HST/FGS Photometry of Planetary Transits of HD 209458
... of the data from all four FGS PMTs allowed for a more consistent data set which is better fit by the model as compared to previously reported results [10]. In addition, they decreased the parameter uncertainties in some cases by a factor of 10. The STIS data for each transit was obtained using 5 con ...
... of the data from all four FGS PMTs allowed for a more consistent data set which is better fit by the model as compared to previously reported results [10]. In addition, they decreased the parameter uncertainties in some cases by a factor of 10. The STIS data for each transit was obtained using 5 con ...
400 Years of Stellar Rotation
... to some extent on rotation. How the rotation of a star depends on the presence of planets, a question already addressed by Struve, was discussed during the conference, as well as what may happen when a planet is engulfed by its host star. As demonstrated by these few points, rotation is at the cross ...
... to some extent on rotation. How the rotation of a star depends on the presence of planets, a question already addressed by Struve, was discussed during the conference, as well as what may happen when a planet is engulfed by its host star. As demonstrated by these few points, rotation is at the cross ...
Mixing in massive stellar mergers
... Together, equations (3) and (4) provide the desired relationships between the pressure, buoyancy, density and composition. Given a prescription for shock heating and an estimate of the mass loss, it is possible to determine the structure of a non-rotating product resulting from a head-on collision o ...
... Together, equations (3) and (4) provide the desired relationships between the pressure, buoyancy, density and composition. Given a prescription for shock heating and an estimate of the mass loss, it is possible to determine the structure of a non-rotating product resulting from a head-on collision o ...
The Kinematics of Star Formation: Theory and Observation in the
... of the cluster are able to accrete more mass because of their location at the deepest point in the cluster potential. These cores are therefore more likely to grow to become the most massive stars in the cluster. Competitive accretion therefore predicts that the most massive stars should form at th ...
... of the cluster are able to accrete more mass because of their location at the deepest point in the cluster potential. These cores are therefore more likely to grow to become the most massive stars in the cluster. Competitive accretion therefore predicts that the most massive stars should form at th ...
Written in the Stars
... stars. So if we are to succeed in identifying signs of life, even on a sliding probabilistic scale, we must broaden our perspective on viable biosignature gases. The second project comes out of the idea to find transiting Earth-sized planets around the brightest Sun-like stars in the sky. I had carr ...
... stars. So if we are to succeed in identifying signs of life, even on a sliding probabilistic scale, we must broaden our perspective on viable biosignature gases. The second project comes out of the idea to find transiting Earth-sized planets around the brightest Sun-like stars in the sky. I had carr ...
WASP-35b, WASP-48b, AND HAT-P-30b/WASP
... Most of the known transiting exoplanets orbit very close to their host star, which produces strong tidal forces between them. The tidal interactions may result in orbital circularization, synchronization, and decay (Pont 2009). An apparent relationship between period and eccentricity of non-transiti ...
... Most of the known transiting exoplanets orbit very close to their host star, which produces strong tidal forces between them. The tidal interactions may result in orbital circularization, synchronization, and decay (Pont 2009). An apparent relationship between period and eccentricity of non-transiti ...
– 1 – 1. Feedback From The First Stars
... into the halo gas may produce shocks, and strong outflows. These shocks may then become sites for additional subsequent star formation, while if the gas is heated and dispersed, star formation will be halted. Evidence for large scale outflows (“galactic winds”) in local group starbursting dwarfs has ...
... into the halo gas may produce shocks, and strong outflows. These shocks may then become sites for additional subsequent star formation, while if the gas is heated and dispersed, star formation will be halted. Evidence for large scale outflows (“galactic winds”) in local group starbursting dwarfs has ...
Article PDF - IOPscience
... In particular, through the discovery of various transiting planets, we have learned that extrasolar planets can have radii much larger (e.g., Hebb et al. 2009) or densities much higher (Sato et al. 2005) than Jupiter. Many, but not all, “hot Jupiters” have temperature inversions in their atmospheres ...
... In particular, through the discovery of various transiting planets, we have learned that extrasolar planets can have radii much larger (e.g., Hebb et al. 2009) or densities much higher (Sato et al. 2005) than Jupiter. Many, but not all, “hot Jupiters” have temperature inversions in their atmospheres ...
Stellar models and stellar stability
... laws of thermodynamics. Eq. (6.4) is generalized to include both the cases of radiative and convective energy transport. The term ∆∇ is the superadiabaticity of the temperature gradient that must follow from a theory of convection (in practice, the mixing length theory); for the interior one can ta ...
... laws of thermodynamics. Eq. (6.4) is generalized to include both the cases of radiative and convective energy transport. The term ∆∇ is the superadiabaticity of the temperature gradient that must follow from a theory of convection (in practice, the mixing length theory); for the interior one can ta ...
December - Weasner
... send that boat to the celestial breaker’s yard, on the grounds that it was too unwieldy. Despite being thought of as a far-southern group, I was able to hunt out a variety of targets from Northern England ! M47 was a large grouping of some 25 brighter stars which showed up well despite the Full Moon ...
... send that boat to the celestial breaker’s yard, on the grounds that it was too unwieldy. Despite being thought of as a far-southern group, I was able to hunt out a variety of targets from Northern England ! M47 was a large grouping of some 25 brighter stars which showed up well despite the Full Moon ...
N Brickhouse
... • How does the magnetic field evolve? • Do turbulent “hot spots” develop on more massive accretors? • What MHD processes drive stellar and/or disk outflows? • How does the magnetic field connect star and disk? Donati et al. 2008 ...
... • How does the magnetic field evolve? • Do turbulent “hot spots” develop on more massive accretors? • What MHD processes drive stellar and/or disk outflows? • How does the magnetic field connect star and disk? Donati et al. 2008 ...
Genesis of the Heaviest Elements in the Milky Way Galaxy
... capture elements are below the solar levels, the -capture element abundances in this star are the same as the solar system elemental -process-only abundances. This similarity in abundance levels has now been observed in several other halo stars (17). There is an additional, apparently rare, anom ...
... capture elements are below the solar levels, the -capture element abundances in this star are the same as the solar system elemental -process-only abundances. This similarity in abundance levels has now been observed in several other halo stars (17). There is an additional, apparently rare, anom ...
Formation of spiral and elliptical galaxies in a CDM cosmogony
... The attening of the halo (axial ratio 2:3) is too high to be a result of its rotation, i.e., it must be caused by the anisotropic velocity dispersion, while the attening of the bulge (axial ratio 1:1.3) is at least partially due to its rotation (v= 1). These results support the idea that disk ...
... The attening of the halo (axial ratio 2:3) is too high to be a result of its rotation, i.e., it must be caused by the anisotropic velocity dispersion, while the attening of the bulge (axial ratio 1:1.3) is at least partially due to its rotation (v= 1). These results support the idea that disk ...
Chapter15 (with interactive links)
... The stars in globular clusters in the halo have some heavy elements, so at least one prior generation of stars must have existed. Halo objects were formed before interstellar gas was all concentrated into the disk. Later star formation has been concentrated in the disk. ...
... The stars in globular clusters in the halo have some heavy elements, so at least one prior generation of stars must have existed. Halo objects were formed before interstellar gas was all concentrated into the disk. Later star formation has been concentrated in the disk. ...
Groups of Stars
... Spherical shape Generally older stars Surround the galaxy • Out of galaxy plane ...
... Spherical shape Generally older stars Surround the galaxy • Out of galaxy plane ...
A third red supergiant rich cluster in the Scutum
... (F06; D07), we find no maser emission from any cluster members which would also provide kinematic constraints (Verheyen et al. in prep.); thus we are forced to utilise photometric data to construct a list of candidate cluster members. Based on the spatial concentration of bright red stars, we start ...
... (F06; D07), we find no maser emission from any cluster members which would also provide kinematic constraints (Verheyen et al. in prep.); thus we are forced to utilise photometric data to construct a list of candidate cluster members. Based on the spatial concentration of bright red stars, we start ...
The Milky Way Galaxy
... public discussion between astronomers as to whether the Milky Way contains all the stars in the universe. Cepheid variable stars are important in determining the distance to other galaxies. Edwin Hubble proved that there are other galaxies far outside of the Milky Way. ...
... public discussion between astronomers as to whether the Milky Way contains all the stars in the universe. Cepheid variable stars are important in determining the distance to other galaxies. Edwin Hubble proved that there are other galaxies far outside of the Milky Way. ...
History of the 2.7 K Temperature Prior to Penzias and Wilson
... statement that the cosmic rays are dynamically important. They constitute a relativistic gas whose energy and pressure cannot be ignored. The near-equality of the various energy densities is probably no accident, but despite many attempts a full understanding of it has not yet been achieved. And aga ...
... statement that the cosmic rays are dynamically important. They constitute a relativistic gas whose energy and pressure cannot be ignored. The near-equality of the various energy densities is probably no accident, but despite many attempts a full understanding of it has not yet been achieved. And aga ...
PPT presentation
... Obtain additional data on SMC PNe: luminosity-limited sample Compare the nebular & stellar “evolutionary clocks” to understand the AGB->PN transition time Use the PN population as a tool to understand the early epoch of star formation of the host galaxy ...
... Obtain additional data on SMC PNe: luminosity-limited sample Compare the nebular & stellar “evolutionary clocks” to understand the AGB->PN transition time Use the PN population as a tool to understand the early epoch of star formation of the host galaxy ...
http://www.lanl.gov/orgs/adtsc/publications/science_highlights_2013/docs/Pg24_25.pdf
... progenitor that showed similar lightcurve characteristics and modified the wind profile to obtain a closer match. We also tried a smaller 15-Msun progenitor that was intended to be a II-P progenitor, but has a lightcurve that drops off much earlier than that observed for 2012aw. The best fit we have ...
... progenitor that showed similar lightcurve characteristics and modified the wind profile to obtain a closer match. We also tried a smaller 15-Msun progenitor that was intended to be a II-P progenitor, but has a lightcurve that drops off much earlier than that observed for 2012aw. The best fit we have ...
Summary of recent research activities
... abundance among galaxies in the local Universe (∼ 1/50 solar; Searle & Sargent 1972, ApJ 173, 25); however, the distance of the galaxy (> 10 Mpc) prevents the detection of the oldest stars and the issue is still open. Then at the end of the ’90s I realized that the Sagittarius dwarf irregular (dIrr) ...
... abundance among galaxies in the local Universe (∼ 1/50 solar; Searle & Sargent 1972, ApJ 173, 25); however, the distance of the galaxy (> 10 Mpc) prevents the detection of the oldest stars and the issue is still open. Then at the end of the ’90s I realized that the Sagittarius dwarf irregular (dIrr) ...
ChESS: ChaMP Extended Stellar Survey
... We present a atalog of stellar X-ray sour es serendipitously dete ted in Chandra data from 1999-2001 (XPIPE; Kim et al. 2004a,2004b). We have systemati ally sear hed for opti al mat hes to X-ray sour es from the Chandra Multi-wavelength Proje t (ChaMP; Green et al. 2004) using the Ty ho, GSC, SDSS, ...
... We present a atalog of stellar X-ray sour es serendipitously dete ted in Chandra data from 1999-2001 (XPIPE; Kim et al. 2004a,2004b). We have systemati ally sear hed for opti al mat hes to X-ray sour es from the Chandra Multi-wavelength Proje t (ChaMP; Green et al. 2004) using the Ty ho, GSC, SDSS, ...
BLANCO CARDENAS
... antigua casera Sharo. A aquellos que se fueron de Granada hace un tiempo, estoy feliz de que sean piezas de este rompecabezas con la Alhambra de fondo: gracias Juliane Serres, Ana Victoria Cuesta, Sebastian “Chingue” Meier, Lucı́a Piñeiro Freire, Lizette Duque, Ana Marı́a Salazar; sigo recordándol ...
... antigua casera Sharo. A aquellos que se fueron de Granada hace un tiempo, estoy feliz de que sean piezas de este rompecabezas con la Alhambra de fondo: gracias Juliane Serres, Ana Victoria Cuesta, Sebastian “Chingue” Meier, Lucı́a Piñeiro Freire, Lizette Duque, Ana Marı́a Salazar; sigo recordándol ...
Planetary nebula
A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives. The word ""nebula"" is Latin for mist or cloud and the term ""planetary nebula"" is a misnomer that originated in the 1780s with astronomer William Herschel because when viewed through his telescope, these objects appeared to him to resemble the rounded shapes of planets. Herschel's name for these objects was popularly adopted and has not been changed. They are a relatively short-lived phenomenon, lasting a few tens of thousands of years, compared to a typical stellar lifetime of several billion years.A mechanism for formation of most planetary nebulae is thought to be the following: at the end of the star's life, during the red giant phase, the outer layers of the star are expelled by strong stellar winds. Eventually, after most of the red giant's atmosphere is dissipated, the exposed hot, luminous core emits ultraviolet radiation to ionize the ejected outer layers of the star. Absorbed ultraviolet light energises the shell of nebulous gas around the central star, appearing as a bright coloured planetary nebula at several discrete visible wavelengths.Planetary nebulae may play a crucial role in the chemical evolution of the Milky Way, returning material to the interstellar medium from stars where elements, the products of nucleosynthesis (such as carbon, nitrogen, oxygen and neon), have been created. Planetary nebulae are also observed in more distant galaxies, yielding useful information about their chemical abundances.In recent years, Hubble Space Telescope images have revealed many planetary nebulae to have extremely complex and varied morphologies. About one-fifth are roughly spherical, but the majority are not spherically symmetric. The mechanisms which produce such a wide variety of shapes and features are not yet well understood, but binary central stars, stellar winds and magnetic fields may play a role.