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IC 2395 and BH 47: Only one open cluster in the Vela constellation
We report UBV photoelectric photometry for 273 stars in the fields ofthe open clusters IC 2395 and BH 47. Our postulate is that, rather thantwo different clusters in this region of Vela, there is only one, whichwe call IC 2395 = BH 47. The cluster is centered at about alpha =8{h} 42fm 5, delta = -48degr 06farcm 8 (2000), itsangular diameter being ~ 19'. The analysis of the photometric datayields 61 probable cluster members and 16 possible members. Photometricmembership probabilities show good agreement with those obtained from aproper motion study for 21 stars in common. The reddening across thecluster appears to be uniform, the mean E(B-V) value being 0.09 +/-0.02. The true distance modulus is (V-MV)0 = 9.52+/- 0.10, corresponding to a distance from the Sun of (800 +/- 40) pcand 48 pc below the Galactic plane. The cluster age, determined byfitting isochrones with core overshooting, turns out to be (6 +/- 2)Myr. There is a strong likelihood that IC 2395 = BH 47 is physicallyconnected to the Vela OB1C association.
| Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
| Positions of stars in regions of 14 southern galactic clusters
Positions have been obtained for a total of 3487 stars scattered over 14regions that are centered on each of the southern galactic clusters NGC1981, 2287, 2437, 2451, 2516, 2546, 2547, 2548, 3114, 3532, IC 2391,2395, 2602, and Truempler 10. A frame of reference has been establishedfor each region using ESO Schmidt plates centered on the clusters, witheach plate containing 20-35 measurable Perth 70 stars that are used fordetermining the positions of 200-400 fainter stars within a centralfield of 25 min of arc radius (covering the corresponding 1.5-m plates).
| Photoelectric photometry of late type stars in the direction opposed to galactic rotation
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974A&AS...16..269G&db_key=AST
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