The VLT-FLAMES survey of massive stars: Observations in the Galactic clusters NGC 3293, NGC 4755 and NGC 6611

Free access article

Issue		A&A Volume 437, Number 2, July II 2005


Page(s)		467 - 482
Section		Galactic structure, stellar clusters and populations
DOI		http://dx.doi.org/10.1051/0004-6361:20042446

A&A 437, 467-482 (2005)
DOI: 10.1051/0004-6361:20042446

The VLT-FLAMES survey of massive stars: Observations in the Galactic clusters NGC 3293, NGC 4755 and NGC 6611

C. J. Evans¹, S. J. Smartt², J.-K. Lee², D. J. Lennon¹, A. Kaufer³, P. L. Dufton², C. Trundle⁴, A. Herrero^{4, 5}, S. Simón-Díaz⁴, A. de Koter⁶, W.-R. Hamann⁷, M. A. Hendry⁸, I. Hunter², M. J. Irwin⁸, A. J. Korn⁹, R.-P. Kudritzki¹⁰, N. Langer¹¹, M. R. Mokiem⁶, F. Najarro¹², A. W. A. Pauldrach¹³, N. Przybilla¹⁴, J. Puls¹³, R. S. I. Ryans², M. A. Urbaneja¹⁰, K. A. Venn¹⁵ and M. R. Villamariz⁴

¹ The Isaac Newton Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Canary Islands, Spain
e-mail: cje@ing.iac.es
² The Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, UK
³ European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile
⁴ Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
⁵ Dept. de Astrofísica, Universidad de La Laguna, Avda. Astrofísico Francisco S $\acute{\rm a}$ nchez, s/n, 38071 La Laguna, Spain
⁶ Astronomical Institute Anton Pannekoek, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
⁷ Lehrstuhl Astrophysik der Universit $\ddot{\rm a}$ t Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
⁸ Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
⁹ Uppsala Astronomical Observatory, Box 515, 75120 Uppsala, Sweden
¹⁰ Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
¹¹ Astronomical Institute, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
¹² Instituto de Estructura de la Materia, CSIC, C/ Serrano 121, 28006 Madrid, Spain
¹³ Universit $\ddot{\rm a}$ ts-Sternwarte M $\ddot{\rm u}$ nchen, Scheinerstr. 1, 81679 M $\ddot{\rm u}$ nchen, Germany
¹⁴ Dr. Remeis-Sternwarte Bamberg, Sternwartstr. 7, 96049 Bamberg, Germany
¹⁵ Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105, USA

(Received 29 November 2004 / Accepted 14 March 2005 )

Abstract
We introduce a new survey of massive stars in the Galaxy and the Magellanic Clouds using the Fibre Large Array Multi-Element Spectrograph (FLAMES) instrument at the Very Large Telescope (VLT). Here we present observations of 269 Galactic stars with the FLAMES-Giraffe Spectrograph ( $R \simeq 25\,000$ ), in fields centered on the open clusters NGC 3293, NGC 4755 and NGC 6611. These data are supplemented by a further 50 targets observed with the Fibre-Fed Extended Range Optical Spectrograph (FEROS, R = 48 000). Following a description of our scientific motivations and target selection criteria, the data reduction methods are described; of critical importance the FLAMES reduction pipeline is found to yield spectra that are in excellent agreement with less automated methods. Spectral classifications and radial velocity measurements are presented for each star, with particular attention paid to morphological peculiarities and evidence of binarity. These observations represent a significant increase in the known spectral content of NGC 3293 and NGC 4755, and will serve as standards against which our subsequent FLAMES observations in the Magellanic Clouds will be compared.

Key words: stars: early-type -- stars: fundamental parameters -- open clusters and associations: individual: NGC 3293 -- open clusters and associations: individual: NGC 4755 -- open clusters and associations: individual: NGC 6611

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