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Astron. Astrophys. 345, 244-248 (1999)

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2. Observations

High-resolution spectra (resolving power 30000) were obtained using the CAT telescope and the CES spectrograph at ESO, La Silla, Chile, on 20-24 April 1992, in remote control mode from Garching. Helium and preliminary CNO abundances were described in Zboril, Glagolevskij & North (1994). The low resolution spectra (resolving power [FORMULA]4150) were obtained using the 1.5m spectrographic telescope and the Boller & Chivens spectrograph at ESO on 4-10 January 1993. Helium abundance analysis is described in Zboril et al. (1994) and Zboril et al. (1997). The total sample consists of 6 standard stars and 21 He-rich stars.

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© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999
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