Period analysis of variable stars by robust smoothing
... minimizes the GCV score. However, with the recognition that a smoothing spline and thus the related GCV score are affected by outliers, we suggest a robust modification. In the robust cross-validation (RCV) method, we estimate the period to minimize the RCV score induced by a robust smoothing spline ...
... minimizes the GCV score. However, with the recognition that a smoothing spline and thus the related GCV score are affected by outliers, we suggest a robust modification. In the robust cross-validation (RCV) method, we estimate the period to minimize the RCV score induced by a robust smoothing spline ...
On the Spiral Structure of the Milky Way Galaxy
... HII regions are located along spiral arms and often concentrated in giant star and gas complexes [5, 6]. The complexes in the spiral arms related to the all-Galaxy density wave probably are formed with magneto-gravitational instability due to regular magnetic field directed along the arm. Observatio ...
... HII regions are located along spiral arms and often concentrated in giant star and gas complexes [5, 6]. The complexes in the spiral arms related to the all-Galaxy density wave probably are formed with magneto-gravitational instability due to regular magnetic field directed along the arm. Observatio ...
Galaxies - University of Iowa Astrophysics
... B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
... B) Their luminosity can be determined from their pulsation period. C) They all have the same luminosity. D) They all have the same radius. ...
Distance determination for RAVE stars using stellar models
... The future prospects for distance determinations are very promising. In the next decade the Gaia satellite (Perryman et al. 2001) will observe up to 109 stars with exquisite astrometric precision. The mission is due to start in 2012, but a final data release will not arrive until near the end of the ...
... The future prospects for distance determinations are very promising. In the next decade the Gaia satellite (Perryman et al. 2001) will observe up to 109 stars with exquisite astrometric precision. The mission is due to start in 2012, but a final data release will not arrive until near the end of the ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
The Final Version of the White Paper is available.
... The characterization of exoplanets is one of the outstanding key science cases for HIRES. The focus will be on characterizing exo-planet atmospheres over a wide range of masses, from Neptune-like down to Earth-like including those in the habitable zones, in terms of chemical composition, stratificat ...
... The characterization of exoplanets is one of the outstanding key science cases for HIRES. The focus will be on characterizing exo-planet atmospheres over a wide range of masses, from Neptune-like down to Earth-like including those in the habitable zones, in terms of chemical composition, stratificat ...
- StealthSkater
... Let's suppose we wanted to make out own map of a trip to the stars. We will limit ourselves to the 55 light-year radius covered by the detailed star catalogs. The purpose of the trip will be to search for intelligent life on planets that may be in orbit around these stars. We would want to include e ...
... Let's suppose we wanted to make out own map of a trip to the stars. We will limit ourselves to the 55 light-year radius covered by the detailed star catalogs. The purpose of the trip will be to search for intelligent life on planets that may be in orbit around these stars. We would want to include e ...
Ptolemy: on trial for fraud
... ever, contains 1022 stars. Dreyer and others tury, and also by Delambre. Was Ptolemy the betraying the ethics and integrity of his profesconcluded that more stars must have been greatest astronomer of antiquity, or the greatsion. The Almagest had “done more damage to added after Hipparchus, presumab ...
... ever, contains 1022 stars. Dreyer and others tury, and also by Delambre. Was Ptolemy the betraying the ethics and integrity of his profesconcluded that more stars must have been greatest astronomer of antiquity, or the greatsion. The Almagest had “done more damage to added after Hipparchus, presumab ...
Nucleosynthesis and Chemical Evolution of Oxygen
... convection using routines written by Jordan et al. (2004). The star began with a mass 25 times greater than that of the Sun. By the end of its life, it had lost 3.4 solar masses of material due to stellar winds. The model ran through silicon burning. Energy was then deposited in the core. Shock prop ...
... convection using routines written by Jordan et al. (2004). The star began with a mass 25 times greater than that of the Sun. By the end of its life, it had lost 3.4 solar masses of material due to stellar winds. The model ran through silicon burning. Energy was then deposited in the core. Shock prop ...
Carbon, nitrogen, oxygen and lithium abundances of six
... et al. 1993), together with the mean abundance for the Supernovae Remnants (Russell and Dopita 1990) and for the H II regions (Dufour 1984; Garnett et al. 1995). It should be noted that the more recent abundance determination of the Clouds’ H II regions performed by Russell and Dopita (1990) gave re ...
... et al. 1993), together with the mean abundance for the Supernovae Remnants (Russell and Dopita 1990) and for the H II regions (Dufour 1984; Garnett et al. 1995). It should be noted that the more recent abundance determination of the Clouds’ H II regions performed by Russell and Dopita (1990) gave re ...
Mathematica - Press Center
... Planet Plots: Planet plotting is done in two- and three-dimensional forms. Surface features for the Earth, the Moon, Mars, and Jupiter are shown on the plots. Moons and their shadows are displayed for the Earth and Jupiter. Related functions allow you to produce planet position finder charts and pla ...
... Planet Plots: Planet plotting is done in two- and three-dimensional forms. Surface features for the Earth, the Moon, Mars, and Jupiter are shown on the plots. Moons and their shadows are displayed for the Earth and Jupiter. Related functions allow you to produce planet position finder charts and pla ...
The Witness of the Stars
... the ancient names of over a hundred of the principal stars which have been handed down; but now these names are used merely as a convenience, and without any reference to their significance. This work is an attempt to popularize this ancient information, and to use it in the interest of truth. For t ...
... the ancient names of over a hundred of the principal stars which have been handed down; but now these names are used merely as a convenience, and without any reference to their significance. This work is an attempt to popularize this ancient information, and to use it in the interest of truth. For t ...
Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... metallicities, similar to ω Cen. The spread in these probable nuclear star clusters exceeds those of most GCs: these massive clusters are located in a region intermediate between normal GCs and dwarf galaxies. The GC M 54 exibits a Na-O anticorrelation, a typical signature of GCs, which is instead a ...
... metallicities, similar to ω Cen. The spread in these probable nuclear star clusters exceeds those of most GCs: these massive clusters are located in a region intermediate between normal GCs and dwarf galaxies. The GC M 54 exibits a Na-O anticorrelation, a typical signature of GCs, which is instead a ...
Evidence for the Tidal Destruction of Hot Jupiters by Subgiant Stars
... The latter scenario, attributing the differences to stellar mass, is generally favored in the literature. It is supported by the results of fitting stellar-evolutionary models to the observable properties of the evolved stars (their luminosities, surface gravities, and effective temperatures), which ...
... The latter scenario, attributing the differences to stellar mass, is generally favored in the literature. It is supported by the results of fitting stellar-evolutionary models to the observable properties of the evolved stars (their luminosities, surface gravities, and effective temperatures), which ...
1. INTRODUCTION - Institut für Theoretische Astrophysik
... We calculate time-dependent models of acoustically heated chromospheres for main-sequence stars between spectral type F0 V and M0 V and for two giants of spectral type K0 III and K5 III assuming monochromatic waves. The hydrodynamic equations are solved together with the radiative transfer and stati ...
... We calculate time-dependent models of acoustically heated chromospheres for main-sequence stars between spectral type F0 V and M0 V and for two giants of spectral type K0 III and K5 III assuming monochromatic waves. The hydrodynamic equations are solved together with the radiative transfer and stati ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... high a temperature as possible. The basic goal is a statistically complete survey of stars on or near the BHB across all temperatures where they occur, from 7250 K to 35,000 K. We aim for the same degree of completeness for all BHB stars, regardless of their temperature and metallicity. Such a surve ...
... high a temperature as possible. The basic goal is a statistically complete survey of stars on or near the BHB across all temperatures where they occur, from 7250 K to 35,000 K. We aim for the same degree of completeness for all BHB stars, regardless of their temperature and metallicity. Such a surve ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.