New brown dwarfs and giant planets
... ~50% trig/50% photo parallaxes Proper motions for all (U, V, W) velocities ...
... ~50% trig/50% photo parallaxes Proper motions for all (U, V, W) velocities ...
solon irving bailey - National Academy of Sciences
... A vivid description of this project is given in Harvard Annals 39, the first volume of the Peruvian Meteorology. After Professor Bailey and his party had passed eight consecutive days and nights at altitudes from 13,000 to 19,000 feet, urging, threatening, rewarding the Indians who shoveled the trai ...
... A vivid description of this project is given in Harvard Annals 39, the first volume of the Peruvian Meteorology. After Professor Bailey and his party had passed eight consecutive days and nights at altitudes from 13,000 to 19,000 feet, urging, threatening, rewarding the Indians who shoveled the trai ...
Type Ia supernovae as stellar endpoints and cosmological tools
... uest stars (who could have imagined they were distant stellar explosions?) have been surprising humans for at least 950 years, but probably far longer. They amazed and confounded the likes of Tycho, Kepler and Galileo, to name a few. But it was not until the separation of these events into novae and ...
... uest stars (who could have imagined they were distant stellar explosions?) have been surprising humans for at least 950 years, but probably far longer. They amazed and confounded the likes of Tycho, Kepler and Galileo, to name a few. But it was not until the separation of these events into novae and ...
exploring the universe with the low frequency array a scientific case
... active galaxies, e.g. Fig. 2) are different from those than luminous thermal radiation (e.g. bright stars and nebulae), the radio Universe appears very different from the visible Universe. During the last half century opening the radio Universe to astronomy therefore resulted in many unexpected disc ...
... active galaxies, e.g. Fig. 2) are different from those than luminous thermal radiation (e.g. bright stars and nebulae), the radio Universe appears very different from the visible Universe. During the last half century opening the radio Universe to astronomy therefore resulted in many unexpected disc ...
Quasars and Blazars
... level (Maesano et al. 1997). These observations raise the prospect of there being a Seyfert-like accretion disk in the centre of BL Lacertæ, although present data is not quite suitable for discrimination between an accretion disk model or photo-ionisation by the synchrotron jet (Corbett et al. 2000) ...
... level (Maesano et al. 1997). These observations raise the prospect of there being a Seyfert-like accretion disk in the centre of BL Lacertæ, although present data is not quite suitable for discrimination between an accretion disk model or photo-ionisation by the synchrotron jet (Corbett et al. 2000) ...
An extended main-sequence turn-off in the Small
... their colour–magnitude diagrams (CMDs) shows striking similarities, especially regarding the shape of their eMSTOs. The loci of main CMD features are so similar that they can be well described, in a first approximation, by the same mean metallicity, distance and extinction. NGC 411, however, present ...
... their colour–magnitude diagrams (CMDs) shows striking similarities, especially regarding the shape of their eMSTOs. The loci of main CMD features are so similar that they can be well described, in a first approximation, by the same mean metallicity, distance and extinction. NGC 411, however, present ...
Present-day cosmic abundances - Dr. Karl Remeis
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
... An ideal alternative to find a reference for the chemical composition of cosmic matter are normal unevolved early B-type stars of ∼8-18 M⊙ , which can provide simultaneously temporal (present-day) and local (birth place) information on chemical abundances. They can be observed not only in the solar ...
Chandra News March 2005 Published by the Chandra X-ray Center (CXC)
... & Sterken 2004) showed minima which are correlated with the X-ray drop. Radio observations by Bob Duncan and Stephen White confirmed the presence of a minimum in radio brightness but also showed secular decreases in the radio emission. This is in contrast to the RXTE observations which showed secula ...
... & Sterken 2004) showed minima which are correlated with the X-ray drop. Radio observations by Bob Duncan and Stephen White confirmed the presence of a minimum in radio brightness but also showed secular decreases in the radio emission. This is in contrast to the RXTE observations which showed secula ...
PPT - University of Waterloo
... Formation and evolution of galaxies and clusters in the early universe Star formation rates, bolometric luminosities, AGN structure Evolution of chemical elements Formation of stars & planets and physics of the interstellar medium Tracers of structure, kinematics, chemistry in star forming reg ...
... Formation and evolution of galaxies and clusters in the early universe Star formation rates, bolometric luminosities, AGN structure Evolution of chemical elements Formation of stars & planets and physics of the interstellar medium Tracers of structure, kinematics, chemistry in star forming reg ...
Unraveling the Helix Nebula: Its Structure and Knots
... lack of ions with high emissivity give the nebula a superficial appearance of having a central cavity (O1998). This single disk model must now be superseded by a more complex ...
... lack of ions with high emissivity give the nebula a superficial appearance of having a central cavity (O1998). This single disk model must now be superseded by a more complex ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.