III/106 MK Classification of Visual Multiples (Abt, 1981)
Visual Multiples. VII. MK Classifications
Abt H.A.
<Astrophys. J. Suppl. Ser. 45, 437 (1981)>
=1981ApJS...45..437A 1981ApJS...45..437A
ADC_Keywords: Stars, double and multiple ; MK spectral classification
Keywords: stars: spectral classification - stars: stellar statistics -
stars: visual multiples
Description:
The spectral types listed here represent about one-third of a
program of MK classification of all the Northern (Dec>-30deg)
visual components brighter than B∼8.0mag.
The spectra used were obtained in 1969-1980 with the Cassegrain
spectrograph attached to the Kitt Peak No.2 91-cm telescope. The
grating spectra have a dispersion of 128Å/mm, and are 1.2mm wide;
they are overexposed and underdeveloped to minimize grain. The spectra
were classified against standards of the "Revised MK Spectral Atlas
for stars earlier than the Sun" by Morgan, Abt and Tapscott (Yerkes
Obs. 1978) and of the "Spectral classification" of Morgan and Keenan
(1973ARA&A..11...29M 1973ARA&A..11...29M).
Accurate positions, V magnitudes rounded to 0.1 mag, and remarks were
added by B. Skiff in June 2004 as the file "more.dat"; some typos in
the catalog were also corrected (see the "History" section below).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 121 867 *MK Classification and notes
more.dat 85 867 Positions and additional notes by B. Skiff
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Note on catalog.dat: mostly Table 1 of paper, with the following modifications:
- the HR number is not included here
- the spectral types of the Am stars s coded somewhat differently:
the three types from K, Balmer and metallic lines are coded in a
more compressed form commonly used by Garrison, Gray, et al.im e.g.:
Am(K/H/M=A9/F0V/F2) is written here as Am(kA9hF0VmF2)
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Mcat Multiple star catalog name (ADS, Fin, Kui, B)
4- 8 I5 --- ID Number in Mcat catalog
10- 11 A2 --- m_ID Component designation (1)
15- 26 A12 --- Name Name of the star (mainly HD)
29- 48 A20 --- Sp MK Spectral classification
51-121 A71 --- Note Names and selected published types (2)
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Note (1): In a few cases the components have been updated by B. Skiff:
in a few cases Abt indicates that two components were involved, but
the modern data show that the fainter component is much fainter than
older double-star catalogues suggest, and the type must apply to just
the brighter one. There are likewise a few cases in the opposite sense
(close pairs of similar brightness that must have been observed
together but which Abt shows as only the 'A' component). The component
tags were adjusted in both circumstances.
Note (2): a few errors in the references were detected and corrected
by B. Skiff in June 2004:
- the reference to Morgan, Code, & Whitford was given both
as 1953 and 1955; 1955 is the correct year.
- the reference to Slettebak 1954b is in fact Slettebak 1954a
- Heard 1952 should be Heard 1956.
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Byte-by-byte Description of file: more.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Name of the star, as in "catalog.dat"
14- 15 I2 h RAh Right Ascension J2000 (hours)
17- 18 I2 min RAm Right Ascension J2000 (minutes)
20- 24 F5.2 s RAs Right Ascension J2000 (seconds)
26 A1 --- DE- Declination J2000 (sign)
27- 28 I2 deg DEd Declination J2000 (degrees)
30- 31 I2 arcmin DEm Declination J2000 (minutes)
33- 36 F4.1 arcsec DEs Declination J2000 (seconds)
38 A1 --- rPos [TUM-] Source of position (1)
41- 43 F3.1 mag Vmag Rounded visual magnitude
46- 85 A40 --- Remark Additional remarks by B. Skiff. (2)
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Note (1): the origin of the position is:
M = 2MASS (Cat. II/246)
T = Tycho-2 (2000A&A...357..367H 2000A&A...357..367H, Cat. I/259), can also include
Hipparcos (I/239/hip_main) or TDSC (I/276)
U = UCAC2 (2004AJ....127.3043Z 2004AJ....127.3043Z, I/289)
Note (2): the remarks concern mainly the description of the pairs or
specific components. The term "close pair" indicates binaries
that spend most of their time with separation < 0".5.
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History:
The catalog was originally keypunched at CDS in 1985.
* 15-Jun-2004: positions were added by B. Skiff (Lowell Obs.);
the following typos were found in the catalog and corrected:
ADS 7263 = HD 79709 (not HD 79706)
ADS 7885 = HD 92614 (not HD 92559)
ADS 8494: the brighter star = HD 106799, due to the magnitudes in the
HD catalogue being reversed in error
ADS 9102 = HD 123048 (not HD 123049)
ADS 9538 = HD 135051 (not HD 135351)
ADS 9716C= HD 139323 (omitted)
ADS 14693 = HD 201599 (not HD 201549)
ADS 14744 = BD+48 3305 (omitted)
ADS 14819 = BD+66 1380 (omitted)
ADS 16531 = BD+29 4868 (omitted)
(End) Francois Ochsenbein [CDS] 15-Jun-2004