Word doc - UC-HiPACC - University of California, Santa Cruz
... Supernovae are not alike. For decades, astronomers had known that supernovae fell into different types based on their light curves, that is, their pattern of rising and falling brightness. Later, they found these types actually corresponded to different physical circumstances triggering the explosio ...
... Supernovae are not alike. For decades, astronomers had known that supernovae fell into different types based on their light curves, that is, their pattern of rising and falling brightness. Later, they found these types actually corresponded to different physical circumstances triggering the explosio ...
Friday03
... • Nature? Elliptical galaxies only form in protoclusters at high redshift. Rest of population is due to infall. • or Nurture? Galaxy evolution proceeds along a different path within dense environments. ...
... • Nature? Elliptical galaxies only form in protoclusters at high redshift. Rest of population is due to infall. • or Nurture? Galaxy evolution proceeds along a different path within dense environments. ...
The Origin and Evolution of Dust in Galaxies
... Star formation rate (SFR) > Gas injection rate from SNe and AGB LMC star formation depends on the large reservoir of existing ISM gas The LMC is getting gas poorer. The SFR is likely to be declining with time. Chemical evolution of the LMC ISM is very slow process (~1 Gyrs) – ISM gas : 8x108 Msun (H ...
... Star formation rate (SFR) > Gas injection rate from SNe and AGB LMC star formation depends on the large reservoir of existing ISM gas The LMC is getting gas poorer. The SFR is likely to be declining with time. Chemical evolution of the LMC ISM is very slow process (~1 Gyrs) – ISM gas : 8x108 Msun (H ...
White dwarf binaries
... Naked-eye observations of nova outbursts U Gem at maximum light (Hind 1856) SS Cyg found from Harvard plates (Wells 1896) Term ‘dwarf novae’ coined by Payne-Gaposchkin and Gaposchkin (1938) Flickering found in UX UMa (Linnell 1949, 1950) 71 s pulsations in DQ Her (Walker 1956) Identification of WD a ...
... Naked-eye observations of nova outbursts U Gem at maximum light (Hind 1856) SS Cyg found from Harvard plates (Wells 1896) Term ‘dwarf novae’ coined by Payne-Gaposchkin and Gaposchkin (1938) Flickering found in UX UMa (Linnell 1949, 1950) 71 s pulsations in DQ Her (Walker 1956) Identification of WD a ...
Origin and evolution of magnetars
... tend to have higher magnetic fluxes than less massive stars, and that the incidence of magnetism on the main sequence increases with mass. Some 25 per cent of O and early B stars in the Orion cluster are strongly magnetic with fields in the range 600–1500 G (Donati et al. 2002; Petit et al. 2008) so ...
... tend to have higher magnetic fluxes than less massive stars, and that the incidence of magnetism on the main sequence increases with mass. Some 25 per cent of O and early B stars in the Orion cluster are strongly magnetic with fields in the range 600–1500 G (Donati et al. 2002; Petit et al. 2008) so ...
Reassessing the formation of the inner Oort cloud
... We re-examine the formation of the inner Oort comet cloud while the Sun was in its birth cluster with the aid of numerical simulations. This work is a continuation of an earlier study (Brasser et al., 2006) with several substantial modifications. First, the system consisting of stars, planets and co ...
... We re-examine the formation of the inner Oort comet cloud while the Sun was in its birth cluster with the aid of numerical simulations. This work is a continuation of an earlier study (Brasser et al., 2006) with several substantial modifications. First, the system consisting of stars, planets and co ...
Study of an unbiased sample of B stars observed with Hipparcos
... classes. For the latter three groups of variables, however, it is difficult to define a class. Different types of variations exist for the supergiants, among them microvariations in Luminous Blue Variables, in WR stars, and α Cyg-type variability in other supergiants. The instability mechanism remai ...
... classes. For the latter three groups of variables, however, it is difficult to define a class. Different types of variations exist for the supergiants, among them microvariations in Luminous Blue Variables, in WR stars, and α Cyg-type variability in other supergiants. The instability mechanism remai ...
Quantitative evidence of an intrinsic luminosity spread in the Orion
... magnitude of the target star, Δzacc is the estimated contribution to the observed brightness due to disk accretion, Az is the extinction, BCz, is the bolometric correction, and DM is the distance modulus. For the WFI data, we used an analogous expression for the I band. To estimate the various term ...
... magnitude of the target star, Δzacc is the estimated contribution to the observed brightness due to disk accretion, Az is the extinction, BCz, is the bolometric correction, and DM is the distance modulus. For the WFI data, we used an analogous expression for the I band. To estimate the various term ...
PH607lec11
... It suggests that there might be an upper ceiling to how large a galaxy can grow. Perhaps when a galaxy gets to be very large, its gravity is so strong that it rips up smaller galaxies that pass nearby before they can join it. Another question is why, if all galaxies are mergers of smaller ones, many ...
... It suggests that there might be an upper ceiling to how large a galaxy can grow. Perhaps when a galaxy gets to be very large, its gravity is so strong that it rips up smaller galaxies that pass nearby before they can join it. Another question is why, if all galaxies are mergers of smaller ones, many ...
SUPERNOVA EMISSION FROM GAMMA RAYS TO THE INFRARED
... blackbody spectrum of similar temperature. All in all, about 5070% of the deposited energy probably emerges in the midIR (350 um) in this ...
... blackbody spectrum of similar temperature. All in all, about 5070% of the deposited energy probably emerges in the midIR (350 um) in this ...
Photoelectric Photometry of the Pleiades
... The computer program you will use is a realistic simulation of a UBV photometer attached to a moderate sized research telescope. The telescope is controlled by a computer that allows you to move from star to star and make measurements. Different filters can be selected for each observation, and the ...
... The computer program you will use is a realistic simulation of a UBV photometer attached to a moderate sized research telescope. The telescope is controlled by a computer that allows you to move from star to star and make measurements. Different filters can be selected for each observation, and the ...
Word - Department of Physics - Hong Kong University of Science
... 2. Although the fluid particles on the surface are so light with respect to the centre of the red giant, still the attraction between the particles and the centre is so strong and may make the red giant collapse. In order to restore its original shape, we applied the Hard Sphere Model of a Red Giant ...
... 2. Although the fluid particles on the surface are so light with respect to the centre of the red giant, still the attraction between the particles and the centre is so strong and may make the red giant collapse. In order to restore its original shape, we applied the Hard Sphere Model of a Red Giant ...
LET THE STARS GET IN YOUR EYES SKY MOTIONS
... Telescopes are made of either mirrors or lenses. The main mirror or lens of a telescope is known as the primary mirror. It bends or reflects the light striking it's surface back to where it can be focused. The place where the object comes into focus is known as the focal point. The distance between ...
... Telescopes are made of either mirrors or lenses. The main mirror or lens of a telescope is known as the primary mirror. It bends or reflects the light striking it's surface back to where it can be focused. The place where the object comes into focus is known as the focal point. The distance between ...
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.