Impact of atmospheric refraction: How deeply can we probe exo
... papers (Garcı́a Muñoz & Mills 2012; Garcı́a Muñoz et al. 2012; Bétrémieux & Kaltenegger 2013; Rodler & López-Morales 2014; Misra et al. 2014). At the top of the atmosphere, the ray from the star is undeflected. As the impact parameter of the rays decreases, the deflection of the rays increases. ...
... papers (Garcı́a Muñoz & Mills 2012; Garcı́a Muñoz et al. 2012; Bétrémieux & Kaltenegger 2013; Rodler & López-Morales 2014; Misra et al. 2014). At the top of the atmosphere, the ray from the star is undeflected. As the impact parameter of the rays decreases, the deflection of the rays increases. ...
Stars: Intro & Classification Astronomy 1 — Elementary Astronomy LA Mission College
... We intentionally do not suggest that there is a simple mechanism for accomplishing this and we avoid the concept of filters. ...
... We intentionally do not suggest that there is a simple mechanism for accomplishing this and we avoid the concept of filters. ...
Non-thermal hard X-ray emission from stellar coronae
... with RHESSI (rise times 60240 s, 103104 events in 100350 keV) Significant (13 ) polarization found in 5 cases, but large uncertainties and range of polarization degree (1060%) Independent analyses of a few flares observed with RHESSI and Coronal-F yield consistent results within uncertainties ...
... with RHESSI (rise times 60240 s, 103104 events in 100350 keV) Significant (13 ) polarization found in 5 cases, but large uncertainties and range of polarization degree (1060%) Independent analyses of a few flares observed with RHESSI and Coronal-F yield consistent results within uncertainties ...
Document
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
DUSTY CIRCUMSTELLAR DISKS B. Zuckerman
... range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or post T Tauri stars (e.g., Neuhäuser 1997). Such stars have been discovered be ...
... range, because such stars are hard to identify with IR and optical techniques. Recently, surveys of X-ray emission, especially with the German ROSAT satellite, have enabled detection of many stars that appear to be old or post T Tauri stars (e.g., Neuhäuser 1997). Such stars have been discovered be ...
Isotopic composition of Hg and Pt in 5 slowly rotating HgMn stars *
... neither extreme overabundances of rare earths, nor signicant overabundances of Si. Their spectral lines do not show conspicuous intensity variations. Neither have strong Send oprint requests to : G. Mathys ? Based on observations obtained at the European Southern Observatory, La Silla, Chile (ESO ...
... neither extreme overabundances of rare earths, nor signicant overabundances of Si. Their spectral lines do not show conspicuous intensity variations. Neither have strong Send oprint requests to : G. Mathys ? Based on observations obtained at the European Southern Observatory, La Silla, Chile (ESO ...
... of a quadratic pulsation ephemerides (a secularly decreasing period) and an orbital timing model which fits the O-C data within the photometry uncertainties (Saha & White 1990; Kiss et al. 1995; Wade et al. 1999). Wade et al. (1999) also show convincing evidence that the centre-of-mass velocities fo ...
Elliptical galaxies
... weaker more extended emission. A twist between both images of the same galaxy are apparent (the orientation in the sky is the same in ...
... weaker more extended emission. A twist between both images of the same galaxy are apparent (the orientation in the sky is the same in ...
Metal-poor Stars
... surface composition has not yet been significantly altered by any such mixing processes. The main indicator used to determine stellar metallicity is the iron abundance, [Fe/H], which is defined as [A/B]= log10 (NA/NB )? −log10(NA /NB ) for the number N of atoms of elements A and B, and refers to ...
... surface composition has not yet been significantly altered by any such mixing processes. The main indicator used to determine stellar metallicity is the iron abundance, [Fe/H], which is defined as [A/B]= log10 (NA/NB )? −log10(NA /NB ) for the number N of atoms of elements A and B, and refers to ...
5 Report of the Panel on Stars and Stellar Evolution
... millisecond pulsars are spinning much faster than when the neutron stars were formed, and it is understood how accretion in a binary system can make them accelerate, but the mechanism that limits how fast these neutron stars can whirl is not known. The answer is expected to come from new pulsar surv ...
... millisecond pulsars are spinning much faster than when the neutron stars were formed, and it is understood how accretion in a binary system can make them accelerate, but the mechanism that limits how fast these neutron stars can whirl is not known. The answer is expected to come from new pulsar surv ...
Luminosity, Flux and Magnitudes Outline
... The constant of proportionality is not quite the S-B constant because we need to integrate over all solid angles to get it (which gives an additional factor of ). The integral is related to the Riemann zeta function giving ...
... The constant of proportionality is not quite the S-B constant because we need to integrate over all solid angles to get it (which gives an additional factor of ). The integral is related to the Riemann zeta function giving ...
Robert_Minchin_Galaxies_2011_REU
... tells us how gas-rich a galaxy is. – Gas-rich galaxies are often blue, late-type galaxies with active star formation. – Some are more intriguing objects with low SF rates. A number of these have been turned up by HI surveys. ...
... tells us how gas-rich a galaxy is. – Gas-rich galaxies are often blue, late-type galaxies with active star formation. – Some are more intriguing objects with low SF rates. A number of these have been turned up by HI surveys. ...
- ANU Repository
... smaller value. Importantly, MIMC does not require binning, which may blur important features in a distribution. Gaidos et al. (2014) used MIMC to estimate an occurrence f of 2.0 ± 0.3 for 1–4 R⊕ planets with orbital periods P < 180 d, a radius distribution that peaks at ∼1 R⊕ and a period distributi ...
... smaller value. Importantly, MIMC does not require binning, which may blur important features in a distribution. Gaidos et al. (2014) used MIMC to estimate an occurrence f of 2.0 ± 0.3 for 1–4 R⊕ planets with orbital periods P < 180 d, a radius distribution that peaks at ∼1 R⊕ and a period distributi ...
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 ...
PowerPoint Presentation - Isolated Neutron Stars, solid crust
... Thermal Emission from Isolated Neutron Stars: Spectral Features and Featureless Spectra Silvia Zane, MSSL, UCL, UK Congresso Nazionale Oggetti Compatti ||| Osservatorio Astronomico di Roma, 9-11 Dicembre 2003 ...
... Thermal Emission from Isolated Neutron Stars: Spectral Features and Featureless Spectra Silvia Zane, MSSL, UCL, UK Congresso Nazionale Oggetti Compatti ||| Osservatorio Astronomico di Roma, 9-11 Dicembre 2003 ...
Schmidt-Cassegrain Optical Tube Assembly
... The Schmidt-Cassegrain focusing mechanism controls the primary mirror which is mounted on a ring that slides back and forth on the primary baffle tube. The focusing knob, which moves the primary mirror, is on the rear cell of the telescope just below the star diagonal and eyepiece. Turn the focusing ...
... The Schmidt-Cassegrain focusing mechanism controls the primary mirror which is mounted on a ring that slides back and forth on the primary baffle tube. The focusing knob, which moves the primary mirror, is on the rear cell of the telescope just below the star diagonal and eyepiece. Turn the focusing ...
Astronomy 250 - University of Victoria
... A difficult task in astronomy is to determine the distances to various astronomical targets. For nearby objects, simple geometric methods can be used to find fairly accurate distances. Annual Parallax The first efforts by the Greeks to measure stellar distances were largely frustrated by inaccurate ...
... A difficult task in astronomy is to determine the distances to various astronomical targets. For nearby objects, simple geometric methods can be used to find fairly accurate distances. Annual Parallax The first efforts by the Greeks to measure stellar distances were largely frustrated by inaccurate ...
24.1 Hubble`s Galaxy Classification
... 24.2 The Distribution of Galaxies in Space In order to find how galaxies are distributed in the universe, we have to be able to estimate their distances. We therefore need to understand which “standard candles” can be used for this purpose. Recall that RR Lyrae variables allowed us to get distances ...
... 24.2 The Distribution of Galaxies in Space In order to find how galaxies are distributed in the universe, we have to be able to estimate their distances. We therefore need to understand which “standard candles” can be used for this purpose. Recall that RR Lyrae variables allowed us to get distances ...
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.