III/75B MK Classification for HD stars for 25-30° zone (Jensen 1982)
MK Classification for HD stars in the 25-30 declination zone
Jensen K.S.
<Private communication to the CDS (1982)>
ADC_Keywords: MK spectral classification
Description:
The catalog contains MK spectral classifications for 1003 HD stars in
the zone +25-30°, briefly presented at IAU Colloq. 47, held in
Vatican City in July 1978 (1979RA......9..479C 1979RA......9..479C). Most stars classified
in this region are earlier than G2. The notation is the same as in the
earlier paper (1981A&AS...45..455J 1981A&AS...45..455J), with conventions similar to the
Houk and Cowley survey (Cats. III/31 and III/51); a noticeable
exception is that the luminosity class the most probable stands before
the slash. On the average, the classifications present in the
catalogue are means of 3 classifications.
The internal rms error estimated by the author on a single
classification is typically:
σ(SpT) = 0.65 (unit 1 subtype)
σ(Lum) = 0.40 (unit lum. class)
No dependence on spectrum quality is found; however the quality 4
spectra are seldom classified without slashes (which introduces a sort
of "internal scatter" into the type)
External errors were estimated by a comparison with published work:
- Walborn (1971ApJS...23..257W 1971ApJS...23..257W) and Guetter (1968PASP...80..197G 1968PASP...80..197G)
concern early-B stars;
- Cowley et al. (1969AJ.....74..375C 1969AJ.....74..375C) and Osawa (1959ApJ...130..159O 1959ApJ...130..159O)
concern late-B and A stars;
- Harlan et al. (1969AJ.....74..916H 1969AJ.....74..916H, 1970AJ.....75..165H 1970AJ.....75..165H),
Hill et al. (1976MmRAS..82...69H 1976MmRAS..82...69H) and Heard (1956PDDO....2..105H 1956PDDO....2..105H)
concern F stars;
- Fehrenbach lists concern all type stars.
The comparisons give the following external errors:
-----------------------------------------------------
Source N D(SpT) ± D(Lum) ±
-----------------------------------------------------
Walborn (1971) 5 -.40 ± .45 -.10 ± .32
Guetter (1968) 4 -.12 ± .25 -.12 ± .25
Cowley et al. 17 -.52 ± .72 -.09 ± .53
Osawa (1959) 18 -.22 ± .77 -.22 ± .77
Harlan et al. 20 +.20 ± .69 +.03 ± .56
Hill et al. 18 -.36 ± .78 -.19 ± .55
Heard (1956) 46 -.24 ± .88 +.10 ± .47
Fehrenbach et al. 46 +.48 ±1.39 +.34 ±1.06
-----------------------------------------------------
These figures should be compared with e.g. Heck and Mersch
(1980A&A....83..287H 1980A&A....83..287H, 1980A&A....85...93M 1980A&A....85...93M), Cowley et al.
(1969AJ.....74..375C 1969AJ.....74..375C), Cowley (1976PASP...88...95C 1976PASP...88...95C), or
Abt (1981ApJS...45..437A 1981ApJS...45..437A)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
main.dat 71 1003 The catalogue of MK classifications
remarks.dat 80 709 Remarks
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Byte-per-byte Description of file: main.dat
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Bytes Format Units Label Explanations
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2- 7 I6 --- HD Number in Henry Draper Catalogue
10- 24 A15 --- MK Spectral classification
25- 31 A7 --- Rem Short remarks
34 I1 --- q_MK Quality of classification
36 A1 --- R [R] indicates that further comments on the
spectrum can be found in the Remark section
38 A1 --- D [D] indicates that the star has been found
in the IDS catalogue
40 I1 --- N Number of classifications available
for the star.
42- 43 I2 h RAh Right Ascension J2000 (hours) (1)
45- 46 I2 min RAm Right Ascension J2000 (minutes) (1)
48- 52 F5.2 s RAs Right Ascension J2000 (seconds) (1)
54 A1 --- DE- Declination J2000 (sign) (1)
55- 56 I2 deg DEd Declination J2000 (degrees) (1)
58- 59 I2 arcmin DEm Declination J2000 (minutes) (1)
61- 64 F4.1 arcsec DEs Declination J2000 (seconds) (1)
66 A1 --- rPos [TUG] Origin of position (1)
68- 71 F4.1 mag Vmag Visual magnitude (1)
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Note (1): data added in 2004 by B. Skiff.
The origin of the position is
G = GSC-ACT (Cat. I/255)
T = Tycho-2 (Cat. I/259)
U = UCAC2 (Cat. I/289)
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Byte-per-byte Description of file: remarks.dat
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Bytes Format Units Label Explanations
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2- 7 I6 --- HD Number in Henry Draper Catalogue
10 A1 --- RD [RDs] Comment indicator (1)
11 A1 --- --- [:]
13- 80 A68 --- Text of comment (2)
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Note (1): The comment indicator is
R: remarks (except of cause the 'see text'-remarks!) are ALL made
solely on the basis of the spectra, sometimes after reexamination
and comparison with other plates, but never with any knowledge of
photometry, doublicity etc.
D: remarks give the ADS/IDS numbers usually followed by a parenthesis
containing magnitude difference and separation
'D' remarks are intended as a help for the user in judging the
influence of doublicity on the classifications, if specially
interested in double stars one should consult the original
catalogues since much more information can be found therein.
s: remark added by B. Skiff (2004)
Note (2): The following abbreviations are used:
overl: overlap(ped)
pl : plate
pos : possibly
prob : probably
spec : spectrum(a)
str : strong
w : weak
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History:
* 25-Jun-1982: the catalog (on punched cards) was kindly supplied
by Klaare S. Jensen to CDS, with short explalations and a freedom
to diffuse the classifications and the associated remarks.
* 19-Aug-1993: remarks added (typed from the manuscript).
* 19-Dec-2004: Positions and additional notes completed by Brian Skiff.
(End) M.J. Wagner, F. Ochsenbein [CDS] 09-Aug-1993