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J/AJ/121/2148       Precise spectral types for 372 A, F & G stars  (Gray+, 2001)

The physical basis of luminosity classification in the late A-, F-, and early G-type stars. I. Precise spectral types for 372 stars. Gray R.O., Napier M.G., Winkler L.I. <Astron. J. 121, 2148 (2001)> =2001AJ....121.2148G
ADC_Keywords: Stars, late-type ; MK spectral classification ; Stars, A-type ; Stars, F-type ; Stars, G-type ; Keywords: stars: fundamental parameters - stars: late-type Abstract: This is the first in a series of two papers that address the problem of the physical nature of luminosity classification in the late A-, F-, and early G-type stars. In this paper, we present precise spectral classifications of 372 stars on the MK system. For those stars in the set with Stroemgren uvbyβ photometry, we derive reddenings and present a calibration of MK temperature types in terms of the intrinsic Stroemgren (b-y)0 index. We also examine the relationship between the luminosity class and the Stroemgren c1 index, which measures the Balmer jump. The second paper will address the derivation of the physical parameters of these stars, and the relationships between these physical parameters and the luminosity class. Stars classified in this paper include one new λ Bootis star and 10 of the F- and G-type dwarfs with recently discovered planets. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 372 MK classifications of late A-, F-, and early G-Type stars notes.dat 80 109 Individual notes
See also: J/AJ/121/2159 : Basic parameters for 372 A, F & G stars (Gray+, 2001) : A digital spectral classification atlas (R. O. Gray) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name The HD (Cat. III/135) or other name (1) 13- 16 I4 --- HR ? The HR (Cat. V/50) number 18- 31 A14 --- Star Star name 33 A1 --- Std [*] Indicates an MK standard star 35- 39 F5.2 mag Vmag The V-band magnitude 41 A1 --- uvby [ync] Indicates the status of Stromgren uvby photometry in the literature (2) 43 A1 --- beta [ync] Indicates the status of Stromgren β photometry in the literature (2) 45- 48 F4.2 mag E(b-y) ? The E(b-y) reddening (3) 50- 76 A27 --- SpType Spectral type (4) 78- 80 A3 --- Notes Further notes (5)
Note (1): Stars in this table are ordered in terms of the HD number. Non-HD stars are placed at the end of the table. Note (2): y = present n = absent c = present but photometry includes significant light from a companion star Note (3): Determined using the methods of Crawford (1975AJ.....80..955C, 1979AJ.....84.1858C) for the A- and F-type dwarfs and giants, and of Gray (1991A&A...252..237G, 1992A&A...265..704G) for the A-, F-, and early G-type supergiants. Note (4): The notation used for the spectral types of metallic line (Am, Fm) stars is standard; separate spectral types are given for the CaII K line (k), the hydrogen lines (h), and the general metallic line spectrum (m), for example, kA7 hA8 mF2 (III), where the luminosity type is enclosed in parentheses because the spectrum shows the "anomalous luminosity effect" (Abt & Morgan, 1976ApJ...205..446A). On the other hand, spectral types for many of the metal-weak stars are given as a temperature type (usually deduced from the hydrogen lines and the morphology of the metallic line spectrum) plus luminosity type, followed by spectral types based on the strengths of the Ca II K-line and the general metallic line spectrum, for example, F4 V kF0 mF0. In section 4, an alternate notation, based on Gray (1989AJ.....98.1049G), is given for some of these metal-weak stars. Note (5): * = Comments in notes.dat file E = Star with extrasolar planet A,B = Component of double or multiple star H = Star in the Hyades P = Star in the Pleiades 2 = Star present in PaperII (cat. J/AJ/121/2159)
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name HD or BD number 13- 80 A68 --- Note Text of the note
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 19-Jun-2001
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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