Article

Spectroscopy and $BVI_{\rm C}$ photometry of the young open cluster NGC 6604

http://dx.doi.org/10.1051/aas:2000193

ABSTRACT $BVI_{\rm C}$ photometry and classification spectroscopy is presented for the young open cluster NGC 6604. Additional Echelle spectroscopy of the brightest members is used to check the reddening against the interstellar NaI and KI absorption lines, to measure the cluster radial velocity and to derive the individual rotational velocities. We obtain 1.7 kpc as the cluster distance, an age of $\sim 5~10^{6}$ years and a reddening $E_{B-V}$= 1.02 ($\pm 0.01$ from three independent methods). Pre-ZAMS objects are apparently not detected over the $\bigtriangleup m$ = 8.5 mag explored range. The cluster radial velocity is in agreement with the [CITE] model for the Galaxy disk rotation.

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Keywords

cluster distance

independent methods

individual rotational velocities

KI absorption lines

young open cluster NGC 6604