2002) is then 0.33 pc. It is necessary to comment on the nomenclature used in this paper since different and so ...
... 213 parsecs, which is based on the trigonometric parallax of the central star (Harris et al. 1997). This yields a scale of 1′′ = 3.19 x 1015 cm and the 5.45′ semimajor axis of the nebula (O2002) is then 0.33 pc. It is necessary to comment on the nomenclature used in this paper since different and so ...
GRB prompt emission
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
GRB prompt emission
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
... • GRBs are Isotropic – The beginning of the end for Galactic Models, but persistent theorists move the Galactic Models to the Halo • GRBs come in all shapes and sizes but two obvious subgroups exist I) Short, Hard Bursts II) Long, Soft Bursts ...
Clusters: age scales for stellar physics
... were identified as the culprit (Bethe 1939). This is an important lesson: pieces which do not match in this enormous puzzle (our understanding of natural phenomena) do provide, eventually, very interesting hints for new avenues and discoveries. Age and related issues belong to this category. In the ...
... were identified as the culprit (Bethe 1939). This is an important lesson: pieces which do not match in this enormous puzzle (our understanding of natural phenomena) do provide, eventually, very interesting hints for new avenues and discoveries. Age and related issues belong to this category. In the ...
Here
... This work would not have been possible without the help and support of many people. I would like to take this opportunity to offer my thanks. First and foremost I would like to thank Chris for supervising me through the past three year. I have learnt much from him in this time, from the details of s ...
... This work would not have been possible without the help and support of many people. I would like to take this opportunity to offer my thanks. First and foremost I would like to thank Chris for supervising me through the past three year. I have learnt much from him in this time, from the details of s ...
solon irving bailey - National Academy of Sciences
... the light of several asteroids. Eros, at the opposition of 1903, was far south. The period of variation, 0.2196 days, which Bailey derived from his extensive photometric and photographic observations, proved to be the most accurate of that time, and when two ciphers are added it has also been found ...
... the light of several asteroids. Eros, at the opposition of 1903, was far south. The period of variation, 0.2196 days, which Bailey derived from his extensive photometric and photographic observations, proved to be the most accurate of that time, and when two ciphers are added it has also been found ...
The Alpha Centauri binary system
... Fe II, Co I, Ni I, Cu I, Y II, Ba II. Additional data centered on the Hα spectral region, for the α Cen stars and moonlight, were secured on a number of nights in 2003 and 2004, using a 13.5µm CCD, integrated to S/N ∼ 500 and with R = 43 000. Data reduction was carried out by the standard procedure ...
... Fe II, Co I, Ni I, Cu I, Y II, Ba II. Additional data centered on the Hα spectral region, for the α Cen stars and moonlight, were secured on a number of nights in 2003 and 2004, using a 13.5µm CCD, integrated to S/N ∼ 500 and with R = 43 000. Data reduction was carried out by the standard procedure ...
Gaia 1 and 2. A pair of new satellites of the Galaxy
... i.e. without an entry in any of the clusters/galaxies catalogues available to us, has an estimated significance of ∼ 10. Note however, that initially, this candidate, dubbed here Gaia 1, was rejected as it is located in close proximity of the brightest star on the sky – Sirius2 . Figure 3 shows the ...
... i.e. without an entry in any of the clusters/galaxies catalogues available to us, has an estimated significance of ∼ 10. Note however, that initially, this candidate, dubbed here Gaia 1, was rejected as it is located in close proximity of the brightest star on the sky – Sirius2 . Figure 3 shows the ...
Document
... The catalogue, published in 1997, contains the positions and parallax of more than 100 000 stars with a precision of 0.001 arcseconds, and proper motions with a precision of 0.001 arcseconds per year. At the time of publication these values were unprecedented. Even now, more precise measurements hav ...
... The catalogue, published in 1997, contains the positions and parallax of more than 100 000 stars with a precision of 0.001 arcseconds, and proper motions with a precision of 0.001 arcseconds per year. At the time of publication these values were unprecedented. Even now, more precise measurements hav ...
asteroid wise - Lawrence Hall of Science
... Asteroids that are made of rock and/or metal are not the only menace. Comets are bodies of ice that can go crashing into planets as dramatically seen in 1994 when the large comet ShoemakerLevy 9 fragmented and created huge explosions when it struck the planet Jupiter at more than 20 different sites. ...
... Asteroids that are made of rock and/or metal are not the only menace. Comets are bodies of ice that can go crashing into planets as dramatically seen in 1994 when the large comet ShoemakerLevy 9 fragmented and created huge explosions when it struck the planet Jupiter at more than 20 different sites. ...
Cool Stars in the Galaxy — A ROSAT and ASCA View.
... soft X-ray image of the solar corona obtained using the Japanese Yohkoh satellite. The bright regions are active (emit in the X-ray band) whilst the dark regions are much less so. The large dark polar regions are coronal holes, regions which when compared to their surroundings have lower tem peratur ...
... soft X-ray image of the solar corona obtained using the Japanese Yohkoh satellite. The bright regions are active (emit in the X-ray band) whilst the dark regions are much less so. The large dark polar regions are coronal holes, regions which when compared to their surroundings have lower tem peratur ...
Full Text - Departement Natuurkunde en Sterrenkunde
... Strömgren photometric system . . . . . . . . . . . . . . . . . . . . . 165 ...
... Strömgren photometric system . . . . . . . . . . . . . . . . . . . . . 165 ...
The physics and modes of star cluster formation: observations
... is considerably more difficult, especially for intrinsically faint members whose numbers are only comparable to or significantly lower than those of the background/foreground stellar field population. The size of the cluster’s membership can be determined statistically through comparison with the backg ...
... is considerably more difficult, especially for intrinsically faint members whose numbers are only comparable to or significantly lower than those of the background/foreground stellar field population. The size of the cluster’s membership can be determined statistically through comparison with the backg ...
PDF hosted at the Radboud Repository of the Radboud University
... Despite the importance of type Ia supernovae for stellar astrophysics, galactic evolution and cosmology, the nature of the progenitor systems giving rise to these events remains mysterious, and no direct, unambiguous detection of a type Ia supernova progenitor has been made at the time of the writin ...
... Despite the importance of type Ia supernovae for stellar astrophysics, galactic evolution and cosmology, the nature of the progenitor systems giving rise to these events remains mysterious, and no direct, unambiguous detection of a type Ia supernova progenitor has been made at the time of the writin ...
The correlation between galaxy morphology and star
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
SIMsim: An End-to-End Simulation of The Space Interferometer
... depicting each of the six modules as circular balloons and the data products, intermediate and final, with rectangles. Generally, SIMsim can be viewed as a data pipe, and five of these six programs are run simultaneously in that fashion. Note, however, the feed-forward link, in which information is ...
... depicting each of the six modules as circular balloons and the data products, intermediate and final, with rectangles. Generally, SIMsim can be viewed as a data pipe, and five of these six programs are run simultaneously in that fashion. Note, however, the feed-forward link, in which information is ...
Downloaded - Royal Society Open Science
... The term also includes brown dwarfs, for which many physical relations presented here also apply. ‘Planetary systems’ is defined as systems which include SBs. The ‘disambiguation’ equations identified in figure 1 refer to relations that have appeared in multiple different forms in the previous post- ...
... The term also includes brown dwarfs, for which many physical relations presented here also apply. ‘Planetary systems’ is defined as systems which include SBs. The ‘disambiguation’ equations identified in figure 1 refer to relations that have appeared in multiple different forms in the previous post- ...
2004 SA Orlov
... over-gravitation zone, this celestial object turns into a conventional celestial object – a planet, star, etc. The super-massive BH in the center of our galaxy, rotating with a huge speed, convincingly supports the proposed concept of the nature of black holes. ...
... over-gravitation zone, this celestial object turns into a conventional celestial object – a planet, star, etc. The super-massive BH in the center of our galaxy, rotating with a huge speed, convincingly supports the proposed concept of the nature of black holes. ...
the use of fixed stars in astrology
... the unknown. The Natal Chart before you is the only thing “known” to you. And with a view to reach the “unknown”, an astrologer has to be very familiar with all the tools he needs to use. But for doing this, the absolute necessity is an accurate, casting of the Natal Chart. An accurate, Spashta Bhav ...
... the unknown. The Natal Chart before you is the only thing “known” to you. And with a view to reach the “unknown”, an astrologer has to be very familiar with all the tools he needs to use. But for doing this, the absolute necessity is an accurate, casting of the Natal Chart. An accurate, Spashta Bhav ...
Evolution of the atomic and molecular gas content of galaxies
... (2012) model, thus allowing a link to be made between the stellar and dust emission and the multi-phase gas content of galaxies. We anticipate that these predictions will be useful for planning upcoming observations of cold gas in galaxies at high redshift, and as these observations become available ...
... (2012) model, thus allowing a link to be made between the stellar and dust emission and the multi-phase gas content of galaxies. We anticipate that these predictions will be useful for planning upcoming observations of cold gas in galaxies at high redshift, and as these observations become available ...
arXiv:astro-ph/0701557v1 19 Jan 2007
... this background was in some cases not representative of the strong, complex and variable “background” emission surrounding the clusters (that is, underlying unresolved emission within the ring acting as a pedestal background). The search method had to be stopped manually when noise peaks began to be ...
... this background was in some cases not representative of the strong, complex and variable “background” emission surrounding the clusters (that is, underlying unresolved emission within the ring acting as a pedestal background). The search method had to be stopped manually when noise peaks began to be ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.