Chemical Composition of Planetary Nebulae: The Galaxy and the
... rise to Type I bipolar (or asymmetric) PN. Recently, Marigo et al. [15] have presented abundances of Galactic PN for which ISO and IUE spectra are available, so that their abundances are presumably well determined, as all important ionization stages have been considered, making it practically unnece ...
... rise to Type I bipolar (or asymmetric) PN. Recently, Marigo et al. [15] have presented abundances of Galactic PN for which ISO and IUE spectra are available, so that their abundances are presumably well determined, as all important ionization stages have been considered, making it practically unnece ...
Chapter 12: The Life Cycle of Stars (contʼd)
... • the period of a massive star's life when carbon, nitrogen, and oxygen are fusing in different shells outside the core • a type of hydrogen fusion that uses carbon, nitrogen, and oxygen atoms as catalysts • the process by which helium is fused into carbon, nitrogen, and oxygen • the perio ...
... • the period of a massive star's life when carbon, nitrogen, and oxygen are fusing in different shells outside the core • a type of hydrogen fusion that uses carbon, nitrogen, and oxygen atoms as catalysts • the process by which helium is fused into carbon, nitrogen, and oxygen • the perio ...
The Spitzer/GLIMPSE Surveys - UW-Madison Astronomy
... crash into the ambient interstellar medium and excite NIR line emission. NIR H2 narrow-band images and ISO spectra show that the extended 4.5 μm emission of the massive DR21 outflow is due to shocked H2 (Davis et al. 2007; Smith et al. 2006, and references therein); Smith et al. (2006) do not detect ...
... crash into the ambient interstellar medium and excite NIR line emission. NIR H2 narrow-band images and ISO spectra show that the extended 4.5 μm emission of the massive DR21 outflow is due to shocked H2 (Davis et al. 2007; Smith et al. 2006, and references therein); Smith et al. (2006) do not detect ...
October 2012 - astronomy for beginners
... there is a clear sky and with no Moon the prospect for seeing some meteors from the shower is looking quite promising. It will be better fun to watch for meteors with a friend or friends. This also helps because a larger proportion of the sky can be covered. Members of a group could also take turns ...
... there is a clear sky and with no Moon the prospect for seeing some meteors from the shower is looking quite promising. It will be better fun to watch for meteors with a friend or friends. This also helps because a larger proportion of the sky can be covered. Members of a group could also take turns ...
Lec10_ch12_deathofstars
... – A relatively gentle explosion of hydrogen gas on the surface of a white ...
... – A relatively gentle explosion of hydrogen gas on the surface of a white ...
Supermassive black hole activity in local field early
... Bona fide active black holes (after LMXB contamination assessment): between 24-34% host an accreting black hole. Strong lower limit to occupation fraction in the local universe. AVERAGE Lx/Ledd DECREASES WITH INCREASING BLACK HOLE MASS (Gallo+08,10) ...
... Bona fide active black holes (after LMXB contamination assessment): between 24-34% host an accreting black hole. Strong lower limit to occupation fraction in the local universe. AVERAGE Lx/Ledd DECREASES WITH INCREASING BLACK HOLE MASS (Gallo+08,10) ...
Galaxy Formation Leading questions for today • How do visible
... result depends on sense of rotation of disk: • prograde: disk angular momentum pointing in same direction as that of orbit. • retrograde: disk angular momentum pointing in opposite direction as that of orbit. Tails are formed by tidal forces. Each disk can produce 1 tail. Why is this ? Model the mer ...
... result depends on sense of rotation of disk: • prograde: disk angular momentum pointing in same direction as that of orbit. • retrograde: disk angular momentum pointing in opposite direction as that of orbit. Tails are formed by tidal forces. Each disk can produce 1 tail. Why is this ? Model the mer ...
Chapter 26.2 notes
... Most stars are found along a diagonal band running from the bright hot stars on the upper left to the dim cool stars on the lower right. Astronomers call this diagonal band on the H-R diagram the main sequence. About 90% of all stars are found on the main sequence. The sun lies near the middle of th ...
... Most stars are found along a diagonal band running from the bright hot stars on the upper left to the dim cool stars on the lower right. Astronomers call this diagonal band on the H-R diagram the main sequence. About 90% of all stars are found on the main sequence. The sun lies near the middle of th ...
FP11: DRAKE et al. - Astronomical Institute WWW Homepage
... line profile, brightness, and magnetic field as a function of the rotating phase, which can be explained in terms of an oblique magnetic rotator model. We estimated the effective temperature, surface gravity, mass, luminosity, and radius of this star, as well as the inclination angle of the rotation ...
... line profile, brightness, and magnetic field as a function of the rotating phase, which can be explained in terms of an oblique magnetic rotator model. We estimated the effective temperature, surface gravity, mass, luminosity, and radius of this star, as well as the inclination angle of the rotation ...
RESEARCH STATEMENT Chromospheres and winds
... drive winds from cool (.8000K) evolved stars such as K and early-M stars are not well known. Unlike hot stars, radiative acceleration of gaseous material in K stars is not large enough to drive a wind. There is insufficient dusty material to contribute to dust–driven winds and coherent pulsations st ...
... drive winds from cool (.8000K) evolved stars such as K and early-M stars are not well known. Unlike hot stars, radiative acceleration of gaseous material in K stars is not large enough to drive a wind. There is insufficient dusty material to contribute to dust–driven winds and coherent pulsations st ...
Wild Surmise Study
... to come into local equilibrium. Since the laws that determine electromagnetic radiation, such as light, did not come into existence until a finite time after the initial expansion began, the inaugural flash of light that is now the background radiation dates to the time when the laws began - when th ...
... to come into local equilibrium. Since the laws that determine electromagnetic radiation, such as light, did not come into existence until a finite time after the initial expansion began, the inaugural flash of light that is now the background radiation dates to the time when the laws began - when th ...
Astronomy Astrophysics MY Camelopardalis, a very massive merger progenitor &
... dimensions developed by Zucker & Mazeh (1994) and implemented in the todcor program. We cross-correlated our observational spectra against the two previously synthesised templates. The spectral range of 4400–5585Å was chosen for the analysis, since it includes the main He ii lines (4542, 4686 and 54 ...
... dimensions developed by Zucker & Mazeh (1994) and implemented in the todcor program. We cross-correlated our observational spectra against the two previously synthesised templates. The spectral range of 4400–5585Å was chosen for the analysis, since it includes the main He ii lines (4542, 4686 and 54 ...
L45 DETECTION OF PLANETARY TRANSITS ACROSS A SUN
... of A, the effective temperature of the planet is Tp ≈ 1400(1 2 A)1/4 K. This implies a thermal velocity for hydrogen of vt & 6.0 km s21. This is roughly a factor of 7 less than the calculated escape velocity of ve ≈ 42 km s21, confirming that these planets should not be losing significant amounts of ...
... of A, the effective temperature of the planet is Tp ≈ 1400(1 2 A)1/4 K. This implies a thermal velocity for hydrogen of vt & 6.0 km s21. This is roughly a factor of 7 less than the calculated escape velocity of ve ≈ 42 km s21, confirming that these planets should not be losing significant amounts of ...
CHP 14
... c. the material will become hot enough that it will radiate most strongly at x-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above A rotating black hole a. will produce a pulsar. b. will have a stronger gravitational field ...
... c. the material will become hot enough that it will radiate most strongly at x-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above A rotating black hole a. will produce a pulsar. b. will have a stronger gravitational field ...
Neutron Stars and Black Holes
... c. the material will become hot enough that it will radiate most strongly at x-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above A rotating black hole a. will produce a pulsar. b. will have a stronger gravitational field ...
... c. the material will become hot enough that it will radiate most strongly at x-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above A rotating black hole a. will produce a pulsar. b. will have a stronger gravitational field ...
Formation of elliptical galaxies
... •Disk merger remnants, as well as ULIRGS, can follow the Fundamental Plane and the MBH-relation (Robertson et al. 2005; Springel et al. 2005) •Mergers trigger strong central and extended starbursts and AGN activity (Barnes 2002, di Matteo et al 2006) •So far most dynamical, kinematical and photome ...
... •Disk merger remnants, as well as ULIRGS, can follow the Fundamental Plane and the MBH-relation (Robertson et al. 2005; Springel et al. 2005) •Mergers trigger strong central and extended starbursts and AGN activity (Barnes 2002, di Matteo et al 2006) •So far most dynamical, kinematical and photome ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.