here - NASA/IPAC Extragalactic Database
... be called spectroscopically an O4 V. This includes any star with a mass from ∼35M⊙ to ∼85M⊙. There are a few other caveats that need to be kept in mind when talking about the main-sequence evolution of massive stars. First, the luminosity class (“I” vs “V”, say) of O-type stars depends primarily on ...
... be called spectroscopically an O4 V. This includes any star with a mass from ∼35M⊙ to ∼85M⊙. There are a few other caveats that need to be kept in mind when talking about the main-sequence evolution of massive stars. First, the luminosity class (“I” vs “V”, say) of O-type stars depends primarily on ...
File - Adriana Romo
... Scientific: They contain as much mass as the sun. Interviewer: How much volume do white dwarfs contain? Scientist: They could contain as much as earth. Interviewer: What is the ultimate fate for the stars like the sun? Scientist: Upon its dead, a low mass star slowly collapse to become a white dwarf ...
... Scientific: They contain as much mass as the sun. Interviewer: How much volume do white dwarfs contain? Scientist: They could contain as much as earth. Interviewer: What is the ultimate fate for the stars like the sun? Scientist: Upon its dead, a low mass star slowly collapse to become a white dwarf ...
Non-thermal hard X-ray emission from stellar coronae
... turbulent mixing of gas, dust and grain phases, with given chemical composition Boundary between active (= turbulent) and dead (= laminar) zone occurs at very low ionization fraction, log Xe ~ -12 The size of the dead zone depends on the frequency, energetics, and hardness of stellar flares (statist ...
... turbulent mixing of gas, dust and grain phases, with given chemical composition Boundary between active (= turbulent) and dead (= laminar) zone occurs at very low ionization fraction, log Xe ~ -12 The size of the dead zone depends on the frequency, energetics, and hardness of stellar flares (statist ...
CENTRAL TEXAS COLLEGE
... Stars and Galaxies is one of the two introductory Astronomy classes we teach here at Central Texas College. The other class is what we call Solar System. Astronomy was the first of the sciences, and when colleges and universities were established in the middle Ages, it was one of the seven subjects ...
... Stars and Galaxies is one of the two introductory Astronomy classes we teach here at Central Texas College. The other class is what we call Solar System. Astronomy was the first of the sciences, and when colleges and universities were established in the middle Ages, it was one of the seven subjects ...
Detection of Artificial Satellites in Images Acquired in Track Rate Mode
... The goal of the recent sensor development is the creation of autonomous observatories which could do the entire job automatically [4]. Ultimately, they should be operated by a single person, who checks the system status, error reports and consistency of observation reports. Presently, this goal is ...
... The goal of the recent sensor development is the creation of autonomous observatories which could do the entire job automatically [4]. Ultimately, they should be operated by a single person, who checks the system status, error reports and consistency of observation reports. Presently, this goal is ...
THE EARTH AND THE UNIVERSE
... Help: This visual simulates the movement of the sunearthmoon system from a geocentric point of view, as if the earth were still. As the sun is very far from the earth (the visual is not to scale) we see it as small as the moon, revolving around our planet on the plane on which the earth actual ...
... Help: This visual simulates the movement of the sunearthmoon system from a geocentric point of view, as if the earth were still. As the sun is very far from the earth (the visual is not to scale) we see it as small as the moon, revolving around our planet on the plane on which the earth actual ...
Interpolation of Magnitude.
... information package are some actual charts and projects you can do starting tonight! ...
... information package are some actual charts and projects you can do starting tonight! ...
Astronomy Astrophysics Circumstellar emission in Be/X-ray binaries of the Magellanic
... Aims. We study the optical and near-infrared colour excesses produced by circumstellar emission in a sample of Be/X-ray binaries. Our main goals are exploring whether previously published relations, valid for isolated Be stars, are applicable to Be/X-ray binaries and computing the distance to these ...
... Aims. We study the optical and near-infrared colour excesses produced by circumstellar emission in a sample of Be/X-ray binaries. Our main goals are exploring whether previously published relations, valid for isolated Be stars, are applicable to Be/X-ray binaries and computing the distance to these ...
The connection between stellar activity cycles and magnetic field
... an instrumental role in advancing knowledge of stellar cycles via multi-decade chromospheric observations of solar-like stars (Wilson 1978; Baliunas et al. 1995; Metcalfe et al. 2013; Egeland et al. 2015). Further observational campaigns have also been directly inspired by the work done at the Mount ...
... an instrumental role in advancing knowledge of stellar cycles via multi-decade chromospheric observations of solar-like stars (Wilson 1978; Baliunas et al. 1995; Metcalfe et al. 2013; Egeland et al. 2015). Further observational campaigns have also been directly inspired by the work done at the Mount ...
PDF only - at www.arxiv.org.
... orbital elements. Therefore Kepler’s constant C must be determined accurately before deriving orbital elements. ...
... orbital elements. Therefore Kepler’s constant C must be determined accurately before deriving orbital elements. ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... http://www.cfht.hawaii.edu/∼ bernt/gsc/gscbrowser.html to identify 271 guide stars from Hubble Space Telescope. An astrometric solution was found which included a single frame scale in α, δ, a rotation angle, and quadratic terms in row and column position. The resulting solution had an r.m.s. scatte ...
... http://www.cfht.hawaii.edu/∼ bernt/gsc/gscbrowser.html to identify 271 guide stars from Hubble Space Telescope. An astrometric solution was found which included a single frame scale in α, δ, a rotation angle, and quadratic terms in row and column position. The resulting solution had an r.m.s. scatte ...
Properties of Galactic early-type O
... avoided contamination by the “worm” artifact (Sahnow et al. 2000) by using only the LiF2A spectra on the long-wavelength side (λλ1086-1183 Å) of the spectrum. Finally, the co-added merged spectra were smoothed to a resolution of 30 km s−1 to enhance the signal-to-noise ratio. For HD 66811, we used t ...
... avoided contamination by the “worm” artifact (Sahnow et al. 2000) by using only the LiF2A spectra on the long-wavelength side (λλ1086-1183 Å) of the spectrum. Finally, the co-added merged spectra were smoothed to a resolution of 30 km s−1 to enhance the signal-to-noise ratio. For HD 66811, we used t ...
Nucleosynthesis and Chemical Evolution of Oxygen
... To analyze the yields from massive stars, we consider a single model. While this is only one particular model, its yields are fairly representative of the ejecta from any star more than ten times the mass of the Sun. Chemical evolution models using detailed stellar model yields have long shown that ...
... To analyze the yields from massive stars, we consider a single model. While this is only one particular model, its yields are fairly representative of the ejecta from any star more than ten times the mass of the Sun. Chemical evolution models using detailed stellar model yields have long shown that ...
THE DENSEST GALAXY
... 4.9±0.7. The flexible stellar population synthesis models of Conroy et al. (2009), using Padova isochrones and a Kroupa initial mass function (IMF), predict M/LV = (3.5, 4.2, 4.7) for solar metallicity and ages of (8,10,12) Gyr, respectively8 . If M60-UCD1 has a younger age, the dynamical M/LV could ...
... 4.9±0.7. The flexible stellar population synthesis models of Conroy et al. (2009), using Padova isochrones and a Kroupa initial mass function (IMF), predict M/LV = (3.5, 4.2, 4.7) for solar metallicity and ages of (8,10,12) Gyr, respectively8 . If M60-UCD1 has a younger age, the dynamical M/LV could ...
Other Planetary Systems
... preexisting planets or, more likely, objects that somehow formed from supernova debris. Either way, they are not planets in the same sense as those that form during star birth; in this chapter, we will focus only on planets orbiting ordinary stars like our Sun. ...
... preexisting planets or, more likely, objects that somehow formed from supernova debris. Either way, they are not planets in the same sense as those that form during star birth; in this chapter, we will focus only on planets orbiting ordinary stars like our Sun. ...
Behavior of Li abundances in solar-analog stars
... Context. It is known that the surface lithium abundances of field solar-analog G dwarfs show a large dispersion of ∼ which our Sun is located at the lower end) despite the similarity of stellar parameters, and planet-host stars tend to show comparatively lower Li abundances in the narrow T eff range. ...
... Context. It is known that the surface lithium abundances of field solar-analog G dwarfs show a large dispersion of ∼ which our Sun is located at the lower end) despite the similarity of stellar parameters, and planet-host stars tend to show comparatively lower Li abundances in the narrow T eff range. ...
AST1100 Lecture Notes
... atomic nucleus. In the exercises you will also show that the typical radius of a neutron star is a few kilometers. The mass of 2-3 Suns are compressed into a sphere with a radius of a few kilometers. The density is such that if you make a small needle out of materials from a neutron star it would we ...
... atomic nucleus. In the exercises you will also show that the typical radius of a neutron star is a few kilometers. The mass of 2-3 Suns are compressed into a sphere with a radius of a few kilometers. The density is such that if you make a small needle out of materials from a neutron star it would we ...
