J/A+A/428/587 Cepheids BVRIJHK dereddened magnitudes (Kervella+, 2004)
Cepheid distances from infrared long-baseline interferometry.
III. Calibration of the surface brightness-color relations.
Kervella, P., Bersier, D., Mourard, D., Nardetto, N., Fouque, P.,
Coude du Foresto, V.
<Astron. Astrophys. 428, 587 (2004)>
=2004A&A...428..587K 2004A&A...428..587K
ADC_Keywords: Stars, variable ; Photometry, UBVRIJKLMNH ; Stars, diameters
Keywords: stars: variables: Cepheids - cosmology: distance scale -
stars: oscillations - techniques: interferometric
Abstract:
The recent VINCI/VLTI observations presented in Paper I (Kervalla et
al., 2004A&A...416..941K 2004A&A...416..941K) have nearly doubled the total number of
available angular diameter measurements of Cepheids. Taking advantage
of the significantly larger color range covered by these observations,
we derive in the present paper high precision calibrations of the
surface brightness-color relations using exclusively Cepheid
observations. These empirical laws allow to determine the distance to
Cepheids through a Baade-Wesselink type technique. The least dispersed
relations are based on visible-infrared colors, for instance
FV(V-K)=-0.1336±0.0008(V-K)+3.9530±0.0006. The convergence of the
Cepheid (this work) and dwarf stars (Kervella et al. 2004)
visible-infrared surface brightness-color relations is strikingly
good. The astrophysical dispersion of these relations appears to be
very small, and below the present detection sensitivity.
Description:
Angular sizes and photometric data for the 9 Cepheids that were
observed by long-baseline interferometry. The limb darkened angular
diameters (LD) were computed from the uniform disk values (UD)
available in the literature, using the conversion coefficients k=LD/UD
listed in Table 1 of the paper. The BVRIJHK magnitudes are
interpolated values, corrected for interstellar extinction.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 56 9 Star positions and magnitudes (from Simbad)
table3.dat 108 145 Interferometric and photometric data
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Cepheid name
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 20 F4.1 s RAs Right ascension (J2000.0)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0)
26- 27 I2 arcmin DEm Declination (J2000.0)
29- 30 I2 arcsec DEs Declination (J2000.0)
35- 38 F4.2 mag Bmag B magnitude
41- 44 F4.2 mag Vmag V magnitude
46- 56 A11 --- SpType MK Spectral type
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Cepheid name
10- 12 A3 --- Ref Reference for interferometric data (1)
15- 25 F11.3 --- JD ? Julian date of the interferometric measurement
28- 31 F4.2 um Lambda Wavelength of the interferometric measurement
34- 38 F5.3 --- Phase ? Pulsation phase (2)
41- 45 F5.3 mas UD Uniform disk angular diameter (milliarcsec)
48- 52 F5.3 mas e_UD Error bar on UD (milliarcsec)
55- 59 F5.3 mas LD Limb darkened angular diameter (milliarcsec)
62- 66 F5.3 mas e_LD Error bar on LD (milliarcsec)
69- 72 F4.2 mag B0mag Dereddened B magnitude (2)
75- 78 F4.2 mag V0mag Dereddened V magnitude (2)
81- 84 F4.2 mag R0mag ? Dereddened R magnitude (2)
87- 90 F4.2 mag I0mag ? Dereddened I magnitude (2)
93- 96 F4.2 mag J0mag ? Dereddened J magnitude (2)
99-102 F4.2 mag H0mag ? Dereddened H magnitude (2)
105-108 F4.2 mag K0mag ? Dereddened K magnitude (2)
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Note (1): References are indicated as follows:
K04 = Kervella et al. (2004A&A...416..941K 2004A&A...416..941K)
L02 = Lane et al. (2002ApJ...573..330L 2002ApJ...573..330L)
M97 = Mourard et al. (1997A&A...317..789M 1997A&A...317..789M);
N00 = Nordgren et al. (2000ApJ...543..972N 2000ApJ...543..972N)
N02 = Nordgren et al. (2002AJ....123.3380N 2002AJ....123.3380N)
Note (2): This paper, for references and formulae.
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Acknowledgements: Pierre Kervella
References:
Kervalla et al., Paper I 2004A&A...416..941K 2004A&A...416..941K
Kervalla et al., Paper II 2004A&A...423..327K 2004A&A...423..327K
(End) Pierre Kervella [Observatoire de Paris, France] 23-Jul-2004