==========================================================================
III/75B MK Classification for HD stars for 25-30deg zone (Jensen 1982)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
main.dat remarks.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=III/75B
==========================================================================
drwxr-xr-x 259 cats archive 8192 Dec 5 19:00 [Up]
drwxr-xr-x 2 cats archive 4096 Jan 13 2023 [TAR file]
-rw-r--r-- 1 cats archive 475 Dec 19 2022 .message
-r--r--r-- 1 cats archive 7131 Jan 5 2005 ReadMe
-rw-r--r-- 1 cats archive 527 Sep 19 2007 +footg5.gif
-rw-r--r-- 1 cats archive 4348 Mar 5 2008 +footg8.gif
-r--r--r-- 1 cats archive 72216 Dec 27 2004 main.dat [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 41123 Apr 9 1993 main.ori
-r--r--r-- 1 cats archive 23669 Jan 5 2005 remarks.dat [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 20555 Aug 3 1993 remarks.ori Beginning of ReadMe :III/75B MK Classification for HD stars for 25-30deg 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 +25-30deg, briefly presented at IAU Colloq. 47, held in
Vatican City in July 1978 (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), 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:
sigma(SpT) = 0.65 (unit 1 subtype)
sigma(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) and Guetter (1968PASP...80..197G)
concern early-B stars;
- Cowley et al. (1969AJ.....74..375C) and Osawa (1959ApJ...130..159O)
concern late-B and A stars;
- Harlan et al. (1969AJ.....74..916H, 1970AJ.....75..165H),
Hill et al. (1976MmRAS..82...69H) and Heard (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....85...93M), Cowley et al.
(1969AJ.....74..375C), Cowley (1976PASP...88...95C), or
Abt (1981ApJS...45..437A)