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HD 162261


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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.

Chromospherically Active Stars. XX. The Giant Single-Lined Binary HD 161570
Spectroscopy of HD 161570 shows it to be a single-lined spectroscopicbinary with a period of 45.623 days and a nearly circular orbit. Theprimary star has spectral type G7 III, and the secondary is most likelya G or K dwarf. A high-resolution spectrum of the 3950 Å regionconfirms that the primary has Ca II H and K emission lines. Thelogarithm of the giant's lithium abundance is less than 0.9, indicatingthat it is not lithium-rich. From photometric observations covering sixseasons, we detected periodic short-term light variability with anamplitude ranging from 0.02 to 0.04 mag. We interpret these short-termvariations as due to stellar rotation and find that the rotation periodvaried somewhat from season to season, with a representative value of64.1 days. Thus, the very different orbital and rotation periods make HD161570 an asynchronous rotator. Low-amplitude, long-term photometricvariability was also seen. The giant's weak Ca II H and K emission,low-amplitude photometric variations, and relatively low vsini of 7.0 kms-1 indicate that this star is only modestlychromospherically active. This result, plus the spectral type andasynchronous rotation of the primary, suggest that it is just beginningto ascend the red giant branch.

Radial-velocity measurements. V - Ground support of the HIPPARCOS satellite observation program
The paper presents data on 1070 radial velocity measurements of starsdistributed in 39 fields measuring 4 deg x 4 deg. The PPO series ofFehrenbach et al. (1987) and Duflot et al. (1990) is continued using theFehrenbach objective prism method.

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Observation and Astrometry data

Constellation:Hercules
Right ascension:17h48m01.41s
Declination:+44°06'25.0"
Apparent magnitude:7.699
Distance:75.019 parsecs
Proper motion RA:-25.3
Proper motion Dec:25.2
B-T magnitude:8.745
V-T magnitude:7.786

Catalogs and designations:
Proper Names
HD 1989HD 162261
TYCHO-2 2000TYC 3100-390-1
USNO-A2.0USNO-A2 1275-09575772
HIPHIP 87124

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