Browsing University of Hertfordshire by Title
Now showing items 23469-23488 of 24471
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The VANDELS survey: The relation between the UV continuum slope and stellar metallicity in star-forming galaxies at z ∼ 3
(2021-02-04)The estimate of stellar metallicities (Z∗) of high-z galaxies are of paramount importance in order to understand the complexity of dust effects and the reciprocal interrelations among stellar mass, dust attenuation, stellar ... -
Vanishing point: looking for Hamlet
(2005)‘If the Mona Lisa is in the Louvre’, asked F.W. Bateson, ‘where is Hamlet?’ (74). The distinction is a common one in aesthetics, between the autographic and the allographic work (McLaverty 87). A painting (or sculpture) ... -
Variability and Proper Motion of X-ray Knots in the Jet of Centaurus A
(2019-02-05)We report results from Chandra observations analyzed for evidence of variability and proper motion in the X-ray jet of Centaurus A. Using data spanning 15 yr, collective proper motion of 11.3 ± 3.3 mas yr -1 , or 0.68 ± ... -
The Variability Behavior of NGC 925 ULX-3
(2022-07-25)We report the results of a 2019–2021 monitoring campaign with Swift and associated target-of-opportunity observations with XMM-Newton and NuSTAR, examining the spectral and timing behavior of the highly variable ultraluminous ... -
Variability in a young, L/T transition planetary-mass object
(2015-11-10)As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low-mass brown dwarfs, we detect significant variability in the young, free-floating planetary-mass object PSO J318.5-22, likely due ... -
Variability in exercise tolerance and physiological responses to exercise prescribed relative to physiological thresholds and to maximum oxygen uptake
(2023-04-30)New Findings: What is the central question of this study? Does prescribing exercise intensity using physiological thresholds create a more homogeneous exercise stimulus than using traditional intensity anchors? What is the ... -
Variability in human skin permeability in vitro: Comparing penetrants with different physicochemical properties
(2007-04)Appreciating and compensating for the inherent variability associated with percutaneous absorption is essential in optimizing (trans)dermal therapy. In this study, the variability in human skin permeability associated with ... -
Variability in the UV resonance lines of the cataclysmic variable V795 Herculis (PG-1711 + 336)
(1992)Variability in the UV resonance lines from the cataclysmic variable V795 Her is investigated on the basis of a total of 28 IUE SWP low-resolution spectra. Significant line profile fluctuations are evident in the C IV 1549 ... -
The variability in the UV resonance lines of the cataclysmic variables MU Cen, AH Her and QU Car
(1994)We present a time-variability study of the uV resonance lines Nv 1240, Si iv 1397 and C iv 1549 in the dwarf novae AH Her and MU Cen and the nova-like variable QU Car. The main findings are as follows. (i)Virtually no ... -
The Variability of M Dwarfs
(University of Hertfordshire, 2013-07-31)M dwarfs have been the subject of renewed interest as potential habitable planet hosts and have increasingly become the targets of planet detection surveys. Currently, however, the number of detections of transiting M ... -
Variability of the Centimeter-Submillimeter Spectrum and Polarization of 3C 273 during Outburst
(1998)Centimeter to submillimeter total flux and polarization monitoring data are used to investigate the nature of a prominent flare in the quasar 3C 273 during 1995/6. After removal of the quiescent level, the resulting “flare ... -
A variable active galactic nucleus at $z=2.06$ triply-imaged by the galaxy cluster MACS J0035.4-2015
(2023-07-31)We report the discovery of a triply imaged active galactic nucleus (AGN), lensed by the galaxy cluster MACS J0035.4−2015 (z d = 0.352). The object is detected in Hubble Space Telescope imaging taken for the RELICS program. ... -
The variable infrared source near HH100
(1982)Photometric observations are presented which confirm the high variability, of up to 2.5 mag at K, of the IR source associated with the Herbig-Haro object HH100, and it is suggested that such a large variation must be a ... -
Variable star classification across the Galactic bulge and disc with the VISTA Variables in the Vía Láctea survey
(2021-10-30)We present VIVACE, the VIrac VAriable Classification Ensemble, a catalogue of variable stars extracted from an automated classification pipeline for the Vista Variables in the V\'ia L\'actea (VVV) infrared survey of the ... -
Variable Stars in the Quintuplet stellar cluster with the VVV Survey
(2016-10-21)The Quintuplet cluster is one of the most massive star clusters in the Milky Way, situated very close to the Galactic center. We present a new search for variable stars in the vicinity of the cluster, using the five-year ... -
Variable stars in the VVV globular clusters. II. NGC6441, NGC6569, NGC6626 (M28), NGC6656 (M22), 2MASS-GC02, and Terzan10
(2021-07-12)Context. The Galactic globular clusters (GGCs) located in the inner regions of the Milky Way suffer from high extinction that makes their observation challenging. High densities of field stars in their surroundings complicate ...