J/A+A/534/A114 UBV photometry in RCW173 (Marco+, 2011)
An obscured cluster associated with the HII region RCW173.
Marco A., Negueruela I.
<Astron. Astrophys. 534, A114 (2011)>
=2011A&A...534A.114M 2011A&A...534A.114M
ADC_Keywords: Clusters, open ; Photometry, UBV
Keywords: techniques: photometric - methods: observational -
Hertzsprung-Russell and C-M diagrams - Galaxy: stellar content -
open cluster and associations: individual: Alicante 6 -
techniques: imaging spectroscopy
Abstract:
The discovery of several clusters of red supergiants towards
l=24°-30° has triggered interest in this area of the Galactic
plane, where lines of sight are very complex and previous explorations
of the stellar content were very preliminary.
We attempt to characterise the stellar population associated with the
HII region RCW 173 (=Sh2-60), located at l=25.3°, as previous
studies have suggested that this population could be beyond the
Sagittarius arm.
Description:
UBV photometry for roughly 600 stars in the vicinity of the HII region
RCW 173 obtained with the Nordic Optical Telescope (La Palma) and
reduced with IRAF version of DAOPHOT. The stars are distributed in
three partially overlapping frames (A, B and C). Table 2 contains
stars in frame A. Table 3 contains stars in frame B. Table 4 contains
stars in frame C. Stars present in more than one frame are listed only
once.
We list X and Y positions with respect to each frame shown in Fig. 1
for all the stars in each frame, and their identification with objects
in the 2MASS catalogue, together with their coordinates (right
ascension (RA) and declination (DEC) in J2000). A few stars have no
obvious corresponding source in the 2MASS catalogue. We identified
these objects in the GLIMPSE catalogue (Benjamin et al.,
2003PASP..115..953B 2003PASP..115..953B) and assume their RA and DEC coordinates to be
those assigned in this catalogue. A few stars have no counterparts in
any of the two catalogues. The designation of each star is given by
the letter that identifies the frame on which it is detected, plus a
sequential number. Stars observed in more than one frame receive the
designation corresponding to the frame with the highest number of
measurements.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 108 322 (X,Y) position on the map A of stars with
photometry in the field.
table3.dat 108 99 (X,Y) position on the map B of stars with
photometry in the field.
table4.dat 108 176 (X,Y) position on the map C of stars with
photometry in the field.
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
http://www.astro.wisc.edu/glimpse/glimpsedata.html : GLIMPSE HomePage
Byte-by-byte Description of file: table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name Name (stars by the map ID A, B or C)
6- 13 F8.3 pix Xpos X Position (in pixels)
15- 22 F8.3 pix Ypos Y Position (in pixels)
24- 29 F6.3 mag Vmag V magnitude
31- 35 F5.3 mag e_Vmag V magnitude standard deviation
37- 42 F6.3 mag B-V (B-V) colour index
44- 48 F5.3 mag e_B-V (B-V) colour standard deviation
50- 55 F6.3 mag U-B (U-B) colour index
57- 61 F5.3 mag e_U-B (U-B) colour standard deviation
63- 64 I2 --- N Number of the photometric measures
66- 67 I2 h RAh ? Right Ascension in coordinates J2000
69- 70 I2 min RAm ? Right Ascension in coordinates J2000
72- 77 F6.3 s RAs ? Right Ascension in coordinates J2000
79 A1 --- DE- Declination sign in coordinates J2000
80- 81 I2 deg DEd ? Declination in coordinates J2000
83- 84 I2 arcmin DEm ? Declination in coordinates J2000
86- 90 F5.2 arcsec DEs ? Declination in coordinates J2000
92-108 A17 --- OName Name in the 2MASS (HHMMSSss+DDMMSSs) catalogue
or GLIMPSE catalogue (GHHMMSSss+DDMMSSs)
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Acknowledgements:
Amparo Marco, Amparo.Marco(at)ua.es
(End) Patricia Vannier [CDS] 05-Sep-2011