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III/155        HDE: Types, Positions 10639 Stars (Roeser+ 1991)

The Second Henry Draper Extension: Spectral Types and Precise Positions for 10639 Stars Roeser S., Bastian U., Wiese K. <Astron. Astrophys. Suppl. Ser. 88, 277 (1991)> =1991A&AS...88..277R The Second Henry Draper Extension Cannon A.J., Walton Mayall M. <Harv. Ann., 112 (1949)> =1949AnHar.112....1C
ADC_Keywords: Positional data ; Spectral types ; Surveys Description: The second Henry Draper Extension, giving spectral classification for about 87000 stars, up to now was published in the form of finding charts only. This catalog contains a first portion (about 10000 stars) of it in the form of a star catalogue, giving spectral types, photographic magnitudes, precise positions (J2000) and, in many cases, also proper motions of the stars HDE 332335 to HDE 342973. Positions are derived from identifications of the HDE stars in the Astrographic Catalogue. The mean error is about 0.3 arcsec. Magnitudes of the stars are taken from the Astrographic Catalogue, for which we estimate an accuracy of about 0.3 mag. To find proper motions the stars were also identified with the PPM catalogue, whenever possible. Proper motions in PPM typically have rms errors smaller than 0.5 arcsec/century. Proper motions are given for about 2500 stars. A detailed description of this catalog was done by Roser et al. (1991). NOTE: This catalogue is superseded by the complete HDE charts by Nesterov V.V. et al. (1995A&AS..110..367N), available as catalog III/182 "The HDE Charts: accurate positions, proper motions, magnitudes and spectral types of 86933 stars" File Summary: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file data.dat 80 10770 Catalog Data notes.dat 80 99 Notes
See also: III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995) I/146 : Positions and Proper Motions - North (Roeser+, 1988) I/193 : Positions and Proper Motions - South (Bastian+ 1993) Byte-by-byte Description of file: data.dat
Bytes Format Units Label Explanations
3- 9 A7 --- HDE HDE number 11 A1 --- Remark [R] a 'R' points to a remark in notes.dat 13- 16 F4.1 mag Pmag ? Photographic magnitude (copied from AC) 19- 20 A2 --- Sp Spectral type 23- 24 I2 h RAh Right ascension (Equinox J2000.0) 26- 27 I2 min RAm RA in minutes 29- 34 F6.3 s RAs RA in seconds 36 A1 --- DE- Sign of Declination (Equinox J2000.0) 37- 38 I2 deg DEd DEC in degrees 40- 41 I2 arcmin DEm DEC in arcminutes 43- 47 F5.2 arcsec DEs DEC in arcseconds 49- 55 F7.2 yr Epoch Epoch for the position 59- 65 F7.4 s/a pmRA ? Proper motion in r.a. (if a PPM star) 67- 72 F6.3 arcsec/a pmDE ? Proper motion in decl. (if a PPM star) 75- 80 I6 --- PPM ? PPM number (if a PPM star)
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 7 A7 --- HDE HDE number 8- 11 A4 --- m_HDE Multiplicity 13 I1 --- Cont ? Continuation number when several lines 14- 80 A67 --- Text Remarks to individual stars
Remarks and Modifications: The Henry Draper Catalogue provides spectral types and rough positions for about 225 000 stars all over the sky. The Henry Draper Extension (HDE) provides the same type of data for about 47 000 additional stars. Compared to these two, the second Henry Draper Extension, containing another 87 000 stars classified by Miss Cannon, is little known. This is because it has never been published as a star catalogue, but only in the form of hand-marked finding charts. The 275 charts, named HDE Charts by A. Cannon (1937), were published in the Annie J. Cannon Memorial Volume of The Henry Draper Extension (Cannon & Mayall 1949). This kind of publication was formerly sufficient for the retrieval of a star with a telescope. Nowadays, when telescopes are computer controlled, it is necessary to have precise coordinates of the stars one wishes to observe. One also needs good coordinates for identifying stars in other catalogues. Last, but not least, star charts cannot be brought into computer readable form by just key-punching a printed table. Some work on the HDE Charts was done by Nancy G. Roman of the Astronomical Data Center at NASA Goddard Space Flight Center, who key-punched HDE numbers and accompanying spectral types. At l'Observatoire de Strasbourg, Bonnet measured x,y coordinates on the charts for those stars not contained in the Durchmusterungen. However, her work remained incomplete and has never been appropriately published. Part of it is contained in the SIMBAD data base of the CDS, Strasbourg. In order to make the 87 000 additional HDE stars conveniently available, we decided to transform the finding charts into a star catalogue. As a first step, we have measured, reduced, and cross-identified approximately 10 000 stars. The catalogue of 10 639 HDE stars is available on magnetic tape from the astronomical data centers CDS (Strasbourg, France) and NSSDC (Greenbelt, Maryland). The positions given in the catalogue refer to the equinox J2000.0 and to the epoch given in the catalogue. Table 1 shows a sample of a few lines from the catalogue file, together with a short explanation. A remarks file is attached to the catalogue with entries for all stars showing peculiarities such as unclear identity, non-appearance in AC, variability, etc. Information on variability was taken from Kholopov et al. 1990. Only one of the 10 639 measured stars could not be identified in AC (it is a Mira variable!). Five stars could successfully be identified, although no stellar image is visible on the printed HDE Charts (only the markers pointing to them). For 129 stars, no unique identification was possible. In most of these cases the star image on the HDE Chart comprises two or three actual stars of roughly equal brightness. The HDE spectral types will then be composites of the corresponding stellar spectra (this can be inferred from a sample HD objective-prism plate shown by Cannon & Pickering 1921). Our catalogue gives positions and magnitudes for all the candidate stars, with suffixes A, B, C added to the HDE number. A small number of stars could not be uniquely identified because the hand-drawn markers on the charts were ambiguous. They are indicated in the remarks file, and again suffixes A, B are added to the HDE number. Two HDE numbers (340 719 and 340 720) refer to the same optical star: it is a spectroscopic double star to which Miss Cannon correctly assigned two spectral types, and thus two numbers. Table 1: The Second Henry Draper Extension. Sample lines of the catalogue on magnetic tape.
This table gives a small sample of the catalogue file. Column 1 contains the HDE number. An 'R' in Col. 2 points to a remark in the separate remarks file. Col. 3 contains the photographic magnitude from AC, col. 4 the spectral type, cols. 5 and 6 the right ascension and declination (for equinox J2000.0 and epoch given in col. 7). Columns 8 to 10 contain data for the PPM stars only: Cols. 8 and 9 give the proper motions in r.a. and dec. (in units of s/yr and "/yr, respectively) and col. 10 the PPM number. HDE mag Sp. R.A. Dec. Epoch p.m. p.m. PPM No. J2000.0 R.A. Dec. No. Rem. h m s o ' " s/yr "/yr 335744 10.3 G5 18 12 40.92 +27 27 24.2 1897.63 335745 9.3 K0 18 11 44.938 +27 23 14.79 2000.00 -0.0003 0.007 106895 335746 11.5 G5 18 11 41.52 +27 14 57.5 1897.63 335747 11.5 K7 18 11 52.48 +27 9 43.7 1897.63 335748 10.8 F0 18 13 20.63 +27 3 8.0 1897.63 335749 11.2 K0 18 13 26.94 +26 59 6.4 1897.63 335750 11.5 G0 18 13 17.05 +26 51 53.7 1897.63 335751 11.5 F0 18 13 7.79 +26 49 36.0 1897.63 335752 11.6 F8 18 13 29.14 +26 47 6.0 1897.63 335753 11.5 F5 18 12 24.70 +26 48 39.2 1897.63 335754A 11.7 G0 18 12 1.71 +26 40 42.6 1897.63 335754B 12.2 G0 18 12 1.41 +26 40 40.7 1897.63 335755A R 11.7 A2 18 12 8.96 +26 34 9.5 1897.63 335755B R 12.5 A2 18 12 6.19 +26 34 1.2 1897.63 335756 11.5 G0 18 12 44.78 +26 37 37.5 1897.63 335757 11.5 F2 18 13 33.32 +26 39 23.4 1897.63 335758 10.8 K5 18 13 49.346 +26 36 44.06 2000.00 0.0005 0.017 106943 335759 11.8 F8 18 14 32.29 +26 42 22.2 1897.63 335760 11.5 G0 18 14 4.07 +26 15 19.4 1897.63 335761 10.1 F8 18 13 31.450 +26 17 6.06 2000.00 -0.0013 -0.016 106939 335762 10.0 A2 18 13 24.839 +26 16 46.76 2000.00 0.0006 -0.015 106931 335763 11.3 F2 18 13 2.04 +26 10 32.7 1897.63 335764 11.6 G5 18 11 58.57 +26 10 18.6 1897.63 335765 11.1 G0 18 12 19.54 +26 0 39.8 1897.63 335766 11.5 G5 18 14 49.34 +26 6 28.6 1897.63 References: Cannon, A.J. 1937, Annals Astron. Obs. Harvard Coll., 105, 1 Cannon, A.J., Mayall, M.W. 1949, The Annie J. Cannon Memorial Volume of the Henry Draper Extension, Annals Astron. Obs. Harvard Coll., 112 Cannon, A.J., Pickering, E.C. 1921, Annals Astron. Obs. Harvard Coll., 96 Kholopov, P.N., et al. 1990,. General Catalogue of Variable Stars, fourth edition, Vol. 4. "Nauka", Moscow, Catalog II/139 Roeser, S., Bastian, U. 1989, PPM - positions and proper motions of 181731 stars north of -2.5 degrees declination, Astronomisches Rechen-Institut, Heidelberg Catalog I/146 (1988A&AS...74..449R) Roeser, S., Bastian, U., and Wiese, K. 1991, A&AS, 88, 277
(End) C.-H. Joseph Lyu [Hughes STX/NASA] 16-Aug-1995
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