Astronomy Astrophysics
... X-3 in quiescence, at orbital phases 0.83 to 1.04. The 2.4–12 µm continuum radiation observed with ISOPHOT-S can be explained by thermal free-free emission in an expanding wind with, above 6.5 µm, a possible additional black-body component with temperature T ∼ 250 K and radius R ∼ 5000 R at 10 kpc, ...
... X-3 in quiescence, at orbital phases 0.83 to 1.04. The 2.4–12 µm continuum radiation observed with ISOPHOT-S can be explained by thermal free-free emission in an expanding wind with, above 6.5 µm, a possible additional black-body component with temperature T ∼ 250 K and radius R ∼ 5000 R at 10 kpc, ...
Multiwavelength optical observations of chromospherically active
... and excess emission in the blue wing of FG UMa was also detected. These features indicate that several dynamical processes, or a combination of them, may be involved. Using the EHα /EHβ ratio as a diagnostic we have detected prominence-like extended material viewed off the limb in many stars of the ...
... and excess emission in the blue wing of FG UMa was also detected. These features indicate that several dynamical processes, or a combination of them, may be involved. Using the EHα /EHβ ratio as a diagnostic we have detected prominence-like extended material viewed off the limb in many stars of the ...
H.E.S.S. observations of the binary system PSR B1259
... The class of very high energy (VHE; E > 100 GeV) γ-ray binaries comprises only a handful of known objects in our Galaxy: LS 5039 (Aharonian et al. 2005a), LS I +61 303 (Albert et al. 2006), PSR B1259-63/LS 2883 (Aharonian et al. 2005b) and HESS J0632+057 (Aharonian et al. 2007), the first binary pri ...
... The class of very high energy (VHE; E > 100 GeV) γ-ray binaries comprises only a handful of known objects in our Galaxy: LS 5039 (Aharonian et al. 2005a), LS I +61 303 (Albert et al. 2006), PSR B1259-63/LS 2883 (Aharonian et al. 2005b) and HESS J0632+057 (Aharonian et al. 2007), the first binary pri ...
space telescope imaging spectrograph survey of far
... and STIS observations 4 yr apart, which is apparently due to a substantial decline in the contribution from the G8 primary. We present an alternative model of the GHRS and STIS era profiles using information in the two sets of line shapes jointly, as well as knowledge of the behavior of Fe xxi profile ...
... and STIS observations 4 yr apart, which is apparently due to a substantial decline in the contribution from the G8 primary. We present an alternative model of the GHRS and STIS era profiles using information in the two sets of line shapes jointly, as well as knowledge of the behavior of Fe xxi profile ...
EUV and X-ray Spectroscopy of the Active Sun
... An investigation into the hydrodynamic evolution of a confined solar flare was carried out using RHESSI, CDS, GOES and TRACE. Evidence for pre-flare heating, explosive and gentle chromospheric evaporation and loop draining were observed in the data. The observations were compared to a 0-D hydrodynam ...
... An investigation into the hydrodynamic evolution of a confined solar flare was carried out using RHESSI, CDS, GOES and TRACE. Evidence for pre-flare heating, explosive and gentle chromospheric evaporation and loop draining were observed in the data. The observations were compared to a 0-D hydrodynam ...
determination of the distance to the galactic centre nigel clayton
... milliarc seconds per year, which is 4.50 x 10-16 radians per second. The dispersion in line-of-sight velocity was measured to be 112 km/s, which is 3.63 x 10-15 kpc/s. By assuming axisymmetry, these proper motion and velocity values are equivalent, hence 4.50 x 10-16 x Ro = 3.63 x 10-15 kpc/s, givin ...
... milliarc seconds per year, which is 4.50 x 10-16 radians per second. The dispersion in line-of-sight velocity was measured to be 112 km/s, which is 3.63 x 10-15 kpc/s. By assuming axisymmetry, these proper motion and velocity values are equivalent, hence 4.50 x 10-16 x Ro = 3.63 x 10-15 kpc/s, givin ...
An atlas of 2.4 to 4.1 mu m ISO/SWS spectra of early - UvA-DARE
... focal plane increased only slowly. Between 13 April and 10 May, spectra of nearly 250 bright stars were acquired for a stellar classification program. Referred to as “PostHelium observations”, this program aims at extending the MK classification scheme into the near-infrared. In this paper we presen ...
... focal plane increased only slowly. Between 13 April and 10 May, spectra of nearly 250 bright stars were acquired for a stellar classification program. Referred to as “PostHelium observations”, this program aims at extending the MK classification scheme into the near-infrared. In this paper we presen ...
Bright 22 μm excess candidates from the wise all-sky
... charted with the highest precision. Also, an auxiliary star mapper scanned many more stars with lower accuracy; these were included in the Tycho catalog of 1,058,332 stars. The Tycho 2 catalog, completed in 2000, brings the total to 2,539,913 stars, and most of the sources are bright stars with an a ...
... charted with the highest precision. Also, an auxiliary star mapper scanned many more stars with lower accuracy; these were included in the Tycho catalog of 1,058,332 stars. The Tycho 2 catalog, completed in 2000, brings the total to 2,539,913 stars, and most of the sources are bright stars with an a ...
Stellar activity in exoplanet hosts Enrique Herrero Casas
... have an expected rate of findings increased in a factor of 2 o 3 with respect to a search on the initial sample (Herrero et al. 2012). The high precision photometry provided by the space missions Kepler and CoRoT has allowed not only to discover several hundreds of exoplanetary systems, but also to s ...
... have an expected rate of findings increased in a factor of 2 o 3 with respect to a search on the initial sample (Herrero et al. 2012). The high precision photometry provided by the space missions Kepler and CoRoT has allowed not only to discover several hundreds of exoplanetary systems, but also to s ...
CONSTRAINING THE EVOLUTION OF ZZ CETI A. S. Mukadam
... Southwest Missouri State University, 901 S. National, Springfield, MO 65807, U.S.A. Information Technology Services, Southwestern University, Georgetown, TX 78626, U.S.A. ...
... Southwest Missouri State University, 901 S. National, Springfield, MO 65807, U.S.A. Information Technology Services, Southwestern University, Georgetown, TX 78626, U.S.A. ...
Polaris B, an optical companion of the Polaris (αUMi) system
... 43 and 83 arcsec, respectively), are also potential members of the multiple system (Fernie 1966), although recent observations refute that suggestion (Evans et al. 2007). It would therefore be interesting to establish the atmospheric parameters and chemical composition of component B for comparison ...
... 43 and 83 arcsec, respectively), are also potential members of the multiple system (Fernie 1966), although recent observations refute that suggestion (Evans et al. 2007). It would therefore be interesting to establish the atmospheric parameters and chemical composition of component B for comparison ...
as a PDF
... to be observed. There has been some controversy in the literature recently as to whether a disk model is appropriate to the higher mass counterparts of the T-Tauri stars: the Herbig Ae/Be stars. With this controversy in mind, and a search for such occluding effects, we present part of a comprehensiv ...
... to be observed. There has been some controversy in the literature recently as to whether a disk model is appropriate to the higher mass counterparts of the T-Tauri stars: the Herbig Ae/Be stars. With this controversy in mind, and a search for such occluding effects, we present part of a comprehensiv ...
William Herschel`s Wonderful Decade, 1781-1790
... however, was indeed the discovery of a nebula hitherto unknown to astronomers.24 The impression Herschel took away with him from the night’s viewing was that his sister, a novice observing with a telescope that was little more than a toy, had enlarged the number of nebulae known to science by two: e ...
... however, was indeed the discovery of a nebula hitherto unknown to astronomers.24 The impression Herschel took away with him from the night’s viewing was that his sister, a novice observing with a telescope that was little more than a toy, had enlarged the number of nebulae known to science by two: e ...
Asymptotic Giant Branch stars viewed up-close and far-off
... Universitetsservice, US-AB, Stockholm 2009 Department of Astronomy, Stockholm University ...
... Universitetsservice, US-AB, Stockholm 2009 Department of Astronomy, Stockholm University ...
An Atlas of Stellar Spectra
... and, in the case of the stars of earlier class, parallaxes from interstellar line intensities and from the effects of galactic rotation. Throughout the discussion emphasis will be laid on the “normal” stars. A number of peculiar objects are noted; but the main aim of the investigation has been to ma ...
... and, in the case of the stars of earlier class, parallaxes from interstellar line intensities and from the effects of galactic rotation. Throughout the discussion emphasis will be laid on the “normal” stars. A number of peculiar objects are noted; but the main aim of the investigation has been to ma ...
Imaging and spectroscopy of ejected common envelopes
... As the orbital inclination of the central star is _79° , it is likely that we are viewing this object in cross-section, and in some respects there is some resemblance between this nebula and the central parts of Abell 63. In fact, under suitable scaling the object takes on the appearance of a figure ...
... As the orbital inclination of the central star is _79° , it is likely that we are viewing this object in cross-section, and in some respects there is some resemblance between this nebula and the central parts of Abell 63. In fact, under suitable scaling the object takes on the appearance of a figure ...
TMT Science Overview - GSMT Program Office
... Bullock & Johnstone 2005). TMT.PSC.PRE.06.032.REL01 ...
... Bullock & Johnstone 2005). TMT.PSC.PRE.06.032.REL01 ...
State Environmental Planning Policy (Integration
... (b) the design of the proposed development, (c) the physical and heritage characteristics of the proposed site and surrounding land, (d) the availability of roads, utilities and other services, (e) the impact of the development on the environment and any present or future use of the land, (f) any ot ...
... (b) the design of the proposed development, (c) the physical and heritage characteristics of the proposed site and surrounding land, (d) the availability of roads, utilities and other services, (e) the impact of the development on the environment and any present or future use of the land, (f) any ot ...
Lithium abundances for 185 main-sequence stars
... Received 8 January 2001 / Accepted 7 March 2001 Abstract. We present a survey of lithium abundances in 185 main-sequence field stars with 5600 < ∼ Teff < ∼ 6600 K ...
... Received 8 January 2001 / Accepted 7 March 2001 Abstract. We present a survey of lithium abundances in 185 main-sequence field stars with 5600 < ∼ Teff < ∼ 6600 K ...
Pulsating Stars: Stars that Breathe
... Pulsating stars are a type of variable star in which brightness variations are caused by changes in the area and temperature of the star’s surface layers. Recent evidence suggests that all stars pulsate (if we measure them carefully enough), although the presence of concentrated populations of pulsa ...
... Pulsating stars are a type of variable star in which brightness variations are caused by changes in the area and temperature of the star’s surface layers. Recent evidence suggests that all stars pulsate (if we measure them carefully enough), although the presence of concentrated populations of pulsa ...
Chapter 2 The HRS+ Sample 2.1 The Herschel Reference Survey
... sitivity, high resolution images at 250, 350 and 500 µm, which will greatly improve current knowledge of the cold dust properties of nearby galaxies. To fully exploit the data delivered by Herschel, the observations will be combined with ancillary multiwavelength observations tracing the key compone ...
... sitivity, high resolution images at 250, 350 and 500 µm, which will greatly improve current knowledge of the cold dust properties of nearby galaxies. To fully exploit the data delivered by Herschel, the observations will be combined with ancillary multiwavelength observations tracing the key compone ...
Physics and Astronomy Course Descriptions
... Atomic, Nuclear and Particle Physics. A continued exploration of topics in modern physics including quantum statistics, nuclear physics, solid state physics and elementary particles. Four class hours per week. Prerequisite: PHY 211. 4 Semester Hours. PHY 322 Astrophysics. Introduction to radiative t ...
... Atomic, Nuclear and Particle Physics. A continued exploration of topics in modern physics including quantum statistics, nuclear physics, solid state physics and elementary particles. Four class hours per week. Prerequisite: PHY 211. 4 Semester Hours. PHY 322 Astrophysics. Introduction to radiative t ...
The XXL Survey - I. Scientific motivations − XMM
... Aims. We present the XXL Survey, the largest XMM programme totaling some 6.9 Ms to date and involving an international consortium of roughly 100 members. The XXL Survey covers two extragalactic areas of 25 deg2 each at a point-source sensitivity of ∼5 × 10−15 erg s−1 cm−2 in the [0.5−2] keV band (co ...
... Aims. We present the XXL Survey, the largest XMM programme totaling some 6.9 Ms to date and involving an international consortium of roughly 100 members. The XXL Survey covers two extragalactic areas of 25 deg2 each at a point-source sensitivity of ∼5 × 10−15 erg s−1 cm−2 in the [0.5−2] keV band (co ...
thesis
... have lead to the dawn of population studies of extrasolar planet systems. It is thought that this progress in instrumental techniques continues to flourish, leading possibly to the direct imaging of Earth-like planets, and planets not at all like our own, in the not too distant future. The work pres ...
... have lead to the dawn of population studies of extrasolar planet systems. It is thought that this progress in instrumental techniques continues to flourish, leading possibly to the direct imaging of Earth-like planets, and planets not at all like our own, in the not too distant future. The work pres ...
STEREO observations of long period variables
... The photometry is also conducted very slightly differently between the two imagers, using aperture photometry with different apertures (Bewsher et al. 2010). As a result, there are differences between the weighted mean magnitudes observed by the two satellites, with these systematics being greatest ...
... The photometry is also conducted very slightly differently between the two imagers, using aperture photometry with different apertures (Bewsher et al. 2010). As a result, there are differences between the weighted mean magnitudes observed by the two satellites, with these systematics being greatest ...
Indian Institute of Astrophysics
The Indian Institute of Astrophysics (IIA), with its headquarters in Bangalore (Karnataka state), India, is a premier national institute of India for the study of and research into topics pertaining to astronomy, astrophysics and related subjects.The Institute has a network of laboratories and observatories located in various places in India, including Kodaikanal (the Kodaikanal Solar Observatory), Kavalur (the Vainu Bappu Observatory), Gauribidanur, Hanle (the Indian Astronomical Observatory) and Hosakote.