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HD 1174


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A Radial Velocity Survey of the Cyg OB2 Association
We conducted a radial velocity survey of the Cyg OB2 association over a6 yr (1999-2005) time interval to search for massive close binaries.During this time we obtained 1139 spectra on 146 OB stars to measuremean systemic radial velocities and radial velocity variations. Wespectroscopically identify 73 new OB stars for the first time, themajority of which are likely to be association members. Spectroscopicevidence is also presented for a B3 Iae classification and temperatureclass variation (B3-B8) on the order of 1 yr for Cyg OB2 No. 12.Calculations of the initial mass function with the current spectroscopicsample yield Γ=-2.2+/-0.1. Of the 120 stars with the most reliabledata, 36 are probable and 9 are possible single-lined spectroscopicbinaries. We also identify three new and eight candidate double-linedspectroscopic binaries. These data imply a lower limit on the massivebinary fraction of 30%-42%. The calculated velocity dispersion for CygOB2 is 2.44+/-0.07 km s-1, which is typical of open clusters.No runaway OB stars were found.

Sir John Herschel's Observations of Stars in the Small Magellanic Cloud
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观测天体数据

星座:杜鵑座
右阿森松:00h15m40.94s
赤纬:-71°25'34.0"
视星:8.777
距离:431.034 天文距离
右阿森松适当运动:4.7
赤纬适当运动:4.3
B-T magnitude:10.233
V-T magnitude:8.898

目录:
适当名称
HD 1989HD 1174
TYCHO-2 2000TYC 9137-2533-1
USNO-A2.0USNO-A2 0150-00075248
HIPHIP 1250

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