Search Publications
High-resolution radio structure and optical kinematics of NGC 7027
Redman, M. P.; Bryce, M.; Thomasson, P. +2 more
We present the results of the highest-resolution 18-cm (L-band) radio continuum and optical kinematic studies to date of the young planetary nebula (PN), NGC 7027. We discuss the radio image of NGC 7027 made from combined data from the Multi-Element Radio-Linked Interferometer Network and the Very Large Array. This image is used to derive the dist…
QU Car: a very high luminosity nova-like binary with a carbon-enriched companion
Long, Knox S.; Drew, Janet E.; Hartley, Louise E. +1 more
QU Car is listed in cataclysmic variable star catalogues as a nova-like variable. This little-studied, yet bright interacting binary is re-appraised here in the light of new high-quality ultraviolet interstellar line data obtained with STIS on-board the Hubble Space Telescope. The detection of a component of interstellar absorption at a mean local…
On the nature of Collinder 121: insights from the low-mass pre-main sequence
Naylor, Tim; Jeffries, R. D.; Burningham, Ben +1 more
We present a VI photometric catalogue towards the open cluster Cr 121. XMM-Newton and ROSAT data are used to discover a low-mass pre-main sequence (PMS) along this sightline. de Zeeuw et al. have identified Cr 121 as a moving group, using Hipparcos data, at a distance of 592 pc; we reject the scenario that these low-mass PMS stars are associated w…
Chemical evolution of the M82 B fossil starburst
de Grijs, Richard; Gilmore, Gerry; Parmentier, Geneviève
M82 B is an old starburst site located in the eastern part of the M82 disc. We derive the distributions of age and metallicity of the star clusters located in this region of M82 by using theoretical evolutionary population synthesis models. Our analysis is based on the comparison of the BVIJ photometry obtained by de Grijs, O'Connel & Gallaghe…
On the nature of the ISO-selected sources in the ELAIS S2 region
Pozzi, F.; Calabrese, E.; Gruppioni, C. +7 more
We have studied the optical, near-infrared and radio properties of a complete sample of 43 sources detected at 15 µm in one of the deeper ELAIS repeatedly observed regions. The extragalactic objects in this sample have 15-µm flux densities in the range of 0.4-10 mJy, where the source counts start diverging from no evolution models. Abo…
Submillimetre and near-infrared observations of galaxies selected at 170 µm
Dole, H.; Lagache, G.; Puget, J. -L. +5 more
We present results from James Clerk Maxwell Telescope (JCMT) submillimetre (submm) observations of sources selected from the Infrared Space Observatory (ISO) FIRBACK (Far-infrared Background) survey, along with United Kingdom Infrared Telescope (UKIRT) near-infrared imaging of a subsample. This gives valuable insight into the brightest ~10 per cen…
The Orion nebula (M42) Herbig-Haro object, HH 201, within the tip of a molecular finger
Redman, M. P.; Meaburn, J.; Graham, M. F.
The most prominent Herbig-Haro (HH) object, HH 201, in the Orion nebula is investigated using optical spectroscopy along with optical and infrared images. An infrared Subaru H2v= 1-0 S(1) image of the region surrounding the optical line emission of HH 201 has yielded the discovery of a faint H2 finger associated with HH 201. …
TRIFFID observations of the cores of the three globular clusters M15, M92 and NGC 6712
Shearer, A.; Tuairisg, S. Ó.; Butler, R. F. +3 more
We present the results of TRIFFID simultaneous V- and B-band observations of the cores of the globular clusters M15, M92 and NGC 6712. A variability search of their dense centres was made feasible through performing post-exposure image sharpening on the images, increasing the image resolution by a factor of ~2. The ISIS implementation of the image…
The nature of X-ray selected extremely red objects
Ivison, R. J.; Smail, Ian; Page, M. J. +4 more
We report on the X-ray, optical, near-infrared, submillimetre and radio properties of five extremely red objects (EROs) selected at X-ray wavelengths by XMM-Newton in the Lockman Hole field. They all have enough counts in the X-ray band to allow spectral fitting: four are most probably obscured, Compton-thin active galactic nuclei (AGNs) with reds…
An analysis of the emission line spectra of AG Pegasi between phases 7.34 and 9.44
Contini, Marcella
The UV and optical spectra from the HST Faint Object Spectrograph and from the Fast Spectrograph for the Tillinghast Telescope (FAST) spectrograph at the Whipple Observatory reported by Kenyon, Proga & Keyes at different phases are analysed, leading to new results about the configuration of AG Pegasi. The FAST spectra contain both Hα and Hβ li…