Uv Astronomy Research Papers - Academia.edu (original) (raw)

The World Space Observatory for Ultraviolet (WSO–UV) is a space observatory equipped with instrumentation for spectroscopy and for imaging in the UV spectral range. After the Hubble Space Telescope, WSO–UV will be the largest mirror... more

The World Space Observatory for Ultraviolet (WSO–UV) is a space observatory equipped with instrumentation for spectroscopy and for imaging in the UV spectral range. After the Hubble Space Telescope, WSO–UV will be the largest mirror telescope for UV astronomy. Thus, the WSO-UV space observatory will guarantee continuity of UV observation of comets and exoplanets.

In this article we consider the prospects of research on comets and exoplanets using instruments onboard the WSO-UV mission. Ultraviolet spectroscopy at 115-310 nm is a powerful tool for studying comets, since this range of the... more

In this article we consider the prospects of research on comets and exoplanets using instruments onboard the WSO-UV mission. Ultraviolet spectroscopy at 115-310 nm is a powerful tool for studying comets, since this range of the electromagnetic spectrum contains most of the resonance lines of atoms, molecules and ions. The spectrographs on board the WSO-UV spacecraft will become one of the most important instruments for spectral studies of comets and exoplanets after 2025.

The parameterization of stars is a well-known problem and used for various purposes in astronomy. We have shown that multicolor photometric data from large modern surveys can be used for parameterization of stars. With sufficiently good... more

The parameterization of stars is a well-known problem and used for various purposes in astronomy. We have shown that multicolor photometric data from large modern surveys can be used for parameterization of stars. With sufficiently good quality photometry, one may compute a 3D extinction map by comparing catalogued multicolor photometry with photometry derived from the secondary estimators such as the distance modulus and the interstellar extinction law with suitable calibration tables for absolute magnitudes with reasonable spectral types, extinctions and distances.

Colibrì is a X-ray telescope which is currently in the concept study phase. The main objective of the Colibrì mission is to study the structure of accretion flows in the near vicinity of black holes and neutron stars and the study of... more

Colibrì is a X-ray telescope which is currently in the concept study phase. The main objective of the Colibrì mission is to study the structure of accretion flows in the near vicinity of black holes and neutron stars and the study of emission from the surface of neutron stars. With high spectral and time resolution, and high throughput, Colibrì will allow the study of accretion disks and coronae, including reflection and re-emission of radiation by the disk, and observations of isolated and accreting neutron stars. <br> <br> The Colibrì concept is based on multiple non-imaging X-ray collectors similar to NICER but with cryogenically cooled transition edge (TES) detectors for high energy resolution and sensitivity. Colibrì aims to achieve an energy resolution finer than 1eV at 2keV (3eV at 6keV), and count rates up to 100kHz, in an energy range of 0.1-10keV. The timing precision of Colibrì aims to be better than 1 micro-sec, matching the innermost orbital period for a 10 ...

NASA's Great Observatories have opened up the electromagnetic spectrum from space, providing sustained access to wavelengths not accessible from the ground. Together, Hubble, Compton, Chandra, and Spitzer have provided the scientific... more

NASA's Great Observatories have opened up the electromagnetic spectrum from space, providing sustained access to wavelengths not accessible from the ground. Together, Hubble, Compton, Chandra, and Spitzer have provided the scientific community with an agile and powerful suite of telescopes with which to attack broad scientific questions, and react to a rapidly changing scientific landscape. As the existing Great Observatories age, or are decommissioned, community access to these wavelengths will diminish, with an accompanying loss of scientific capability. This report, commissioned by the NASA Cosmic Origins, Physics of the Cosmos and Exoplanet Exploration Program Analysis Groups (PAGs), analyzes the importance of multi-wavelength observations from space during the epoch of the Great Observatories, providing examples that span a broad range of astrophysical investigations.

International audienceAstrophysics advances, in part, through laboratory astrophysics studies of the underlying processes controlling the observed properties of the Cosmos. These studies encompass both theoretical and experimental... more

International audienceAstrophysics advances, in part, through laboratory astrophysics studies of the underlying processes controlling the observed properties of the Cosmos. These studies encompass both theoretical and experimental research. Robust support for laboratory astrophysics is critically needed to maximize the scientific return of astronomical observations

As the Galaxies across Cosmic Time (GCT) panel is fully aware, the next decade will see major advances in our understanding of these areas of research. To quote from their charge, these advances will occur in studies of the formation,... more

As the Galaxies across Cosmic Time (GCT) panel is fully aware, the next decade will see major advances in our understanding of these areas of research. To quote from their charge, these advances will occur in studies of the formation, evolution, and global properties of galaxies and galaxy clusters, as well as active galactic nuclei and QSOs, mergers, star formation rate, gas accretion, and supermassive black holes. Central to the progress in these areas are the corresponding advances in laboratory astrophysics that are required for fully realizing the GCT scientific opportunities within the decade 2010-2020. Laboratory astrophysics comprises both theoretical and experimental studies of the underlying physics that produce the observed astrophysical processes. The 5 areas of laboratory astrophysics that we have identified as relevant to the CFP panel are atomic, molecular, solid matter, plasma, nuclear, and particle physics. In this white paper, we describe in Section 2 some of the n...

International audienceAstrophysics advances, in part, through laboratory astrophysics studies of the underlying processes controlling the observed properties of the Cosmos. These studies encompass both theoretical and experimental... more

International audienceAstrophysics advances, in part, through laboratory astrophysics studies of the underlying processes controlling the observed properties of the Cosmos. These studies encompass both theoretical and experimental research. Robust support for laboratory astrophysics is critically needed to maximize the scientific return of astronomical observations

This paper presents the concept of a community-accessible stratospheric balloon-based observatory that is currently under preparation by a consortium of European research institutes and industry. The planned European Stratospheric Balloon... more

This paper presents the concept of a community-accessible stratospheric balloon-based observatory that is currently under preparation by a consortium of European research institutes and industry. The planned European Stratospheric Balloon Observatory (ESBO) aims at complementing the current landscape of scientific ballooning activities by providing a service-centered infrastructure tailored towards broad astronomical use. In particular, the concept focuses on reusable platforms with exchangeable instruments and telescopes performing regular flights and an operations concept that provides researchers with options to test and operate own instruments, but later on also a proposal-based access to observations. It thereby aims at providing a complement to ground-, space-based, and airborne observatories in terms of access to wavelength regimes – particularly the ultraviolet (UV) and far infrared (FIR) regimes –, spatial resolution capability, and photometric stability. Within the current...

The interpretation of high-precision transit light curves of binary systems with exoplanets Kepler-5b, Kepler-6b, and Kepler-7b is performed for three different epochs. It has been demonstrated that the values of the stellar limb-darkening... more

The interpretation of high-precision transit light curves of binary systems with exoplanets Kepler-5b, Kepler-6b, and Kepler-7b is performed for three different epochs. It has been demonstrated that the values of the stellar limb-darkening coefficientsdiffer significantly for each epoch, while the geometric parameters for each epoch agree well with each other within the errormargin. It is shown that reliable determination of the limb-darkening coefficients requires methods that would “clear” theobserved transit light curves from effects caused by surface inhomogeneity.

The 905 to 1180 Å spectral range of the Far Ultraviolet Spectroscopic Explorer (FUSE) includes numerous transitions of molecular hydrogen, making it possible to study H2 in diffuse interstellar environments directly through absorption... more

The 905 to 1180 Å spectral range of the Far Ultraviolet Spectroscopic Explorer (FUSE) includes numerous transitions of molecular hydrogen, making it possible to study H2 in diffuse interstellar environments directly through absorption measurements. We have searched for H2 absorption in five starburst galaxies: NGC 1705, NGC 3310, NGC 4214, M83 (NGC 5236), and NGC 5253. We tentatively detect weak absorption by H2 in M83 and NGC 5253, and set upper limits on the H2 column density in the other galaxies. Conservative upper limits on the mass of molecular gas detected with FUSE are many orders of magnitude lower than the H2 mass inferred from CO emission measurements for the four galaxies in our sample in which CO has been detected. This indicates that almost all of the H2 is in the form of clouds with N(H2) � 10 20 cm −2 that are opaque to far-UV light and therefore cannot be probed with far-UV absorption measurements. The far-UV continuum visible in the FUSE spectra passes between the ...

There are only a handful of known short-period pre-main-sequence spectroscopic binaries with significant accretion rates (Class II sources). AK Sco stands out in this list because the system is composed of two equal mass F5 stars in a... more

There are only a handful of known short-period pre-main-sequence spectroscopic binaries with significant accretion rates (Class II sources). AK Sco stands out in this list because the system is composed of two equal mass F5 stars in a highly eccentric orbit thus both stars get as close as 11 stellar radii at periastron passage. This configuration is optimal for accretion studies because enhanced accretion events can be precisely timed at periastron passage. In this work, we present the results from the monitoring of the AK Sco system with Hubble during three consecutive periastron passages. These data provide a unique data set to spectroscopically characterize accretion and evaluate the intercycle variability of the system. Clear evidence of accretion rate enhancement was observed in cycles 1 and 3: the blueing of the near-UV continuum, the sudden flux increase of important accretion tracers, such as the N V, Si IV, and C IV lines, and also of neutral/singly ionized species such as ...