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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 361 STARMIND MK standard's database
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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Note (1): References for the MK classification of stars as follows:
MK = Morgan & Keenan (1973ARA&A..11...29M 1973ARA&A..11...29M)
Gray-a = Gray & Garrison (1987ApJS...65..581G 1987ApJS...65..581G)
Gray-b = Gray & Garrison (1989ApJS...69..301G 1989ApJS...69..301G)
Gray-c = Gray & Garrison (1989ApJS...70..623G 1989ApJS...70..623G)
Perkins = Keenan & McNeil (1989ApJS...71..245K 1989ApJS...71..245K, Cat. III/150)
Garcia = Garcia (1989BICDS..36...27G 1989BICDS..36...27G)
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Aug-2011