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J/A+A/325/693       Quantitative spectral classification (Malyuto+ 1997)

Quantitative spectral classification based on photoelectric spectrum scanner measurements of F-K stars Malyuto V., Schmidt-Kaler T. <Astron. Astrophys. 325, 693 (1997)> =1997A&A...325..693M
ADC_Keywords: MK spectral classification ; Spectrophotometry Keywords: stars: fundamental parameters, classification Description: New criteria of quantitative spectral classification have been introduced and the method of stepwise linear regression to these criteria for quantitative spectral classification of F-K stars has been applied to the Bochum photoelectric spectra (resolution 10A). Table 4 contains the averaged values of the classification criteria (indices) for 54 stars used in our analysis. Each measurement in our analysis refers to an area confined by the border wavelengths for an interval, the spectral energy distribution and the zero level. We chose the intervals for measurements in a such way that the sensitivity to spectral and/or luminosity effects were different for two adjacent or near-by intervals. The ratios of measurements in such intervals may then serve as classification criteria (indices) with minimum contamination by interstellar extinction. Table 2 contains the border wavelengths for the intervals with indications of the principal measured features. Table 3 contains the list of classification indices. Table 2. The border wavelengths for the intervals in Angstroems. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4 45 54 Measurements of the indices 1-6
Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number 7- 12 F6.3 --- I1 ?=9.999 Index 1 in relative intensity (1) 13- 18 F6.3 --- I2 ?=9.999 Index 2 in relative intensity (1) 19- 24 F6.3 --- I3 ?=9.999 Index 3 in relative intensity (1) 25- 30 F6.3 --- I4 ?=9.999 Index 4 in relative intensity (1) 31- 36 F6.3 --- I5 ?=9.999 Index 5 in relative intensity (1) 37- 42 F6.3 --- I6 ?=9.999 Index 6 in relative intensity (1)
Note (1): See table2 and table3 for the definitions of the indices.
Table 2: The border wavelengths for the intervals in Angstroems ------------------------------------------------------------------------------- Interval Left Right Dλ Prominent features (λ in A) No. side side ------------------------------------------------------------------------------- 1 3660 3700 40 3680, FeI; 3685, TiII; 3687, FeI 2 3700 3780 80 3720, 3735, 3749, FeI; 3750, 3771, HI 3 4120 4215 95 4132, FeI; 4176-200, FeI,CN; 4215, CN 4 4215 4280 65 4227, CaI; 4253, CrI, FeI; 4272, FeI 5 4280 4320 40 4290, CrI; 4299, CH, FeI; 4308, CH, FeI 6 4320 4360 40 4340, HI 7 4515 4575 60 4528, FeI; 4549, FeII, TiII 8 4575 4635 60 4582, CaI, FeI; 4602-3, CrI, FeI 9 5125 5245 120 5134-52, FeI; 5172, MgI; 5210, CrI; 5227-33, FeI 10 5245 5290 45 5270, FeI, CaI Table 3: The classification indices (ratios of measurements in the intervals) ------------------------------------------------------------------------------- Indice Interval No. Wavelengths for Difference of Criterion (%) No. (from Table 2) intervals in A mean wavelengths r.m.s.error ------------------------------------------------------------------------------- 1 1/2 (3660-3700)/(3700-3780) 60 3.4±1.2 2 3/4 (4120-4215)/(4215-4280) 80 1.8±0.6 3 4/6 (4215-4280)/(4320-4360) 92 1.0±0.4 4 5/6 (4280-4320)/(4320-4360) 40 2.0±0.7 5 7/8 (4515-4575)/(4575-4635) 90 0.7±0.2 6 9/10 (5125-5245)/(5245-5290) 83 0.7±0.3 Acknowledgements: Valeri Maljuto
(End) Patricia Bauer [CDS] 18-Dec-1996
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