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 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 1979ApJS...40....1K). From the Straizys and Kuriliene
(1981Ap&SS..80..353S 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3a.dat 100 41 Physical parameters of stars in lower Cen-Cru
table3b.dat 101 141 Physical parameters of stars in upper Cen-Lup
table3c.dat 102 100 Physical parameters of stars in upper Sco
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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
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Bytes Format Units Label Explanations
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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
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Note (1): Walraven filter characteristics (nm):
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eff.l width cal(*)
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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
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(*) calibration in log(erg/s/cm2/Å)
Note (2): the proper motion membership from Blaauw (PhD, 1946) and Bertiau
(1958ApJ...128..533B 1958ApJ...128..533B)
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Acknowledgements:
The tables were prepared by Eric E. Mamajek (Rochester Univ.)
(End) Francois Ochsenbein [CDS] 29-Jan-2009