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 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/AJ/121/2159 : Basic parameters for 372 A, F & G stars (Gray+, 2001)
http://nedwww.ipac.caltech.edu/level5/Gray/frames.html :
A digital spectral classification atlas (R. O. Gray)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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)
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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 1975AJ.....80..955C,
1979AJ.....84.1858C 1979AJ.....84.1858C) for the A- and F-type dwarfs and giants, and of
Gray (1991A&A...252..237G 1991A&A...252..237G, 1992A&A...265..704G 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 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 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)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name HD or BD number
13- 80 A68 --- Note Text of the note
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 19-Jun-2001