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J/BaltA/14/179   Vilnius photometry of NGC 1647 area  (Zdanavicius+, 2005)

Seven-color photometry of the open cluster NGC 1647 area. Zdanavicius J., Straizys V., Chen C.W., Chen W.P., Zdanavicius K., Kazlauskas A., Cernis K., Davis P.A.G., Boyle R.P., Tautvaisiene G. <Baltic Astron. 14, 179-203 (2005)> =2005BaltA..14..179Z
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, Vilnius Keywords: stars: fundamental parameters - clusters: individual (NGC 1647) - methods: photometric - Vilnius photometric system Abstract: The area of the open cluster NGC 1647 in Taurus is investigated by CCD photometry in the Vilnius seven-color system. Magnitudes and color indices are determined for 433 stars down to V=15.0mag in the 45arcmin diameter area. For 252 of them photometric spectral and luminosity classes, interstellar reddenings, extinctions and distances are obtained. According to the CDS WEBDA database, 89 of them have a high cluster membership probability. Their mean distance from the Sun is 555±74pc, excluding four stars which seem to be field stars. The main sequence starts at spectral class B7 V which corresponds to a cluster age of about 150 million years. Cluster members show a differential interstellar extinction ranging from 0.8 to 1.8mag. The mean extinction of the cluster stars is 1.12±0.25mag. Interstellar extinction in the area is dominated by the Taurus dark cloud complex at 160pc. Color excesses of individual stars correlate well with the 100um dust thermal emission intensity. The cluster shape is investigated by counting stars down to K=15.6mag and is found to be elongated in the direction roughly perpendicular to the Milky Way, with the flattening 0.4. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 121 13 Photoelectric standards in NGC 1647 measured in 2003 with the 1.5m telescope on Mt. Lemmon, Arizona table2.dat 81 433 The results of CCD photometry of the NGC 1647 field notes.dat 86 53 Individual notes table3.dat 84 252 Photometric classification, extinctions and distances
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 13 I3 --- Seq Sequential number, Cl* NGC 1647 ZSC NNNN in Simbad 15- 16 I2 h RAh Right ascension (J2000) 18- 19 I2 min RAm Right ascension (J2000) 21- 24 F4.1 s RAs Right ascension (J2000) 26 A1 --- DE- Declination sign (J2000) 27- 28 I2 deg DEd Declination (J2000) 30- 31 I2 arcmin DEm Declination (J2000) 33- 34 I2 arcsec DEs Declination (J2000) 36- 41 F6.3 mag Vmag Vilnius V magnitude 43- 47 F5.3 mag U-V Vilnius U-V colour index 49- 53 F5.3 mag P-V Vilnius P-V colour index 55- 59 F5.3 mag X-V Vilnius X-V colour index 61- 65 F5.3 mag Y-V Vilnius Y-V colour index 67- 71 F5.3 mag Z-V Vilnius Z-V colour index 73- 77 F5.3 mag V-S Vilnius V-S colour index 79- 83 F5.3 mag e_Vmag rms uncertainty on Vmag 85- 89 F5.3 mag e_U-V rms uncertainty on U-V 91- 95 F5.3 mag e_P-V rms uncertainty on P-V 97-101 F5.3 mag e_X-V rms uncertainty on X-V 103-107 F5.3 mag e_Y-V rms uncertainty on Y-V 109-113 F5.3 mag e_Z-V rms uncertainty on Z-V 115-119 F5.3 mag e_V-S rms uncertainty on V-S 121 I1 --- o_Vmag Number of independent observations
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Sequential number (Cl* NGC 1647 ZSC NNNN in Simbad) 6- 86 A81 --- Note Text of the note
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Sequential number, Cl* NGC 1647 ZSC NNNN in Simbad 5 A1 --- n_Seq [*] indicates a note in notes.dat file 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 16 F4.1 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 26 I2 arcsec DEs Declination (J2000) 28- 33 F6.3 mag Vmag Vilnius V magnitude 35- 39 F5.3 mag U-V ? Vilnius U-V colour index 40 A1 --- u_U-V Uncertainty flag on U-V 42- 46 F5.3 mag P-V ? Vilnius P-V colour index 47 A1 --- u_P-V Uncertainty flag on P-V 49- 53 F5.3 mag X-V Vilnius X-V colour index 55- 59 F5.3 mag Y-V Vilnius Y-V colour index 61- 65 F5.3 mag Z-V Z-V colour index 67- 71 F5.3 mag V-S Vilnius V-S colour index 73- 81 A9 --- SpType Photometric spectral type
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Sequential number, Cl* NGC 1647 ZSC NNNN in Simbad 7- 14 A8 --- SpType Photometric type 16- 20 F5.2 mag Vmag Vilnius V magnitude 22- 25 F4.1 mag VMAG Absolute V magnitude 27- 31 F5.3 mag Y-V Vilnius Y-V colour index 33- 36 F4.2 mag AV Absorption in V band 38- 41 I4 pc Dist Distance 43- 46 F4.2 --- Pmemb ? Membership probability 48- 84 A37 --- Note Note
History: * 20-Jun-2007: Prepared via OCR at CDS.
(End) Antoine Woelfel, Patricia Vannier [CDS] 20-Jun-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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