References of "Surdej, Jean"
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See detailDetermination of pole orientations and shapes of asteroids.
Magnusson, P.; Barucci, M. A.; Drummond, J. D. et al

in Binzel; Gehrels, T.; Matthews, M. S. (Eds.) Asteroids II (1990)

The principles of asteroid lightcurve inversion and the information available from photometry are reviewed. General tools as well as specific techniques for shape and pole determinations are summarized ... [more ▼]

The principles of asteroid lightcurve inversion and the information available from photometry are reviewed. General tools as well as specific techniques for shape and pole determinations are summarized and their advantages and shortcomings are discussed. The authors also present the results obtained so far in this very active field and discuss their significance in the general context of asteroid research and planetary formation. [less ▲]

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See detailA search for gravitational lensing among highly luminous quasars - Observational strategy and survey
Swings, Jean-Pierre ULiege; Magain, Pierre ULiege; Remy, M. et al

in Soucail, G.; Mellier, Y.; Fort, B. (Eds.) Gravitational Lensing (1990)

The observational techniques employed to search for gravitational lensing effects in highly luminous quasars (HLQs) are given, along with results of the observations. The program, begun in 1986, considers ... [more ▼]

The observational techniques employed to search for gravitational lensing effects in highly luminous quasars (HLQs) are given, along with results of the observations. The program, begun in 1986, considers the visible and dark matter distributions at different scales in the universe to determine which extragalactic objects are gravitationally lensed. The Hubble parameter and galaxy masses are determined from the observations, and observations of microlensing effects provide data on HLQ size and structures. The redshifts are found to be between 1 and 3.6, with apparent visual magnitudes 16-18.5 and absolute visual magnitudes between -29 and -30.6. About one quarter of the images exhibit either multiple components, elongated structures, jetlike features, or faint nearby galaxies. The double quasar UM 673 and its 'overlying' lens galaxy is given as a prime example of an HLQ that is gravitationally lensed. It is theorized many more HLQs are gravitationally lensed, and specific future observations are recommended. [less ▲]

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See detailBidimensional spectrography of the "clover leaf'' H1413+117 at sub-arcsec. Spatial resolution
Angonin, M. C.; Vanderriest, C.; Surdej, Jean ULiege

in Mellier, Y.; Fort, B.; Soucail, G. (Eds.) Gravitational Lensing (1990)

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See detailObservations de l’Univers lointain avec le Télescope Spatial Hubble
Surdej, Jean ULiege

in Nouvelles de la Science et des Technologies (1990), 8(Nø3-4), 87-92

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See detailDetermination of the Spin Vector of a Synthetic Asteroid
Karttunen, H.; Cellino, A.; Detal, Alain ULiege et al

in Lindblad; Lagerkvist; Rickman (Eds.) Proceedings of a meeting (AMC 89) Asteroids, Comets, Meteors III (1990)

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See detailRevisited mass-loss rates for a sample of central stars of planetary nebulae
Hutsemekers, Damien ULiege; Surdej, Jean ULiege

in Astronomy and Astrophysics (1989), 219

Using improved relations for the first order moment of a P Cygni line profile, mass-loss rates have been rederived for a sample of seventeen central stars of planetary nebulae observed with IUE in the low ... [more ▼]

Using improved relations for the first order moment of a P Cygni line profile, mass-loss rates have been rederived for a sample of seventeen central stars of planetary nebulae observed with IUE in the low resolution mode. The average value of the mass-loss rates lies between 10 to the -7th and 10 to the -8th solar masses/yr. It is confirmed that the mass-loss rates of central stars of planetary nebulae cannot be simply extrapolated from the 'mass-loss rate-luminosity' relation existing for Population I OB stars. [less ▲]

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See detailInversion of asteroid lightcurves: determination of the pole orientation.
Hainaut, O.; Detal, Alain ULiege; Surdej, Jean ULiege

in 3. International Symposium on Asteroids, Comets, Meteors, Abstr. 56 (1989, February 01)

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See detailProfiles of a Key Programme: Gravitational Lensing
Surdej, Jean ULiege; Arnaud, J.; Borgeest, U. et al

in The Messenger (1989), 55

Prior to Professor van der Laan's enquiry, in the March 1988 issue of the Messenger, on the general interest among astronomers from the European community to possibly participate in Key Programmes (KPs ... [more ▼]

Prior to Professor van der Laan's enquiry, in the March 1988 issue of the Messenger, on the general interest among astronomers from the European community to possibly participate in Key Programmes (KPs) at the European 80uthern Observatory, at least three distinct groups (including more than half of the above authors) were already involved in the study of "gravitational lensing" effects (see box on pages 10-11). Observations were being performed with the help of various telescopes on La 8illa as weil as at other observatories (VLA, CFHT, Palomar, Kitt Peak, etc.). [less ▲]

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See detailRevisited Mass-Loss Rates of Planetary Nebula Nuclei Observed with IUE
Hutsemekers, Damien ULiege; Surdej, Jean ULiege

in Torres-Peimbert, Silvia (Ed.) Planetary Nebulae, 131st. Symposium of the International Astronomical Union (1989)

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See detailDiscovery of a quadruply lensed quasar - The 'clover leaf' H1413 + 117
Magain, Pierre ULiege; Surdej, Jean ULiege; Swings, J.-P. et al

in Nature (1988), 334

The authors report the discovery of a second gravitational lens system in the broad absorption line quasar H1413+117. Four images of comparable brightness are seen, separated by â ¡1 arcsec. The unique ... [more ▼]

The authors report the discovery of a second gravitational lens system in the broad absorption line quasar H1413+117. Four images of comparable brightness are seen, separated by â ¡1 arcsec. The unique configuration of the images, together with the fairly rare occurrence of this type of quasar, makes it incontrovertible that this is a lensed system, not a cluster of quasars. (See also 159.062). [less ▲]

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See detailStatistical tests applied to the spatial distribution of quasars in several fields.
Gosset, Eric ULiege; Surdej, Jean ULiege; Swings, Jean-Pierre ULiege

in Osmer, P. S.; Porter, A. C.; Green, R. F. (Eds.) et al Optical surveys for quasars (1988)

The authors discuss the application of different statistical tests to the study of the spatial distribution of quasars. Applications to data sets of optically selected quasars lead to the detection of a ... [more ▼]

The authors discuss the application of different statistical tests to the study of the spatial distribution of quasars. Applications to data sets of optically selected quasars lead to the detection of a clustering at a typical scale of 10 arcmin. Furthermore, the spatial distribution of quasars in a field around NGC 450 shows a deviation from randomness, towards clustering, at a scale of 10 h[SUP]-1[/SUP]Mpc. [less ▲]

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See detailSurveys of Ultraviolet Excess Quasar Candidates in Three Large Fields
Swings, Jean-Pierre ULiege; Surdej, Jean ULiege; Gosset, Eric ULiege

in Osmer, Patric S. (Ed.) Astron. Soc. of the Pac. Conf. Series: Optical Surveys for Quasars (1988)

A general description is given of the surveys performed in the fields around NGC 450 and NGC 520, and in the ESO field No. 300 with the aim of detecting ultraviolet excess quasar candidates.

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See detailSN1987a: une supernova très brillante dans le Grand Nuage de Magellan
Némry, F.; Surdej, Jean ULiege

Article for general public (1988)

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See detailNew arguments supporting the intrinsic origin of BAL QSOs - Formation of the complex Ly-alpha+NV line profile
Hutsemekers, Damien ULiege; Surdej, Jean ULiege

in Bianchi, L.; Gilmozzi, R. (Eds.) Proceedings of the Second Torino Workshop "Mass Outflows from Stars and Galactic Nuclei" (1988)

A study is presented to further elucidate the question of whether or not all quasars are affected by the BAL phenomenon. The possibility that observed BAL profiles are formed in spherically symmetric ... [more ▼]

A study is presented to further elucidate the question of whether or not all quasars are affected by the BAL phenomenon. The possibility that observed BAL profiles are formed in spherically symmetric expanding atmospheres is investigated. [less ▲]

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See detailPreliminary results from a search for gravitational lensing within a sample of highly luminous quasars
Surdej, Jean ULiege; Magain, Pierre ULiege; Swings, Jean-Pierre ULiege et al

in Balkowski, C.; Gordon, S. (Eds.) Proceedings to the First D.A.E.C. workshop on "Large Scale Structures" (1988)

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See detailSearch for Gravitational Lensing from a Survey of Highly Luminous Quasars
Surdej, Jean ULiege; Swings, J.-P.; Magain, Pierre ULiege et al

in Osmer, Patrick; Phillips, M. M. (Eds.) ASP Conference Series, Volume 2, Proceedings of a Workshop on Optical Surveys for Quasars (1988)

The authors have shown that their search for gravitational lensing from a survey of optically selected highly luminous quasars (HLQ) appears very promising. Observational features (multiple images, image ... [more ▼]

The authors have shown that their search for gravitational lensing from a survey of optically selected highly luminous quasars (HLQ) appears very promising. Observational features (multiple images, image elongation, jet-like feature, fuzz, etc.) possibly associated with the HLQ phenomenon have been detected for more than 20% of the objects under study. While it is not yet known how many of the HLQs are gravitational mirages, at least 5 (out of 111) of the investigated quasars appear to be highly luminous because of amplification of their brightness by gravitational lensing. [less ▲]

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See detailObservations of the new gravitational lens system UM 673 = Q 0142-100
Surdej, Jean ULiege; Magain, Pierre ULiege; Swings, J.-P. et al

in Astronomy and Astrophysics (1988), 198

The authors have recently initiated a high resolution direct imaging survey of a selected sample of highly luminous quasars (HLQs). The observations are carried out with the 2.2 m telescope at ESO, and ... [more ▼]

The authors have recently initiated a high resolution direct imaging survey of a selected sample of highly luminous quasars (HLQs). The observations are carried out with the 2.2 m telescope at ESO, and with the VLA at the NRAO, New Mexico. Following the first observing run at ESO, the authors have reported the discovery of a new gravitational lens system for the HLQ UM 673 = Q 0142-100. Additional observations supporting this interpretation are discussed here. Application of gravitational optometry to this system is given: a value of M[SUB]0[/SUB] = 2.4×10[SUP]11[/SUP]M_sun; is derived for the mass of the lensing galaxy located between UM 673 A and B and a most likely estimate of Deltat = 7 weeks is found for the expected delay between the arrival times of a similar variability event in the two lensed images of the quasar (H[SUB]0[/SUB] = 75 km s[SUP]-1[/SUP]Mpc[SUP]-1[/SUP], q[SUB]0[/SUB] = 0). [less ▲]

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See detailSN1987a: a bright supernova in the Large Magellanic Cloud
Surdej, Jean ULiege

in European Journal of Physics (1988), 9

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See detailAsteroid 45 Eugenia - Lightcurves and the pole orientation
Taylor, R. C.; Birch, P. V.; Pospieszalska-Surdej, Anna ULiege et al

in ICARUS (1988), 73

Nine lightcurves of asteroid 45 Eugenia, three from 1969 and six from 1984, are given. In 1984 - 1985 the H[SUB]0[/SUB] magnitude of Eugenia, corrected to the lightcurve maximum, was 7.47 and the slope ... [more ▼]

Nine lightcurves of asteroid 45 Eugenia, three from 1969 and six from 1984, are given. In 1984 - 1985 the H[SUB]0[/SUB] magnitude of Eugenia, corrected to the lightcurve maximum, was 7.47 and the slope parameter G[SUB]0[/SUB] was 0.04. The north pole of Eugenia is within ±10° of ecliptic longitude 106° and latitude +26° (or 295° and +34°). This solution is consistent with an amplitude-aspect pole analysis. The sideral period is 0.2374645±0.0000002 day and the sense of rotation is retrograde. [less ▲]

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See detailImproved first order moment method for determination of mass-loss rates
Hutsemekers, Damien ULiege; Surdej, Jean ULiege

in Bianchi, L.; Gilmozzi, R. (Eds.) Mass outflows from stars and galactic nuclei; Proceedings of the Second Torino Workshop (1988)

The first order moment of P Cygni line profiles has been computed for the case of doublets and subordinate line transitions. This improved method can be used for deriving more accurate mass-loss rates of ... [more ▼]

The first order moment of P Cygni line profiles has been computed for the case of doublets and subordinate line transitions. This improved method can be used for deriving more accurate mass-loss rates of planetary nebula nuclei, broad absorption line quasars, etc. [less ▲]

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