J/AJ/102/642 UBV photometry in Westerlund 2 (Moffat+, 1991)
New Wolf-Rayet stars in galactic open clusters: Sher 1 and the giant HII region
core Westerlund 2.
Moffat A.F.J., Shara M.M., Potter M.
<Astron. J., 102, 642-653 (1991)>
=1991AJ....102..642M 1991AJ....102..642M
ADC_Keywords: Photometry, UBV ; Clusters, open
Abstract:
Two new Galactic Wolf-Rayet stars were found in open clusters:
a WN4 star in the O9 cluster Sher 1 and a WN7 star in the O7 cluster
Westerlund 2. This confirms a previous trend, namely that fainter,
hotter WN stars tend to be older than brighter, cooler WN stars.
This may be a consequence of evolution via extreme mass loss.
Description:
The table "west2.dat" contains the results of the paper for the
cluster Westerlund 2, which was observed in 1989 April at the South
African Astronomical Observatory (SAAO), and in 1989 June at CTIO for
the UBV CCD photometry. The (x,y) positions of the studied stars are
from WEBDA (http://www.univie.ac.at/webda/), and the position computed
at CDS using the UCAC4 (Cat. I/322) as a reference catalog.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
west2.dat 94 90 Positions, identifications, UBV, membership and
spectral types in Westerlund 2 (from tables 2+3)
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Byte-by-byte Description of file (# headlines): west2.dat
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Bytes Format Units Label Explanations
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2- 3 I2 h RAh Right Ascension J2000 (hours) (1)
5- 6 I2 min RAm Right Ascension J2000 (minutes) (1)
8- 12 F5.2 s RAs Right Ascension J2000 (seconds) (1)
14 A1 --- DE- Declination J2000 (sign) (1)
15- 16 I2 deg DEd Declination J2000 (degrees) (1)
18- 19 I2 arcmin DEm Declination J2000 (minutes) (1)
21- 24 F4.1 arcsec DEs Declination J2000 (seconds) (1)
29- 35 F7.2 pix Xpos CCD position (from WEBDA)
37- 43 F7.2 pix Ypos CCD position (from WEBDA)
47- 49 A3 --- --- [MSP]
51- 53 I3 --- MSP [18/444] Identification of the star in paper,
<Cl* Westerlund 2 MSP NNN> in Simbad
55- 57 A3 --- --- [=MV]
59- 60 I2 --- MV [1/9]? ID in Moffat & Vogt (1975A&AS...20..125M 1975A&AS...20..125M)
<Cl* Westerlund 2 MV NN> in Simbad
65- 69 F5.2 mag Vmag Johnson V-band magnitude
71- 75 F5.2 mag B-V Johnson B-V color index
77- 81 F5.2 mag U-B Johnson U-B color index
84- 85 A2 --- Mm [m nm] Membership status (member or non-member)
88- 94 A7 --- Sp MK spectral type for 9 stars (from table3)
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Note (1): position computed at CDS from (Xpos,Ypos),
should be accurate to ±0.3arcsec
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History:
* 26-Mar-2015: Prepared at CDS
(End) Francois Ochsenbein [CDS] 26-Mar-2015