Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.114c&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We report a spectroscopic investigation of brightest stars in the open clust er Bochum 7 (l=265^deg 20, b=-2deg 18; Moffat & Vogt 1975), and a detailed anal ysis of LSS 1135, member of such cluster, using photographic and CCD spectrogra ms obtained with the 1m telescope at CTIO (Chile) and with the 2.15m telescope at CASLEO (Argentina), respectively. Orbital elements for the primary component in LSS 1135 were derived, being the orbital period P=2.7532 days, and fitting a circular orbit solution with a semi amplitude K=113 km/s, was obtained. The spectral type determined for that prima ry component is O6.5 V. Furthermore, spectral types and radial velocities for seven probable members of Bochum 7 were derived, being six of them OB main-sequence stars (one with prob able radial velocity variations) and one supergiant (LSS 1140: O9Ib). Combining our spectral types and radial velocities datasets of Bochum 7 with th e photometric ones published by Moffat & Vogt (1975), we derive a distance of 5 .8 kpc from that open cluster.
Corti Mariela
Morrell Nidia I.
Niemela Virpi S.
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