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HD 15360


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Morphological Evolution of Distant Galaxies from Adaptive Optics Imaging
We report here on a sample of resolved, infrared images of galaxies atz~0.5 taken with the 10 m Keck Telescope's adaptive optics system. Weregularly achieve a spatial resolution of 0.05" and are thus able toresolve both the disk and bulge components. We have extractedmorphological information for 10 galaxies and compared their propertiesto those of a local sample. The selection effects of both samples wereexplicitly taken into account in order to derive the unbiased resultthat disks at z~0.5 are ~0.6 mag arcsec-2 brighter than, andabout the same size as, local disks. The case with no luminosityevolution is ruled out at 90% confidence. We also find, in a morequalitative analysis, that the bulges of these galaxies have undergone asmaller amount of surface brightness evolution and have also not changedsignificantly in size from z~0.5 to today. This is the first time thistype of morphological evolution has been measured in the infrared and itpoints to the unique power of AO in exploring galaxy evolution.

Faint Field Galaxies around Bright Stars: A New Strategy for Imaging at the Diffraction Limit
This paper presents a new strategy for observing faint galaxies withhigh-order natural guide star systems. We have imaged five high Galacticlatitude fields within the isoplanatic patch of bright stars (8.5mag

Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm

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Osservazione e dati astrometrici

Costellazione:Ariete
Ascensione retta:02h28m48.10s
Declinazione:+23°52'13.9"
Magnitudine apparente:8.447
Distanza:401.606 parsec
Moto proprio RA:-8.4
Moto proprio Dec:-1.6
B-T magnitude:8.612
V-T magnitude:8.461

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 15360
TYCHO-2 2000TYC 1766-80-1
USNO-A2.0USNO-A2 1125-00792382
HIPHIP 11547

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