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The N2K Consortium. VII. Atmospheric Parameters of 1907 Metal-rich Stars: Finding Planet-Search Targets
We report high-precision atmospheric parameters for 1907 stars in theN2K low-resolution spectroscopic survey, designed to identify metal-richFGK dwarfs likely to harbor detectable planets. Of these stars, 284 arein the ideal temperature range for planet searches,Teff<=6000 K, and have a 10% or greater probability ofhosting planets based on their metallicities. The stars in thelow-resolution spectroscopic survey should eventually yield >60 newplanets, including 8-9 hot Jupiters. Short-period planets have alreadybeen discovered orbiting the survey targets HIP 14810 and HD 149143.
| Close binary systems in OB-associations regions. V. the star V456 Cyg in direction of Cyg OB1
New UBVR photoelectric observations of the eclipsing variable star V456Cyg of Algol type were obtained at the Maidanak Observatory in1999-2003. The new ephemeris of the binary is: Min I=JDH2444911.3592(7)+ {0.89119484 (14)d}\cdot{E} + {0.15(1)}d\cdot10-9{\cdot E2}. All of the light curves of thestar V456 Cyg were solved by Lavrov's direct method, and elements of thephotometric orbit were calculated. The results obtained in R-curve aredifferent from data for other ones. We estimated the absolute basicparameters of the components: M1=2.0M&sun;,M2 = 1.7M&sun;,R1=1.7R&sun;, R2 =1.6R&sun;, M1, bol = +1.7m,M2,bol = +2.5m. The components do not reach ZAMSin the H-R diagram and their age is 107 yrs. The distance forthe star V456 Cyg is about 600 pc. The star lies in a well-makedOB-stars group separated by a distance of about 500 pc in the directionof the OB-association Cyg OB1.
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Pozíciós és asztrometriai adatok
| Csillagkép: | Hattyú |
| Rektaszcenzió: | 20h28m41.83s |
| Deklináció: | +39°11'17.9" |
| Vizuális fényesség: | 8.667 |
| Távolság: | 93.633 parszek |
| RA sajátmozgás: | 29.6 |
| Dec sajátmozgás: | 50.3 |
| B-T magnitude: | 9.858 |
| V-T magnitude: | 8.766 |
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