- ID:
- ivo://CDS.VizieR/J/A+A/653/A83
- Title:
- UVB/NIR spectroscopy GRB hosts
- Short Name:
- J/A+A/653/A83
- Date:
- 22 Feb 2022
- Publisher:
- CDS
- Description:
- We present the updated census and statistics of Lyman-alpha emitting long gamma-ray bursts host galaxies (LAE-LGRBs). We investigate the properties of a sub-sample of four LAE-LGRBs (GRBs: 011211, 021004, 060926, 070110). The combined observations of their afterglow and host galaxy allow us to test the shell model commonly used to fit Lyman-alpha emission line spectra.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/III/39A
- Title:
- UV Bright Star Spectrophotometric Catalog
- Short Name:
- III/39A
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue contains observations carried out by the S2/68 Ultraviolet Sky Survey Telescope (UVSST) aboard the ESRO Satellite TD-1, which measured the absolute ultraviolet flux distribution between 2740A (274nm) and 1350A (135nm). The data presented in this catalogue were obtained during the first observation period, which lasted from 19 March 1972 to 31 October 1972, and contains the brightest objects, for which the signal is good enough to give valuable spectrophotometric information. The Faint Star Catalogue, which contains the photometric data of the stars up to the limit of detectability of the instrument, is known as the "Catalogue of Ultraviolet Fluxes", by Thompson et al. (catalog <II/59>) The S2/68 experiment has been described by Boksenberg et al. (=1973MNRAS.163..291B) and the absolute calibration by Humphries et al. (=1976A&A....49..389H).
2963. UVES sky atlas
- ID:
- ivo://CDS.VizieR/J/A+A/407/1157
- Title:
- UVES sky atlas
- Short Name:
- J/A+A/407/1157
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- These tables list positions, widths and peak fluxes for the sky emission lines. The listings follow the subdivision in settings which is followed throughout the text and listed in Table 3.
- ID:
- ivo://CDS.VizieR/J/A+A/643/A22
- Title:
- UVES spectra of Feige 46 and LSIV -14 116
- Short Name:
- J/A+A/643/A22
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Hot subdwarf stars of spectral types O and B represent a poorly understood phase in the evolution of low-mass stars, in particular of close compact binaries. A variety of phenomena are observed, which make them important tools for several astronomical disciplines. For instance, the richness of oscillations of many subdwarfs are important for asteroseismology. Furthermore, hot subdwarfs are among the most chemically peculiar stars known. Two intermediate He-rich hot subdwarf stars, LSIV -14 116 and Feige 46, are particularly interesting, because they show extreme enrichments of heavy elements such as Ge, Sr, Y, and Zr, strikingly similar in both stars. In addition, both stars show light oscillations at periods incompatible with standard pulsation theory and form the class of V366 Aqr variables. We investigate whether the similar chemical compositions extend to more complete abundance patterns in both stars and validate the pulsations in Feige 46 using its recent TESS light curve. High-resolution optical and near-ultraviolet spectroscopy are combined with non-local-thermodynamical-equilibrium model atmospheres and synthetic spectra calculated with Tlusty and Synspec to determine detailed metal abundance patterns in both stars consistently. Many previously unidentified lines are identified for the first time with transitions originating from GaIII, GeIII-IV, SeIII, KrIII, SrII-III, YIII, ZrIII-IV, and SnIV, most of which have not been observed so far in any star. The abundance patterns of 19 metals in both stars are almost identical, light metals being only slightly more abundant in Feige 46 while Zr, Sn, and Pb are slightly less enhanced compared to LSIV -14 116. Both abundance patterns are distinctively different from those of normal He-poor hot subdwarfs of similar temperature. The extreme enrichment in heavy metals of more than 4 dex compared to the Sun is likely the result of strong atmospheric diffusion processes that operate similarly in both stars while their similar patterns of C, N, O, and Ne abundances might provide clues to their as yet unclear evolutionary history. Finally, we find that the periods of the pulsation modes in Feige 46 are stable to better than dP/dt~=10^-8^s/s. This is is not compatible with dP/dt predicted for pulsations driven by the epsilon-mechanism and excited by helium-shell flashes in a star which is evolving, for example, onto the extended horizontal branch.
- ID:
- ivo://CDS.VizieR/J/A+A/370/426
- Title:
- UVES Spectrum of APM BR J0307-4945
- Short Name:
- J/A+A/370/426
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the first high-resolution (6.2 to 7.7km/s FWHM) spectra of the APM BR J0307-4945 quasar at z_em_=4.73 obtained with UVES on the 8.2m VLT Kueyen telescope. We focus our analysis on a damped Lyman-{alpha} system at z_abs_=4.466, the most distant DLA system known to the present date, observed when the age of the universe was only 1.3Gyr. The following table lists the wavelengths and equivalent widths for all absorption-line features (except the telluric lines) redwards of the quasar Ly-{alpha} emission detected at 4{sigma} in equivalent width. The transition names and approximate redshifts are specified for the features we successfully identified. About 80% of the absorption lines redwards of the quasar Ly-{alpha} emission have been identified, corresponding to 13 metal-line systems.
- ID:
- ivo://CDS.VizieR/J/A+A/562/A34
- Title:
- UV FeII template from LBQS 2113-4538
- Short Name:
- J/A+A/562/A34
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- MgII line is of extreme importance for intermediate quasars since it allows to measure the black hole mass in these sources and to use them as probes of the distribution of dark energy in the Universe, as a complementary tool to SN Ia. Reliable use of MgII requires good understanding of all systematic effects involved in the measurement of the line properties, including the contamination by FeII UV emission.
- ID:
- ivo://CDS.VizieR/J/A+A/317/712
- Title:
- UV fluxes and electron density of AG Peg
- Short Name:
- J/A+A/317/712
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- In this paper we study in detail the variability of the symbiotic nova AG Peg in the IUE range during the period 1978-1995. We find that the luminosity of the hot component decreased steadily from about 1850L_{sun}_ in 1978 to 430L_{sun}_ in 1995 while its effective temperature remained nearly constant, 86500+/-1300K. At the same time, the mass loss rate decreased by a factor of 4-5 although the ejection velocity remained constant. The observed fainting of both the narrow and the broad emission lines is ascribed to the decrease of the luminosity and ionizing flux from the hot source. The narrow emission lines and the long wavelength UV continuum show periodic variations arising from a dense and asymmetric nebular region associated with the cool star. Radial velocity variations of the narrow lines indicate that this region is receding from the center of mass of the system, and support the presence of the ablation tail suggested by Penston and Allen (1985MNRAS.212..939P). No periodic flux variations are seen in the short wavelength ultraviolet continuum and in the broad emission lines, which are both formed in the fast wind from the hot component.
2968. UVILLSS Catalogue
- ID:
- ivo://CDS.VizieR/VI/84
- Title:
- UVILLSS Catalogue
- Short Name:
- VI/84
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This catalogue is an extension in the ultraviolet region (129 to 3903 Angstroems) of the ILLSS catalogue (Coluzzi, 1993; catalog <VI/71>) which lists lines in the optical region. The data are from "Ultraviolet Multiplet Table" (Moore 1950, 1952, 1962) and arranged in two files: the catalogue and the references. There are two versions of each file, one presented in the author's original format, and the second organised as a table. The reference files are arranged by element: for each spectrum the first line contains within parenthesis the Ionization Potential; the grade of analysis; the grade denoting the relative number of classified lines included as compared with the total number classified in the ultraviolet; the date of completion of the manuscript; the limit for three spectra H, He I, He II. The limit in cm-1 has been multiplied by the factor 0.00012345 to obtain the tabulated ionisation potential, which is expressed in electron-Volts. The analysis grades range from A to E, grade A indicating that the analysis is essentially complete ,and grade E that the structure has been recognised, but is limited to a single multiplet or transition. List A, List B, etc., denote the relative numbers of classified lines listed here as compared with the total number classified in the ultraviolet, A denoting that all classified lines in the ultraviolet are listed, and D that only a few of the leading ones are tabulated. The letters on the left, A, B, C, etc. preceding the reference, indicate the source used for the wavelength quoted in the Table. Those papers used only for analysis or intensity follow the ones used for wavelength, and are not preceded by the letters denoting the source. The letters "WL", "I", "T", indicating what was taken from each paper for the Table compilation , denote, respectively, wavelength, intensity, and terms, the last referring to the analysis of the spectrum. These informations are taken from Moore (1950).
2969. 4U 0614+091 VLT spectrum
- ID:
- ivo://CDS.VizieR/J/A+A/572/A99
- Title:
- 4U 0614+091 VLT spectrum
- Short Name:
- J/A+A/572/A99
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a polarimetric and spectroscopic study of the persistent ultra-compact X-ray binary 4U 0614+091 aimed at searching for the emission of a relativistic particle jet and at unveiling the orbital period Porb of the system. We obtained r-band polarimetric observations with the Telescopio Nazionale Galileo (TNG) equipped with the PAOLO polarimeter and with the Nordic Optical Telescope (NOT) equipped with the ALFOSC instrument, covering ~2h and ~0.5h observations, respectively. We carried out low resolution spectroscopy of the system using the ESO Very Large Telescope equipped with FORS1 for ~1.5h (16 spectra covering the range 4300-8000{AA}).
- ID:
- ivo://CDS.VizieR/J/ApJS/173/441
- Title:
- UV-Luminous galaxies discovered by GALEX
- Short Name:
- J/ApJS/173/441
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on the properties of a sample of ultraviolet-luminous galaxies (UVLGs) selected by matching the Galaxy Evolution Explorer (GALEX) All-Sky Imaging and Medium Imaging Surveys with the Sloan Digital Sky Survey third data release. The overlap between these two surveys is roughly 450deg^2^. Of 25362 galaxies (with SDSS spectroscopy) in the range 0.0<z<0.3 detected by GALEX, there are 215 galaxies with L>2x10^10^L{sun} at 1530{AA} (observed wavelength).
