Access to Astronomical Catalogues

← Click to display the menu
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact