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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 202 1234 Photometric catalogue of the NGC 1582 region
table5.dat 196 133 Photometric catalogue of the NGC 1663 region
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table3.dat table5.dat
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Bytes Format Units Label Explanations
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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
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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
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Acknowledgements: G. Baume
(End) Patricia Bauer [CDS] 25-Nov-2003