EDP Sciences
Free access
Issue A&A
Volume 494, Number 3, February II 2009
Page(s) 1137 - 1166
Section Catalogs and data
DOI http://dx.doi.org/10.1051/0004-6361:200810371
Published online 20 November 2008

A&A 494, 1137-1166 (2009)
DOI: 10.1051/0004-6361:200810371

The Quintuplet cluster

I. A K-band spectral catalog of stellar sources
A. Liermann, W.-R. Hamann, and L. M. Oskinova

University of Potsdam, Institute for Physics and Astronomy, 14476 Potsdam, Germany
    e-mail: adriane@astro.physik.uni-potsdam.de

Received 11 June 2008 / Accepted 10 September 2008

Abstract
Context. Three very massive clusters are known to reside in the Galactic center region, the Arches cluster, the Quintuplet cluster, and the central parsec cluster, each of them rich in young hot stars. With new infrared instruments, this region is no longer obscured for the observer.
Aims. For understanding these very massive clusters, it is essential to know their stellar inventory. We provide comprehensive spectroscopic data for the stellar population of the Quintuplet cluster that will form the basis of subsequent spectral analyses.
Methods. Spectroscopic observations of the Quintuplet cluster were obtained with the Integral Field Spectrograph SINFONI-SPIFFI at the ESO-VLT. The inner part of the Quintuplet cluster was covered by 22 slightly overlapping fields, each of them of $8\arcsec \times 8\arcsec$ in size. The spectral range comprises the near-IR K-band from 1.94 to 2.45 $\mu$m. The 3D data cubes of the individual fields were flux-calibrated and combined to one contiguous cube, from which the spectra of all detectable point sources were extracted.
Results. We present a catalog of 160 stellar sources in the inner part of the Quintuplet cluster. The flux-calibrated K-band spectra of 98 early-type stars and 62 late-type stars are provided as Online Material. Based on these spectra, we assign spectral types to all detected sources and derive synthetic K</I>s-band magnitudes. Our sample is complete to about the 13th K-magnitude. We report the detection of two hitherto unknown Wolf-Rayet stars of late WC type (WC9 or later). Radial velocities are measured and employed to assess the cluster membership. The quantitative analysis of the early-type spectra will be the subject of a subsequent paper.


Key words: catalogs -- Galaxy: center -- Galaxy: open cluster and associations: individual: quintuplet -- infrared: stars -- stars: late-type -- stars: early-type



© ESO 2009

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)