Spectroscopy and BV I C photometry of the young open cluster NGC 6604 ⋆
نویسندگان
چکیده
BV I C photometry and classification spec-troscopy 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 rota-tional velocities. We obtain 1.7 kpc as the cluster distance, an age of ∼ 5 × 10 6 years and a reddening E B−V = 1.02 (±0.01 from three independent methods). Pre-ZAMS objects are apparently not detected over the △m = 8.5 mag explored range. The cluster radial velocity is in agreement with the Hron (1987) model for the Galaxy disk rotation.
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