J/AN/333/60 Colour indices of selected OB stars (Krelowski+, 2012) ================================================================================ Limited diversity of the interstellar extinction law Krelowski J., Strobel A. =2012AN....333...60K ================================================================================ ADC_Keywords: Stars, OB ; Photometry, ultraviolet ; Photometry, UBV ; Photometry, infrared Keywords: ISM: clouds - ISM: molecules - dust, extinction Abstract: We have applied the method of investigating extinction curves using statistically meaningful samples that was proposed by us 25 years ago. The extensive data sets of the ANS (Astronomical Netherlands Satellite) and 2MASS (Two Micron All Sky Survey) were used, together with UBV photometry to create average extinction curves for samples of OB stars. Our results demonstrate that in the vast majority of cases the extinction curves are very close to the mean galactic extinction curve. Only a few objects were found to be obviously discrepant from the average. The latter phenomenon may be related to nitrogen chemistry in translucent interstellar clouds. Description: Tables contain V magnitudes and colour indices: (B-V), (U-V), (1500-V), (1800-V), (2200-V), (3300-V), (J-V), (H-V) and (K-V) of selected stars of spectral types: O9V, B0V, B1V, B1Ve, B2V and B3V. Spectral type of each star is according to SIMBAD. The stars are identified with their HD/BD numbers or names. The used photometry was taken from: U,B,V (in the Johnson System) from SIMBAD magnitudes at 5 ANS passbands (15, 18, 22, 25, 33) from Wesselius et al. (1982, Cat. II/97) J, H, K from IR 2MASS Catalog (Kleinmann et al., 1994Ap&SS.217...11K). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file o9.dat 85 78 O9V stars (Table A1 and A2 in the paper) b0.dat 85 31 B0V stars (Table A3 in the paper) b1e.dat 85 22 B1Ve stars (Table A4 in the paper) b1.dat 85 184 B1V stars (Tables A5, A6, A7 in the paper) b2.dat 85 143 B2V stars (Tables A8, A9, A10 in the paper) b3.dat 85 120 B3V stars (tables A11, A12, A13 in the paper) -------------------------------------------------------------------------------- See also: II/97 : ANS UV Catalogue of Point Sources (Wesselius+ 1982) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) Byte-by-byte Description of file: b0.dat b1.dat b1e.dat b2.dat b3.dat o9.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 A11 --- Name Star designation 13- 17 F5.2 mag Vmag Brightness at V 19- 23 F5.2 mag B-V B-V colour index 25- 29 F5.2 mag U-V ?=-9.99 U-V colour index 31- 36 F6.3 mag 15-V ?=-9.99 15-V colour index (1) 38- 43 F6.3 mag 18-V ?=-9.99 18-V colour index (1) 45- 50 F6.3 mag 22-V ?=-9.99 22-V colour index (1) 52- 57 F6.3 mag 25-V ?=-9.99 25-V colour index (1) 59- 64 F6.3 mag 33-V ?=-9.99 33-V colour index (1) 66- 71 F6.3 mag J-V ?=-9.99 J-V colour index 73- 78 F6.3 mag H-V ?=-9.99 H-V colour index 80- 85 F6.3 mag K-V ?=-9.99 K-V colour index -------------------------------------------------------------------------------- Note (1): The photometric bands are: -------------------------------------------------------------------------- Band designation 15N 15W 18 22 25 33 -------------------------------------------------------------------------- Central wavelength (nm) 154.5 154.9 179.9 220.0 249.3 329.4 Bandwidth (nm) 5.0 14.9 14.9 20.0 15.0 10.1 -------------------------------------------------------------------------- -------------------------------------------------------------------------------- Acknowledgements: Andrzej Strobel, strobel(at)astri.uni.torun.pl ================================================================================ (End) A. Strobel [Torun Centre for Ast.], Patricia Vannier [CDS] 19-Jan-2012