On the nature and detectability of Type Ib/c supernova progenitors
... YWL21) end their lives while they are filling their Rochelobes during Case ABB or BB mass transfer (i.e., mass transfer from the He star during/after the carbon-oxygen core contraction phase; see Yoon et al. 2010 for more details). For comparison, the evolutionary track of a single, pure helium star ...
... YWL21) end their lives while they are filling their Rochelobes during Case ABB or BB mass transfer (i.e., mass transfer from the He star during/after the carbon-oxygen core contraction phase; see Yoon et al. 2010 for more details). For comparison, the evolutionary track of a single, pure helium star ...
The Next Great Exoplanet Hunt Please share
... around a Sun-like star. For this reason, a meaningful transit survey must include tens of thousands of stars, or more. Because faint stars far outnumber bright ones in any given region of the sky, a practical strategy is to monitor a rich field of relatively faint stars. This is precisely what the K ...
... around a Sun-like star. For this reason, a meaningful transit survey must include tens of thousands of stars, or more. Because faint stars far outnumber bright ones in any given region of the sky, a practical strategy is to monitor a rich field of relatively faint stars. This is precisely what the K ...
Publications 2003 - Département d`Astrophysique, Géophysique et
... independently performed by several teams of the COROT Seismology Working Group. The aim of such exercises, which are commonly used in helioseismology, is to prepare the data analysis and scientific interpretation of the asteroseismic COROT observations. This will help in the development and testing ...
... independently performed by several teams of the COROT Seismology Working Group. The aim of such exercises, which are commonly used in helioseismology, is to prepare the data analysis and scientific interpretation of the asteroseismic COROT observations. This will help in the development and testing ...
Chromospherically young, kinematically old stars
... attention to them, but interpret them as possible runaway stars. Rocha-Pinto et al. (2002) have increased the number of active stars with spatial velocities to 145. Several of these stars, show velocities which are inconsistent with their presumed age. The term CYKOS (acronym for chromospherically y ...
... attention to them, but interpret them as possible runaway stars. Rocha-Pinto et al. (2002) have increased the number of active stars with spatial velocities to 145. Several of these stars, show velocities which are inconsistent with their presumed age. The term CYKOS (acronym for chromospherically y ...
Answers to Chapter Review Questions and Problems for The
... Answer: The three basic units are degrees, minutes and seconds. There are 360 degrees in a circle, 60 minutes in a degree and 60 seconds in a minute. These relations originated in ancient Babylon. 4. Describe the position and orientation of the celestial sphere relative to the Earth. Answer: The cel ...
... Answer: The three basic units are degrees, minutes and seconds. There are 360 degrees in a circle, 60 minutes in a degree and 60 seconds in a minute. These relations originated in ancient Babylon. 4. Describe the position and orientation of the celestial sphere relative to the Earth. Answer: The cel ...
A search for debris disks in the Herschel
... within the main sequence locus (see Fig. 2). Within this sample we expect considerable contamination from dust obscured QSOs or unresolved galaxies whose optical colours are reddened into the main sequence locus (Ivezić et al. 2002). Indeed, the sample have a median r-band magnitude of 19.8, fainte ...
... within the main sequence locus (see Fig. 2). Within this sample we expect considerable contamination from dust obscured QSOs or unresolved galaxies whose optical colours are reddened into the main sequence locus (Ivezić et al. 2002). Indeed, the sample have a median r-band magnitude of 19.8, fainte ...
Seeds of a Tychonic Revolution: Telescopic Observations of the
... must be two thousand or more AU distant. Very faint stars, seen only with his telescope, must be still more distant. Mareo has a keen mind. He quickly realizes that this hypothesis is not just another speculation that can be backed only by assertions. This hypothesis is testable. Mareo’s telescopic ...
... must be two thousand or more AU distant. Very faint stars, seen only with his telescope, must be still more distant. Mareo has a keen mind. He quickly realizes that this hypothesis is not just another speculation that can be backed only by assertions. This hypothesis is testable. Mareo’s telescopic ...
Direct Detection of Galactic Halo Dark Matter
... galaxy’s spiral disk. A substantial portion of this unseen matter may be old, very cool white dwarfs (1–4). A white dwarf is the extremely dense end-state in the evolution of stars with masses less than about eight times the mass of the sun (MJ). Once a star becomes a white dwarf, it no longer produ ...
... galaxy’s spiral disk. A substantial portion of this unseen matter may be old, very cool white dwarfs (1–4). A white dwarf is the extremely dense end-state in the evolution of stars with masses less than about eight times the mass of the sun (MJ). Once a star becomes a white dwarf, it no longer produ ...
Comets, historical records and vedic literature
... Ketu (literally, moving comet) was described vividly by Varahamihira, emphasizing its rise on the west and increase in the tail size as it proceeded towards north, and eventually making contact with Ursa Major (Chandel and Sharma, 1991). Anticipating periodic paths, the seer Narada had stated ‘there ...
... Ketu (literally, moving comet) was described vividly by Varahamihira, emphasizing its rise on the west and increase in the tail size as it proceeded towards north, and eventually making contact with Ursa Major (Chandel and Sharma, 1991). Anticipating periodic paths, the seer Narada had stated ‘there ...
11-Massive Stars
... to understand the complex bipolar outflows in massive star formation and proof will require interferometer observations. The outflows are difficult to study because multiple outflows often emanate from the same large scale core. Clusters of stars form simultaneously in a core and the outflows origin ...
... to understand the complex bipolar outflows in massive star formation and proof will require interferometer observations. The outflows are difficult to study because multiple outflows often emanate from the same large scale core. Clusters of stars form simultaneously in a core and the outflows origin ...
INTERSTELLAR MedLab
... Emission – a gas cloud that receives energy from a hot star(s), allowing the nebula to give off radiation in emission. Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. ...
... Emission – a gas cloud that receives energy from a hot star(s), allowing the nebula to give off radiation in emission. Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. ...
Carbon Stars - The OzSky Star Safari
... Antares will not likely become a carbon in color and brightness) star due to its huge mass. The other first mag supergiant is Betelgeuse; one of these is usually in the night sky throughout the year. The stars in Scorpius are part of a large disintegrating association of massive stars (not ...
... Antares will not likely become a carbon in color and brightness) star due to its huge mass. The other first mag supergiant is Betelgeuse; one of these is usually in the night sky throughout the year. The stars in Scorpius are part of a large disintegrating association of massive stars (not ...
The Galactic evolution of phosphorus
... In Fig. 3, [S/Fe] versus (vs.) [Fe/H] is shown for the same sample of stars. There is a tiny difference between stars with and without planets. The difference is reflected in the [P/S] vs. [Fe/H] plot in Fig. 4. Phosphorus and sulphur behave similarly when effective temperature and gravity of the mo ...
... In Fig. 3, [S/Fe] versus (vs.) [Fe/H] is shown for the same sample of stars. There is a tiny difference between stars with and without planets. The difference is reflected in the [P/S] vs. [Fe/H] plot in Fig. 4. Phosphorus and sulphur behave similarly when effective temperature and gravity of the mo ...
DIO vol. 15 - DIO, The International Journal of Scientific History
... claimed, retrospectively) and America (where the orbit theory seemed to show that the prediction had been a mere fluke). The database will be searchable, so one can search by author, recipient, date of letter, archive or subject. It indicates where the original letter is stored and where copies exis ...
... claimed, retrospectively) and America (where the orbit theory seemed to show that the prediction had been a mere fluke). The database will be searchable, so one can search by author, recipient, date of letter, archive or subject. It indicates where the original letter is stored and where copies exis ...
DIO 15 - DIO, The International Journal of Scientific History
... the solstices, and when the Sun was at a solsticial point, he knew the fraction of the circumference of a tropic above and below the horizon. He understood the colures as circles through the celestial poles and the solsticial points, and through the celestial poles and the equinoctial points, the po ...
... the solstices, and when the Sun was at a solsticial point, he knew the fraction of the circumference of a tropic above and below the horizon. He understood the colures as circles through the celestial poles and the solsticial points, and through the celestial poles and the equinoctial points, the po ...
In This Issue… The Milky Way above Kancamagus Highway
... The program was held from 9pm to 11pm and was hosted by NHAS members Al and Dottie Larsson, who are affiliated with the Margaret and H.A. Rey Center and live in the area. While Al Larsson set up the Center’s Meade SCT, Joe used his 17.5” Newtonian, possibly the largest aperture seen at these events. ...
... The program was held from 9pm to 11pm and was hosted by NHAS members Al and Dottie Larsson, who are affiliated with the Margaret and H.A. Rey Center and live in the area. While Al Larsson set up the Center’s Meade SCT, Joe used his 17.5” Newtonian, possibly the largest aperture seen at these events. ...
Leo Powerpoint
... Hercules plugged one of the openings and entered the den empty-handed from the other. He strangled the lion to his death and using one of his claws tore away his skin, which he later used as an impermeable armor on his body for the remaining 11 tasks that he had to complete. As Hercules came out suc ...
... Hercules plugged one of the openings and entered the den empty-handed from the other. He strangled the lion to his death and using one of his claws tore away his skin, which he later used as an impermeable armor on his body for the remaining 11 tasks that he had to complete. As Hercules came out suc ...
Variable Stars – II. Pulsating stars
... In this case the star is unstable to pulsation and any small variation, will be reinforced – the pulsation will grow until the energy input by the κ-mechanism reaches a limit. The star will then be pulsating with a stable period and amplitude. Note that the partial ionization zones can be near the s ...
... In this case the star is unstable to pulsation and any small variation, will be reinforced – the pulsation will grow until the energy input by the κ-mechanism reaches a limit. The star will then be pulsating with a stable period and amplitude. Note that the partial ionization zones can be near the s ...
Rotation Periods and Relative Ages of Solar-Type Stars
... rotation period. To begin, smaller intrinsic spread in Prot is characteristic of older LMS stars, but not young ones. This observation is apparent in Figures 3 and 4. The residuals of Pcalc - Prot are plotted against B - V in Figure 3. A concentration of data points falls on the line Pcalc - Prot = ...
... rotation period. To begin, smaller intrinsic spread in Prot is characteristic of older LMS stars, but not young ones. This observation is apparent in Figures 3 and 4. The residuals of Pcalc - Prot are plotted against B - V in Figure 3. A concentration of data points falls on the line Pcalc - Prot = ...
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 ...
Table of Contents - Imiloa Astronomy Center
... Legends of the Night Sky: Orion Educator’s Guide - The origin of the phrase ‘the dog days of summer’ comes from this ancient belief. - The star is mostly thought of now as a winter star, accompanying Orion. ...
... Legends of the Night Sky: Orion Educator’s Guide - The origin of the phrase ‘the dog days of summer’ comes from this ancient belief. - The star is mostly thought of now as a winter star, accompanying Orion. ...
The Starry Gnosis - Archidoxical Order of Magi
... goal of the operation has already been accomplished. We might say that the Holy Guardian Angel, as the Augoeides is the conductor that moves the symbol from the internal field of the imagination to the external world and the Astral Light or the Aethyr. Emotion is the driving force of the work; one’s ...
... goal of the operation has already been accomplished. We might say that the Holy Guardian Angel, as the Augoeides is the conductor that moves the symbol from the internal field of the imagination to the external world and the Astral Light or the Aethyr. Emotion is the driving force of the work; one’s ...
Ground-Based Astrometry 2010-2020
... the most intriguing sources, often at the faint limits of such surveys, from which the science is squeezed out when precise astrometric techniques are applied. We list here some of the most important questions that can be answered during the next decade by targeted optical, infrared, and radio astro ...
... the most intriguing sources, often at the faint limits of such surveys, from which the science is squeezed out when precise astrometric techniques are applied. We list here some of the most important questions that can be answered during the next decade by targeted optical, infrared, and radio astro ...
Sun, Earth, Moon Astronomy 1 — Elementary Astronomy LA Mission College Spring F2015
... 3) If you were constructing a scale model of the solar system that used a Sun that was the size of a basketball (approximately 12 inches in diameter), which of the following lengths would most closely approximate the scaled distance between Earth and the Sun? a) 3 feet (length of an outstretched arm ...
... 3) If you were constructing a scale model of the solar system that used a Sun that was the size of a basketball (approximately 12 inches in diameter), which of the following lengths would most closely approximate the scaled distance between Earth and the Sun? a) 3 feet (length of an outstretched arm ...
Constellation
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in Western-traditional asterisms from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky.Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located. For example, saying the Horsehead Nebula is near Orion's Belt in the constellation Orion immediately locates it just south of the ecliptic and conveys that it is best observable in winter from the Northern Hemisphere.