Browsing by Subject "techniques: spectroscopic"
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- ItemOpen AccessExploring inside-out Doppler tomography: magnetic cataclysmic variables(2016) Kotze, E J; Potter, S B; McBride, V AContext. Doppler tomography of magnetic cataclysmic variables is a valuable tool for the interpretation of the complex spectroscopic emission line profiles observed for these systems.
- ItemOpen AccessExploring inside-out Doppler tomography: non-magnetic cataclysmic variables(2015) Kotze, E J; Potter, S B; McBride, V AContext. Doppler tomography is a technique that has revolutionised the interpretation of the phase-resolved spectroscopic observations of interacting binary systems.
- ItemOpen AccessLong-term optical and X-ray variability of the Be/X-ray binary H 1145-619: Discovery of an ongoing retrograde density wave(2017) Alfonso-Garzón, J; Fabregat, J; Reig, P; Kajava, J J E; Sánchez-Fernández, C; Townsend, L J; Mas-Hesse, J M; Crawford, S M; Kretschmar, P; Coe, M JContext. Multiwavelength monitoring of Be/X-ray binaries is crucial to understand the mechanisms producing their outbursts. H 1145-619 is one of these systems, which has recently displayed X-ray activity.
- ItemOpen AccessNTT and NOT spectroscopy of SDSS-II supernovae(2011) Östman, L; Nordin, J; Goobar, A; Amanullah, R; Smith, M; Sollerman, J; Stanishev, V; Stritzinger, M D; Bassett, B A; Davis, T M; Edmondson, E; Frieman, J A; Garnavich, P M; Lampeitl, H; Leloudas, G; Marriner, J; Nichol, R C; Romer, K; Sako, M; Schneider, D P; Zheng, CContext. The Sloan Digital Sky Survey II (SDSS-II) Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of type Ia supernovae around z ∼ 0.2, the redshift “gap” between low-z and high-z supernova searches. The survey has provided multi-band (ugriz) photometric lightcurves for variable targets, and supernova candidates were scheduled for spectroscopic observations, primarily to provide supernova classification and accurate redshifts. We present supernova spectra obtained in 2006 and 2007 using the New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT). Aims. We provide an atlas of supernova spectra in the range z = 0.03−0.32 that complements the well-sampled lightcurves from SDSS-II in the forthcoming three-year SDSS supernova cosmology analysis. The sample can, for example, be used for spectral studies of type Ia supernovae, which are critical for understanding potential systematic effects when supernovae are used to determine cosmological distances. Methods. The spectra were reduced in a uniform manner, and special care was taken in estimating the uncertainties for the different processing steps. Host-galaxy light was subtracted when possible and the supernova type fitted using the SuperNova IDentification code (SNID). We also present comparisons between spectral and photometric dating using SALT lightcurve fits to the photometry from SDSS-II, as well as the global distribution of our sample in terms of the lightcurve parameters: stretch and colour. Results. We report new spectroscopic data from 141 type Ia supernovae, mainly between −9 and +15 days from lightcurve maximum, including a few cases of multi-epoch observations. This homogeneous, host-galaxy subtracted, type Ia supernova spectroscopic sample is among the largest such data sets and unique in its redshift interval. The sample includes two potential SN 1991T-like supernovae (SN 2006on and SN 2007ni) and one potential SN 2002cx-like supernova (SN 2007ie). In addition, the new compilation includes spectra from 23 confirmed type II and 8 type Ib/c supernovae.
- ItemOpen AccessSALT long-slit spectroscopy of CTS C30.10: two-component Mg II line(2014) Modzelewska, J; Czerny, B; Hryniewicz, K; Bilicki, M; Krupa, M; Świȩtoń, A; Pych, W; Udalski, A; Adhikari, T P; Petrogalli, F570
- ItemOpen AccessStellar population and kinematics of NGC 404(2010) Bouchard, A; Prugniel, P; Koleva, M; Sharina, MContext. NGC 404 is a nearly face-on, nearby low-luminosity lenticular galaxy. Probing its characteristics provides a wealth of information on the details of the possible evolution processes of dS0 galaxies, which may not be possible in other, more distant objects.
- ItemOpen AccessThe nature of 50 Palermo Swift -BAT hard X-ray objects through optical spectroscopy(2017) Rojas, A F; Masetti, N; Minniti, D; Jiménez-Bailón, E; Chavushyan, V; Hau, G; McBride, V A; Bassani, L; Bazzano, A; Bird, A J; Galaz, G; Gavignaud, I; Landi, R; Malizia, A; Morelli, L; Palazzi, E; Patiño-Álvarez, V; Stephen, J B; Ubertini, PWe present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy campaign performed at seven telescopes in the northern and southern hemispheres. These objects were detected with the Burst Alert Telescope (BAT) instrument onboard the Swift satellite and listed as of unidentified nature in the 54-month Palermo BAT catalogue. In detail, 45 sources in our sample are identified as active galactic nuclei of which, 27 are classified as type 1 (with broad and narrow emission lines) and 18 are classified as type 2 (with only narrow emission lines). Among the broad-line emission objects, one is a type 1 high-redshift quasi-stellar object, and among the narrow-line emission objects, one is a starburst galaxy, one is a X-ray bright optically normal galaxy, and one is a low ionization nuclear emission line region. We report 30 new redshift measurements, 13 confirmations and 2 more accurate redshift values. The remaining five objects are galactic sources: three are Cataclismic Variables, one is a X-ray Binary probably with a low mass secondary star, and one is an active star.
- ItemOpen AccessUnveiling the nature of INTEGRAL objects through optical spectroscopy: III. Observations of seven southern sources(2006) Masetti, N; Pretorius, M L; Palazzi, E; Bassani, L; Bazzano, A; Bird, A J; Charles, P A; Dean, A J; Malizia, A; Nkundabakura, P; Stephen, J B; Ubertini, P. The detection, thanks to the