Other
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..115j&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 115-115
Other
Scientific paper
Radial velocities (RV) were derived for a sample of OB stars belonging to Lower Centaurus Crux (LCC), Upper Centaurus Lupus (UCL) and Upper Scorpius (US) sub-groups of the Sco-Cen OB association. The knowledge of RV of OB stars of these sub-groups is important for membership determinations and the study of the past evolution and formation of these sub-groups. To measure RV of some stars belonging to the above mentioned sub-groups, 67 exposures of 56 stars were obtained between May 17, 2002 and July 7, 2002 with the 1.52 m ESO telescope equipped with FEROS echelle spectrograph (resolving power 48000 and spectral range 3550 - 9210 Å). RV were measured line by line. The cross-correlation technique is usually used for precise RV determinations of late type stars. Its application for the measurements of RV of OB stars can be problematical. On the one hand, spectra of early type stars show few absorption lines and these lines are intrinsically broad (up to a few hundreds km/sec). They are often broadened by stellar rotation and sometimes they also show variability. On the other hand, the cross-correlation peak is very broad and contains important sub-structures caused by the mixing of spectral lines of different widths. Moreover, a lot of OB stars are binaries and their broadened lines do not permit to observe them as double-lined binaries. The resulting mean values were compared with other observations in order to find new binary systems or to obtain more accurate RV for single stars. The values of the internal and external precisions of line by line measured RV are estimated as +/- 3.1 km/sec and +/- 5 km/sec. The results of these observations permitted us to recognize some stars (HD 120307, HD 116087, HD 139365 and HD 142990) as being probable spectral binaries due to their significant RV variations.
Cunha Katia
de La Reza Ramiro
Jilinski Evgueni
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