SIMBAD references

BVI_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 ∼5x10⁶years and a reddening E_B–V=1.02 (±0.01 from three independent methods). Pre-ZAMS objects are apparently not detected over the Δm=8.5mag explored range. The cluster radial velocity is in agreement with the Hron (1987A&A...176...34H) model for the Galaxy disk rotation.