J/BaltA/12/301 Vilnius photometry in Barnard 1 (Cernis+, 2003)
Interstellar extinction in the direction of the Barnard 1 dark cloud in Perseus.
Cernis K., Straizys V.
<Baltic Astronomy, 12, 301-321 (2003)>
=2003BaltA..12..301C 2003BaltA..12..301C
ADC_Keywords: Molecular clouds ; Photometry, Vilnius
Keywords: techniques: photometric: Vilnius photometric system -
stars: fundamental parameters, classification -
ISM: extinction, dust clouds - ISM: individual objects: Barnard 1
Abstract:
Spectral and luminosity classes, absolute magnitudes. color excesses,
interstellar extinctions and distances are determined for 98 stars
down to 13mag in the Barnard 1 dark cloud belonging to the Per OB2
association. The classification of stars is based on their
photoelectric photometry in the Vilnius seven-color photometric
system. The extinction vs. distance diagram exhibits the presence of
two dust layers at 150 and 230pc distances. The distance of the first
cloud, which gives an extinction AV of 0.3mag, coincides with the
distance of the Taurus dark cloud complex. The second cloud with much
larger extinction is about at the same distance as the clouds in the
direction of the nearby objects: reflection nebula NGC 1333 and open
cluster IC 348.
Description:
Photometry of stars was obtained by one of the authors (K. Cernis)
with the 1 meter telescope at the Maidanak Observatory in Uzbekistan
during three observing runs (1992, 1994 and 1996).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 128 Results of photometry
table2.dat 74 128 Results of photometric quantification,
determination of color excess, extinctions and
distances of the stars
notes.dat 80 82 Individual notes
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
4 A1 --- n_Seq [*] indicates a note detailed in notes.dat
5 A1 --- f_Seq [0] 0 = suspected binaries
7- 13 A7 --- BD BD number
17 I1 h RAh Right ascension (J2000.0)
19- 20 I2 min RAm Right ascension (J2000.0)
22- 23 I2 s RAs Right ascension (J2000.0)
25 A1 --- DE- Declination sign (J2000.0)
26- 27 I2 deg DEd Declination (J2000.0)
29- 32 F4.1 arcmin DEm Declination (J2000.0)
34- 38 F5.2 mag Vmag Vilnius V magnitude
40- 43 F4.2 mag U-V Vilnius U-V colour index
44 A1 --- u_U-V Uncertainty flag on U-V
46- 49 F4.2 mag P-V Vilnius P-V colour index
50 A1 --- u_P-V Uncertainty flag on P-V
52- 55 F4.2 mag X-V Vilnius X-V colour index
57- 60 F4.2 mag Y-V Vilnius Y-V colour index
62- 65 F4.2 mag Z-V Vilnius Z-V colour index
67- 70 F4.2 mag V-Z Vilnius V-Z colour index
72 I1 --- NObs Number of observations
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5 A1 --- n_Seq [*] indicates a note in notes.file
7- 15 A9 --- GSC GSC number
17- 27 A11 --- SpType Photometric MK spectral type
29- 36 A8 --- SpType2 Other MK spectral type
38- 42 F5.2 mag Vmag Vilnius V magnitude
44- 47 F4.1 mag VMAG ?=- Vilnius absolute V magnitude
48 A1 --- u_VMAG Uncertainty flag on VMAG
50- 53 F4.2 mag E(Y-V) ?=- Color excess in Y-V
54 A1 --- u_E(Y-V) Uncertainty flag on E(Y-V)
56- 59 F4.2 mag AV ?=- Absorption in V band
60 A1 --- u_AV Uncertainty flag on AV
62- 65 I4 pc r ?=- Distance
66 A1 --- u_r Uncertainty flag on r
68- 71 F4.2 mag sQ ? Quality flag (1)
72- 74 A3 --- n_sQ [Q,Q] Note on sQ (1)
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Note (1): The classification is of the best quality when sQ=0.01mag.
If sQ≥0.03, the star is peculiar or accuracy of its photometry is
low. Q,Q stands for the G8-K5 type stars which were classified by the
interstellar reddening-free QXZS,QXYZ or QUPY,QXZS diagrams.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number of the star
5- 80 A76 --- Note Text of the note
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History:
Prepared via OCR at CDS.
(End) Patricia Vannier [CDS] 21-Nov-2006