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 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