Statistical analysis of stellar evolution
... its dominant position in a CMD, the evolved red giants, and the even older white dwarfs. Today the physical processes that govern stellar formation and evolution are studied with complex computer models that can be used to predict the plotted magnitudes on a set of CMDs as a function of stellar para ...
... its dominant position in a CMD, the evolved red giants, and the even older white dwarfs. Today the physical processes that govern stellar formation and evolution are studied with complex computer models that can be used to predict the plotted magnitudes on a set of CMDs as a function of stellar para ...
Age-Dating of Young Stars and Stellar Systems
... massive-star population of single age, stars with vastly different zero-age-mainsequence masses can have similar Teff and L and contribute to the integrated light. Any age determination is therefore dependent on an assumption on the IMF. Since massive stars are rare and have much larger luminosities ...
... massive-star population of single age, stars with vastly different zero-age-mainsequence masses can have similar Teff and L and contribute to the integrated light. Any age determination is therefore dependent on an assumption on the IMF. Since massive stars are rare and have much larger luminosities ...
The Next Great Exoplanet Hunt Please share
... because many astronomical observations are limited by photoncounting noise. The greater the number of photons we collect, the smaller the effects of shot noise and the higher the signalto-noise ratio. This in turn allows us to search for smaller exoplanets, which produce smaller transit signals. To ...
... because many astronomical observations are limited by photoncounting noise. The greater the number of photons we collect, the smaller the effects of shot noise and the higher the signalto-noise ratio. This in turn allows us to search for smaller exoplanets, which produce smaller transit signals. To ...
The surface composition of Beta Pictoris
... has prompted King and Patten (1992) to suggest that β Pic is a λ Boo star. We note that the HST GHRS data analyzed by Lanz and Hubeny (1995) also rule out a low metallicity, and that their own evaluation of Geneva indices leads to a normal rather than subsolar iron abundance. Why does the signature ...
... has prompted King and Patten (1992) to suggest that β Pic is a λ Boo star. We note that the HST GHRS data analyzed by Lanz and Hubeny (1995) also rule out a low metallicity, and that their own evaluation of Geneva indices leads to a normal rather than subsolar iron abundance. Why does the signature ...
Introduction
... to stars. These stars return much of their mass, often enriched in “metals” – elements heavier than H and He – to the interstellar medium (ISM). Stellar evolution also yields remnants which add to the dark matter content, and both stars and gas may be accreted by black holes. Galaxies are sometimes ...
... to stars. These stars return much of their mass, often enriched in “metals” – elements heavier than H and He – to the interstellar medium (ISM). Stellar evolution also yields remnants which add to the dark matter content, and both stars and gas may be accreted by black holes. Galaxies are sometimes ...
Science performance of Gaia, ESA`s space
... • Gaia will detect tens of thousands of brown dwarfs, both drifting through space in isolation and in orbit around other stars (Haywood and Jordi 2002). This data is vital for investigating the physics of star formation since brown dwarfs represent stars that “just did not make it” to core hydrogen ...
... • Gaia will detect tens of thousands of brown dwarfs, both drifting through space in isolation and in orbit around other stars (Haywood and Jordi 2002). This data is vital for investigating the physics of star formation since brown dwarfs represent stars that “just did not make it” to core hydrogen ...
- Cosmotography
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
... dwarfs have been identified observationally (Stinson et al. 2009), but it is not clear if these stars were accreted, or formed in-situ. Star formation in dwarfs is thought to occur in stochastic episodes (Tolstoy et al. 2009; Weisz et al. 2011), which could be triggered by accretion events. An iconi ...
Part IV: Stars
... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
... interior, photons can only travel a fraction of a millimeter before “colliding” with an electron and deflecting into a new direction. So photons bounce around at random and only slowly make their way out of the Sun. Mathematical models use the observed composition and mass of the Sun, along with the ...
The Probability and Effects of an Asteroid Impact with Earth
... are 3.35 and 4.19, respectively, while AAVSO chart values are 3.6 and 4.2. Since all good eye estimates of δ Cephei are made under normal light conditions, the use of AAVSO charts artificially depresses the observed light amplitude and skews light maximum from its true brightness. ...
... are 3.35 and 4.19, respectively, while AAVSO chart values are 3.6 and 4.2. Since all good eye estimates of δ Cephei are made under normal light conditions, the use of AAVSO charts artificially depresses the observed light amplitude and skews light maximum from its true brightness. ...
1 - Piscataway High School
... enough, helium fusion begins to make energy, and the temperature rises, but pressure does not increase because the gas is degenerate. The higher temperature increases the helium fusion even further, and the result is a runaway explosion called the helium flash in which, for a few minutes, the core o ...
... enough, helium fusion begins to make energy, and the temperature rises, but pressure does not increase because the gas is degenerate. The higher temperature increases the helium fusion even further, and the result is a runaway explosion called the helium flash in which, for a few minutes, the core o ...
Archaeoastronomical Study of the Main Pyramids of Giza
... Mundi (dating to XIII century) East is at the top. According to Bauval (2006), for ancient Egyptians it was more logical to put South, and not North, on the top of their maps. South was “up” since the Nile River flows down from South and since the Sun culminates exactly in the South at midday. Actua ...
... Mundi (dating to XIII century) East is at the top. According to Bauval (2006), for ancient Egyptians it was more logical to put South, and not North, on the top of their maps. South was “up” since the Nile River flows down from South and since the Sun culminates exactly in the South at midday. Actua ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.