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III/150 Perkins Revised MK Types for the Cooler Stars (Keenan+ 1989)
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The Perkins Catalog of Revised MK Types for the Cooler Stars
Keenan P.C., McNeil R.C.
<ApJS, 71, 245 (1989)>
=1989ApJS...71..245K
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ADC_Keywords: MK spectral classification; Spectral types;
Stars, late-type; Stars, standard
Description:
The catalog contains 1054 standard stars of spectral types G0 and later (G,
K, M, and a few S stars) classified on the Revised MK system at the Perkins
Observatory. The revised MK system is described by Keenan (1987), and the
present list is an expansion of and supersedes one published by Keenan and
Yorka (1988). The spectrograms used for the classification were taken at
four different observatories; hence, extensive comparisons have been made
to ensure consistency between the Northern and Southern Hemispheres. The
list provides a consistent set of standards in most parts of the sky and
over a considerable range in magnitude. Omitted are stars of spectral
types R and N, Mira variables, and stars of other groups (e.g., BY Dra
variables) having spectra that are composite or so peculiar that they are
not satisfactorily classified on the present system. The catalog includes
star names (including Bayer and Flamsteed designations), numbers from The
Bright Star Catalog, HD numbers, photoelectric V magnitudes, and spectral
types.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
perkins.dat 100 1061 Catalog Data
notes.dat 72 384 Notes
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Byte-by-byte Description of file: perkins.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name *The name or constellation letter of the star
17- 21 A5 --- BSC The number in the Bright Star Catalogue
(= the HR number)
23- 29 A7 --- HD The number in the Henry Draper Catalogue
32- 33 I2 h RAh ? The Right Ascension in hours
for the year 2000
35- 38 F4.1 min RAm ? Right Ascension in minutes
41 A1 --- DE- sign of the Declination for the year 2000
42- 43 I2 deg DEd ? DEC in degrees
45- 46 I2 arcmin DEm ? DEC in arcminutes
48- 52 F5.2 mag Vmag1 ? One V magnitude for simple type star
53 A1 --- flag *flag for Vmag1
54- 58 F5.2 mag Vmag2 *? Second V magnitude for the other star type
59 A1 --- n_Vmag2 *additional note for V mag
60- 99 A40 --- Sp The spectral type
100 A1 --- rem An asterisk (*) denotes that a remark will
be found in the "notes.dat" file
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Note on Name:
The name or constellation letter of the star preceded by + for standard type
stars (* in the computer database). For fainter stars the variable star
designation, or for dwarfs the number in Gliese's Catalogue (1969) is given
when available, preceded by G1. The symbol G refers to Giclas' lists of
faint proper-motion stars (Giclas, Burnham, and Thomas 1955-80).
Note on flag:
A colon (:) indicates uncertainty, a "V" known variability.
Note on Vmag2:
The V magnitude, taken whenever possible from the catalog of Nicolet.
Note on n_Vmag2:
A fainter magnitude if the star is variable, in which case the bright
magnitude is given in Vmag. A "p" indicates that the magnitude is
photographic.
Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 72 A72 --- rem Remarks
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Remarks and Modifications:
The Revised MK system has been described by Keenan (1987). For the
best-determined types, that can serve as standards, has been published by
Keenan and Yorka (1988).
The types were determined visually from the instruments listed in Table 1.
Table 1
TELESCOPES AND SPECTROGRAMS
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Observatory Telescope Spectrograph Scale
Perkins 0.8 meter Meinel 85 A/mm
Lowell 1.8 Boller & Chivens 77
Cerro Tololo 1.5 Hiltner 78
Las Campanas 0.6 Garrison 68
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In the Catalog the temperature types are generally given to a quarter of a
subclass (e.g., K0, K0+, K0.5, K1-, K1), but when not all the decimal
divisions of a class are counted as a subclass (as in type G).
The full subclasses that we use are the following: G0, G2, G5, G8, K0,
K1, K2, K3, K4, K5, M0, M1, M2, M3, M4, M5, M6, M7, M8.
REFERENCES:
Giclas, H.L., Burnham, Jr., R., Thomas, N.G. 1958-80, Lowell Obs.
Bull. No. 69-166.
Gliese, W. 1969, Heidelberg Veroff., No. 22.
Keenan, P.C. 1987, Pub. A.S.P., 99, 713.
Keenan, P.C., McNeil, R.C. 1976. An Atlas of Spectra of The Cooler
Stars: Types G, K, M, S, and C. Ohio State University Press.
Keenan, P.C., and Yorka, S.B. 1988, Bull. Inform. CDS No. 35, p. 37
Morgan, W.W., Keenan, P.C., Kellman, E. 1943. An Atlas of Stellar
Spectra. University of Chicago Press, Chicago.
Nicolet, B. 1978, Astr. Ap. Suppl., 34, 1.
Yamashita, Y., Nariai, K., Norimoto, Y. 1977. An Atlas of
Representative Stellar Spectra. University of Tokyo Press, Tokyo.
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(End) C.-H. Joseph Lyu [Hughes STX/NASA] 16-Aug-1995