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2001A&A...376..124C - Astronomy and Astrophysics, volume 376, 124-135 (2001/9-2)

Adaptive optics L-band observations of the Galactic Center region.

CLENET Y., ROUAN D., GENDRON E., MONTRI J., RIGAUT F., LENA P. and LACOMBE F.

Abstract (from CDS):

L-band adaptive optics observations of the Galactic Center region have been performed in June 1999 and May 2000 at La Silla with the 3.6 m telescope, using the ADONIS adaptive optics system. In June 1999, we used a dedicated infrared wave-front sensor, RASOIR. This paper reports on the photometry and astrometry of more than 40 stars. Thanks to additional adaptive optics K-band observations made at CFHT, colour-magnitude diagrams have been constructed to identify individual sources with various types of stars known in this region (AGB, LPV, WC9, WN9/WN10, Ofpe/WN9, YSO). The so-called cool slash" stars (Ofpe/WN9) appear to be numerous in the field and an estimation of the extinction coefficient towards the Galactic Center from the colours of these intrinsically weakly absorbed stars leads to AK=2.7, which is among the lowest published values.

Journal keyword(s): instrumentation: adaptive optics - Galaxy: center - infrared: stars - extinction - stars: population

Nomenclature: Table 2: [CRG2001b] NNa (Nos 1-44, 26b-26c).