Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... delay between individual bursts is required, to allow the replenishing of a gas pool up to some critical threshold. Multiple (even relatively recent) episodes of star formation in these objects carry a strong resemblance to what is found for dwarf galaxies in the local universe (e.g. Tolstoy et al. ...
... delay between individual bursts is required, to allow the replenishing of a gas pool up to some critical threshold. Multiple (even relatively recent) episodes of star formation in these objects carry a strong resemblance to what is found for dwarf galaxies in the local universe (e.g. Tolstoy et al. ...
ULXs: General Properties and Variability - X
... luminous photo-ionized nebulae around them- require high luminosity to photoionize them •Quite a few have “soft” components well fit by low kT black body- consistent with high mass (Miller this meeting). ...
... luminous photo-ionized nebulae around them- require high luminosity to photoionize them •Quite a few have “soft” components well fit by low kT black body- consistent with high mass (Miller this meeting). ...
A COMPREHENSIVE COMPARISON OF THE SUN TO
... identify 11 maximally independent properties that have plausible correlations with habitability and that have been observed by, or can be derived from, sufficiently large, currently available, and representative stellar surveys. By comparing solar values for the 11 properties to the resultant stella ...
... identify 11 maximally independent properties that have plausible correlations with habitability and that have been observed by, or can be derived from, sufficiently large, currently available, and representative stellar surveys. By comparing solar values for the 11 properties to the resultant stella ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... potential (Roberts 1969). This scenario is in agreement with the recent work of Vallée (2014) where the hot dust (with masers and newborn stars) seems to peak near the inner arm edge while the stars are all over the arms. Furthermore, to analyze the interaction between the arm and the stellar compon ...
... potential (Roberts 1969). This scenario is in agreement with the recent work of Vallée (2014) where the hot dust (with masers and newborn stars) seems to peak near the inner arm edge while the stars are all over the arms. Furthermore, to analyze the interaction between the arm and the stellar compon ...
AST1100 Lecture Notes
... mass of the Sun will live 8 times longer (which is much longer than the age of the universe). A star with two times the mass of the Sun will live only 1/8 or roughly 109 years. The most massive stars only live for a few million years. We see from equation 3 that this can be explained by the fact tha ...
... mass of the Sun will live 8 times longer (which is much longer than the age of the universe). A star with two times the mass of the Sun will live only 1/8 or roughly 109 years. The most massive stars only live for a few million years. We see from equation 3 that this can be explained by the fact tha ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... The Urantia Book is probably referring here to the Hale (Mt Palomar) telescope, which went into operation in 1948. The figure 375 million thus refers to the additional new galaxies observable when the Hale telescope was put into operation, not the number of galaxies in the master universe. Recently ...
... The Urantia Book is probably referring here to the Hale (Mt Palomar) telescope, which went into operation in 1948. The figure 375 million thus refers to the additional new galaxies observable when the Hale telescope was put into operation, not the number of galaxies in the master universe. Recently ...
Astronomy Astrophysics
... present the results of the analysis of the NLTE cores of 22 DA white dwarfs covering the temperature range from 6800 K to 20 000 K. This is an extension of our previous investigation (Heber et al. 1997, henceforth Paper I) to lower temperatures. The analysis is based on the spectra obtained by Reid ...
... present the results of the analysis of the NLTE cores of 22 DA white dwarfs covering the temperature range from 6800 K to 20 000 K. This is an extension of our previous investigation (Heber et al. 1997, henceforth Paper I) to lower temperatures. The analysis is based on the spectra obtained by Reid ...
17_Testbank
... 38) What types of stars end their lives with supernovae? A) all stars that are red in color B) all stars that are yellow in color C) stars that are at least several times the mass of the Sun D) stars that are similar in mass to the Sun E) stars that have reached an age of 10 billion years Answer: C ...
... 38) What types of stars end their lives with supernovae? A) all stars that are red in color B) all stars that are yellow in color C) stars that are at least several times the mass of the Sun D) stars that are similar in mass to the Sun E) stars that have reached an age of 10 billion years Answer: C ...
The Life of a Star
... wavelength-bands. (This is called photometry; a much better way is spectroscopy, but this needs bright objects.) There are several lter systems, the best-known is the UBV system. The V (for visual; lter is similar to the human eye). ...
... wavelength-bands. (This is called photometry; a much better way is spectroscopy, but this needs bright objects.) There are several lter systems, the best-known is the UBV system. The V (for visual; lter is similar to the human eye). ...
Process of Science: PreMainSequence Stellar Life Tracks on the HR
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
... If you watch the position of the red dot on the HR diagram as the interactive figure plays, you will see that the dot is highest — meaning the object is most luminous— when it is a protostar and therefore does not yet have internal fusion. This fact can be a little surprising, but do not forget tha ...
Lecture 23: Jupiter Solar System Jupiter`s Orbit
... •In terms of its composition, Jupiter closely resembles the Sun •In fact, Jupiter could have been a star if it’s mass were about 1,000 times larger •The various colorful cloud layers have different compositions and physical properties •The band and cloud patterns change with location and time due to ...
... •In terms of its composition, Jupiter closely resembles the Sun •In fact, Jupiter could have been a star if it’s mass were about 1,000 times larger •The various colorful cloud layers have different compositions and physical properties •The band and cloud patterns change with location and time due to ...
ancient cultures 114 - Stellenbosch University
... time, however, seems to be purely astrological; the texts all being what are known as “omen” texts. A standard series of these omen texts was finalised in approximately 1000 BCE, and was named Enuma Anu Enlil. By this time, however, the first astronomical texts, known as astrolabes, had already appe ...
... time, however, seems to be purely astrological; the texts all being what are known as “omen” texts. A standard series of these omen texts was finalised in approximately 1000 BCE, and was named Enuma Anu Enlil. By this time, however, the first astronomical texts, known as astrolabes, had already appe ...
Shortв•`lived radioactivity in the early solar system: The Superв•`AGB
... C + 12C reactions. All these processes and quantities are still subject to severe uncertainties, although much effort is currently employed to provide more precise estimates of the reaction rates mentioned above (e.g., Strieder 2010; Zickefoose et al. 2010; Schürmann et al. 2011, 2012). Currently t ...
... C + 12C reactions. All these processes and quantities are still subject to severe uncertainties, although much effort is currently employed to provide more precise estimates of the reaction rates mentioned above (e.g., Strieder 2010; Zickefoose et al. 2010; Schürmann et al. 2011, 2012). Currently t ...
Kepler Telescope Spots Smallest Exoplanet Yet The Night Sky
... Big Dipper as its brightest part), Leo in the east, Hydra the Sea Serpent in the southeast, and Canis Major in the south. · Telescope users in eastern North America can watch Jupiter's moon Europa reappear out of eclipse from Jupiter's shadow around 6:59 p.m. EST. Then Io reappears out of eclipse ar ...
... Big Dipper as its brightest part), Leo in the east, Hydra the Sea Serpent in the southeast, and Canis Major in the south. · Telescope users in eastern North America can watch Jupiter's moon Europa reappear out of eclipse from Jupiter's shadow around 6:59 p.m. EST. Then Io reappears out of eclipse ar ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.