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J/A+A/216/44        Walraven photometry in Sco-Cen association  (De Geus+, 1989)

Physical parameters of stars in the Scorpio-Centaurus OB association. De Geus E.J., De Zeeuw P.T., Lub J. <Astron. Astrophys., 216, 44-61 (1989)> =1989A&A...216...44D
ADC_Keywords: Associations, stellar ; Photometry, VBLUW ; Effective temperatures Keywords: clusters: associations ; distance ; photometry ; stars: Hertzspring-Russel diagram Abstract: Walraven photometry is presented of established and probable members of the Scorpio-Centaurus OB association. For each star, effective temperature and surface gravity are derived using Kurucz atmosphere models (1979ApJS...40....1K). From the Straizys and Kuriliene (1981Ap&SS..80..353S) tables, absolute magnitudes are calculated. Distance moduli and visual extinctions are determined for all stars. From a comparison of the HR-diagrams of the stars in each subgroup with theoretical isochrones, the ages of the three subgroups are derived. The distances to the three subgroups are shown to be different; there is a general trend (also within each subgroup) for the distances to be larger at higher galactic longitudes. The visual extinction in the youngest subgroup Upper-Scorpius, is well correlated with the IRAS 100-micron map. The distance toward the Ophiuchus dark clouds is found to be 125 pc, based on the photometric distances to the stars. Most of the early-type stars in Upper-Scorpius are located at the far side of the dark clouds. Description: Stars in the Sco-Cen association were observed in the Walraven photometric system during several observing sessions during the months of April tp August in the years 1983 to 1987. The five bands V B L U W are observed simultaneously, and the mean rms errors are 0.0016 in V, 0.0008 in (V-B), 0.0010 in (B-U), 0.0009 in (U-W) and 0.0007 in (B-L). The physical parameters Teff, log(g), luminosity, distances and membership are derived. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3a.dat 102 41 Physical parameters of stars in lower Cen-Cru table3b.dat 102 141 Physical parameters of stars in upper Cen-Lup table3c.dat 102 100 Physical parameters of stars in upper Sco
See also: J/ApJS/82/117 : UBV and H-β in Sco-Cen association (Slawson+, 1992) J/A+A/356/541 : T Tauri stars in the Sco-Cen OB association (Koehler+, 2000) J/A+A/448/1001 : Radial velocities of B stars in Sco-Cen (Jilinski+, 2006) J/AJ/124/1670 : Post-T Tauri Stars in Sco-Cen Association (Mamajek+, 2002) J/PAZh/33/643 : Kinematics of Sco-Cen OB Association (Bobylev+, 2007) Byte-by-byte Description of file: table3*.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number of the star 8- 14 F7.3 deg Glon Galactic longitude 16- 22 F7.3 deg Glat Galactic latitude 25- 31 F7.4 mag [B-U] Reddenning-free parameter (B-U)-0.61(V-B) (1) 33- 39 F7.4 mag [U-W] Reddenning-free parameter (U-W)-0.45(V-B) (1) 41- 47 F7.4 mag [B-L] Reddenning-free parameter (B-L)-0.39(V-B) (1) 49- 52 F4.2 [K] logTe Effective temperature (from photometry) 54- 57 F4.2 [cm/s2] logg Gravity (from photometry) 59- 61 F3.1 [Lsun] logL Luminosity (in solar units) 63- 67 F5.2 mag mv Johnson V magnitude (estimated σ=0.015) 69- 72 F4.1 mag Mv Absolute magnitude 74- 78 F5.2 mag Av Absorption (assuming R=3.2) 80- 83 F4.1 mag DM Distance modulus DM = mv-MV+Av+5 (estimated σ=0.3) 85- 88 I4 pc Dist Heliocentric distance 90 A1 --- Mmb [Mm] Membership: M=member from proper motion, m=member from photometry, blank=non-member (2) 92-102 A11 --- SpType MK spectral type
Note (1): Walraven filter characteristics (nm): ----------------------- eff.l width cal(*) ----------------------- V 544.1 70.8 -11.172 B 429.8 42.3 -10.910 L 383.7 22.1 -10.818 U 362.3 23.2 -10.793 W 323.5 15.7 -10.673 ----------------------- (*) calibration in log(erg/s/cm2/Å) Note (2): the proper motion membership from Blaauw (PhD, 1946) and Bertiau (1958ApJ...128..533B)
Acknowledgements: The tables were prepared by Eric E. Mamajek (Rochester Univ.)
(End) Francois Ochsenbein [CDS] 29-Jan-2009
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