J/A+A/407/539 NGC 1582 - NGC 1663 (Baume+, 2003) ================================================================================ A study of the two northern open clusters NGC 1582 and 1663 Baume G., Villanova S. and Carraro G. =2003A&A..407...539 (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Photometry, UBVRI; Clusters, open Keywords: Galaxy: open clusters and associations: individual: NGC 1582 and NGC 1663 Description: We present CCD UBV(I)_C observations obtained in the field of the previously unstudied northern open clusters NGC 1582 and NGC 1663. For the former, we also provide high-resolution spectra of the brightest stars and complement our data with Two-Micron All Sky-Survey (2MASS) near-infrared photometry and with astrometric data from the Tycho-2 catalog. From the analysis of all these data, we argue that NGC 1582 is a very poor, quite large and heavily contaminated open cluster. It turns out to have a reddening E(B-V) = 0.35 \pm 0.03, to be situated 1100 \pm 100 pc from the Sun and to have an age of 300 \pm 100 Myr. On the other hand, we were not able to unambiguously clarify the nature of NGC 1663. By assuming it is a real cluster and from the analysis of its photometric diagrams, we found a color excess value E(B-V) = 0.20, an intermediate age value (\approx 2000 Myr) and a distance of about 700 pc. The distribution of the stars in the region however suggests we are probably facing an open cluster remnant. As an additional result, we obtained aperture photometry of three previously unclassified galaxies placed in the field of NGC 1663 and performed a preliminary morphological classification of them. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- readme.txt 80 . This file table3.txt 202 1234 Photometric catalogue of the NGC 1582 region table5.txt 202 133 Photometric catalogue of the NGC 1663 region -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.txt and table5.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- Id Identification number (this work) 6- 20 A15 --- Id_2MASS Identification from 2MASS catalogue 22- 36 A15 --- Id_Tyc Identification from Tycho-2 catalogue 38- 52 A15 --- Id_HD-GSC HD or GSC identification 55- 61 F7.1 pix Xpos X position in pixels (1) 64- 70 F7.1 pix Ypos Y position in pixels (1) 73- 74 I2 hours RA2000_h Right ascention (2000) - hours 76- 77 I2 min RA2000_m Right ascention (2000) - minutes 79- 82 F4.1 sec RA2000_s Right ascention (2000) - seconds 86- 87 I2 deg DEC2000_d Declination (2000) - degrees 89- 90 I2 min DEC2000_m Declination (2000) - minutes 92- 95 F4.1 sec DEC2000_s Declination (2000) - seconds 98-102 F5.2 mag Vmag V magnitude 104-105 A2 --- com_v Comments for V magnitude (2) 107-111 F5.2 mag B-V B-V index 113-114 A2 --- com_bv Comments for B-V index (2) 116-120 F5.2 mag U-B U-B index 122-123 A2 --- com_ub Comments for U-B index (2) 125-129 F5.2 mag V-I V-I index 131-132 A2 --- com_vi Comments for V-I index (2) 134-138 F5.2 mag Jmag J magnitude (3) 140-141 A2 --- com_j Comments for J magnitude (2) 143-147 F5.2 mag Hmag H magnitude (3) 149-150 A2 --- com_h Comments for H magnitude (2) 152-156 F5.2 mag Kmag J magnitude (3) 158-159 A2 --- com_k Comments for K magnitude (2) 161-165 F5.2 mag J-K J-K index 167-168 A2 --- com_jk Comments for J-K index (2) 171-172 A2 --- Memb Membership assignment (4) 176-179 F4.2 mag Ebv B-V excess 183-186 F4.2 mag Eub U-B excess 190-193 F4.2 mag Evi V-I excess 195-202 A8 --- SC Spectral classification -------------------------------------------------------------------------------- Note (1): scale = 0.465 arsecond / pixel Note (2): (: ) error larger than 0.05 (::) error larger than 0.10 (T) data obtained from Tycho-2 catalogue (H) data obtained from Hypparcos catalogue (C) data computed from spectral classification Note (3): Data from 2MASS catalogue Note (4): m = member pm = probable member nm = non-member ================================================================================ (End) G. Baume (2003)