III/75B MK Classification for HD stars for 25-30{deg} zone (Jensen 1982) ================================================================================ MK Classification for HD stars in the 25-30 declination zone Jensen K.S. ================================================================================ ADC_Keywords: MK spectral classification Description: The catalog contains MK spectral classifications for 1003 HD stars in the zone +25-30{deg}, 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) File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file main.dat 71 1003 The catalogue of MK classifications remarks.dat 80 709 Remarks -------------------------------------------------------------------------------- Byte-per-byte Description of file: main.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Byte-per-byte Description of file: remarks.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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