Galaxy Evolution
... contribute very little to the luminosity of the event. This is because high-mass stars are much more luminous than low-mass ones. A star of 100 M is about 1000 000 times brighter than the Sun. Even if there is only one star of 100 M every 500 stars of 1 M , it alone outshines all of them, whose c ...
... contribute very little to the luminosity of the event. This is because high-mass stars are much more luminous than low-mass ones. A star of 100 M is about 1000 000 times brighter than the Sun. Even if there is only one star of 100 M every 500 stars of 1 M , it alone outshines all of them, whose c ...
Navigation: The Mariner`s Quadrant
... edges for sighting. The only scale needed was the degree marks on the curved edge. It was light and easy to handle. ...
... edges for sighting. The only scale needed was the degree marks on the curved edge. It was light and easy to handle. ...
Accretion and Current Discs Controlled by Strong Magnetic Field
... from 1.4 to 3 MSun, where MSun = 2×1030 kg is a solar mass, 1.4 MSun is a Chandrasekhar limit, and 3 MSun is an Oppenheimer-Volkoff limit. The neutron stars consist mainly of neutrons. Radius of a neutron star is ~10 - 20 km. The material density in neutron stars could be up to 1017 - 1018 kg·m–3. I ...
... from 1.4 to 3 MSun, where MSun = 2×1030 kg is a solar mass, 1.4 MSun is a Chandrasekhar limit, and 3 MSun is an Oppenheimer-Volkoff limit. The neutron stars consist mainly of neutrons. Radius of a neutron star is ~10 - 20 km. The material density in neutron stars could be up to 1017 - 1018 kg·m–3. I ...
Night Sky Observations
... Kelvin (K): Zero K is absolute zero, equal to minus 273 degrees Celsius; ice melts at 273 K (0° C) Astronomical Unit (A.U.): The average distance from the Earth to the Sun, approximately 150 million km. Light Year: The distance travelled by light in one year = 9 500 billion km (63,240 AU). Parsec: T ...
... Kelvin (K): Zero K is absolute zero, equal to minus 273 degrees Celsius; ice melts at 273 K (0° C) Astronomical Unit (A.U.): The average distance from the Earth to the Sun, approximately 150 million km. Light Year: The distance travelled by light in one year = 9 500 billion km (63,240 AU). Parsec: T ...
The 2006 RBSE Journal - National Optical Astronomy Observatory
... Significant variation was detected; and there were a couple of microvariability events in the graph. The time scale if the change is such that something exceptionally small must have interfered with the flux to cause it. With changes happening over the course of just a few minutes could be caused by ...
... Significant variation was detected; and there were a couple of microvariability events in the graph. The time scale if the change is such that something exceptionally small must have interfered with the flux to cause it. With changes happening over the course of just a few minutes could be caused by ...
Emergency Land Navigation
... GEM1506K Heavenly Mathematics Advancements in navigational technology have made finding way much easier than before. Nowadays, all kinds of navigational equipment are available, from the basic compass, map, sextant and almanacs to the highly efficient radars and GPS devices. Although technology bri ...
... GEM1506K Heavenly Mathematics Advancements in navigational technology have made finding way much easier than before. Nowadays, all kinds of navigational equipment are available, from the basic compass, map, sextant and almanacs to the highly efficient radars and GPS devices. Although technology bri ...
SAGE_prop
... Beyond the provision of light and heat, the correlation between the occurrence of sunspots and displays of spectacular aurora gave us early clues to the existence of a chain of events linking solar phenomena to a terrestrial response. Proctor in 1870 described an event where at a station in Norway “ ...
... Beyond the provision of light and heat, the correlation between the occurrence of sunspots and displays of spectacular aurora gave us early clues to the existence of a chain of events linking solar phenomena to a terrestrial response. Proctor in 1870 described an event where at a station in Norway “ ...
Gas fraction and star formation efficiency at z< 1.0
... favorable 3mm atmospheric window, between 81 and 115 GHz, all redshifts can be observed with at least one line of the CO rotational ladder, except between z=0.4 and 1. For galaxies in this range, CO lines must be searched for in the 2mm or 1mm range, and several CO lines are out of reach. In this pa ...
... favorable 3mm atmospheric window, between 81 and 115 GHz, all redshifts can be observed with at least one line of the CO rotational ladder, except between z=0.4 and 1. For galaxies in this range, CO lines must be searched for in the 2mm or 1mm range, and several CO lines are out of reach. In this pa ...
On the nature of sn stars. I. A detailed abundance study
... questioned. There is no general agreement about their origin. We aim to derive abundances for a sample of 9 stars, including sn 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 ...
... questioned. There is no general agreement about their origin. We aim to derive abundances for a sample of 9 stars, including sn 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 ...
Galactic Chemical Evolution and the Oxygen Isotopic Composition
... newly synthesized elements into the interstellar medium (ISM). Oxygen is the third most abundant element in the Universe after H and He and is present in both the gas and solid phases of the ISM and solar nebula; its elemental abundance can be readily determined in solar-type stars and its isotopes ...
... newly synthesized elements into the interstellar medium (ISM). Oxygen is the third most abundant element in the Universe after H and He and is present in both the gas and solid phases of the ISM and solar nebula; its elemental abundance can be readily determined in solar-type stars and its isotopes ...
Detection of Artificial Satellites in Images Acquired in Track Rate Mode
... centroids of the detected star streaks. The color code indicates how they are detected. Yellow means the bright streak is detected in the first step with the binary mask A. Red means the streak is detected with the unmerging process. Yellow is for the faint streaks detected in the second step with ...
... centroids of the detected star streaks. The color code indicates how they are detected. Yellow means the bright streak is detected in the first step with the binary mask A. Red means the streak is detected with the unmerging process. Yellow is for the faint streaks detected in the second step with ...
Gaia talk
... What does micro-arcsecond mean? • Precision: 50pico-rad, human hair at 1000km, coin on the moon • Astrometry needs more than signal to noise and image processing • One must have a physical model and understanding of every contribution to the error budget at an appropriate level • Einstein light ben ...
... What does micro-arcsecond mean? • Precision: 50pico-rad, human hair at 1000km, coin on the moon • Astrometry needs more than signal to noise and image processing • One must have a physical model and understanding of every contribution to the error budget at an appropriate level • Einstein light ben ...
PDF
... 10−11 ergs s−1 cm−2 and F0.1−2.4 keV = 4.1 × 10−9 ergs s−1 cm−2 . The distance to 1E 2259+586 has been estimated to be d = 3.6 − 5.6 kpc from the supernova surface brightness-distance (Σ-D) relationship (Gregory & Fahlman 1980; Sofue, Takahara, & Hirabayashi 1983; Hughes et al. 1984). While there is ...
... 10−11 ergs s−1 cm−2 and F0.1−2.4 keV = 4.1 × 10−9 ergs s−1 cm−2 . The distance to 1E 2259+586 has been estimated to be d = 3.6 − 5.6 kpc from the supernova surface brightness-distance (Σ-D) relationship (Gregory & Fahlman 1980; Sofue, Takahara, & Hirabayashi 1983; Hughes et al. 1984). While there is ...
Article PDF - IOPscience
... fact that they have line densities q 1014 cm1, 6 orders of magnitude larger than the Arecibo or AMOR meteoroids traveling at the same velocity. These larger meteoroids are still much smaller than the mean free path, so that aerodynamic effects seem unlikely to explain the difference; nevertheless ...
... fact that they have line densities q 1014 cm1, 6 orders of magnitude larger than the Arecibo or AMOR meteoroids traveling at the same velocity. These larger meteoroids are still much smaller than the mean free path, so that aerodynamic effects seem unlikely to explain the difference; nevertheless ...
Andromeda *ruler of men*
... monster Cetus. Upon his return to Greece from slain the Gorgon Medusa Perseus (son of Zeus) noticed the princess chained to a rock on the shoreline. When Perseus saw the princess it was love at first sight. He promised to kill the sea monster and rescue the girl. In return he asked the king and quee ...
... monster Cetus. Upon his return to Greece from slain the Gorgon Medusa Perseus (son of Zeus) noticed the princess chained to a rock on the shoreline. When Perseus saw the princess it was love at first sight. He promised to kill the sea monster and rescue the girl. In return he asked the king and quee ...
The Corn Burned by Syrius
... entropy considered below. The retention in the title of the variant, though historically legitimate, spelling of the star’s name – philologically associating it with an identifiable translation of the Consolation – acts as a consequential link to the classical model of divine stellar influence from ...
... entropy considered below. The retention in the title of the variant, though historically legitimate, spelling of the star’s name – philologically associating it with an identifiable translation of the Consolation – acts as a consequential link to the classical model of divine stellar influence from ...
1 Introduction - Wiley-VCH
... models of galaxy formation and evolution. Because of their tightness, they are also powerful distance tracers generally used to study the large scale galaxy distribution within the universe. Clearly, a coherent and complete understanding of galaxy evolution through cosmic time requires a simultaneou ...
... models of galaxy formation and evolution. Because of their tightness, they are also powerful distance tracers generally used to study the large scale galaxy distribution within the universe. Clearly, a coherent and complete understanding of galaxy evolution through cosmic time requires a simultaneou ...
Chapter 1 The Discovery of Open Clusters - Willmann-Bell
... Very compressed, rich clusters of stars Compressed clusters of small and large stars Coarsely scattered clusters of stars. Although now long superseded, the Herschel designations which resulted from this classification system proved sufficiently useful that they were often used by amateur astronomer ...
... Very compressed, rich clusters of stars Compressed clusters of small and large stars Coarsely scattered clusters of stars. Although now long superseded, the Herschel designations which resulted from this classification system proved sufficiently useful that they were often used by amateur astronomer ...
View the sky`s greatest nebula
... but you need a dark sky to see it with unaided eyes. The winter sky is the brightest of the seasonal skies — it contains the highest concentration of bright stars — and its most famous representative is Orion. Although the background sky is fainter here than in summer, this area still contains much ...
... but you need a dark sky to see it with unaided eyes. The winter sky is the brightest of the seasonal skies — it contains the highest concentration of bright stars — and its most famous representative is Orion. Although the background sky is fainter here than in summer, this area still contains much ...
R136a1
RMC 136a1 (usually abbreviated to R136a1) is a Wolf-Rayet star located at the center of R136, the central condensation of stars of the large NGC 2070 open cluster in the Tarantula Nebula. It lies at a distance of about 50 kiloparsecs (163,000 light-years) in the Large Magellanic Cloud. It has the highest mass and luminosity of any known star, at 265 M☉ and 8.7 million L☉, and also one of the hottest at over 50,000 K.