J/BaltA/20/27 NGC 752 Vilnius photometry (Bartasiute+, 2011)
Vilnius multicolor CCD photometry of the open cluster NGC 752.
Bartasiute S., Janusz R., Boyle R.P., Philip A.G.D.
<Baltic Astron., 20, 27-52 (2011)>
=2011BaltA..20...27B 2011BaltA..20...27B
ADC_Keywords: Clusters, open ; Photometry, Vilnius
Keywords: techniques: photometric - stars: fundamental parameters -
Galaxy: open clusters: individual (NGC 752) - Galaxy: stellar content
Abstract:
We have performed multicolor CCD observations of the central area of
NGC 752 to search for faint, low-mass members of this open cluster.
Four 12'x12' fields were taken on the 1.8m Vatican Advanced Technology
Telescope (Mt. Graham, Arizona) using a 4K CCD camera and eight
intermediate-band filters of the Stromvil (Stromgren + Vilnius)
system. In this paper we present a catalog of photometry for 405 stars
down to the limiting magnitude V=18.5, which contains V magnitudes and
color indices of the Vilnius system, together with photometric
determinations of spectral types, absolute magnitudes MV ,
interstellar reddening values E(Y-V) and metallicity parameters
[Fe/H]. The good quality multicolor data made it possible to identify
the locus of the lower main sequence to four magnitudes beyond the
previous (photographic) limit. A relatively small number of
photometric members identified at faint magnitudes seems to be
indicative of actual dissolution of the cluster from the low-mass end.
Description:
The multicolor observations in eight intermediate-band filters of the
Stromvil (Stromgren + Vilnius) system were obtained during two
separate runs, on the nights 2007 November 2-8 (run "SQ") and six
nights between 2008 October 28 and November 5 (run "SU"), using a 4K
CCD camera on the 1.8m VATT telescope on Mt. Graham, Arizona.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 405 Photometry in the area of NGC 752 with VATT
(Vatican Advanced Technology Telescope, Arizona)
table3.dat 83 405 Photometric parameters for stars in the area
of NGC 752
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See also:
I/177 : Proper motions in NGC 752 (Platais 1992)
J/PASP/106/281 : Photometry and radial velocities in NGC752 (Daniel+, 1994)
J/A+A/339/423 : Velocities of red giants in NGC 752 (Mermilliod+ 1998)
J/A+A/490/113 : X-ray sources in NGC 752 (Giardino+, 2008)
J/MNRAS/446/3562 : Red giants abundances in NGC752 (Bocek Topcu+, 2015)
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 [1/405] Sequential number
5- 7 I3 --- Hein [1/396]? Heinemann (1926AN....227..193H 1926AN....227..193H) number
in Simbad
9 I1 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 17 F4.1 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 27 I2 arcsec DEs Declination (J2000)
29- 34 F6.3 mag Vmag Vilnius V magnitude
36- 40 F5.3 mag U-V ?=- Vilnius U-V colour index
42- 46 F5.3 mag P-V ?=- Vilnius P-V colour index
48- 52 F5.3 mag X-V ?=- Vilnius X-V colour index
54- 58 F5.3 mag Y-V ?=- Vilnius Y-V colour index
60- 64 F5.3 mag Z-V ?=- Vilnius Z-V colour index
66- 70 F5.3 mag V-S ?=- Vilnius V-S colour index
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/405] Sequential number
5- 7 I3 --- Hein [1/396]? Heinemann (1926AN....227..193H 1926AN....227..193H) number
in Simbad
9 I1 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 17 F4.1 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 27 I2 arcsec DEs Declination (J2000)
29- 33 F5.2 mag Vmag Vilnius V magnitude
35- 49 A15 --- SpType Photometric spectral type (3)
51- 55 F5.3 mag (Y-V)0 ?=- Deredenned Vilnius Y-V colour index
57- 61 F5.3 mag E(Y-V) ?=- Redenning
63- 68 F6.3 mag VMAG ?=- Absolute V-band magnitude
69- 74 F6.3 [Sun] [Fe/H] ? Metallicity
75- 79 F5.3 mag DCI ?=- Minimum rms difference, between the
corresponding intrinsic color indices of
that star and the standards found
81- 82 A2 --- Mm [pm M] Membership flag (1)
83 A1 --- Note [*] * indicates a note (2)
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Note (1): Membership flag:
M = probable member known from the literature
pm = photometric member identified from Vilnius photometry
Note (2): Individual notes:
66 = Alternative classification: G5, sd; (Y-V)0=0.59, MV=4.5, [Fe/H]=-0.9
158 = Alternative classification: G8 V; (Y-V)0=0.58, MV=5.1, [Fe/H]=-0.5
164 = Alternative classification: G8, sd; (Y-V)0=0.62, MV=6.3, [Fe/H]=-1.1
174 = Assuming the reddening E(Y-V)=0.048, the indices (P-X)0 and (X-Y)0
give [Fe/H]< -3.0
191 = Error in Y-V too large (σY-V=0.094), parameters obtained using the
remaining color indices
195 = Alternative classification: F7, sd; (Y-V)0=0.53, MV=4.0, [Fe/H]=-2.2
219 = Classification impossible due to large errors of color indices
261 = Alternative classification: F8, sd; (Y-V)0=0.60, MV=4.1, [Fe/H]=-1.9
267 = Large error in Y-V, parameters obtained using the remaining color indices
273 = The eclipsing binary QX And. Hence the large classification error
286 = Nonmember by radial-velocity analysis (Daniel et al.,
1994PASP..106..281D 1994PASP..106..281D, Cat; J/PASP/106/281)
338 = Nonmember by proper-motion analysis (Platais 1991).
368 = Alternative classification: F8, sd; (Y-V)0=0.53, MV=4.4, [Fe/H]=-1.8
371 = Large error in Y-V, parameters obtained using the remaining color indices
Note (3): lower-case letters are used; designations. In addition:
sd = subdwarf
mdg = metal-deficient giant ([Fe/H]≤-0.6)
mdsg = metal-deficient subgiant ([Fe/H]≤-0.6)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Mar-2015