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J/A+A/407/527   UBVIc and JHK photometry of NGC 1582 and NGC 1663 (Baume+, 2003)

A study of the two northern open clusters NGC 1582 and NGC 1663. Baume G., Villanova S., Carraro G. <Astron. Astrophys. 407, 527 (2003)> =2003A&A...407..527B
ADC_Keywords: Clusters, open ; Photometry, UBVRI Keywords: Galaxy: open clusters and associations: individual: NGC 1582, NGC 1663 Abstract: 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±0.03, to be situated 1100±100pc from the Sun and to have an age of 300±100Myr. 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 (∼2000Myr) and a distance of about 700pc. 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. Description: CCD UBV(I)c observations were carried out with the AFOSC camera at the 1.82m Copernico telescope of Cima Ekar (Asiago, Italy), in the photometric night of November 8, 2002. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 202 1234 Photometric catalogue of the NGC 1582 region table5.dat 202 133 Photometric catalogue of the NGC 1663 region
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: table3.dat table5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq ? Identification number (this work) (1) 6- 20 A15 --- 2MASS Identification from 2MASS (II/246) catalogue 22- 24 A3 --- --- [TYC -] 26- 36 A11 --- TYC Identification from Tycho-2 (I/259) catalogue 38- 52 A15 --- HD/GSC HD or GSC identification 55- 61 F7.1 pix Xpos X position in pixels (2) 64- 70 F7.1 pix Ypos Y position in pixels (2) 73- 74 I2 h RAh Right ascension (J2000) - hours 76- 77 I2 min RAm Right ascension (J2000) - minutes 79- 82 F4.1 s RAs Right ascension (J2000) - seconds 85 A1 --- DE- Declination (J2000) - sign 86- 87 I2 deg DEd Declination (J2000) - degrees 89- 90 I2 arcmin DEm Declination (J2000) - minutes 92- 95 F4.1 arcsec DEs Declination (J2000) - seconds 98-102 F5.2 mag Vmag ? V magnitude 104-105 A2 --- n_Vmag Comments for V magnitude (3) 107-111 F5.2 mag B-V ? B-V colour index 113-114 A2 --- n_B-V Comments for B-V index (3) 116-120 F5.2 mag U-B ? U-B colour index 122-123 A2 --- n_U-B Comments for U-B index (3) 125-129 F5.2 mag V-I ? V-I (Cousins) colour index 131-132 A2 --- n_V-I Comments for V-I index (3) 134-138 F5.2 mag Jmag ? J magnitude (2) 140-141 A2 --- n_Jmag Comments for J magnitude (3) 143-147 F5.2 mag Hmag ? H magnitude (2) 149-150 A2 --- n_Hmag Comments for H magnitude (3) 152-156 F5.2 mag Kmag ? K magnitude (2) 158-159 A2 --- n_Kmag Comments for K magnitude (3) 161-165 F5.2 mag J-K ? J-K colour index 167-168 A2 --- n_J-K Comments for J-K index (4) 171-172 A2 --- Memb Membership assignment (5) 176-179 F4.2 mag E(B-V) ? B-V colour excess 183-186 F4.2 mag E(U-B) ? U-B colour excess 190-193 F4.2 mag E(V-I) ? V-I colour excess 195-202 A8 --- SpType MK spectral classification
Note (1): Star designation: Table 3, Cl* NGC 1582 BVC N in Simbad, Table 5, Cl* NGC 1663 BVC NN in Simbad Note (2): Scale = 0.465 arcsecond / pixel Note (3): Comments: (: ) error larger than 0.05 (::) error larger than 0.10 (T) data obtained from Tycho-2 (I/259) catalogue (H) data obtained from Hipparcos (I/239) catalogue (C) data computed from spectral classification Note (4): Data from 2MASS (II/246) catalogue Note (5): Membership assignment: m = member pm = probable member nm = non-member
Acknowledgements: G. Baume
(End) Patricia Bauer [CDS] 25-Nov-2003
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