Astronomy & Astrophysics

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A&A Vol. 374 No. 2

	Astronomy and Astrophysics
	Vol. 374 No . 2 (August I 2001)
Cover illustration: False colour images of six distant active comets (Szabó, Gy. M., et al., p. 714)

Letters

Interpretation of coronal off-limb spectral line width measurements p. L9
T. G. Moran
Abstract | References | Full HTML | PDF file (77.3 KB) | PS file (172 KB)

Search for nearby stars among proper motion stars selected by optical-to-infrared photometry - I. Discovery of LHS 2090 at spectroscopic distance of $\mathsf{{\vec d} \sim 6}$ pc p. L12
R.-D. Scholz, H. Meusinger and H. Jahreiß
Abstract | References | Full HTML | PDF file (122 KB) | PS file (239 KB)

The centrifugal force reversal and X-ray bursts p. L16
M. A. Abramowicz, W. Kluzniak and J. P. Lasota
Abstract | References | Full HTML | PDF file (95.7 KB) | PS file (194 KB)

Cosmology

A 1.2 mm MAMBO/IRAM-30 m survey of dust emission from the highest redshift PSS quasars p. 371
A. Omont, P. Cox, F. Bertoldi, R. G. McMahon, C. Carilli and K. G. Isaak
Abstract | References | Full HTML | PDF file (198 KB) | PS file (193 KB)

GRB010222: Afterglow emission from a rapidly decelerating shock p. 382
N. Masetti, E. Palazzi, E. Pian, F. Mannucci, L. A. Antonelli, A. Di Paola, P. Saracco, S. Savaglio, L. Amati, C. Bartolini, S. Bernabei, D. Bettoni, S. Covino, S. Cristiani, S. Desidera, S. Di Serego Alighieri, R. Falomo, F. Frontera, F. Ghinassi, A. Guarnieri, A. Magazzù, R. Maiolino, M. Mignoli, L. Nicastro, M. Pedani, A. Piccioni, B. M. Poggianti, V. Testa, G. Valentini and A. Zacchei
Abstract | References | Full HTML | PDF file (370 KB) | PS file (474 KB)

Extragalactic astronomy

Kinematic properties of gas and stars in 20 disc galaxies p. 394
J. C. Vega Beltrán, A. Pizzella, E. M. Corsini, J. G. Funes S. J., W. W. Zeilinger, J. E. Beckman and F. Bertola
Abstract | References | Full HTML | PDF file (2.93 MB) | PS file (1.98 MB)

Oxygen abundances in dwarf irregular galaxies and the metallicity-luminosity relationship p. 412
L. S. Pilyugin
Abstract | References | Full HTML | PDF file (160 KB) | PS file (144 KB)

The gas content of peculiar galaxies: Counterrotators and polar rings p. 421
D. Bettoni, G. Galletta, S. García-Burillo and A. Rodríguez-Franco
Abstract | References | Full HTML | PDF file (408 KB) | PS file (457 KB)

Two-sided radio emission in ON 231 (W Comae) p. 435
E. Massaro, F. Mantovani, R. Fanti, R. Nesci, G. Tosti and T. Venturi
Abstract | References | Full HTML | PDF file (409 KB) | PS file (293 KB)

Probing the faint end of the Galaxy luminosity function at $\vec{z}=$ 3 with Ly $\alpha$ emission p. 443
J. U. Fynbo, P. Møller and B. Thomsen
Abstract | References | Full HTML | PDF file (363 KB) | PS file (256 KB)

ROSAT- HRI observations of six southern galaxy pairs p. 454
G. Trinchieri and R. Rampazzo
Abstract | References | Full HTML | PDF file (405 KB) | PS file (1.68 MB)

Galactic structure and dynamics

Lumpy structures in self-gravitating disks p. 465
D. Huber and D. Pfenniger
Abstract | References | Full HTML | PDF file (1.89 MB) | PS file (10.0 MB)

Constraints on the slope of the dark halo mass function by microlensing observables p. 494
V. F. Cardone, R. de Ritis and A. A. Marino
Abstract | References | Full HTML | PDF file (198 KB) | PS file (188 KB)

Stellar clusters and associations

NGC 7654: An interesting cluster to study star formation history p. 504
A. K. Pandey, Nilakshi, K. Ogura, Ram Sagar and K. Tarusawa
Abstract | References | Full HTML | PDF file (1.33 MB) | PS file (2.99 MB)

Large Magellanic Cloud stellar clusters - I. 21 HST colour magnitude diagrams p. 523
E. Brocato, E. Di Carlo and G. Menna
Abstract | References | Full HTML | PDF file (601 KB) | PS file (998 KB)

The helium content and age of the Hyades: - Constraints from five binary systems and Hipparcos parallaxes p. 540
Y. Lebreton, J. Fernandes and T. Lejeune
Abstract | References | Full HTML | PDF file (311 KB) | PS file (282 KB)

Open clusters or their remnants: $\vec{B}$ and $\vec{V}$ photometry of NGC 1901 and NGC 1252 p. 554
D. B. Pavani, E. Bica, C. M. Dutra, H. Dottori, B. X. Santiago, G. Carranza and R. J. Díaz
Abstract | References | Full HTML | PDF file (296 KB) | PS file (590 KB)

Colour Magnitude Diagrams of the moderately metal-rich globular clusters NGC 6569 and Palomar 11 p. 564
S. Ortolani, E. Bica and B. Barbuy
Abstract | References | Full HTML | PDF file (521 KB) | PS file (736 KB)

Formation, structure and evolution of stars

The influence of diffusion and mass loss on the chemical composition of subdwarf B stars p. 570
K. Unglaub and I. Bues
Abstract | References | Full HTML | PDF file (485 KB) | PS file (450 KB)

Spectroscopy of the Crab Pulsar p. 584
G. M. Beskin and V. V. Neustroev
Abstract | References | Full HTML | PDF file (94.2 KB) | PS file (174 KB)

System parameters of the long-period polar V1309 Ori p. 588
A. Staude, A. D. Schwope and R. Schwarz
Abstract | References | Full HTML | PDF file (587 KB) | PS file (801 KB)

The distance scale of planetary nebulae p. 599
T. Bensby and I. Lundström
Abstract | References | Full HTML | PDF file (224 KB) | PS file (188 KB)

Time-resolved spectroscopy of the roAp star $\gamma$ Equ p. 615
O. Kochukhov and T. Ryabchikova
Abstract | References | Full HTML | PDF file (2.52 MB) | PS file (1.77 MB)

ISO/SWS observations of SN 1987A - II. A refined upper limit on the mass of $^\mathsf$ Ti in the ejecta of SN 1987A p. 629
P. Lundqvist, C. Kozma, J. Sollerman and C. Fransson
Abstract | References | Full HTML | PDF file (179 KB) | PS file (187 KB)

A photometric study of the massive binary RY Sct p. 638
G. Djurasevic, M. Zakirov, M. Eshankulova and S. Erkapic
Abstract | References | Full HTML | PDF file (2.26 MB) | PS file (2.10 MB)

The stellar origin of $\mathsf$ Li - Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance? p. 646
D. Romano, F. Matteucci, P. Ventura and F. D'Antona
Abstract | References | Full HTML | PDF file (342 KB) | PS file (256 KB)

HST/STIS spectroscopy of the exposed white dwarf in the short-period dwarf nova EK TrA p. 656
B. T. Gänsicke, P. Szkody, E. M. Sion, D. W. Hoard, S. Howell, F. H. Cheng and I. Hubeny
Abstract | References | Full HTML | PDF file (276 KB) | PS file (189 KB)

Stellar atmospheres

Magnetic wave energy fluxes for late-type stars - I. Longitudinal tube waves p. 662
P. Ulmschneider, Z. E. Musielak and D. E. Fawzy
Abstract | References | Full HTML | PDF file (665 KB) | PS file (785 KB)

Formation and evolution of planetary systems

The planet search program at the ESO Coudé Echelle spectrometer - II. The $\alpha$ Centauri system: Limits for planetary companions p. 675
M. Endl, M. Kürster, S. Els, A. P. Hatzes and W. D. Cochran
Abstract | References | Full HTML | PDF file (439 KB) | PS file (388 KB)

Diffuse matter in space

The HI supershell GS061+00+51 and its neighbours p. 682
S. Ehlerová, J. Palous and W. K. Huchtmeier
Abstract | References | Full HTML | PDF file (452 KB) | PS file (1.79 MB)

The sun

Temporal and spatial variations of the quiet upper chromosphere from SOHO/SUMER observations of hydrogen Lyman lines p. 691
R. Kariyappa, B. A. Varghese and W. Curdt
Abstract | References | Full HTML | PDF file (258 KB) | PS file (245 KB)

Visual and CCD astrolabe observations of the solar radius p. 697
F. Noël
Abstract | References | Full HTML | PDF file (314 KB) | PS file (653 KB)

The solar system

Determination of asteroid masses - II. (6) Hebe, (10) Hygiea, (15) Eunomia, (52) Europa, (88) Thisbe, (444) Gyptis, (511) Davida and (704) Interamnia p. 703
G. Michalak
Abstract | References | Full HTML | PDF file (133 KB) | PS file (123 KB)

Photometric observations of distant active comets p. 712
Gy. M. Szabó, B. Csák, K. Sárneczky and L. L. Kiss
Abstract | References | Full HTML | PDF file (383 KB) | PS file (4.28 MB)

Physical and chemical processes

Pair creation at shocks: Application to the high energy emission of compact objects p. 719
P. O. Petrucci, G. Henri and G. Pelletier
Abstract | References | Full HTML | PDF file (490 KB) | PS file (434 KB)

Instruments, observational techniques and data processing

Fundamental photon noise limit to radial velocity measurements p. 733
F. Bouchy, F. Pepe and D. Queloz
Abstract | References | Full HTML | PDF file (142 KB) | PS file (140 KB)

Computational methods

A new finite-field mass reconstruction algorithm p. 740
S. Seitz and P. Schneider
Abstract | References | Full HTML | PDF file (287 KB) | PS file (235 KB)

Gravitational instability of expanding shells - Solution with nonlinear terms p. 746
R. Wünsch and J. Palous
Abstract | References | Full HTML | PDF file (473 KB) | PS file (346 KB)

Astronomy and Astrophysics