Trapezium Fracture
... glimpsing a vision of our own Sun and solar system’s creation 4.5 billion years ago. Current theory holds that our own Solar system was created out of a similar massive nebula. Within M42 are thousands of protostars and young stars, less than one million years old. Will one of these stars in a far d ...
... glimpsing a vision of our own Sun and solar system’s creation 4.5 billion years ago. Current theory holds that our own Solar system was created out of a similar massive nebula. Within M42 are thousands of protostars and young stars, less than one million years old. Will one of these stars in a far d ...
Annual Report 2006/2007
... when the Universe was less than 5% of its present age. The theme of the NOVA Program is to unravel the history of the universe and to further develop the understanding of the life cycle of stars and galaxies. The NOVA research program concentrates on the following three interconnected areas: • Netw ...
... when the Universe was less than 5% of its present age. The theme of the NOVA Program is to unravel the history of the universe and to further develop the understanding of the life cycle of stars and galaxies. The NOVA research program concentrates on the following three interconnected areas: • Netw ...
Multi-Wavelength Observations of Known, and Searches
... Improved point spread function. Atwood et al. (2013) 4th Fermi Symposium : Monterey, CA : 28 Oct-2 Nov 2012 ...
... Improved point spread function. Atwood et al. (2013) 4th Fermi Symposium : Monterey, CA : 28 Oct-2 Nov 2012 ...
Extrasolar Kuiper Belt Dust Disks
... tary systems: By 1983, a decade before extrasolar planets were discovered, IRAS observations proved that there is planetary material surrounding nearby stars (Aumann et al., ...
... tary systems: By 1983, a decade before extrasolar planets were discovered, IRAS observations proved that there is planetary material surrounding nearby stars (Aumann et al., ...
Unlocking the secrets of stellar haloes using combined star counts
... The stellar haloes of galaxies contain the fossil record of galaxy assembly, and observations of resolved halo stars in the Milky Way, Andromeda and other nearby galaxies (e.g. Mouhcine et al. 2005; Ibata et al. 2007; Helmi 2008; Rejkuba, Mouchine & Ibata 2009; Durrell, Sarajedini & Chandar 2010; Ta ...
... The stellar haloes of galaxies contain the fossil record of galaxy assembly, and observations of resolved halo stars in the Milky Way, Andromeda and other nearby galaxies (e.g. Mouhcine et al. 2005; Ibata et al. 2007; Helmi 2008; Rejkuba, Mouchine & Ibata 2009; Durrell, Sarajedini & Chandar 2010; Ta ...
The ages of pre-main-sequence stars
... models in this range. We describe our models in detail in the following sections, but note that, because we use very similar physics, they do not differ greatly from those of D'Antona & Mazzitelli. However, stars do continue to accrete long after their photospheres are exposed, and they can be place ...
... models in this range. We describe our models in detail in the following sections, but note that, because we use very similar physics, they do not differ greatly from those of D'Antona & Mazzitelli. However, stars do continue to accrete long after their photospheres are exposed, and they can be place ...
Deep SDSS optical spectroscopy of distant halo stars I. Atmospheric
... and Paschen) lines, Ca II lines (H and K in the blue, as well as the IR triplet). Our continuum correction scheme splits the spectral range into 20 equal-velocity bins and divides each by its mean value. This approach removes large-scale systematic errors in flux, preserves some of the local informa ...
... and Paschen) lines, Ca II lines (H and K in the blue, as well as the IR triplet). Our continuum correction scheme splits the spectral range into 20 equal-velocity bins and divides each by its mean value. This approach removes large-scale systematic errors in flux, preserves some of the local informa ...
Chemical composition of 90 F and G disk dwarfs
... stars in our sample have errors larger than 10%. From these accurate parallaxes, stellar distances and absolute magnitudes were obtained. Note, however, that our sample includes some binaries, for which the absolute magnitude from the Hipparcos parallax could be significantly in error. An offset of ...
... stars in our sample have errors larger than 10%. From these accurate parallaxes, stellar distances and absolute magnitudes were obtained. Note, however, that our sample includes some binaries, for which the absolute magnitude from the Hipparcos parallax could be significantly in error. An offset of ...
Stellar Lifetimes
... by striking a balance between the gravity of their enormous mass and the pressure produced by the energy of fusion reactions. A main sequence star is in equilibrium as Hydrogen burning supports it against gravitational collapse. What happens as the hydrogen runs out? © 2007 Pearson Education Inc., p ...
... by striking a balance between the gravity of their enormous mass and the pressure produced by the energy of fusion reactions. A main sequence star is in equilibrium as Hydrogen burning supports it against gravitational collapse. What happens as the hydrogen runs out? © 2007 Pearson Education Inc., p ...
Proposal - ESA Science
... one must investigate and characterise extra-Solar planets. Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of these exoplanets remai ...
... one must investigate and characterise extra-Solar planets. Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of these exoplanets remai ...
Early-type stars in the core of the young open cluster Westerlund 2
... cluster displays significant photometric variability above 1% at the 1-σ level. The twelve brightest O-type stars are found to have spectral types between O3 and O6.5, significantly earlier than previously thought. Conclusions. The distance of the early-type stars in Westerlund 2 is established to b ...
... cluster displays significant photometric variability above 1% at the 1-σ level. The twelve brightest O-type stars are found to have spectral types between O3 and O6.5, significantly earlier than previously thought. Conclusions. The distance of the early-type stars in Westerlund 2 is established to b ...
Comparative study of two solar eclipses in the 21st century
... Solar eclipses have been seen as incredible events since thousands of years ago. Anyway, they have also been considered terrifying because our ancestors couldn’t understand why the sun disappeared for some hours. For that reason, it was understandable to consider that their gods were sending them a ...
... Solar eclipses have been seen as incredible events since thousands of years ago. Anyway, they have also been considered terrifying because our ancestors couldn’t understand why the sun disappeared for some hours. For that reason, it was understandable to consider that their gods were sending them a ...
The first photometric analysis of the overcontact binary MQ UMa with
... cool short-period binary merging. In this paper, we focus on the high fill-out, low mass ratio overcontact binaries which are at the late evolutionary stages of the contact configuration. Photometric analysis and orbital period studies of them will provide important information for the evolution and ...
... cool short-period binary merging. In this paper, we focus on the high fill-out, low mass ratio overcontact binaries which are at the late evolutionary stages of the contact configuration. Photometric analysis and orbital period studies of them will provide important information for the evolution and ...
Properties of Galactic early-type O
... avoided contamination by the “worm” artifact (Sahnow et al. 2000) by using only the LiF2A spectra on the long-wavelength side (λλ1086-1183 Å) of the spectrum. Finally, the co-added merged spectra were smoothed to a resolution of 30 km s−1 to enhance the signal-to-noise ratio. For HD 66811, we used t ...
... avoided contamination by the “worm” artifact (Sahnow et al. 2000) by using only the LiF2A spectra on the long-wavelength side (λλ1086-1183 Å) of the spectrum. Finally, the co-added merged spectra were smoothed to a resolution of 30 km s−1 to enhance the signal-to-noise ratio. For HD 66811, we used t ...
Aalborg Universitet Spacecraft Attitude Determination with Earth Albedo Corrected Sun Sensor Measurements
... attitude determination. Since the recent development of the CubeSat pico-satellite concept, numerous universities have initiated student satellite projects. The minimal size of the CubeSats limits the hardware configuration, which, for an attitude determination point-of-view, only allows simple atti ...
... attitude determination. Since the recent development of the CubeSat pico-satellite concept, numerous universities have initiated student satellite projects. The minimal size of the CubeSats limits the hardware configuration, which, for an attitude determination point-of-view, only allows simple atti ...
- Spiral - Imperial College London
... et al. 2011), the surface magnetic field is currently believed to be the main source of the solar irradiance variability over time scales ranging from days to decades and centuries (Domingo et al. 2009; Ermolli et al. 2013; Solanki et al. 2013). Modern models (e.g. Lean et al. 2005; Krivova & Solank ...
... et al. 2011), the surface magnetic field is currently believed to be the main source of the solar irradiance variability over time scales ranging from days to decades and centuries (Domingo et al. 2009; Ermolli et al. 2013; Solanki et al. 2013). Modern models (e.g. Lean et al. 2005; Krivova & Solank ...
pvb-based star compositions
... a different shade, you might want to alter the relative proportions of calcium carbonate and cryolite. The compositions listed in Table 2 are reasonable, but not particularly exceptional. The blue is one—based on a Chinese formulation—that was suggested by Tom Schroeder; it gives a reasonable colour ...
... a different shade, you might want to alter the relative proportions of calcium carbonate and cryolite. The compositions listed in Table 2 are reasonable, but not particularly exceptional. The blue is one—based on a Chinese formulation—that was suggested by Tom Schroeder; it gives a reasonable colour ...
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 ...
Chapter 13. Newton`s Theory of Gravity
... A Little History Kepler’s laws, as we call them today, state that 1. Planets move in elliptical orbits, with the sun at one focus of the ellipse. 2. A line drawn between the sun and a planet sweeps out equal areas during equal intervals of time. 3. The square of a planet’s orbital period is proport ...
... A Little History Kepler’s laws, as we call them today, state that 1. Planets move in elliptical orbits, with the sun at one focus of the ellipse. 2. A line drawn between the sun and a planet sweeps out equal areas during equal intervals of time. 3. The square of a planet’s orbital period is proport ...
Pyramid of Cheops and its Secret I
... a bow. In this way they eventually arrived at the location where the pyramid was being built.” The”magic staffs” used by the ancient scientists were cut into lengths exactly corresponding to the required wavelength frequency. In other words: they found out the exact frequency of the block of stone a ...
... a bow. In this way they eventually arrived at the location where the pyramid was being built.” The”magic staffs” used by the ancient scientists were cut into lengths exactly corresponding to the required wavelength frequency. In other words: they found out the exact frequency of the block of stone a ...
Phy Pre 08 - PembyPhysics
... The graph shown above illustrates the results found from an experiment that measured the current passing through a resistor when various voltages were applied across the resistor. The resistor was placed in a water bath to ensure that the temperature of the resistor did not change throughout the exp ...
... The graph shown above illustrates the results found from an experiment that measured the current passing through a resistor when various voltages were applied across the resistor. The resistor was placed in a water bath to ensure that the temperature of the resistor did not change throughout the exp ...
GEK 1506 Heavenly Mathematics: Cultural Astronomy
... to sunset. These, however, were temporal hours and not of equal length. The dial of Berosus remained in use for centuries since its invention in the fourth century. The Romans was later introduced to the sundial by the Greeks and made changes to it. The dial was designed to divide the period of day ...
... to sunset. These, however, were temporal hours and not of equal length. The dial of Berosus remained in use for centuries since its invention in the fourth century. The Romans was later introduced to the sundial by the Greeks and made changes to it. The dial was designed to divide the period of day ...
- National Optical Astronomy Observatory
... magnetic field lines unless there was an indirect mechanism for their flow, namely, other materials that are directed by the magnetic field. The data seems to indicate that the mechanism for the nickel’s movement is not the flow of iron directed by the magnetic fields. The nickel displays greater va ...
... magnetic field lines unless there was an indirect mechanism for their flow, namely, other materials that are directed by the magnetic field. The data seems to indicate that the mechanism for the nickel’s movement is not the flow of iron directed by the magnetic fields. The nickel displays greater va ...
Stars, Galaxies, and Beyond
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...