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The Exceptionally Large Debris Disk around γ Ophiuchi
Spitzer images resolve the debris disk around γ Ophiuchi at both24 and 70 μm. The resolved images suggest a disk radius of ~520 AU at70 μm and >~260 AU at 24 μm. The images, along with aconsistent fit to the spectral energy distribution of the disk from 20to 350 μm, show that the primary disk structure is inclined by~50° from the plane of the sky at a position angle of 55° +/-2°. Among a group of 12 debris disks that have similar host starspectral types, ages, and infrared fractional luminosities, the observedsizes in the infrared and color temperatures indicate that evolution ofthe debris disks is influenced by multiple parameters in addition to theprotoplanetary disk initial mass.
| Pulkovo compilation of radial velocities for 35495 stars in a common system.
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| 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
| Clusters in the Region of the North America Nebula.
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