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J/AZh/73/906     Energy distribution of main-sequence B stars  (Knyazeva+, 1996)

On the normal energy distribution in stellar spectra: main-sequence B stars. Knyazeva L.N., Kharitonov A.V. <Astron. Zh. 73, 906 (1996)> =1996AZh....73..906K =1996ARep...40..823K
ADC_Keywords: Stars, OB ; Energy distributions Description: The normal spectral energy distribution in the spectra of main-sequence B stars of five subclasses is presented. Spectral classification and UBV photometry from the fourth edition of the BSC and spectrophotometry from three extensive spectrophotometric catalogs are used. The method of selecting unreddened stars is outlined. The good agreement between the mean color indices in the UBV system calculated for a sample of stars with spectrophotometry and for considerably larger samples of unreddened stars of the corresponding subclasses from the BSC confirms the reliability of the results obtained. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 39 88 Normal energy distributions
See also: III/186 : Energy distribution in stars at 320-760 nm (Knyazeva+, 1996) V/50 : Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) J/AZh/73/67 : Energy distribution of G,K and M stars (Knyazeva+, 1996) J/AZh/75/70 : Energy distribution of O9-B5 stars (Knyazeva+, 1998) J/AZh/75/197 : Energy distribution of O5-O8 stars (Knyazeva+, 1998) Table 1: Normal color indices for MS B5-B9.5 stars as described by different authors and restrictions adopted for unreddened stars -------------------------------------------------------------------------------- Authors and references -------------------------------------------------------------------------------- [8] [9] [10] [11] [12] [13] [14] Boundary SpCl values ---------------------------------------------------------------- color indices -------------------------------------------------------------------------------- B5V B-V -0.16 -0.21 -0.18 -O.15 -0.16 -0.17 -0.12 U-B -0.56 -0.59 -0.58 -0.57 -0.51 B6V B-V -0.17 -0.16 -0.12 -0.14 -0.15 U-B -0.51 -0.49 -0.50 B7V B-V -0.13 -0.15 -0.14 -0.10 -0.13 -0.13 -0.09 U-B -0.47 -0.44 -0.43 -0.43 -0.36 B8V B-V -0.09 -0.12 -0.12 -0.07 -0.05 -0.11 -0.10 -0.07 U-B -0.29 -0.36 -0.31 -0.36 -0.33 -0.25 B9V B-V -0.05 -0.08 -0.08 -0.04 -0.04 -0.07 -0.07 -0.06 U-B -0.16 -0.21 -0.19 -0.18 -0.19 -0.12 B9.5V B-V -0.03 -0.05 -0.06 -0.02 -0.04 -0.04 -0.04 0.00 U-B -0.08 -0.12 -0.14 -0.10 -0.10 -0.06 -------------------------------------------------------------------------------- References: [8] Johnson & Morgan, 1953ApJ...117..313J [9] Sharov, 1963AZh....40..900S [10] Serkowski, 1963ApJ...138.1035S [11] Gottlieb, 1969ApJ...157..611G [12] Cowley et al., 1970AJ.....75..941C [13] Fitzgerald, 1970A&A.....4..234F [14] Straizhis, 1977, Mnogotsvetnaya fotometriya zvezd (Multicolor stellar photometry), Vilnius: Mokslas Publishers. Table 2: Properties of the sample of stars -------------------------------------------------------------- B-V U-B SP n max min mean max min mean -------------------------------------------------------------- Complete sample of stars B5V 35 -0.12 -0.17 -0.140 -0.51 -0 65 -0.559 B7V 21 -0.09 -0.14 -0.111 -0.36 -0.50 -0.439 B8V 40 -0.07 -0.15 -0.097 -0.25 -0.51 -0.368 B9V 44 -0.06 -0.12 -0.079 -0.12 -0.45 -0.263 B9.5V 43 -0.00 -0.08 -0.043 -0.06 -0.24 -0.133 Sample of stars with spectrophotometry B5V 9 -0.13 -0.15 -0.141 -0.51 -0.58 -0.556 B7V 5 -0.09 -0.14 -0.108 -0.36 -0.48 -0.428 B8V 8 -0.08 -0.15 -0.105 -0.25 -0.45 -0.361 B9V 9 -0.07 -0.10 -0.081 -0.19 -0.38 -0.276 B9.5V 13 0.00 -0.08 -0.042 -0.07 -0.17 -0.119 Table 3: List of stars (BS number) used to derive the normal energy distribution --------------------------------------------------------------- B5V B7V B8V B9V B9.5V B9.5V --------------------------------------------------------------- 154 A 847 A 123 A,M 26 A 132 A 6779 A 1244 A 910 A 1088 P 1038 A,M 342 A 7773 P 1289 A 1399 A 1202 M 1070 M 522 A 8546 A 1839A,M 2223 M 1696 A 1705 A 708 A 8988 A 2198 M 3982 A,P 5685 A,M,P 1997 A 1621 P 3849 A,M 6079 A,M 5718 A 3268 A 7608 A,M 6281 A,M 7236 A,P 4386 A 8001 A,M,P 8634 A,M 7880 A 4468 A 8858 A 9048 A 4757 A Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 I4 0.1nm Lambda Wavelength 7- 11 F5.3 --- B5V Spectral energy for B5V stars normalized to 1.0 at 5475Å 14- 18 F5.3 --- B7V Spectral energy for B7V stars normalized to 1.0 at 5475Å 21- 25 F5.3 --- B8V Spectral energy for B8V stars normalized to 1.0 at 5475Å 28- 32 F5.3 --- B9V Spectral energy for B9V stars normalized to 1.0 at 5475Å 35- 39 F5.3 --- B9.5V Spectral energy for B9.5V stars normalized to 1.0 at 5475Å

(End) Veta Avedisova [INASAN] 12-Apr-2001
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