J/A+A/326/1044 Eclipsing binaries uvbyHbeta photometry (Jordi+ 1997)
Photometric versus empirical surface gravities of eclipsing binaries
Jordi C., Ribas I., Torra J., Gimenez A.
<Astron. Astrophys. 326, 1044 (1997)>
=1997A&A...326.1044J 1997A&A...326.1044J (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, uvby, beta
Keywords: Stars: fundamental parameters - Stars: binaries: eclipsing -
Stars: early-type - Stars: late-type
Abstract:
Systematic differences in photometric stellar surface gravity
determination are studied by means of the comparison with empirical
values derived from detached double-lined eclipsing binaries.
Photometric gravities were computed using Moon & Dworetsky
(1985MNRAS.217..305M 1985MNRAS.217..305M) grids based on Kurucz (1979ApJS...40....1K 1979ApJS...40....1K)
atmosphere models, and empiric al gravities were taken from Andersen
(1991A&ARv...3...91A 1991A&ARv...3...91A). Individual Stroemgren colours and β
indices of each component of the binary system have to be taken
into account to correctly analyze the observed differences. A
compilation of data on a sample containing 30 detached double-lined
eclipsing binaries with accurate (≃1-2%) determination of mass and
radius and available uvbyHβ photometric data is also presented.
Correction of the differences in terms of Teff and logg for the
range 11000K<Teff<20000K reduces the mean residuals from 0.13dex to
0.07dex. For the range 7000K<Teff<8500K, the consideration of
metallicity effects by means of δmo index improves the
accuracy from 0.20dex to 0.09dex.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 125 60 uvbyHβ photometry for 30 detached
eclipsing binaries
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Name Identification name (Name, HD, BD)
13 A1 --- m_Name Component: A=primary, B=secondary
16- 20 A5 --- SpType Spectral type
22- 23 I2 h RAh Right Ascension J2000 (hours) (4)
25- 26 I2 min RAm Right Ascension J2000 (minutes) (4)
28- 31 F4.1 s RAs Right Ascension J2000 (seconds) (4)
33 A1 --- DE- Declination J2000 (sign) (4)
34- 35 I2 deg DEd Declination J2000 (degrees) (4)
37- 38 I2 arcmin DEm Declination J2000 (minutes) (4)
40- 41 I2 arcsec DEs Declination J2000 (seconds) (4)
43- 48 F6.3 mag Vmag Visual apparent magnitude
50- 53 F4.3 mag e_Vmag ? Error in Vmag
55- 59 F5.3 mag (b-y) b-y index
61- 64 F4.3 mag e_(b-y) ? Error in b-y
66- 70 F5.3 mag m1 m1 index ((v-b) - (b-y))
72- 75 F4.3 mag e_m1 ? Error in m1
77- 81 F5.3 mag c1 c1 index ((u-v) - (v-b))
83- 86 F4.3 mag e_c1 ? Error in c1
88- 92 F5.3 mag beta Hβ index
94- 97 F4.3 mag e_beta ? Error in beta
99-103 F5.3 [cm/s2] logg(emp) ? Empirical determination of logg (1)
105-108 F4.2 [cm/s2] logg(MD) ? Photometric determination of logg (2)
110-113 F4.2 [cm/s2] logg(cor) ? Corrected photometric determination of logg
115-119 I5 K Teff(MD) ? Photometric determination of
effective temperature (2)
121-122 A2 --- Notes Notes (3)
--------------------------------------------------------------------------------
Note (1): From light and radial velocity curve analysis. Errors in logg(emp)
can be found in Andersen (1991A&ARv...3...91A 1991A&ARv...3...91A) and range from
0.007 to 0.025dex with a mean value of 0.014dex.
Note (2): Photometric determination using MD grids and NSW interpolation.
Estimated errors in logg(MD) and Teff(MD) increase from 0.15 to
0.30dex and from 200 to 1200K, respectively, when the temperature
increases from 6000 to 20000K
Note (3):
a. Clausen J.V., 1991A&A...246..397C 1991A&A...246..397C
b. Clausen J.V., 1996A&A...308..151C 1996A&A...308..151C
c. Nordstroem B., Johansen K.T., 1994A&A...282..787N 1994A&A...282..787N
d. Nordstroem B., Johansen K.T., 1994A&A...291..777N 1994A&A...291..777N
e. Popper D.M., Andersen J., Clausen J.V., Nordstrom B., 1985AJ.....90.1324P 1985AJ.....90.1324P
f. Andersen J., Clausen J.V., 1989A&A...213..183A 1989A&A...213..183A
g. Andersen J., Clausen J.V., Nordstrom, B., Reipurth B., 1983A&A...121..271A 1983A&A...121..271A
h. This work
i. Gronbech B., Gyldenkerne K., Jorgensen H.E., 1977A&A....55..401G 1977A&A....55..401G
j. Clausen J.V., Gimenez A., 1991A&A...241...98C 1991A&A...241...98C
k. Clausen J.V., Nordstrom B., 1980A&A....83..339C 1980A&A....83..339C
l. Luminosity ratios from Jorgensen H.E., Gyldenkerne K., 1975A&A....44..343J 1975A&A....44..343J
m. Jorgensen H.E., Gronbech B., 1978A&A....66..377J 1978A&A....66..377J
n. Gimenez A., 1994, private communication
o. Clausen J.V., Nordstrom B., 1978A&A....67...15C 1978A&A....67...15C
p. Andersen J., Clausen J.V., Gimenez A., 1993A&A...277..439A 1993A&A...277..439A
q. Andersen J., Clausen J.V., Nordstrom B., 1987A&A...175...60A 1987A&A...175...60A
r. Clausen J.V., Gronbech B., 1976A&A....48...49C 1976A&A....48...49C
s. Clausen J.V., Gimenez A., Scarfe C.D., 1986A&A...167..287C 1986A&A...167..287C
t. Andersen J., Clausen J.V., Nordstrom B., 1990A&A...228..365A 1990A&A...228..365A
u. VandenBerg D.A., Hrivnak B.J., 1985ApJ...291..270V 1985ApJ...291..270V
v. Clausen J.V., Gyldenkerne K., Gronbech B., 1976A&A....46..205C 1976A&A....46..205C
w. Luminosity ratios from Vaz L.P.R., Andersen J., 1984A&A...132..219V 1984A&A...132..219V
x. Andersen J., Clausen J.V., Nordstrom B., 1984A&A...134..147A 1984A&A...134..147A
y. Clausen J.V., Gyldenkerne K., Gronbech B., 1977A&A....58..121C 1977A&A....58..121C
z. Andersen J., Clausen J.V., Nordstrom B., Popper D.M., 1985A&A...151..329A 1985A&A...151..329A
aa. Clausen J.V., Gronbech B., 1977A&A....58..131C 1977A&A....58..131C
ab. Andersen J., Clausen J.V., Nordstrom B., 1984A&A...137..281A 1984A&A...137..281A
* beta{A} and beta{B} computed from joint beta and beta{Min I}
Note (4): The coordinates have been added at CDS.
--------------------------------------------------------------------------------
Acknowledgements: Carme Jordi
(End) Patricia Bauer [CDS] 29-May-1997