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 ...
A Method of Correcting Near-Infrared Spectra for Telluric Absorption
... in their observed spectra. However, since atmospheric absorption features are certainly present at the locations of most of these lines, this method can lead to uncertainties in the reality of any features subsequently detected in the corrected object’s spectrum at or near the wavelengths of the ste ...
... in their observed spectra. However, since atmospheric absorption features are certainly present at the locations of most of these lines, this method can lead to uncertainties in the reality of any features subsequently detected in the corrected object’s spectrum at or near the wavelengths of the ste ...
Mathematica - Press Center
... All rights reserved. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechani cal, photocopying, recording or otherwise, without the prior written permission of the author Terry Robb and Wolfram Research, Inc. Stellar S ...
... All rights reserved. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechani cal, photocopying, recording or otherwise, without the prior written permission of the author Terry Robb and Wolfram Research, Inc. Stellar S ...
Discovery and spectroscopy of the young Jovian planet
... 51 Eri b and the GJ 3305 binary form a hierarchical triple configuration (28), but the companion pair is far enough away that the planet is expected to be dynamically stable in its current orbit (13). Moreover, the young age of the system suggests that while long-term dynamical effects such as secul ...
... 51 Eri b and the GJ 3305 binary form a hierarchical triple configuration (28), but the companion pair is far enough away that the planet is expected to be dynamically stable in its current orbit (13). Moreover, the young age of the system suggests that while long-term dynamical effects such as secul ...
TWO NEW LONG-PERIOD GIANT PLANETS FROM THE
... Key words: planetary systems – stars: activity – techniques: radial velocities Supporting material: machine-readable tables The RV technique has been used to detect/discover ∼600 of the ∼2000 known, confirmed exoplanets. Since the technique is heavily biased toward massive planets in short-period orb ...
... Key words: planetary systems – stars: activity – techniques: radial velocities Supporting material: machine-readable tables The RV technique has been used to detect/discover ∼600 of the ∼2000 known, confirmed exoplanets. Since the technique is heavily biased toward massive planets in short-period orb ...
A Digital Spectral Classification Atlas
... Figure 11: The spectra of three helium-weak B-type stars compared with two MK standards. Spectra adapted from the Paranal Observatory spectral library, from the Indo-US coudé-feed library and from DSO. The star, 3 Sco, is an excellent example of a helium-weak B-type star. The hydrogen lines of this ...
... Figure 11: The spectra of three helium-weak B-type stars compared with two MK standards. Spectra adapted from the Paranal Observatory spectral library, from the Indo-US coudé-feed library and from DSO. The star, 3 Sco, is an excellent example of a helium-weak B-type star. The hydrogen lines of this ...
- National Optical Astronomy Observatory
... limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0.4 arcseconds would then be about right under good seeing.) ! Input scan parameters (number of steps, number of spectral frames, integration time, etc.) ! Start the scan sequence and simultaneously begin stepping the tra ...
... limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0.4 arcseconds would then be about right under good seeing.) ! Input scan parameters (number of steps, number of spectral frames, integration time, etc.) ! Start the scan sequence and simultaneously begin stepping the tra ...
azu_etd_13224_sip1_m
... wanted during this time. I was also supported during the summer by Dr. Griffith’s NASA’s Planetary Atmospheres Program grant, and during this last year by a NASA Keck PI grant. In addition, my thesis was possible due to the data available in the Keck Observatory Archive (KOA), operated by the W. M. ...
... wanted during this time. I was also supported during the summer by Dr. Griffith’s NASA’s Planetary Atmospheres Program grant, and during this last year by a NASA Keck PI grant. In addition, my thesis was possible due to the data available in the Keck Observatory Archive (KOA), operated by the W. M. ...
Hunting for Substructure in the Milky Way
... this orbit remains approximately circular. Astronomers measure the velocity and distances of stars to analyse the angular momentum, and from this they can determine how circular the orbit of each star is. In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has e ...
... this orbit remains approximately circular. Astronomers measure the velocity and distances of stars to analyse the angular momentum, and from this they can determine how circular the orbit of each star is. In previous years, astronomers had a simple outlook on the structure of our Galaxy, which has e ...
Search for an exosphere around 51 Pegasi B with ISO
... HD 168443 (G5) and HD 114762 (F9V). None of the stars have been observed to have photometric variations compatible with planetary eclipses. Only recently a transit event has been observed in HD209458 (G0V) (Henry et al. 1999). Evolution models predict that the planetary companions are able to surviv ...
... HD 168443 (G5) and HD 114762 (F9V). None of the stars have been observed to have photometric variations compatible with planetary eclipses. Only recently a transit event has been observed in HD209458 (G0V) (Henry et al. 1999). Evolution models predict that the planetary companions are able to surviv ...
Altas Farnese
... suggesting a date of c. 128 A.D. Third, art historians all point to the original Greek sculptor as using the constellations based in Aratus’s poem Phaenomena, which has a date of c. 275 B.C. An origin with Aratus was the dominant opinion amongst scholarly publications in the last century. Fourth, we ...
... suggesting a date of c. 128 A.D. Third, art historians all point to the original Greek sculptor as using the constellations based in Aratus’s poem Phaenomena, which has a date of c. 275 B.C. An origin with Aratus was the dominant opinion amongst scholarly publications in the last century. Fourth, we ...
N-Body/SPH simulations of induced star formation in dwarf galaxies
... First of all, I want to thank professor Sven De Rijcke. Offering the vastly interesting subject and supervising patiently, I always felt inspired after leaving his office. I am also greatful for his effort to hand in an FWO project for me, even when at the time, my thesis was rather unexisting still ...
... First of all, I want to thank professor Sven De Rijcke. Offering the vastly interesting subject and supervising patiently, I always felt inspired after leaving his office. I am also greatful for his effort to hand in an FWO project for me, even when at the time, my thesis was rather unexisting still ...
Element Segregation in Low Metallicity Stars and the Primordial
... which depends on the effective temperature, the age and the metallicity of the stars. This prediction is in contradiction with the observations of the lithium plateau in Pop II stars. However, as discussed above, the lithium profiles in the standard models present a maximum (Limax ) which remains re ...
... which depends on the effective temperature, the age and the metallicity of the stars. This prediction is in contradiction with the observations of the lithium plateau in Pop II stars. However, as discussed above, the lithium profiles in the standard models present a maximum (Limax ) which remains re ...
Red supergiants around the obscured open cluster Stephenson 2
... (cf. Messineo et al. 2012), this cut selects most RSGs, while leaving out low-luminosity red stars. The vast majority of our targets present a good quality flag (Qflg = A, B, C, or D) in all three 2MASS bands. A few objects with other quality flags were included in the sample and assigned low priori ...
... (cf. Messineo et al. 2012), this cut selects most RSGs, while leaving out low-luminosity red stars. The vast majority of our targets present a good quality flag (Qflg = A, B, C, or D) in all three 2MASS bands. A few objects with other quality flags were included in the sample and assigned low priori ...
Evolution in circumstellar envelopes of Be stars: From disks to rings?
... disks of several Be stars. Subtle variations in the wings of optically thin and thick emission lines suggest that the conventional, static picture of the disk being in quasi-contact with the central star is justified primarily (or perhaps only) after an outburst event. Some weeks to months later, a ...
... disks of several Be stars. Subtle variations in the wings of optically thin and thick emission lines suggest that the conventional, static picture of the disk being in quasi-contact with the central star is justified primarily (or perhaps only) after an outburst event. Some weeks to months later, a ...
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence
... universe now, and their masses range from hundreds of million to maybe trillion solar masses, containing up to couple of hundred billion stars. [slide 3] The first thing that any empirical ...
... universe now, and their masses range from hundreds of million to maybe trillion solar masses, containing up to couple of hundred billion stars. [slide 3] The first thing that any empirical ...
Pyramid of Cheops and its Secret I
... construction line at ground level only deviates by three centimeters. Yet the pyramid is constructed with blocks of stone of enormous dimensions. It took, according to Herodotus, 20 years to finish the construction. It has been estimated that 35 blocks of stone must have been put in place per hour. ...
... construction line at ground level only deviates by three centimeters. Yet the pyramid is constructed with blocks of stone of enormous dimensions. It took, according to Herodotus, 20 years to finish the construction. It has been estimated that 35 blocks of stone must have been put in place per hour. ...
Jul 2016 - Bays Mountain Park
... is commonly represented as the God Apollo grasping a snake that is represented by the constellation Serpens. Ophiuchus was one of the 48 constellations listed by the astronomer Ptolemy. It is also one of the 88 modern constellations. The most well-known star in this constellation is Barnard's Star. ...
... is commonly represented as the God Apollo grasping a snake that is represented by the constellation Serpens. Ophiuchus was one of the 48 constellations listed by the astronomer Ptolemy. It is also one of the 88 modern constellations. The most well-known star in this constellation is Barnard's Star. ...
Comets, historical records and vedic literature
... northern hemisphere, Canopus is visible during the winter season from regions south of 37 degree latitude. Agastya, a seer who composed around 27 hymns of Rigveda (Mahadevan, 1986), is associated with Alpha Carinae since about 600 BC (Ghurye, 1977). There is also a hymn in Rigveda likely to be due t ...
... northern hemisphere, Canopus is visible during the winter season from regions south of 37 degree latitude. Agastya, a seer who composed around 27 hymns of Rigveda (Mahadevan, 1986), is associated with Alpha Carinae since about 600 BC (Ghurye, 1977). There is also a hymn in Rigveda likely to be due t ...
Carbon-enhanced metal-poor stars in dwarf galaxies
... Understanding the nature of the first stars is one of the key questions of modern Cosmology. Despite extensive observational searches, truly pristine stars have so far escaped detection. Currently, the most metal-deficient star known has a total metallicity of Z ≈ 6.9 × 10−7 (Caffau et al. 2011). Th ...
... Understanding the nature of the first stars is one of the key questions of modern Cosmology. Despite extensive observational searches, truly pristine stars have so far escaped detection. Currently, the most metal-deficient star known has a total metallicity of Z ≈ 6.9 × 10−7 (Caffau et al. 2011). Th ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.