Publications 2003 - Département d`Astrophysique, Géophysique et
... eccentric orbit (e=0.81) and similar component masses with a mass ratio M1/M2=1.02. Cen forms a challenge for current evolution scenarios in close binaries and it is also a puzzle how a massive binary with such a large eccentricity could have formed in the first place. Both the primary and the seco ...
... eccentric orbit (e=0.81) and similar component masses with a mass ratio M1/M2=1.02. Cen forms a challenge for current evolution scenarios in close binaries and it is also a puzzle how a massive binary with such a large eccentricity could have formed in the first place. Both the primary and the seco ...
New Double Stars from Asteroidal Occultations, 1971 - 2008
... Asteroids and planetary moons will naturally occult many stars as they move through the sky. The biggest challenge in observing such occultations is to accurately predict the time of the occultation event and the location of the shadow path as it crosses the Earth. Since the Hipparcos mission, and t ...
... Asteroids and planetary moons will naturally occult many stars as they move through the sky. The biggest challenge in observing such occultations is to accurately predict the time of the occultation event and the location of the shadow path as it crosses the Earth. Since the Hipparcos mission, and t ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... streak of light dash across the sky like a cosmic laser beam, lasting no more than a second or so. This is a meteor, popularly termed a shooting star. Do not misidentify shooting stars with satellites or high-flying aeroplanes, which look like moving stars but drift at a more leisurely pace. Despite ...
... streak of light dash across the sky like a cosmic laser beam, lasting no more than a second or so. This is a meteor, popularly termed a shooting star. Do not misidentify shooting stars with satellites or high-flying aeroplanes, which look like moving stars but drift at a more leisurely pace. Despite ...
PDF - Department of Statistics
... outliers. Let Yksh denote the resulting test statistic for hold h of star s on telescope k. We now describe a test based on measurements at multiple telescopes which flags a star-hold if Yksh is sufficiently small at each telescope, based on the set of preliminary observations. Suppose the desired f ...
... outliers. Let Yksh denote the resulting test statistic for hold h of star s on telescope k. We now describe a test based on measurements at multiple telescopes which flags a star-hold if Yksh is sufficiently small at each telescope, based on the set of preliminary observations. Suppose the desired f ...
Observing Stellar Evolution
... Stellar evolution – refers to the stages in the lifetime of one star. When biologists talk about evolution they mean intergenerational evolution. While stars change from one generation to the next, the focus of this program is stellar lifetimes. Burning – The materials that comprise stars do not 'bu ...
... Stellar evolution – refers to the stages in the lifetime of one star. When biologists talk about evolution they mean intergenerational evolution. While stars change from one generation to the next, the focus of this program is stellar lifetimes. Burning – The materials that comprise stars do not 'bu ...
Lab 7
... Introduction: By looking at an apparently flat background of stars at night or at a star chart printed on a page, we often forget about the three-dimensional nature of the universe. In this exercise, you will construct (with welding rods and Styrofoam balls) a model of nearby space including many of ...
... Introduction: By looking at an apparently flat background of stars at night or at a star chart printed on a page, we often forget about the three-dimensional nature of the universe. In this exercise, you will construct (with welding rods and Styrofoam balls) a model of nearby space including many of ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
... From our earliest texts onwards, we find classical authors referring to the time of year by means of the rising and setting of various stars and constellations. Hesiod encourages us to begin the harvest at the rising of the Pleiades, and to plough at their setting; Alcaeus encourages us to drink at ...
... From our earliest texts onwards, we find classical authors referring to the time of year by means of the rising and setting of various stars and constellations. Hesiod encourages us to begin the harvest at the rising of the Pleiades, and to plough at their setting; Alcaeus encourages us to drink at ...
mufon ufo symposium -1974
... sequence stars in the best range for life in a 10 parsec radius of Earth were probably variable, although I could find no reason why the percentage is so high. The ratio dropped to 1/20 in the 10 to 20 parsec range, so we probably are not catching the variability in these stars. If the star is varia ...
... sequence stars in the best range for life in a 10 parsec radius of Earth were probably variable, although I could find no reason why the percentage is so high. The ratio dropped to 1/20 in the 10 to 20 parsec range, so we probably are not catching the variability in these stars. If the star is varia ...
Determination of kinetic energies of stars using Hipparcos data *
... constituent in proper motions has a peculiar or random nature. A drastic change in residual spatial velocity can be observed when crossing from the F to G spectrum. The modification of kinematic characteristics within this spectral range was observed long time ago by Parenago (Parenago P.P. 1954). ...
... constituent in proper motions has a peculiar or random nature. A drastic change in residual spatial velocity can be observed when crossing from the F to G spectrum. The modification of kinematic characteristics within this spectral range was observed long time ago by Parenago (Parenago P.P. 1954). ...
1 Introduction - University of Amsterdam
... role of massive stars in our universe – it is pivotal to understand the formation and evolution of massive stars. Perhaps surprisingly so, little is known about these processes. The formation of massive stars – rare events in the present-day universe – takes place deep inside dusty interstellar clou ...
... role of massive stars in our universe – it is pivotal to understand the formation and evolution of massive stars. Perhaps surprisingly so, little is known about these processes. The formation of massive stars – rare events in the present-day universe – takes place deep inside dusty interstellar clou ...
The star formation histories of two northern LMC fields
... and Fig. 6. Average star formation rates for each era are given assuming a Salpeter initial mass function (IMF) with cut-offs at 120 and 0.1 M(, which is consistent with the Holtzman et al. (1997) results. An IMF error would simply have the result of changing the ratio of old to young stars, but wou ...
... and Fig. 6. Average star formation rates for each era are given assuming a Salpeter initial mass function (IMF) with cut-offs at 120 and 0.1 M(, which is consistent with the Holtzman et al. (1997) results. An IMF error would simply have the result of changing the ratio of old to young stars, but wou ...
Test Ch. 27 Multiple Choice Identify the choice that best completes
... 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s outer shell to ...
... 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s outer shell to ...
An introduction to photometry and photometric measurements Henry
... "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This means, for example, that a photograph of the Sun would expose the film equally across the Sun's disk. It also turns out that the exposure would ...
... "brightness" of the Sun appears to be about the same over most of the Sun's surface, which looks like a nearly uniform disk even though it is a sphere. This means, for example, that a photograph of the Sun would expose the film equally across the Sun's disk. It also turns out that the exposure would ...
May 2017 Astronomy Calendar by Dave Mitsky
... June 2017 Astronomy Calendar by Dave Mitsky Some information supplied and/or added by Tony Donnangelo ...
... June 2017 Astronomy Calendar by Dave Mitsky Some information supplied and/or added by Tony Donnangelo ...
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.