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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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Observation and Astrometry data

Constellation:Τουκάνα
Right ascension:00h15m40.94s
Declination:-71°25'34.0"
Apparent magnitude:8.777
Distance:431.034 parsecs
Proper motion RA:4.7
Proper motion Dec:4.3
B-T magnitude:10.233
V-T magnitude:8.898

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 1174
TYCHO-2 2000TYC 9137-2533-1
USNO-A2.0USNO-A2 0150-00075248
HIPHIP 1250

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