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HD 95900


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Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. VIII. The late-type stellar component
We present results of an investigation of the X-ray properties, agedistribution, and kinematical characteristics of a high-galacticlatitude sample of late-type field stars selected from the ROSAT All-SkySurvey (RASS). The sample comprises 254 RASS sources with opticalcounterparts of spectral types F to M distributed over six study areaslocated at |b|  20 °, and Dec ≥ -9 °. A detailed studywas carried out for the subsample of ~200 G, K, and M stars. Lithiumabundances were determined for 179 G-M stars. Radial velocities weremeasured for most of the 141 G and K type stars of the sample. Combinedwith proper motions these data were used to study the age distributionand the kinematical properties of the sample. Based on the lithiumabundances half of the G-K stars were found to be younger than theHyades (660 Myr). About 25% are comparable in age to the Pleiades (100Myr). A small subsample of 10 stars is younger than the Pleiades. Theyare therefore most likely pre-main sequence stars. Kinematically the PMSand Pleiades-type stars appear to form a group with space velocitiesclose to the Castor moving group but clearly distinct from the LocalAssociation.Based on observations collected at the German-Spanish AstronomicalCentre, Calar Alto, operated by the Max-Planck-Institut fürAstronomie, Heidelberg, jointly with the Spanish National Commission forAstronomy, and at the European Southern Observatory, La Silla, Chile.Tables A2-A4 are only available in electronic form athttp://www.edpsciences.org

Identification of a Complete Sample of Northern ROSAT All-Sky Survey X-Ray Sources. III. The Catalog
We present a catalog of optical identifications of a representativesample of northern ( delta > -9 deg) ROSAT All-Sky Survey (RASS)sources. A full identification has been carried out for a count-rate-and area-limited complete RASS subsample comprising 674 sources. Allsources are within six study areas outside the Galactic plane (| b |> 19.dg6), one area being near the north Galactic pole and one nearthe north ecliptic pole.

Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. II. The optical observations
We describe a program for the optical identification of a representativesample of RASS sources contained in six study areas north of delta = -9deg, with |bII| >~ 20 deg including one region near theNorth Galactic pole (NGP) and one near the North Ecliptic pole (NEP) andpresent some preliminary results. A full identification has been carriedout for a count-rate and area-limited complete subsample comprising 674sources. The ratio of ``extragalactic'' ( e.g. AGN, clusters ofgalaxies) to ``stellar'' (e.g. coronal emitters, active binaries)counterparts was found to depend on the galactic neutral hydrogen columndensity, NH. In the area near the NGP (low NH)``extragalactic'' counterparts dominate, while in the area with thehighest NH most X-ray sources are identified with stellarcounterparts.

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Observation and Astrometry data

Constellation:Crater
Right ascension:11h03m50.07s
Declination:-07°41'17.5"
Apparent magnitude:7.392
Distance:126.422 parsecs
Proper motion RA:18.9
Proper motion Dec:-70.7
B-T magnitude:8.556
V-T magnitude:7.489

Catalogs and designations:
Proper Names
HD 1989HD 95900
TYCHO-2 2000TYC 5501-1398-1
USNO-A2.0USNO-A2 0750-07441974
HIPHIP 54069

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