J/A+A/611/A9 LDN 183 and LDN 169 Vilnius photometry (Straizys+, 2018)
High-latitude dust clouds LDN 183 and LDN 169: distances and extinctions.
Straizys V., Boyle R.P., Zdanavicius J., Janusz R., Corbally C.J.,
Munari U., Andersson B.-G., Zdanavicius K., Kazlauskas A., Maskoliunas M.,
Cernis K. Macijauskas M.
<Astron. Astrophys. 611, A9 (2018)>
=2018A&A...611A...9S 2018A&A...611A...9S (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Photometry, Vilnius
Keywords: stars: fundamental parameters -ISM: clouds - dust, extinction -
ISM: individual objects: LDN 169 -
ISM: individual objects: LDN 183 (MBM 37)
Abstract:
The interstellar extinction is investigated in a 2x2deg area
containing the dust and molecular clouds LDN 183 (MBM 37) and LDN 169,
centered at RA=15h54m, DEC=-3°. The study is based on
photometric classification in spectral and luminosity classes of 782
stars selected from the catalogs of 1299 stars down to V=20mag
observed in the Vilnius seven-color system. For control, the MK types
for 18 brightest stars with V between 8.5 and 12.8mag were determined
spectroscopically. For 14 stars, located closer than 200pc, distances
were calculated from trigonometric parallaxes taken from the Gaia Data
Release 1. For about 70% of the observed stars, two-dimensional
spectral types, interstellar extinctions Av and distances were
determined. Using 57 stars closer than 200pc we estimate that the
front edge of the clouds begins at 105±8pc. The extinction layer
in the vicinities of the clouds can be about 20pc thick. In the outer
parts of the clouds and between the clouds the extinction is
2.0-2.5mag. Behind the Serpens/Libra clouds the extinction range does
not increase; this means that the dust layer at 105pc is a single
extinction source.
Description:
Table 1 contains the results of photometry of 830 stars down to
V=15mag in the Vilnius seven-color system in a 2x2deg area centered on
on the cloud LDN 183 at RA(J2000)=15h54m, Dec(J2000)=-03deg00arcmin.
Photometric data are used to classify stars in spectral and luminosity
classes. The identification numbers, coordinates, V magnitudes, six
color indices in the Vilnius system, the uncertainties of V magnitudes
and color indices and photometric spectral types are given. The
coordinates are from PPMXL catalog (Roeser et al. 2010AJ....139.2440R 2010AJ....139.2440R,
Cat. I/317).
Table 2 contains the results of photometry of 483 stars down to
V=20mag in the Vilnius system in seven 12x12-arcmin areas observed
with the VATT 1.8m telescope. The same data as in Table 1 are given.
The identification numbers start from from 1001 to avoid confusion
with Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 128 830 Catalogue of stars observed in the Vilnius
seven-color system at the Moletai observatory
table2.dat 128 483 Catalogue of stars observed in the Vilnius
seven-color system at the Mount Graham observatory
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number (1)
6- 7 I2 h RAh Right ascension (J2000.0)
9- 10 I2 min RAm Right ascension (J2000.0)
12- 16 F5.2 s RAs Right ascension (J2000.0)
18 A1 --- DE- Declination sign (J2000.0)
19- 20 I2 deg DEd Declination (J2000.0)
22- 23 I2 arcmin DEm Declination (J2000.0)
25- 28 F4.1 arcsec DEs Declination (J2000.0)
30- 35 F6.3 mag Vmag V magnitude (Vilnius system)
37- 41 F5.3 mag e_Vmag Error of Vmag
43- 47 F5.3 mag U-V ? U-V colour index (Vilnius system)
49- 53 F5.3 mag e_U-V ? Error of U-V
55- 59 F5.3 mag P-V ? P-V colour index (Vilnius system)
61- 65 F5.3 mag e_P-V ? Error of P-V
67- 71 F5.3 mag X-V X-V colour index (Vilnius system)
73- 77 F5.3 mag e_X-V Error of X-V
79- 83 F5.3 mag Y-V Y-V colour index (Vilnius system)
85- 89 F5.3 mag e_Y-V Error of Y-V
91- 95 F5.3 mag Z-V Z-V colour index (Vilnius system)
97-101 F5.3 mag e_Z-V Error of Z-V
103-107 F5.3 mag V-S ? V-S colour index (Vilnius system)
109-113 F5.3 mag e_V-S ? Error of V-S
115-123 A9 --- SpType Photometric spectral type (2)
125-128 A4 --- Note Flag on spectral classification (3)
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Note (1): No 1-830 in table1.dat, 1001-1483 in table2.dat.
Note (2): Photometric spectral types are given in lower case letters.
Note (3): Flag as follows:
am: = possible Am star
bin = binary star
bin: = suspected binary star
md: = suspected metal-deficient star
mdG: = suspected metal-deficient giant star
sd: = suspected subdwarf
WDS = star in the Washington Double Star Catalog (2001AJ....122.3466M 2001AJ....122.3466M)
gal? = galaxy?
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Acknowledgements:
Vytautas Straizys, Vytautas.Straizys(at)tfai.vu.lt
(End) V. Straizys [Vilnius Univ., Lithuania], P. Vannier [CDS] 18-Dec-2017