J/other/RMxAA/39.89 UBVRI and polarisation in Lynga 1 (Vazquez+, 2003)
Lynga 1, a small open cluster containing a red-supergiant member.
Vazquez R.A., Giorgi E.E., Brusasco M.A., Baume G., Solivella G.R.
<Rev. Mex. Astron. Astrofis., 39, 89-105 (2003)>
=2003RMxAA..39...89V 2003RMxAA..39...89V
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Polarization
Keywords: open clusters and associations: individual (Lynga 1) -
stars: mass function, spectral classification - stars: polarization
Abstract:
We present CCD UBVRI (Cousins system) photometric observations
complemented with spectroscopy and polarimetric observations that
were carried out in the open cluster Lynga 1. Our data indicate that
the cluster reddening is EB-V=0.45±0.03, the ratio Av/EB-V=R
suggests that the extinction law may be slightly anomalous (R∼3.5) and
that the cluster distance modulus is V0-M_v=11.40±0.2. The age of
Lynga 1 is between 100 and 125Myr according to a fitting of
theoretical isochrones, and the slope of its mass spectrum is x∼1.7.
The brightest red star in the field is a cluster member of spectral
type K2 II-Ib.
Description:
The observations were made on June 20, 1993, with the 60cm telescope
of the University of Toronto Southern Observatory, Las Campanas,
Chile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 73 257 CCD photometric observations in Lynga 1
table4.dat 33 77 Polarization measurements
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- VGB Sequential number, Cl* Lynga 1 VGB NNN in Simbad
6- 7 I2 --- PF88 ? Peterson & Fitzgerald (1988MNRAS.235.1439P 1988MNRAS.235.1439P)
number, Cl* Lynga 1 PF NN in Simbad
10- 15 F6.2 pix Xpos X position (1)
17- 22 F6.2 pix Ypos Y position (1)
26- 30 F5.2 mag Vmag V magnitude
31- 32 A2 --- u_Vmag [: ] Uncertainty flag on Vmag (2)
33- 37 F5.2 mag B-V ? B-V colour index
38- 40 A3 --- u_B-V [: ] Uncertainty flag on B-V (2)
41- 45 F5.2 mag U-B ? U-B colour index
46- 47 A2 --- u_U-B [: ] Uncertainty flag on U-B (2)
50- 53 F4.2 mag V-Rc ? Cousins V-R colour index
54- 55 A2 --- u_V-Rc [: ] Uncertainty flag on V-Rc (2)
58- 61 F4.2 mag V-Ic ? Cousins V-I colour index
62- 63 A2 --- u_V-Ic [: ] Uncertainty flag on V-Ic (2)
66- 73 A8 --- Notes Notes about membership and color excess (3)
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Note (1): North is up and East is left. 1 pix = 0.45".
Note (2): Double colon (::) for photometric errors >0.10.
Note (3): Notes:
*: denotes stars used to derive the E(B-V) mean color excess;
lm: denotes likely member stars;
pm: denotes probable member;
Stars with proper motions (in mas/y) available from Hippacos (I/239):
Star 1: pmRAcosδ = -4.5, pmDE = 2.8
Star 2: pmRAcosδ = -8.3, pmDE = 0.2
Star 4: pmRAcosδ = -13.2, pmDE = -10.2
Star 5: pmRAcosδ = -15.0, pmDE = 4.9
Star 9: pmRAcosδ = -5.8, pmDE = -5.3
Stars showing large differences with Peterson & Fitzgerald
(1988MNRAS.235.1439P 1988MNRAS.235.1439P):
Star 1: δV = 0.17; Vint = 12.56; δVint = 0.10
Star 10: δV = 0.18; Vint = 12.32; δVint = -0.09
Star 28: δV = -0.46; Vint = 13.68; δVint = 0.24
Star 29: δV = 0.56; Vint = 13.97; δVint = 0.08
Star 35: δV = 0.14; Vint = 14.71; δVint = 0.07
Star 40: δV = 0.89; Vint = 14.45; δVint = 0.30
Star 49: δV = -1.21; Vint = 15.39; δVint = -0.99
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- VGB Sequential number, Cl* Lynga 1 VGB NNN in Simbad
5 A1 --- Band [UBVRI] Photometric band
7- 11 F5.2 % Pol Percentage of polarisation
14- 17 F4.2 % e_Pol rms uncertainty on Pol
19- 24 F6.2 deg theta Polarisation angle
27- 31 F5.2 deg e_theta rms uncertainty on theta
33 I1 --- o_Band Number of observations in the Band
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History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Vannier [CDS] 27-Feb-2004