J/MNRAS/437/1628 NGC 7142 Vilnius photometry (Straizys+, 2014)
The open cluster NGC 7142: interstellar extinction, distance and age.
Straizys V., Maskoliunas M., Boyle R.P., Zdanavicius K., Zdanavicius J.,
Laugalys V., Kazlauskas A.
<Mon. Not. R. Astron. Soc., 437, 1628-1635 (2014)>
=2014MNRAS.437.1628S 2014MNRAS.437.1628S
ADC_Keywords: Clusters, open ; Photometry, Vilnius
Keywords: stars: fundamental parameters - dust, extinction -
open clusters and associations: individual: NGC 7142
Abstract:
The results of medium-band photometry of 1037 stars in the area of the
old open cluster NGC 7142 down to V=20.1mag in the Vilnius
seven-colour system are presented. Photometric results are used to
classify in spectral and luminosity classes about 80 per cent of stars
down to V=18.5mag, to identify cluster members, to determine the main
cluster parameters and to investigate the interstellar extinction in
this direction. The average extinction AV of the cluster is about
1.1mag [E(B-V)=0.35], and its distance is 2.3kpc (the distance modulus
11.8mag). The age of the cluster, 3.0Gyr, is estimated from the
intrinsic colour-magnitude diagram with individual dereddening of each
star and the Padova isochrones. The surface distribution of the
extinction is shown. The reddening of the eclipsing variable V375 Cep
is found to be close to the average reddening of the cluster.
Probably, the cluster contains five red clump giants, two asymptotic
branch stars and four blue stragglers.
Description:
The observations were obtained by one of the authors (RPB) in 2009
October 18-21 with the 1.8-m telescope of the Vatican Observatory on
Mt. Graham (Arizona) equipped with a 4K backside illuminated CCD
camera and liquid nitrogen cooling.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 107 1037 Results of photometry and classification of stars
in the NGC 7142 area measured in the Vilnius
7-colour system
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See also:
J/PASP/103/536 : CCD Photometry of NGC 7142 (Crinklaw+ 1991)
J/AJ/134/1216 : NGC 7142, 6939 & IC 4756 stars abundances (Jacobson+, 2007)
J/BaltA/21/465 : Vilnius photometry in NGC7129 & NGC7142 (Maskoliunas+, 2012)
J/MNRAS/438/1848 : NGC 7129 Vilnius photometry (Straizys+, 2014)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/1037] Sequential number
6- 7 I2 h RAh Right ascension (J2000) (1)
9- 10 I2 min RAm Right ascension (J2000) (1)
12- 16 F5.2 s RAs Right ascension (J2000) (1)
18 A1 --- DE- Declination sign (J2000) (1)
19- 20 I2 deg DEd Declination (J2000) (1)
22- 23 I2 arcmin DEm Declination (J2000) (1)
25- 28 F4.1 arcsec DEs Declination (J2000) (1)
30- 35 F6.3 mag Vmag [10.7/20.2] Vilnius V magnitude
37- 41 F5.3 mag U-V ?=- Vilnius U-V colour index
42 A1 --- u_U-V Uncertainty flag on U-V (2)
44- 48 F5.3 mag P-V ?=- Vilnius P-V colour index
49- 50 A2 --- u_P-V [: ] Uncertainty flag on P-V (2)
52- 56 F5.3 mag X-V Vilnius X-V colour index
57- 58 A2 --- u_X-V [: ] Uncertainty flag on X-V (2)
59- 63 F5.3 mag Y-V Vilnius Y-V colour index
65- 69 F5.3 mag Z-V Vilnius Z-V colour index
70- 71 A2 --- u_Z-V [: ] Uncertainty flag on Z-V (2)
72- 76 F5.3 mag V-S ? Vilnius V-S colour index
77- 78 A2 --- u_V-S [: ] Uncertainty flag on V-S (2)
79- 87 A9 --- SpType Photometric MK spectral type
89- 93 F5.3 mag sigQ [0.001/0.064]? Accuracy σQ of
the classification (3)
95- 99 F5.2 mag AV ? Interstellar extinction in V band
101 A1 --- Mmb [m] Cluster membership
103-107 A5 --- Note Notes (4)
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Note (1): The coordinates are from the PPMXL catalogue rounded to two decimals
of time second and to one decimal of arcsecond.
Note (2): Colour indices with the errors 0.05-0.10mag are marked by colons.
Note (3): the accuracy of the classification depends on σQ:
* good accuracy if σQ≤0.02mag
* reasonable accuracy if σQ withing 0.02-0.03mag
* low accuracy if σQ>0.03
Note (4): Notes as follows:
1 = Radial velocities and metallicities determined by Jacobson et al.
(2007AJ....134.1216J 2007AJ....134.1216J, Cat. J/AJ/134/1216, 2008AJ....135.2341J 2008AJ....135.2341J)
2 = Radial velocities and metallicities determined by Friel et al.
(1989PASP..101.1105F 1989PASP..101.1105F) and Friel & Janes (1993A&A...267...75F 1993A&A...267...75F)
3 = Red clump giants of NGC 7142 (Sandquist et al., 2011AJ....142..194S 2011AJ....142..194S,
and this paper)
4 = Images are asymmetrical or with close neighbours, double or multiple stars
5 = BD+65 1642
6 = Variable (Sandquist et al., 2011AJ....142..194S 2011AJ....142..194S, 2013AJ....146...40S 2013AJ....146...40S)
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History:
From electronic version of the journal
References:
Maskoliunas et al., Paper I 2012BaltA..21..465M 2012BaltA..21..465M, Cat. J/BaltA/21/465
Straizys et al., Paper III 2014MNRAS.438.1848S 2014MNRAS.438.1848S, Cat. J/MNRAS/438/1848
(End) Patricia Vannier [CDS] 20-Nov-2014