The Birth of a Supernova Seen in Real Time
... lower than those of typical GRB afterglows, but comparable to the radio luminosities observed for nearby core-collapse SNe. Based on our modeling of the temporal and spectral evolution of the radio emission, we firmly constrain the velocity of the fastest ejecta to be just υ =0.25c with a kinetic en ...
... lower than those of typical GRB afterglows, but comparable to the radio luminosities observed for nearby core-collapse SNe. Based on our modeling of the temporal and spectral evolution of the radio emission, we firmly constrain the velocity of the fastest ejecta to be just υ =0.25c with a kinetic en ...
Kinetic equilibrium of iron in the atmospheres of cool stars
... et al. (1996) and Gratton et al. (1996). Table 2 confronts the corresponding numbers in detail. Only HD 140283 displays a markedly lower temperature in the Alonso et al. calibration. This is, at least in part, due to the zero-reddening assumption adopted by these authors. A discussion of this point ...
... et al. (1996) and Gratton et al. (1996). Table 2 confronts the corresponding numbers in detail. Only HD 140283 displays a markedly lower temperature in the Alonso et al. calibration. This is, at least in part, due to the zero-reddening assumption adopted by these authors. A discussion of this point ...
Astronomers` Observing Guides
... Double and Multiple Stars Defined We begin this volume on viewing double and multiple stars by defining just what they are: two or more suns placed in close proximity to each other in the sky as seen with the unaided eye, binoculars or telescopes. With the exception of stars that just happen to lie al ...
... Double and Multiple Stars Defined We begin this volume on viewing double and multiple stars by defining just what they are: two or more suns placed in close proximity to each other in the sky as seen with the unaided eye, binoculars or telescopes. With the exception of stars that just happen to lie al ...
The Witness of the Stars
... Word (the thing spoken, sayings) of God," He asks, "But I say, Have they not heard? Yes, verily." And we may ask, How have they heard? The answer follows--"Their sound went into all the earth and their words (their teaching, message, instruction) unto the ends of the world." What words? What instruc ...
... Word (the thing spoken, sayings) of God," He asks, "But I say, Have they not heard? Yes, verily." And we may ask, How have they heard? The answer follows--"Their sound went into all the earth and their words (their teaching, message, instruction) unto the ends of the world." What words? What instruc ...
Selected observation targets at a glance per constellation
... α Caeli, Alpha Caeli, F-type main-sequence star: suspected Delta Scuti type variable: exhibiting variations in luminosity as a result of both radial and non-radial pulsations on its surface + a red dwarf spectral class M, also a variable, UV Ceti type (flare star): occasionally undergoes sudden extr ...
... α Caeli, Alpha Caeli, F-type main-sequence star: suspected Delta Scuti type variable: exhibiting variations in luminosity as a result of both radial and non-radial pulsations on its surface + a red dwarf spectral class M, also a variable, UV Ceti type (flare star): occasionally undergoes sudden extr ...
{2.} and {4.}
... Constellations are the way that many learn about the sky and help as a memory aid to the stars that form the figures, the constellations did organize this endless wonder, our sky. As scientist looked longer at our sky they categorized stars and found that they could predict their movement, making an ...
... Constellations are the way that many learn about the sky and help as a memory aid to the stars that form the figures, the constellations did organize this endless wonder, our sky. As scientist looked longer at our sky they categorized stars and found that they could predict their movement, making an ...
The Search for Extrasolar Earth-like Planets
... Peg b (named after its parent star 51 Peg A, the 51st brightest star in the constellation Pegasus), is a giant planet with a very short period (4 days) and a correspondingly tiny semi -major axis (0.05 AU)— several times closer to its parent star than Mercury is to our sun. (An AU is astronomical un ...
... Peg b (named after its parent star 51 Peg A, the 51st brightest star in the constellation Pegasus), is a giant planet with a very short period (4 days) and a correspondingly tiny semi -major axis (0.05 AU)— several times closer to its parent star than Mercury is to our sun. (An AU is astronomical un ...
Sec 30.1 - Highland High School
... Mass of the Milky Way Stellar populations in the Milky Way There are few stars and little interstellar material currently forming in the halo or the nuclear bulge of the galaxy, and this is one of the distinguishing features of Population II stars. Age is another, and can be determined by the lower ...
... Mass of the Milky Way Stellar populations in the Milky Way There are few stars and little interstellar material currently forming in the halo or the nuclear bulge of the galaxy, and this is one of the distinguishing features of Population II stars. Age is another, and can be determined by the lower ...
Distances in Cosmology One of the most basic measurements that
... One might think that the best standard candles are rock-steady in their luminosity, but in practice the most useful ones are variable. The reason is partially that they are thus easier to pick out in other galaxies (which have billions of steady stars), but also partially happenstance. The first of ...
... One might think that the best standard candles are rock-steady in their luminosity, but in practice the most useful ones are variable. The reason is partially that they are thus easier to pick out in other galaxies (which have billions of steady stars), but also partially happenstance. The first of ...
A Detailed Derivation of the Radial Velocity Equation
... Of the over 300 extrasolar planets discovered to date, the vast majority have been found using the RADIAL VELOCITY METHOD (also known as DOPPLER SPECTROSCOPY or the DOPPLER METHOD). The purpose of this paper is to derive the theoretical equation that is asso ...
... Of the over 300 extrasolar planets discovered to date, the vast majority have been found using the RADIAL VELOCITY METHOD (also known as DOPPLER SPECTROSCOPY or the DOPPLER METHOD). The purpose of this paper is to derive the theoretical equation that is asso ...
New Worlds on the Horizon: Earth-Sized Planets Close to Other
... The search for habitable planets like Earth around other stars fulfils an ancient imperative to understand our origins and place in the cosmos. The past decade has seen the discovery of hundreds of planets, but nearly all are gas giants like Jupiter and Saturn. Recent advances in instrumentation and ...
... The search for habitable planets like Earth around other stars fulfils an ancient imperative to understand our origins and place in the cosmos. The past decade has seen the discovery of hundreds of planets, but nearly all are gas giants like Jupiter and Saturn. Recent advances in instrumentation and ...
Double Star Observations - minorplanetobserver.com
... Check those boxes for those filters for which you want the observations used to determine the distance and position angle of the secondary star. If you select a filter in this group, then it must also be selected in the Obs group. For faint stars, where the SNR is not as high, you may want to use on ...
... Check those boxes for those filters for which you want the observations used to determine the distance and position angle of the secondary star. If you select a filter in this group, then it must also be selected in the Obs group. For faint stars, where the SNR is not as high, you may want to use on ...
In 1929, the astronomer Edwin Hubble observed that the light from
... The observations made by Hubble support the idea that the Universe is expanding. This means that galaxies are continually moving away from each other and from the Earth. Figure 2 shows a student using a balloon to model the idea of an expanding Universe. Some dots, which represent galaxies, were ma ...
... The observations made by Hubble support the idea that the Universe is expanding. This means that galaxies are continually moving away from each other and from the Earth. Figure 2 shows a student using a balloon to model the idea of an expanding Universe. Some dots, which represent galaxies, were ma ...
Fluorine abundances in dwarf stars of the solar neighbourhood⋆
... (Renda et al. 2004; Kobayashi et al. 2011). However, the relative contributions of the three F productors remains disputed. The targets observed so far are probably not the most appropriate one for deriving accurate F abundances. First, most of them are giant stars, where mixing may have occurred, c ...
... (Renda et al. 2004; Kobayashi et al. 2011). However, the relative contributions of the three F productors remains disputed. The targets observed so far are probably not the most appropriate one for deriving accurate F abundances. First, most of them are giant stars, where mixing may have occurred, c ...
Educator`s Guide
... They go as far back in time as the beginning of recorded history. For instance, the ancient Egyptians saw him as Osirus, the god of the Afterlife. Pyramids built 2500 BC possessed burial chambers with viewing shafts that aligned with Orion’s belt. 4000 years ago ancient Jews saw him as the biblical ...
... They go as far back in time as the beginning of recorded history. For instance, the ancient Egyptians saw him as Osirus, the god of the Afterlife. Pyramids built 2500 BC possessed burial chambers with viewing shafts that aligned with Orion’s belt. 4000 years ago ancient Jews saw him as the biblical ...
Science Quarter 3 Lessons
... The motion of an object can change by speeding up, slowing down or changing direction. Forces cause changes in motion. If a force is applied in the same direction of an object's motion, the speed will increase. If a force is applied in the opposite direction of an object's motion, the speed will dec ...
... The motion of an object can change by speeding up, slowing down or changing direction. Forces cause changes in motion. If a force is applied in the same direction of an object's motion, the speed will increase. If a force is applied in the opposite direction of an object's motion, the speed will dec ...
looking up! - Discover the universe
... The Moon is the easiest object to observe in the sky as it is bright and completely safe to observe, unlike the Sun. It’s possible to observe the Moon in urban and rural areas, regardless of the amount of light pollution. Moreover, as it continually changes shape and location in the sky, it’s a perf ...
... The Moon is the easiest object to observe in the sky as it is bright and completely safe to observe, unlike the Sun. It’s possible to observe the Moon in urban and rural areas, regardless of the amount of light pollution. Moreover, as it continually changes shape and location in the sky, it’s a perf ...
Conceptual Integrated Science—Chapter 28
... All of the above are about the same. Explanation: Note the relation T, where the frequency of radiant energy is proportional to the absolute temperature of the emitter. Blue light has a higher frequency than red light and yellow light, and therefore, blue light is emitted by a hotter star. ...
... All of the above are about the same. Explanation: Note the relation T, where the frequency of radiant energy is proportional to the absolute temperature of the emitter. Blue light has a higher frequency than red light and yellow light, and therefore, blue light is emitted by a hotter star. ...
Corvus (constellation)
Corvus is a small constellation in the Southern Celestial Hemisphere. Its name comes from the Latin word ""raven"" or ""crow"". It includes only 11 stars with brighter than 4.02 magnitudes. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi from a distinctive quadrilateral in the night sky. The young star Eta Corvi has been found to have two debris disks.