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J/AJ/137/3245       STARMIND MK standard's database          (Manteiga+, 2009)

Starmind: a fuzzy logic knowledge-based system for the automated classification of stars in the MK system. Manteiga M., Carricajo I., Rodriguez A., Dafonte C., Arcay B. <Astron. J., 137, 3245-3253 (2009)> =2009AJ....137.3245M
ADC_Keywords: Stars, nearby ; Spectral types ; Effective temperatures ; Abundances Keywords: astronomical data bases: miscellaneous - methods: data analysis - stars: fundamental parameters Abstract: Astrophysics is evolving toward a more rational use of costly observational data by intelligently exploiting the large terrestrial and spatial astronomical databases. In this paper, we present a study showing the suitability of an expert system to perform the classification of stellar spectra in the Morgan and Keenan (MK) system. Using the formalism of artificial intelligence for the development of such a system, we propose a rules' base that contains classification criteria and confidence grades, all integrated in an inference engine that emulates human reasoning by means of a hierarchical decision rules tree that also considers the uncertainty factors associated with rules. Our main objective is to illustrate the formulation and development of such a system for an astrophysical classification problem. An extensive spectral database of MK standard spectra has been collected and used as a reference to determine the spectral indexes that are suitable for classification in the MK system. It is shown that by considering 30 spectral indexes and associating them with uncertainty factors, we can find an accurate diagnose in MK types of a particular spectrum. The system was evaluated against the NOAO-INDO-US spectral catalog. Description: The 361 spectra are made of 279 items originated from public "online" databases and 82 items from "ad hoc" astronomical observations performed during several campaigns with the 2.5m Nordic Optical Telescope (NOT) at the El Roque de los Muchachos Astronomical Observatory. The spectral coverage and pixel dispersion were standardized from 387nm to 624nm with a resolution of 0.26nm/pix. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 45 361 STARMIND MK standard's database
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 14 A4 --- SpType MK spectral type 16- 29 A14 --- r_SpType Reference for SpType (1) 31- 34 I4 K Teff ? Effective temperature 36- 39 F4.2 [cm/s2] log(g) ? Log of surface gravity 41- 45 F5.2 [Sun] [Fe/H] ? Metallicity
Note (1): References for the MK classification of stars as follows: MK = Morgan & Keenan (1973ARA&A..11...29M) Gray-a = Gray & Garrison (1987ApJS...65..581G) Gray-b = Gray & Garrison (1989ApJS...69..301G) Gray-c = Gray & Garrison (1989ApJS...70..623G) Perkins = Keenan & McNeil (1989ApJS...71..245K, Cat. III/150) Garcia = Garcia (1989BICDS..36...27G)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Aug-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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