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9061. http://star.arm.ac.uk/~ambn/abstract186.ps
A study of the size and composition of dust grains in the circumstellar envelope of IRC + 10 o 216 S. Bagnulo, J.G. Doyle and I.P. Griffin We utilise a modelling technique in which a generalised twoґstream Eddington approximation is applied to the problem of the radiative transfer in a spheriґ cally symmetric dust shell. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract186.ps -- 31.2 Кб -- 16.08.1996
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9062. http://star.arm.ac.uk/~ambn/abstract187.ps
The O IV and S IV intercombination lines in solar and spectra ultraviolet spectra J.W. Cook, F.P. Keenan, P.L. Dufton, A.E. Kingston, A.K. Pradhan, H.L. Zhang, J.D. Doyle M.A. Hayes New calculations of O IV electron density diagnostic emission line ratios involvґ ing the 1399.8 A, 1401.2 A, 1404.2 A, 1407.4 A transitions are presented. ... However, the electron density obtained using the Ratio R 2 = I(1407.4 A)/(1404.8 A) is often an order of magnitude smaller. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract187.ps -- 33.4 Кб -- 16.08.1996
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9063. http://star.arm.ac.uk/~ambn/abstract188.ps
The upper chromosphere and lower transition reґ gion of dMe stars A.C. Lanzafame Models for the upper chromosphere and the lower transition region of dM0eґ dM2e stars are presented. ... Ambipolar diffusion is found ineffective for the ionisation balance and therefore for the energy transport in the lower transition region of dMe stars. ... Key words: Stars: atmospheres ґ Stars: chromospheres ґ Stars: lateґtype ґ Radiative transfer ґ Line: profiles 1 ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract188.ps -- 25.9 Кб -- 16.08.1996
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9064. http://star.arm.ac.uk/~ambn/abstract189.ps
Helium lines in lateґtype dwarfs A.C. Lanzafame and P B Byrne We analyse the formation of He I lines in lateґtype dwarfs by statistical equiґ librium (or NLTE radiative transfer) computations. Atmospheric models for dK (fflEri and dMe V1005 Ori (=Gl 182) stars are considered. ... Overґionisation by coronal EUV radiation is found to play a minor role in the formation of the triplet lines. Key words: Stars: atmospheres ґ Stars; chromospheres ґ Stars: lateґtype ґ Lines: formation 1 ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract189.ps -- 25.8 Кб -- 16.08.1996
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9065. http://star.arm.ac.uk/~ambn/abstract190.ps
... The chromospheric contribuґ tion to Li I lines in active dwarfs E.R. Houdebine and J.G. Doyle In magnetically active stars, nonґthermal heating and magnetic fields result in inhomogeneous outer atmospheres (plages) and photospheres (dark and bright spots. ... Solving the NLTEґradiation transfer problem for a grid of model atmospheres that mimic the effect of magnetic activity (from basal to saturated chromoґ spheres), we show that the Lithium lines are in fact activity sensitive. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract190.ps -- 28.7 Кб -- 16.08.1996
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9066. http://star.arm.ac.uk/~ambn/abstract191.ps
Observation and modelling of main sequence star chromospheres. ... We compare our calculations to recent high resґ olution observations for selected stars in a narrow spectral range ((RґI) ? =0.875\Sigma0.05); we show that Hff line profiles behave as expected, with a tight correlation beґ tween the line width and equivalent width. ... We show that the hydrogen series dominate the radiative cooling in the spectral lines (form 40% to 90%) for Hff emission line stars. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract191.ps -- 38.7 Кб -- 16.08.1996
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9067. Abstract 192
We present observational radial velocity curves for 12 chromospherically active binary systems and individual measurements for a further 5 systems. ... Six of our target binaries do not agree with published ephemerides or orbital parameters. We also present a rigourous derivation of the resolution limit for binary star cross-correlation radial velocities. ... Key Words: stars:binaries:close-stars:binaries:spectroscopic-techniques: radical velocities. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract192.html -- 2.1 Кб -- 16.08.1996
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9068. Abstract 193
We present optical, ultraviolet (UV) and extreme ultraviolet (EUV) results for a new active late-type dwarf star discovered by the Extreme Ultraviolet Explorer (EUVE). A large flare with an energy in excess of 1E35 erg and duration of ~1.1 days was detected in the EUVE Lex/B band (60--200AA). ... The `quiescent' EUV emission of the source is similar to the most active flare stars with the `quiescent' optical spectrum showing strong H alpha, Ca II H Mg II h emission and Li I 6707.8A absorption. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract193.html -- 2.4 Кб -- 16.08.1996
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9069. Abstract 204
. Two long mean air temperature series are presented for Armagh Observatory; one based on twice daily `spot' temperature readings, 1796-1882, and the other on daily maximum and minimum temperatures, 1844-1992. Our data comfirm the correlation of temperature with solar cycle length, first suggested by Friis-Christensen and Lassen (1991) and, for this site, extends their result a further 65 years, back to the end of the 18th century.
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Ссылки http://star.arm.ac.uk/~ambn/abstract196.html -- 1.7 Кб -- 16.08.1996
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9070. Abstract 204
In the literature, there is an ambiguity pertaining to the existance of a far-IR excess in RS CVn systems. ... We found 72 acceptable detections in the 12mu band, and 40 in the 25mu band (50% more than the IRAS Point Source Catalog). ... Furthermore, at the higher wavelength bands the IRAS angular resolution drops from 0.5 arcmin at 12mu to 2 arcmin at 100mu and the background becomes very complex so one cannot be certain about the origin of the observed flux. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract197.html -- 2.9 Кб -- 16.08.1996
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9071. http://star.arm.ac.uk/~ambn/abstract199.ps
Discovery of a white dwarf companion (EUVE J0254ґ053) to the K0 IV star HD18131 S. Vennes, M. Mathioudakis, J.G. Doyle, J.R. Thorstensen and P.B. Byrne New ultraviolet (UV) observations of lateґtype stars detected in the Extreme Ulґ traviolet Explorer (EUVE) allґsky survey revealed an unsuspected white dwarf companion to the K0 star HD18131. ... The white dwarf dominates the emission below 2000 A while the K0 star prevails at longer wavelengths. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract199.ps -- 33.1 Кб -- 16.08.1996
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9072. Abstract 200
The total radiative power output from the hot outer layers of six late-type stars (of different spectral types and luminosity class) is derived via an emission measure technique. This analysis was based on observational data from the spectral range 100A to 3000A obtained as a result of three separate satellite missions, i.e. Hubble Space Telescope, International Ultraviolet Explorer and the Extreme Ultraviolet Explorer. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract200.html -- 2.3 Кб -- 15.08.1996
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9073. http://star.arm.ac.uk/~ambn/abstract201.ps
... Emission from flare loop footpoints corresponding to plasma moving with a typical velocity of 200--400 km/s is seen in soft Xґray images. ... A nonґthermal component of the hard Xґray emission is found at the peak of the 23 June 1992 flare. The hard Xґray emission in the 13 July 1992 flare is primarily thermal, however, a possibility of an enhanced tail of the electron energy distribution above 14 keV is also indidcated. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract201.ps -- 32.7 Кб -- 15.08.1996
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9074. Abstract 204
. A general spectrum synthesis CCP7 programs SYNSPEC was modified for the purposes to analyse the atmospheres of CP stars as well as very late type stars. Modifications result into two versions of the code: for PC's and computers basically with UNIX-based operating systems.
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Ссылки http://star.arm.ac.uk/~ambn/abstract204.html -- 1.6 Кб -- 15.08.1996
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9075. Abstract 204
. There is increasing evidence of promience-like neutral hydrogen clouds suspended in the otherwise hot coronae of active late-type stars. We review this evidence here and discuss their possible role in rotational braking.
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Ссылки http://star.arm.ac.uk/~ambn/abstract202.html -- 1.5 Кб -- 15.08.1996
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9076. Abstract 203
We report the discovery of cool, promience-like material embedded in the hot corona of the rapidly rotating dMe flare/spot variable, HK Aqr. Using these observations we demonstrate that, unlike the case of the rapidly rotating K dwarf, AB Dor, these features do not form at the co-rotation radius. ... At least seven clouds were detected during each stellar rotation and they have a lifetime of greater than the three nights spanned by our data. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract203.html -- 1.9 Кб -- 15.08.1996
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9077. Abstract 205
... Recent developments in the application of the theory of line formation, joined to the increased sensitivity of instrumental techniques, augmented the number of observable quantities related to the magnetic fields of such a class of stars. ... Through the formalism of the spherical tensorial calculus, analythical formulae for most of the observable quantities are provided for a magnetic field of arbitrary complexity. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract205.html -- 3.6 Кб -- 15.08.1996
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9078. Abstract 206
. Polar spots in Doppler Imaging maps of rapidly rotating late-type stars, especially the active components of RS CVn binaries, represent a major break with the solar paradigm, within which spots are only found at low latitudes. I examine critically the evidence for polar spots and point out that they are particularly sensitive to a number of systematic effects relating to determining reference ``zero-points''.
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Ссылки http://star.arm.ac.uk/~ambn/abstract206.html -- 1.7 Кб -- 15.08.1996
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9079. http://star.arm.ac.uk/~ambn/abstract207.ps
Flare energetics: Analysis of a large flare on YZ CMi observed simultaneously in the ultraviolet, optical and radio G.H.J. van den Oord, J.G. Doyle, M. Rodono, D.E. Gary, G.W. Henry, P.B. Byrne, J.J. Linsky, B.M. Haisch, I. Pagano and G. Leto A&A, Nov. ... The flare is interpreted in terms of optically thick synchrotron emission. We present a combined interpretation of the optical/radio flare and show that the flare can be interpreted within the context of solar twoґribbon/whiteґlight flares. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract207.ps -- 33.8 Кб -- 15.08.1996
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9080. Abstract 218
Butler and Johnston (1994) have reported on the changes in mean air temperature in Northern Ireland over the last 200 years and have found a correlation with solar cycle length, consistent with that reported by Friis-Christensen and Lassen (1991) between solar cycle length and mean Northern hemisphere air temperature. ... As well as data from Northern Ireland, we have used measurements made in Preston, located close to Ireland on the West coast of England. ...
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Ссылки http://star.arm.ac.uk/~ambn/abstract209.html -- 2.4 Кб -- 15.08.1996
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