Astronomy Astrophysics
... for obvious stellar overdensities towards known star forming regions in the Galactic disk. That procedure was repeated here, but we now include the area encompassing the Galactic bulge. The analysis yielded 58 new cluster candidates. These are not necessarily connected with HII regions, but clearly ...
... for obvious stellar overdensities towards known star forming regions in the Galactic disk. That procedure was repeated here, but we now include the area encompassing the Galactic bulge. The analysis yielded 58 new cluster candidates. These are not necessarily connected with HII regions, but clearly ...
Astronomy Astrophysics - Niels Bohr Institutet
... also recalibrated and redetermined the astrophysical parameters (T eff , Mv , and [Fe/H]) for all stars in our sample. Much effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of t ...
... also recalibrated and redetermined the astrophysical parameters (T eff , Mv , and [Fe/H]) for all stars in our sample. Much effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of t ...
here
... minutes to 24.8 arc minutes but increases in illumination from 27% to 48% during the course of the month. As the sun rises in late May, Venus will reach an altitude of about 23 degrees for observers at 40 degrees north. The brightest planet is at the descending node on May 9th. On May 22nd, Venus li ...
... minutes to 24.8 arc minutes but increases in illumination from 27% to 48% during the course of the month. As the sun rises in late May, Venus will reach an altitude of about 23 degrees for observers at 40 degrees north. The brightest planet is at the descending node on May 9th. On May 22nd, Venus li ...
365 days of SKYWATCHING
... night as the terminator - the line between sunset and shadow - progresses over the surface, revealing new details. Unlike a star chart, Moon feature instructions are based on lunar topography and not our Earthly cardinal directions. While these pages outline what features should be visible on any gi ...
... night as the terminator - the line between sunset and shadow - progresses over the surface, revealing new details. Unlike a star chart, Moon feature instructions are based on lunar topography and not our Earthly cardinal directions. While these pages outline what features should be visible on any gi ...
The physics and modes of star cluster formation: observations
... hindered by the fact that open clusters are born in molecular clouds and, during their formation and early evolution, are completely embedded in molecular gas and dust. They are thus obscured from view at optical wavelengths, where the traditional astronomical techniques are most effective. Fortunat ...
... hindered by the fact that open clusters are born in molecular clouds and, during their formation and early evolution, are completely embedded in molecular gas and dust. They are thus obscured from view at optical wavelengths, where the traditional astronomical techniques are most effective. Fortunat ...
The Ages of Stars
... stars. We can estimate rough ages for those stars, but a better understanding of, for instance, the dynamics of such systems and the inward migration of planets requires accurate ages. • We could better understand the behavior and future of our Sun if we could create a true cohort based on mass, com ...
... stars. We can estimate rough ages for those stars, but a better understanding of, for instance, the dynamics of such systems and the inward migration of planets requires accurate ages. • We could better understand the behavior and future of our Sun if we could create a true cohort based on mass, com ...
Super-Eddington outburst in a binary system: V4641 Sgr Mikhail Revnivtsev, Marat Gilfanov
... flares in radio (jet?) Super-Eddington outburst in a binary system: V4641 Sgr ...
... flares in radio (jet?) Super-Eddington outburst in a binary system: V4641 Sgr ...
exploring anticorrelations and light element variations
... of GC color–magnitude diagrams. In fact, while some clusters seem to photometrically comply with the simple stellar population paradigm, a growing number of them are found to be characterized by multiple main sequences and/or subgiant and/or giant branches (Piotto et al. 2007; Milone et al. 2008, e. ...
... of GC color–magnitude diagrams. In fact, while some clusters seem to photometrically comply with the simple stellar population paradigm, a growing number of them are found to be characterized by multiple main sequences and/or subgiant and/or giant branches (Piotto et al. 2007; Milone et al. 2008, e. ...
- National Optical Astronomy Observatory
... information to determine the desired stepping rate for the limb guider translation stage and the number of spectral frame to collect. (Take into account that one slit width is about half an arcsecond and the diffraction limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0 ...
... information to determine the desired stepping rate for the limb guider translation stage and the number of spectral frame to collect. (Take into account that one slit width is about half an arcsecond and the diffraction limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0 ...
Asteroid Rotation Periods
... Asteroids are small solid bodies, typically about a few kms large, that orbit the Sun between Mars and Jupiter (most of them occupy the region around 2,5AU), which is often called the asteroid belt. The name asteroid is of Greek origin and means ‘kind of a star’, or better put ‘looks like a star’. T ...
... Asteroids are small solid bodies, typically about a few kms large, that orbit the Sun between Mars and Jupiter (most of them occupy the region around 2,5AU), which is often called the asteroid belt. The name asteroid is of Greek origin and means ‘kind of a star’, or better put ‘looks like a star’. T ...
Hunting for Substructure in the Milky Way
... this orbit remains approximately circular. Astronomers measure the velocity and distances of stars to analyse the angular momentum, and from this they can determine how circular the orbit of each star is. In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has e ...
... this orbit remains approximately circular. Astronomers measure the velocity and distances of stars to analyse the angular momentum, and from this they can determine how circular the orbit of each star is. In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has e ...
Ages of Young Stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
Ages of young stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
Spectral Matching for Elemental Abundances of Evolved Stars of Globular Clusters
... used to estimate the oxygen abundance of the stars, leading to a determination of whether a particular star was oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances ...
... used to estimate the oxygen abundance of the stars, leading to a determination of whether a particular star was oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances ...
On the nature of sn stars. I. A detailed abundance study
... 10300 - 14500 K. However, there are also sn stars with solar or nearly-solar (i.e., non-CP) chemical composition. We have studied the possible contribution of different processes to the broad He I lines present in the sn stars. Although NLTE effects could not be completely ruled out, it seems that N ...
... 10300 - 14500 K. However, there are also sn stars with solar or nearly-solar (i.e., non-CP) chemical composition. We have studied the possible contribution of different processes to the broad He I lines present in the sn stars. Although NLTE effects could not be completely ruled out, it seems that N ...
Pulsed Accretion in the Young Binary &
... a mighty warrior. The heavenly ruler bade Yi to pursue the suns and bring them back to Fusang. Yet Di-Jun was an indulgent father who loved his children, so he asked the warrior to avoid using force against the brothers. The king gave Yi a red bow and a quiver of magical arrows. "If you threaten the ...
... a mighty warrior. The heavenly ruler bade Yi to pursue the suns and bring them back to Fusang. Yet Di-Jun was an indulgent father who loved his children, so he asked the warrior to avoid using force against the brothers. The king gave Yi a red bow and a quiver of magical arrows. "If you threaten the ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.