Astronomical Picture of the Day
... Elliptical galaxies are unlike spiral galaxies and hence unlike our own Milky Way Galaxy. The giant elliptical galaxy named NGC 4881 on the upper left lies at the edge of the giant Coma Cluster of Galaxies. Elliptical galaxies are ellipsoidal in shape, contain no spiral arms, contain little interste ...
... Elliptical galaxies are unlike spiral galaxies and hence unlike our own Milky Way Galaxy. The giant elliptical galaxy named NGC 4881 on the upper left lies at the edge of the giant Coma Cluster of Galaxies. Elliptical galaxies are ellipsoidal in shape, contain no spiral arms, contain little interste ...
FOE 2017 Poster Contributions - College of Science | Oregon State
... Abstract: DeWe propose an alternative technique based on the semi-parametric generalized additive model, GAM (Hastie & Tibshirani 1986). GAM allows to represent the relationship as the sum of smooth functions including very few predictors and to identify these components of the model which can be re ...
... Abstract: DeWe propose an alternative technique based on the semi-parametric generalized additive model, GAM (Hastie & Tibshirani 1986). GAM allows to represent the relationship as the sum of smooth functions including very few predictors and to identify these components of the model which can be re ...
Presolar Cloud Collapse and the Formation and Early Evolution of
... motions develop and soon result in the formation of an optically thick first core, with a size on the order of 10 AU. This central core is supported primarily by the thermal pressure of the molecular hydrogen gas, while the remainder of the cloud continues to fall onto the core. For a 1 M cloud, thi ...
... motions develop and soon result in the formation of an optically thick first core, with a size on the order of 10 AU. This central core is supported primarily by the thermal pressure of the molecular hydrogen gas, while the remainder of the cloud continues to fall onto the core. For a 1 M cloud, thi ...
Planetary Nebulae: Observational Properties, Mimics, and Diagnostics
... low-mass nova shells and high-mass circumstellar shells around massive Population I stars. Recent observations have shown that the ionized mass of some symbiotic outflows approaches 0.1 M⊙ , so there is substantial overlap between the classes (see Santander-Garcia et al. 2008). • An electron density ...
... low-mass nova shells and high-mass circumstellar shells around massive Population I stars. Recent observations have shown that the ionized mass of some symbiotic outflows approaches 0.1 M⊙ , so there is substantial overlap between the classes (see Santander-Garcia et al. 2008). • An electron density ...
The Life and Work of Edward Emerson Barnard
... 'not been well' for some time, as he told Wesley,71 had not refrained from his usual demanding observing schedule, but now he became seriously ill just as these phenomena were passing through another critical phase - the Earth was due to make its final passage through the ring-plane on January 7,190 ...
... 'not been well' for some time, as he told Wesley,71 had not refrained from his usual demanding observing schedule, but now he became seriously ill just as these phenomena were passing through another critical phase - the Earth was due to make its final passage through the ring-plane on January 7,190 ...
1. The Birth of a Star
... toward a faint colored cloud in space named “M42”. Notice that in the same info display, the distance from you to that cloud is listed as 1,177.7 ly. The “ly” stands for “Light Year”. It is not a time, but a distance. It is the distance a beam of light will travel through space in one year. 13. Ligh ...
... toward a faint colored cloud in space named “M42”. Notice that in the same info display, the distance from you to that cloud is listed as 1,177.7 ly. The “ly” stands for “Light Year”. It is not a time, but a distance. It is the distance a beam of light will travel through space in one year. 13. Ligh ...
The Physics and Chemistry of Nebular Evolution
... time, and ready access of all chemical species to one another. These studies have been applied to infer the conditions present at the location in the solar nebula where and when a given meteorite, or its components, formed. While condensation calculations act as a guide for the chemical evolution of ...
... time, and ready access of all chemical species to one another. These studies have been applied to infer the conditions present at the location in the solar nebula where and when a given meteorite, or its components, formed. While condensation calculations act as a guide for the chemical evolution of ...
SPATIAL STUDY WITH THE VERY LARGE TELESCOPE OF A NEW
... (300 AU at 140 pc) and a width of 1>2 (170 AU at 140 pc). Thanks to its location at the periphery of the dense cores, it suffers small foreground visual extinction (AV ¼ 2:1 2:6 mag). Although this disk is seen close to edge-on, the two reflection nebulae display very different colors. We introduce a ...
... (300 AU at 140 pc) and a width of 1>2 (170 AU at 140 pc). Thanks to its location at the periphery of the dense cores, it suffers small foreground visual extinction (AV ¼ 2:1 2:6 mag). Although this disk is seen close to edge-on, the two reflection nebulae display very different colors. We introduce a ...
Type II SuperNova - University of Dayton
... core of the star collapses catastrophically in a time of only a few thousandths of a second. This collapse leads to an explosion called a Type II Supernova that blows off the outer layers of the star and produces a prodigious light show that can rival the luminosity of an entire galaxy (billions of ...
... core of the star collapses catastrophically in a time of only a few thousandths of a second. This collapse leads to an explosion called a Type II Supernova that blows off the outer layers of the star and produces a prodigious light show that can rival the luminosity of an entire galaxy (billions of ...
Star Formation in the Rosette Complex
... The pioneering observations by Gosachinskii & Khersonskii (1982) of the HI emission at 21 cm made with the RATAN-600 telescope revealed that the Rosette Complex and the Monoceros Loop were enclosed in a thin HI envelope 130 pc in diameter, possibly expanding at 20 km·s−1 , suggesting that the supern ...
... The pioneering observations by Gosachinskii & Khersonskii (1982) of the HI emission at 21 cm made with the RATAN-600 telescope revealed that the Rosette Complex and the Monoceros Loop were enclosed in a thin HI envelope 130 pc in diameter, possibly expanding at 20 km·s−1 , suggesting that the supern ...
... Question-Answer Book. Do not write in the margins. Answers written in the margins will not be marked. Supplementary answer sheets will be provided on request. Write your Candidate Number, mark the question number box and stick a barcode label on each sheet. Tie them loosely but securely with a ...
to - NexStar Resource Site
... 9) Jupiter The king of our Solar System of planets. It is believed that with a little more mass, Jupiter could have become a small star. What a different place our Earth would be with 2 Suns. Jupiter orbits 778,330,000 km (5.20 AU) from the Sun. Its mass is about 318 times that of the Earth and cont ...
... 9) Jupiter The king of our Solar System of planets. It is believed that with a little more mass, Jupiter could have become a small star. What a different place our Earth would be with 2 Suns. Jupiter orbits 778,330,000 km (5.20 AU) from the Sun. Its mass is about 318 times that of the Earth and cont ...
Origin and loss of nebula-captured hydrogen envelopes from `sub`
... longer wavelengths and provided a code which calculates full spectra from X-rays to the infrared (IR) for a range of stellar ages. Using their model, we calculate solar fluxes in several wavelength bands back to an age of 0.1 Gyr, which corresponds approximately to the end of the saturation period f ...
... longer wavelengths and provided a code which calculates full spectra from X-rays to the infrared (IR) for a range of stellar ages. Using their model, we calculate solar fluxes in several wavelength bands back to an age of 0.1 Gyr, which corresponds approximately to the end of the saturation period f ...
My Constellation
... equivalent: Praesepe, which not only means a hive but also a crib, or manger. This is a bright open cluster clearly visible to the naked eye on a dark enough night, and best appreciated with binoculars or small scope. One of the largest clusters, its 1.5 degree size is equivalent to three full moons ...
... equivalent: Praesepe, which not only means a hive but also a crib, or manger. This is a bright open cluster clearly visible to the naked eye on a dark enough night, and best appreciated with binoculars or small scope. One of the largest clusters, its 1.5 degree size is equivalent to three full moons ...
Chapter 7 Formation of metal-enriched 2nd generation objects 7.1
... identical cosmological parameters, initialization strategy, and spatial and mass resolution. In this calculation we use the ZEUS hydro method (Section 2.2.3) instead of the PPM method (Section 2.2.2) because it is more stable in situations where the overall pressure jump between adjacent cells is e ...
... identical cosmological parameters, initialization strategy, and spatial and mass resolution. In this calculation we use the ZEUS hydro method (Section 2.2.3) instead of the PPM method (Section 2.2.2) because it is more stable in situations where the overall pressure jump between adjacent cells is e ...
Lecture 12: Evolution of the Galaxy
... • Further heavy elements may be formed during the explosion in high temperature shock waves • The ejecta intially travel out at about 10,000 km/s and eventually become well mixed with the surrounding ISM • Ejecta sweep up neutral H in a snow-plough action over some 105 years before the expansion dis ...
... • Further heavy elements may be formed during the explosion in high temperature shock waves • The ejecta intially travel out at about 10,000 km/s and eventually become well mixed with the surrounding ISM • Ejecta sweep up neutral H in a snow-plough action over some 105 years before the expansion dis ...
Cepheid
... In Shapley’s day, the LMC and SMC were considered as two isolated offshoots of the Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
... In Shapley’s day, the LMC and SMC were considered as two isolated offshoots of the Milky Way, different from the spiral nebulae. We now realize that they are ‘dwarf’ galaxies in their own right (but not spirals). ...
PPT
... detected X-ray photon Energy range 0.15 – 15 keV Survey profits from archive observations of individual interesting objects (O stars, outburst T Tauri stars) and calibration observations ...
... detected X-ray photon Energy range 0.15 – 15 keV Survey profits from archive observations of individual interesting objects (O stars, outburst T Tauri stars) and calibration observations ...
Slide 1
... Vela pulsar (P=89 millisec) have been detected at radio, IR , optical, X-ray and -ray wavelengths. Other pulsars tend to be only radio emitters. Over 500 pulsars are now known and all of them are in our Galaxy except for one in the Large Magellanic Cloud and one in the Small Magellanic Cloud. On sh ...
... Vela pulsar (P=89 millisec) have been detected at radio, IR , optical, X-ray and -ray wavelengths. Other pulsars tend to be only radio emitters. Over 500 pulsars are now known and all of them are in our Galaxy except for one in the Large Magellanic Cloud and one in the Small Magellanic Cloud. On sh ...
The ISO–SWS Spectrum of Planetary Nebula NGC 7027
... C HAPTER 2: The ISO–SWS Spectrum of Planetary Nebula NGC 7027 ...
... C HAPTER 2: The ISO–SWS Spectrum of Planetary Nebula NGC 7027 ...
UCLA 2004
... 1. AGB stars do produce 41Ca, 36Cl, 26Al, 60Fe, 107Pd, 135Cs and 205Pb [Wasserburg et al. 1994, 1995, 1996, 1998; Gallino et al. 1998, 2004]. But they do not produce 129I, 53Mn, or 182Hf. 2. AGB stars are extremely unlikely to be associated with the early Solar System. Kastner & Myers (1994) conserv ...
... 1. AGB stars do produce 41Ca, 36Cl, 26Al, 60Fe, 107Pd, 135Cs and 205Pb [Wasserburg et al. 1994, 1995, 1996, 1998; Gallino et al. 1998, 2004]. But they do not produce 129I, 53Mn, or 182Hf. 2. AGB stars are extremely unlikely to be associated with the early Solar System. Kastner & Myers (1994) conserv ...
Explosive sources of the highest energy radiation
... During this period the average >100 MeV flux nova explosion reported by Chinese astronoof the system was 0.9 × 10 –10 erg cm –2 s –1. What mers in AD 1054. At the heart of the nebula is was completely unexpected was that 30 days a pulsar that loses rotational energy through a after periastron passag ...
... During this period the average >100 MeV flux nova explosion reported by Chinese astronoof the system was 0.9 × 10 –10 erg cm –2 s –1. What mers in AD 1054. At the heart of the nebula is was completely unexpected was that 30 days a pulsar that loses rotational energy through a after periastron passag ...
Estimating the Age of Supernova Remnants - Chandra X
... What is the rate of expansion of Cas A? The average amount of energy released in a core collapse supernova event is ~1044 Joules, and approximately one quarter of the energy drives the expansion of the remnant. Although the initial collapse and rebound of the core ejects the outer layers of the star ...
... What is the rate of expansion of Cas A? The average amount of energy released in a core collapse supernova event is ~1044 Joules, and approximately one quarter of the energy drives the expansion of the remnant. Although the initial collapse and rebound of the core ejects the outer layers of the star ...
Millisecond Pulsar Binaries at Transition
... •Basically the same as PSR J1023+0038 •After the transition: • a P=1.69 ms pulsar is seen •X-rays are orbitally modulated •Gamma-ray flux has decreased by a factor of 2 ...
... •Basically the same as PSR J1023+0038 •After the transition: • a P=1.69 ms pulsar is seen •X-rays are orbitally modulated •Gamma-ray flux has decreased by a factor of 2 ...
Crab Nebula
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. It is not, as its name might suggest, in Cancer. The now-current name is due to William Parsons, 3rd Earl of Rosse, who observed the object in 1840 using a 36-inch telescope and produced a drawing that looked somewhat like a crab. Corresponding to a bright supernova recorded by Chinese astronomers in 1054, the nebula was observed later by English astronomer John Bevis in 1731. The nebula was the first astronomical object identified with a historical supernova explosion.At an apparent magnitude of 8.4, comparable to that of Saturn's moon Titan, it is not visible to the naked eye but can be made out using binoculars under favourable conditions. The nebula lies in the Perseus Arm of the Milky Way galaxy, at a distance of about 2.0 kiloparsecs (6,500 ly) from Earth. It has a diameter of 3.4 parsecs (11 ly), corresponding to an apparent diameter of some 7 arcminutes, and is expanding at a rate of about 1,500 kilometres per second (930 mi/s), or 0.5% c.At the center of the nebula lies the Crab Pulsar, a neutron star 28–30 kilometres (17–19 mi) across with a spin rate of 30.2 times per second, which emits pulses of radiation from gamma rays to radio waves. At X-ray and gamma ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 10 TeV. The nebula's radiation allows for the detailed studying of celestial bodies that occult it. In the 1950s and 1960s, the Sun's corona was mapped from observations of the Crab's radio waves passing through it, and in 2003, the thickness of the atmosphere of Saturn's moon Titan was measured as it blocked out X-rays from the nebula.