J/ApJS/159/100 Temperatures and Rc photometry in the Hyades (Taylor+, 2005)
A catalog of temperatures and red Cousins photometry for the Hyades.
Taylor B.J., Joner M.D.
<Astrophys. J. Suppl. Ser., 159, 100 (2005)>
=2005ApJS..159..100T 2005ApJS..159..100T
ADC_Keywords: Clusters, open ; Effective temperatures; Photometry, Cousins
Keywords: Hertzsprung-Russell diagram -
open clusters and associations: individual (Hyades) -
stars: abundances - stars: fundamental parameters
Abstract:
Using Hyades photometry published by Mendoza (1967BOTT....4..149M 1967BOTT....4..149M) and
other authors, Pinsonneault et al. (2004ApJ...600..946P 2004ApJ...600..946P) have recently
concluded that Cousins V-I photometry published by Taylor & Joner
(1985AJ.....90..479T 1985AJ.....90..479T, 1988AJ.....96..211T 1988AJ.....96..211T, 1996AJ....111.1338T 1996AJ....111.1338T) is not
on the Cousins system. Extensive tests of the Taylor-Joner photometry
and other pertinent results are therefore performed in this paper.
It is found that in part, the Pinsonneault et al. conclusion rests on
(1) a systematic error in Mendoza's (R-I)J photometry and (2) a
small error in an approximate Johnson-to-Cousins transformation
published by Bessell. For the Taylor-Joner values of (V-R)C, it is
found that there are possible (though not definite) differences of
several mmag with other results. However, the Taylor-Joner values of
(R-I)C data are supported at the 1mmag level. Using the (R-I)C
data and other published results, an (R-I)C catalog is assembled for
146 Hyades stars with spectral types earlier than about K5. For single
stars with multiple contributing data, the rms errors of the catalog
entries are less than 4.4 mmag. Temperatures on the Di Benedetto
angular-diameter scale are also given in the catalog and are used to
help update published analyses of high-dispersion values of [Fe/H] for
the Hyades. The best current mean Hyades value of [Fe/H] is found to
be +0.103±0.008dex and is essentially unchanged from its previous
value. In addition to these numerical results, recommendations are
made about improving attitudes and practices that are pertinent to
issues like those raised by Pinsonneault et al.
Description:
table6.dat contains "kind 1" values of theta [= 5040/T(eff)] and
Cousins R-I for 104 Hyades stars that may be treated as single stars.
For each value of R-I, the rms error is 4.3 mmag or less, and a
consistency check of data from at least two sources has been
performed.
table7.dat contains "kind 2" values of theta [= 5040/T(eff)] and
Cousins R-I for 16 Hyades stars that may be treated as single stars.
For some listed values of R-I, only one source datum is available. For
the remainder, the rms error is greater than 4.3 mmag.
table8.dat contains "kind 3" values of theta [= 5040/T(color)] for 26
Hyades binaries. For wavelengths near 5500Å, each listed value of
T(color) represents the effective temperature of a single star with
the same short-wavelength color indices as those of the binary.
For wavelengths near 7000Å, similar reasoning applies, with
long-wavelength color indices being considered.
For all tables, values of theta are based on the temperature scale of
Di Benedetto (1998, Cat. J/A+A/339/858)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 39 104 Kind 1 catalog of R-I and theta
table7.dat 39 16 Kind 2 catalog of R-I and theta
table8.dat 39 26 Kind 3 catalog of theta values
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See also:
J/A+A/339/858 : Calibration of stellar parameters (Di Benedetto 1998)
Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- vB ?=-1 van Bueren number (-1 = no entry),
Cl Melotte 25 NNN in Simbad
5- 14 A10 --- Name Hic, HD or HR designation
15 A1 --- m_Name [AB] "A" or "B" for binary components
17- 18 A2 --- n_Name Type of object (1)
20- 24 F5.3 mag (R-I)c Cousins R-I colour index
26- 28 F3.1 mmag e_(R-I)c Standard deviation for Cousins R-I (in mmag)
30- 34 F5.3 K-1 theta theta = 5040/T(eff)
36- 39 F4.1 K-1 e_theta 1000 times standard deviation for theta
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Note (1): Type of object as follows:
N = dwarf non-binary
S = dwarf binary treated as single star
G = giant
GS = giant-star binary treated as single star
K = late K dwarf
KS = late K dwarf binary treated as single star
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Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- vB ?=-1 van Bueren number (-1 = no entry),
Cl Melotte 25 NNN in Simbad
5- 14 A10 --- Name Hic or HD designation
17 A1 --- n_Name [B] "B" = binary
20- 24 F5.3 --- theta1 theta = 5040/T(color) (near 5500Å)
26- 28 F3.1 --- e_theta1 1000 times standard deviation for theta
30- 34 F5.3 --- theta2 theta = 5040/T(color) (near 7000Å)
36- 39 F4.1 --- e_theta2 1000 times standard deviation for theta
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Acknowledgements: Benjamin Taylor, taylorb(at)byu.edu
(End) Benjamin Taylor [Brigham Young Univ.], Patricia Vannier [CDS] 29-Mar-2005