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J/AJ/119/1448   Improved properties for cool stars       (Houdashelt+, 2000)

Improved color-temperature relations and bolometric corrections for cool stars Houdashelt M.L., Bell R.A., Sweigart A.V. <Astron. J. 119, 1448 (2000)> =2000AJ....119.1448H
ADC_Keywords: Colors ; Models, atmosphere ; Photometry, Cousins ; Photometry, UBVRI ; Stars, F-type ; Stars, G-type ; Stars, K-type Keywords: infrared radiation - stars: atmospheres - stars: evolution - stars: fundamental parameters - stars: late-type Abstract: We present new grids of colors and bolometric corrections for F-K stars having 4000 K ≤ Teff ≤ 6500 K, 0.0 ≤ log(g) ≤ 4.5, and -3.0 ≤ [Fe/H] ≤ 0.0. Colors are tabulated for Johnson U-V and B-V, Cousins V-R and V-I, Johnson-Glass V-K, J-K, and H-K, and CIT/CTIO V-K, J-K, H-K, and CO. We have developed these color-temperature relations by convolving synthetic spectra with the best-determined, photometric filter transmission profiles. The synthetic spectra have been computed with the SSG spectral synthesis code (Bell & Gustafsson 1978; Gustafsson & Bell 1979) using MARCS stellar atmosphere models (Gustafsson et al. 1975; Bell et al. 1976) as input. Both of these codes have been improved substantially, especially at low temperatures, through the incorporation of new opacity data. The resulting synthetic colors have been put onto the observational systems by applying color calibrations derived from models and photometry of field stars that have effective temperatures determined by the infrared flux method. These color calibrations have zero points that change most of the original synthetic colors by less than 0.02 mag, and the corresponding slopes generally alter the colors by less than 5%. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 83 101 Field star sample table5.dat 148 550 Calibrated color-temperature relations
See also: J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996) J/AJ/119/1424 : Color-temperature relations of M giants (Houdashelt+, 2000) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- HR HR number of star 6- 11 I6 --- HD HD number of star 13- 25 A13 --- ID Other identification of star 27- 39 A13 --- SpType MK Spectral type of star from SIMBAD 41- 44 I4 K Teff Effective temperature (1) 46- 49 F4.2 [cm/s2] log(g) Log of the surface gravity (1) 51 A1 --- f_log(g) [fhi] Estimated value of log(g) (2) 54- 58 F5.2 [Sun] [Fe/H] Log of the iron to hydrogen abundance relative to solar (1) 60 A1 --- f_[Fe/H] [e] Indicates solar metallicity has been assumed 63 I1 --- r_UBV ? The UBV reference code (3) 65 I1 --- r_VRI ? The VRI reference code (3) 69 I1 --- r_VJHK ? The VJHK reference code (3) 71 A1 --- f_VJHK [g] No H band photometry was given 74- 83 A10 --- Notes Further notes on the star (4)
Note (1): Stellar parameters were taken from Bell & Gustafsson (1978A&AS...34..229B) or Saxner & Hammarback (1985A&A...151..372S), unless otherwise noted Note (2): the flag has the following meaning: f = Isochrones were used to estimate log(g) from the effective temperature, luminosity class, and metallicity. h = This log g was taken from Bonnell & Bell (1993MNRAS.264..319B), (1993MNRAS.264..334B) i = This log(g) was estimated from stars of similar effective temperature and luminosity class Note (3): the reference is coded as follows: 1 = Mermilliod 1991, Cat. II/168 2 = Glass (1974MNSSA..33...53G) 3 = Cousins (1980SAAOC...1..234C) 4 = Johnson et al. (1966CoLPL...4...99J) 5 = Johnson et al. (1968ApJ...152..465J) 6 = Lee (1970ApJ...162..217L) 7 = Engels et al. (1981A&AS...45....5E) Note (4): Keys are as follows: D = Double/multiple system SB = spectroscopic binary V = variable (as indicated by SIMBAD and/or Mermilliod 1991
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 I4 K Teff Effective temperature 8- 11 F4.2 [cm/s2] log(g) Log of the surface gravity 15- 19 F5.2 [Sun] [Fe/H] Log of the iron to hydrogen abundance relative to solar 22- 26 F5.3 mag (U-B) ? The Johnson-Cousins U-B color (Bessel 1990PASP..102.1181B) 30- 34 F5.3 mag (U-B)CD ? The U-B color from cool-dwarf color calibrations (see section 3.2.2) 38- 42 F5.3 mag (B-V) ? The Johnson-Cousins B-V color (Bessel 1990PASP..102.1181B) 46- 50 F5.3 mag (B-V)CD ? The B-V color from cool-dwarf color calibrations (see section 3.2.2) 54- 58 F5.3 mag (V-R) ? The Johnson-Cousins V-R color (Bessel 1990PASP..102.1181B) 62- 66 F5.3 mag (V-R)CD ? The V-R color from cool-dwarf color calibrations (see section 3.2.2) 70- 74 F5.3 mag (V-I) ? The Johnson-Cousins V-I color (Bessel 1990PASP..102.1181B) 78- 82 F5.3 mag (V-I)CD ? The V-I color from cool-dwarf color calibrations (see section 3.2.2) 86- 90 F5.3 mag (V-K) ? The Johnson-Glass V-K color (Bessel & Brett 1988PASP..100.1134B) 94- 98 F5.3 mag (J-K) ? The Johnson-Glass J-K color (Bessel & Brett 1988PASP..100.1134B) 102-106 F5.3 mag (H-K) ? The Johnson-Glass H-K color (Bessel & Brett 1988PASP..100.1134B) 110-114 F5.3 mag (V-K)c ? The CIT-CTIO V-K color 118-122 F5.3 mag (J-K)c ? The CIT-CTIO V-K color 126-130 F5.3 mag (H-K)c ? The CIT-CTIO V-K color 133-138 F6.3 mag CO ? The CIT-CTIO CO filter magnitude without color correction (Frogel+ 1978ApJ...220...75F) 142-146 F5.3 mag BC(K) ? K band bolometric correction (1)
Note (1): BC(V) = BC - (V-K)
History: From AJ electronic edition References: Bell, R. A., Eriksson, K., Gustafsson, B., & Nordlund, A. 1976, A&AS, 23, 37 (1976A&AS...23...37B) Bell, R. A., & Gustafsson, B. 1978, A&AS, 34, 229 (1978A&AS...34..229B) Gustafsson, B. Bell, R. A., Eriksson, K. Nordlund, A. 1975, A&A, 42 407 (1975A&A....42..407G) Gustafsson, B. & Bell, R. A. 1979, A&A, 74, 313 (1979A&A....74..313G) Mermilliod, J.-C. 1991, Homogeneous Means in the UBV System, in Astronomical Data Center CD-ROM Selected Astronomica, Vol. 1, comp. L. E. Brotzman & S. E. Gessner (3d ed.; Greenbelt, MD: GSFC)
(End) Greg Schwarz [AAS] 17-Apr-2000
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