Search Publications
Fundamental parameters and evolutionary state of the Herbig Ae star candidate HD 35929
Miroshnichenko, A. S.; Bjorkman, K. S.; Gray, R. O. +2 more
HD 35929 is a pre-main-sequence Herbig Ae star candidate that exhibits emission in the Hα line and a weak IR excess. Although its luminosity type was estimated as IV from low-resolution spectroscopy, the insignificant HIPPARCOS parallax (0.88±0.93 mas) contradicted the low luminosity. To resolve this discrepancy, we took 3 high-resolution optical …
Photoionization model analysis of the planetary nebula Hu1-2
Pottasch, S. R.; Feibelman, W. A.; Hyung, S.
We have obtained high resolution optical spectra of the planetary nebula
Multicolour CCD measurements of nearby visual double stars. II
Strigachev, A.; Lampens, P.
We present accurate CCD astrometric and photometric data for 31 nearby visual double stars in the standard filters BVRI. The observations were collected with a 1.3-m telescope in 2001-2002 The results consist of relative astrometric positions (epoch, angular separation and position angle) and differential BVRI photometry of the components. Mean er…
ISOCAM observations of the L1551 star formation region
Prusti, T.; Perault, M.; Olofsson, G. +17 more
The results of a deep mid-IR ISOCAM survey of the
Magnetic activity in HD 111456, a young F5-6 main-sequence star
Freire Ferrero, R.; Frasca, A.; Catalano, S. +1 more
We present spectroscopic and photometric observations of the young F5-6 V field star
Celestial position of the companion of PSR J1740-5340
Bassa, C. G.; Stappers, B. W.
We present optical astrometry of archival ground and space based imaging of the companion to PSR J1740-5340. The optical position of the companion is significantly offset from the timing position of the pulsar. We briefly investigate the effects of this inconsistency on other timing parameters and compare our position with an improved position of …
The Pul-3 catalogue of 58483 stars in the Tycho-2 system
Bronnikova, N. M.; Khrutskaya, E. V.; Khovritchev, M. Yu.
A catalogue of positions and proper motions of 58483 stars (Pul-3) has been constructed at the Pulkovo observatory. The Pul-3 is based on the results of measurements of photographic plates with galaxies (Deutsch's plan). All plates were taken using the Pulkovo Normal Astrograph (the first epoch is in the 1950s and the second epoch is in the 1970s)…
Tentative detection of micron-sized forsterite grains in the proto-planetary disk surrounding HD 100453
Waters, L. B. F. M.; Dominik, C.; van Boekel, R. +4 more
We have re-analyzed the ISO-SWS spectrum of the intermediate mass pre-main-sequence star HD 100453. We confirm the weakness of the 10 µm amorphous silicate band. We have found strong indications of the presence of a crystalline silicate emission at 34 µm, which had escaped detection so far due to severe glitches in the data. The 23.5 a…
The double radio source 3C 343.1: A galaxy-QSO pair with very different redshifts
Burbidge, E. M.; Arp, H.; Burbidge, G.
The strong radio source 3C 343.1 consists of a galaxy and a QSO separated by no more than about 0.25''. The chance of this being an accidental superposition is conservatively ∼1×10-8. The z=0.344 galaxy is connected to the z=0.750 QSO by a radio bridge. The numerical relation between the two redshifts is that predicted from p…
Dark baryons not in ancient halo white dwarfs
McCracken, H. J.; Reylé, C.; Robin, A. C. +5 more
Having ruled out the possibility that stellar objects are the main contributor of the dark matter embedding galaxies, microlensing experiments cannot exclude the hypothesis that a significant fraction of the Milky Way dark halo might be made of MACHOs with masses in the range 0.5-0.8 M⊙. Ancient white dwarfs are generally considered the…