The rapidly pulsating sdO star, SDSS J160043.6+074802.9 (2009)
Rodríguez-López, C., Lynas-Gray, A. E., Kilkenny, D., MacDonald, J., Moya, A., Koen, C., ...
A spectroscopic analysis of SDSS J160043.6+074802.9, a binary system containing a pulsating subdwarf-O (sdO) star with a late-type companion, yields Teff = 70 000 +/- 5000 K and log g = 5.25 +/-...
Detection of Photometric Variations in the sdBV Star JL 166 (2009)
Barlow, B. N, Dunlap, B. H., Lynas-Gray, A. E., Clemens, J. C.
We report the discovery of oscillations in the hot subdwarf B star JL 166 from time-series photometry using the Goodman Spectrograph on the 4.1-m Southern Astrophysical Research Telescope. Previous...
Spectroscopic Mode Identification in Slowly Pulsating Subdwarf-B Stars (2008)
Schoenaers, C., Lynas-Gray, A. E.
Mode identification is crucial for an asteroseismological study of any significance. Contrarily to spectroscopic techniques, methods such as period-fitting and multi-colour photometry do not provide...
A new ab initio ground-state dipole moment surface for the water molecule (2008)
Lodi, L., Tolchenov, R.N., Tennyson, J., Lynas-Gray, A.E., Shirin, S.V., Zobov, N.F., ...
A valence-only (V) dipole moment surface (DMS) has been computed for water at the internally contracted multireference configuration interaction level using the extended atom-centered...
Evolutionary models for two hyper-iron-poor low-mass stars (2007)
Harris, G.J., Porter, R., Lynas-Gray, A.E., Tennnyson, J.
The possible origin of two low-mass hyper-iron-poor (HIP) stars, HE0107-5240 and HE1327-2326 are investigated. The three scenarios tested are as follows. (i) The star forms metal free (Population...
A binary model for the UV-upturn of elliptical galaxies (MNRAS version) (2007)
Han, Z., Podsiadlowski, Ph., Lynas-Gray, A. E.
The discovery of a flux excess in the far-ultraviolet (UV) spectrum of elliptical galaxies was a major surprise in 1969. While it is now clear that this UV excess is caused by an old population of...
A Binary Model for the UV-upturn of Elliptical Galaxies (2007)
Han, Z., Podsiadlowski, Ph., Lynas-Gray, A. E., Schawinski, K.
The discovery of an excess of light in the far-ultraviolet (UV) in 1969 in elliptical galaxies was a major surprise. While it is now clear that this UV excess (UV-upturn) is probably caused by an old...
Non-grey hydrogen burning evolution of sub-Solar mass Population III stars (2006)
Harris, G. J., Lynas-Gray, A. E., Miller, S., Tennyson, J.
The primordial elements, H, He and Li are included in a low temperature equation of state and monochromatic opacity function. The equation of state and opacity function are incorporated into the...
The role of non-gray model atmospheres in the evolution of low mass metal poor stars (2006)
Harris, G.J., Lynas-Gray, A.E., Tennyson, J., Miller, S.
Gray model atmospheres are generally considered a reasonable approximation to make upon stars of mass greater than about 0.6 M_ȯ. Here we show that non-gray atmospheres can significantly affect...
Line-profile variations in pulsating subdwarf-B stars as a pulsation mode diagnostic (2005)
Schoenaers, C., Lynas-Gray, A. E.
In previous attempts to perform seismic modelling of pulsating subdwarf-B stars, various mode identification techniques are used with uncertain results. We investigated a method so far neglected in...
The role of HeH+ in cool helium rich white dwarfs (2004)
Harris, G.J., Lynas-Gray, A.E., Miller, S., Tennyson, J.
HeH+ is found to be the dominant positive ion over a wide range of temperatures and densities relevant to helium-rich white dwarfs. The inclusion of HeH+ in ionization equilibrium computations...
The role of HeH+ in cool helium rich white dwarfs (2004)
Harris, G. J., Lynas-Gray, A. E., Miller, S., Tennyson, J.
HeH$^+$ is found to be the dominant positive ion over a wide range of temperatures and densities relevant to helium rich white dwarfs. The inclusion of HeH$^+$ in ionization equilibrium computations...
Harris, G.J., Lynas-Gray, A.E., Miller, S., Tennyson, J.
H has been shown (1991 work of Lenzuni and coworkers) to be the dominant positive ion in a zero-metallicity gas at low temperature and intermediate to high density. It therefore affects both the...
Harris, G. J., Lynas-Gray, A. E., Miller, S., Tennyson, J.
H3+ has been shown (Lenzuni et al. 1991, ApJS, 76, 759) to be the dominant positive ion, in a zero metallicity gas at low temperature and intermediate to high density. It therefore affects both the...
New VI photometry of the sdOB binary AA Dor and an improved photometric model (2003)
Hilditch, R. W., Kilkenny, D., Lynas-Gray, A. E., Hill, G.
New VI CCD photometry, obtained with integration times of 20s, of the sdOB+degenerate-dwarf eclipsing binary system AA Dor has provided new complete light curves with an rms scatter about a mean...
The separation of the stars in the binary nucleus of the planetary nebula Abell 35 (1998)
Gatti, A. A., Drew, J. E., Oudmaijer, R. D., Marsh, T. R., Lynas-Gray, A. E.
Using the Planetary Camera on board the Hubble Space Telescope we have measured the projected separation of the binary components in the nucleus of the planetary nebula Abell 35 to be larger than...