Chapter 18 - Astro1010
... “electron degeneracy” – two electrons cannot be in the same quantum state, so the core cannot contract beyond a certain point. This pressure is almost independent of temperature so when the helium starts fusing, the pressure cannot adjust and the core explodes completely disrupting the surrounding s ...
... “electron degeneracy” – two electrons cannot be in the same quantum state, so the core cannot contract beyond a certain point. This pressure is almost independent of temperature so when the helium starts fusing, the pressure cannot adjust and the core explodes completely disrupting the surrounding s ...
404.06 Stephen Drake
... etc., => given present sensitivity levels ~10-9 erg cm-2 s-1, only the largest flares will be found: e.g., Swift detections of stellar flares from the active binary systems Algol, II Peg & HR 1099 and the M4.5V star EV Lac and MAXI detections of ~12 flares You can ask for long pointed observations ...
... etc., => given present sensitivity levels ~10-9 erg cm-2 s-1, only the largest flares will be found: e.g., Swift detections of stellar flares from the active binary systems Algol, II Peg & HR 1099 and the M4.5V star EV Lac and MAXI detections of ~12 flares You can ask for long pointed observations ...
Joint formation of QSOs and spheroids: QSOs as clocks of star
... suggesting that star formation begins in the hosting spheroids at a time t* and proceeds vigoursly at least until the time tQSO, when the QSO shines. Here we estimate the duration of the star formation phase and its possible dependence on the mass. The statistics on broad emission lines suggest that ...
... suggesting that star formation begins in the hosting spheroids at a time t* and proceeds vigoursly at least until the time tQSO, when the QSO shines. Here we estimate the duration of the star formation phase and its possible dependence on the mass. The statistics on broad emission lines suggest that ...
Rocky planetesimals as the origin of metals in DZ stars
... in sufficient density a few to several times per Galactic orbit (on average) for the solar neighbourhood (Dupuis et al. 1992, 1993a; Dupuis, Fontaine & Wesemael 1993b). Several factors have continually challenged the ISM pollution scenario. First, the typical dearth of hydrogen relative to calcium i ...
... in sufficient density a few to several times per Galactic orbit (on average) for the solar neighbourhood (Dupuis et al. 1992, 1993a; Dupuis, Fontaine & Wesemael 1993b). Several factors have continually challenged the ISM pollution scenario. First, the typical dearth of hydrogen relative to calcium i ...
Determination of accurate stellar radial
... conditions (resolution, etc.). Lest the radial-velocity measure should become meaningless at the highest level of accuracy, these features and conditions should be clearly specified along with the results (cf. Sect. 7.2). Let zobs = (λobs −λlab )/λlab be the observed shift of a certain spectral feat ...
... conditions (resolution, etc.). Lest the radial-velocity measure should become meaningless at the highest level of accuracy, these features and conditions should be clearly specified along with the results (cf. Sect. 7.2). Let zobs = (λobs −λlab )/λlab be the observed shift of a certain spectral feat ...
Deneb - Emmi
... Deneb, which means tail in Arabic, is the 19th brightest star in the universe, and one of the most well known stars in our very own Milky Way. ...
... Deneb, which means tail in Arabic, is the 19th brightest star in the universe, and one of the most well known stars in our very own Milky Way. ...
Practice Regents Questions Key
... path of the Sun observed at four locations on Earth's surface on March 21. The present positions of the Sun, Polaris, and the zenith (position directly overhead) are shown for an observer at each ...
... path of the Sun observed at four locations on Earth's surface on March 21. The present positions of the Sun, Polaris, and the zenith (position directly overhead) are shown for an observer at each ...
Kinetic equilibrium of iron in the atmospheres of cool stars
... typical subdwarf, HD 84937 as a turnoff star and HD 140283 as a moderately cool subgiant. The last two of these reference stars have also been chosen by Asplund et al. (2000) to model hydrodynamic convection in metal-poor stars. Photospheric surface gravities are usually determined by means of three ...
... typical subdwarf, HD 84937 as a turnoff star and HD 140283 as a moderately cool subgiant. The last two of these reference stars have also been chosen by Asplund et al. (2000) to model hydrodynamic convection in metal-poor stars. Photospheric surface gravities are usually determined by means of three ...
1 Ascendant Calculation The Ascendant, from an astronomical point
... usually called the rising planet and has a particular importance in the chart. However, if a planet in the twelfth house is very close (within one or two degrees) to the ascendant, then it can be taken to be the rising planet instead. If a planet is actually in conjunction with the ascendant it then ...
... usually called the rising planet and has a particular importance in the chart. However, if a planet in the twelfth house is very close (within one or two degrees) to the ascendant, then it can be taken to be the rising planet instead. If a planet is actually in conjunction with the ascendant it then ...
Astronomy and Astrophysics 336, 972, 1998
... Abstract. A Doppler image of the young K2V star LQ Hya is presented for March 1995 and is compared with earlier images taken in 1991 and 1993. Comparison is also made with a recently completed image of EK Dra, another young star that is more nearly one solar mass than LQ Hya. The image for 1995 seem ...
... Abstract. A Doppler image of the young K2V star LQ Hya is presented for March 1995 and is compared with earlier images taken in 1991 and 1993. Comparison is also made with a recently completed image of EK Dra, another young star that is more nearly one solar mass than LQ Hya. The image for 1995 seem ...
The High Eccentricity of the Planet Around 16 Cyg B
... of the tertiary exerted on the two inner bodies is different from the attraction exerted on a body at the center of mass of the inner binary system. The difference, sometimes referred to as the tidal force of the third star, can induce long-term slow modulation of the inner binary eccentricity. We w ...
... of the tertiary exerted on the two inner bodies is different from the attraction exerted on a body at the center of mass of the inner binary system. The difference, sometimes referred to as the tidal force of the third star, can induce long-term slow modulation of the inner binary eccentricity. We w ...
Neutron star masses: dwarfs, giants and neighbors
... them substantially exceeds the observational estimates. To bring this fraction into agreement with the statistics for magnetars, the additional velocity acquired by a magnetar during its formation must be primarily perpendicular to the orbital plane before the supernova explosion, and be Astronomy R ...
... them substantially exceeds the observational estimates. To bring this fraction into agreement with the statistics for magnetars, the additional velocity acquired by a magnetar during its formation must be primarily perpendicular to the orbital plane before the supernova explosion, and be Astronomy R ...
Life Histories Of Some Stars
... graph? Where do newborn babies cluster? Children? Or is there no clustering at all? Describe the shape of the graph? Is it a straight line? A curve? 5. Give each group the list of stars attached and the HR diagram attached. Instead of height and weight, the information is in Luminosity (compared to ...
... graph? Where do newborn babies cluster? Children? Or is there no clustering at all? Describe the shape of the graph? Is it a straight line? A curve? 5. Give each group the list of stars attached and the HR diagram attached. Instead of height and weight, the information is in Luminosity (compared to ...
Note - HKU Physics
... • Mass: Ranges from about 0.1 to 30 solar masses for most living stars. The symbol for solar mass is M⊙ . In fact, 1M⊙ ≈ 2 × 1033 g, which is about 1000 times more massive than Jupiter, or about 3 × 105 times more massive than the Earth. • Radius: Ranges from about 0.1 to 1000 solar radii for most l ...
... • Mass: Ranges from about 0.1 to 30 solar masses for most living stars. The symbol for solar mass is M⊙ . In fact, 1M⊙ ≈ 2 × 1033 g, which is about 1000 times more massive than Jupiter, or about 3 × 105 times more massive than the Earth. • Radius: Ranges from about 0.1 to 1000 solar radii for most l ...
Reassessing the formation of the inner Oort cloud
... potential. Eggers defined a comet to be in the Oort cloud if it attained q > 33 AU and simultaneously a > 110 AU. With these definitions, he obtained efficiencies of 1.7% and 4.8% for the low and high density clusters respectively, with comets on orbits with a typical semi-major axis between 3 000 ...
... potential. Eggers defined a comet to be in the Oort cloud if it attained q > 33 AU and simultaneously a > 110 AU. With these definitions, he obtained efficiencies of 1.7% and 4.8% for the low and high density clusters respectively, with comets on orbits with a typical semi-major axis between 3 000 ...
2 Galaxy morphology and classification
... • Irr-II are peculiar systems, such as M82 (Figure 2.9). The amorphous appearance of M82 is due to a dust-enshrouded burst of star formation thought to have been triggered by a close encounter with M81. ...
... • Irr-II are peculiar systems, such as M82 (Figure 2.9). The amorphous appearance of M82 is due to a dust-enshrouded burst of star formation thought to have been triggered by a close encounter with M81. ...
Luminosity and Mass Functions of Galaxies
... parameters (e.g. Dn (4000), Sérsic index, Hubble type, quantitative morphology parameters) are nearly uncorrelated with environment. Significant differences between Nn = 0 and Nn = 1. Degeneracy between center of small group and edge of large cluster, but Blanton & Berlind (2007) show this does not ...
... parameters (e.g. Dn (4000), Sérsic index, Hubble type, quantitative morphology parameters) are nearly uncorrelated with environment. Significant differences between Nn = 0 and Nn = 1. Degeneracy between center of small group and edge of large cluster, but Blanton & Berlind (2007) show this does not ...
Aquarius (constellation)
Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for ""water-carrier"" or ""cup-carrier"", and its symbol is 20px (Unicode ♒), a representation of water.Aquarius is one of the oldest of the recognized constellations along the zodiac (the sun's apparent path). It was one of the 48 constellations listed by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.