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VII/231      Catalog of bright diffuse Galactic nebulae     (Cederblad, 1946)

Studies of bright diffuse galactic nebulae with special regard to their spatial distribution Cederblad S. <Lund Medd. Astron. Obs. Ser. II, 119, 1 (1946)> =1946MeLu2.119....1C
ADC_Keywords: Nebulae ; Diffuse clouds ; Magnitudes Description: The Catalog of bright diffuse Galactic nebulae was compiled in the frame of a thesis investigating the spatial distribution and the geometrical properties of bright diffuse Galactic nebulae, together with some inquiries into the interstellar absorption problem. It is a mostly complete compilation of the knowledge about bright galactic nebulae around 1945. Global parameters derived for each nebula include a classification, the apparent dimensions, and distance estimations; the Catalog includes also extensive notes, and its bibliography covers the period 1877 to 1941. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 148 330 Catalog of bright diffuse Galactic nebulae notes.dat 80 889 Bibliographical notes and remarks to the catalog refs.dat 80 1507 *Bibliography of books and papers relating to bright diffuse galactic nebulae, 1877-1941
Note on refs.dat: As far as possible the author has consulted the books and papers listed in the Bibliography. When direct checks have not been possible it has been deemed necessary to ensure completion by means of available second hand sources. In some few cases an exact title has not been accessible; a brief reference to the topic in question has then been given within brackets. The abbreviations used have mainly been chosen in accordance with those employed in the Astronomischer Jahresbericht. The periodical publication "Knowledge" is not accessible within Sweden, with the exception of some few Separate numbers. It is thus to be feared that articles relevant in the present connection (e.g. by Barnard, Ranyard, and Roberts) have unintentionally been omitted by the author. As a rule, comprehending reviews of a purely popular kind have been excluded. The references concerning adjoining branches of Astronomy (dark nebulae, novae, open clusters, planetaries) have been restricted to a necessary minimum.
See also: VII/9 : Lynds' Catalogue of Bright Nebulae (Lynds 1965) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Ced [1/215] Sequential number (Ced NNNa in Simbad) 4 A1 --- m_Ced [a-z] Subdivision letter 6- 16 A11 --- Name Other name of the nebula 17- 18 I2 h RAh Right ascension (1900) 20- 23 F4.1 min RAm Right ascension (1900) 24 A1 --- u_RAm Uncertainty flag on right ascension 25 A1 --- DE- Declination sign (1900) 26- 27 I2 deg DEd Declination (1900) 29- 30 I2 arcmin DEm ? Declination (1900) 31 A1 --- u_DEd Uncertainty flag on Declination 33- 37 F5.1 deg G1Lon Galactic longitude (5) 39- 43 F5.1 deg G1Lat Galactic latitude(5) 44 A1 --- u_G1Lat Uncertainty flag on G1Lat 45- 56 A12 --- Star Star name 57- 61 F5.2 mag pmag ? Photographic magnitude of the star 62 A1 --- u_pmag [v:] Uncertainty flag on pmag (v: variable) 64- 68 F5.2 mag vmag ? Visual magnitude of the star 69 A1 --- u_vmag [v:] Uncertainty flag on vmag (v: variable) 71- 78 A8 --- SpType Spectrum of the star associated with the nebula 79- 84 F6.3 [arcmin] loga1 ? Value of log(a1) in Hubble's law (1) 85 A1 --- n_loga1 [:] ":" when no reduction to Hubble's system has been possible 87- 89 A3 --- SpNeb Spectrum of the nebula (2) 91- 93 A3 --- Class Nebular class (3) 96-100 F5.1 arcmin Dim1 ? Apparent dimension of the nebula 102-106 F5.1 arcmin Dim2 ? Apparent dimension of the nebula 107 A1 --- n_Dim2 [?:v] Notes on dimensions (v: variable) 109-114 F6.4 arcsec plx ? Adopted parallax 115 A1 --- u_plx Uncertainty flag on plx 117-124 A8 --- Method Parallax method used (4) 125-128 I4 pc Dist ? Adopted Distance 129 A1 --- u_Dist Uncertainty flag on Dist 131-135 I5 pc x ? Linear heliocentric galactic coordinate (x=r*cosl*cosb) (5) 138-142 I5 pc y ? Linear heliocentric galactic coordinate (y=r*sinl*cosb) (5) 144-147 I4 pc z ? Linear heliocentric galactic coordinate (z=r*sinb) (5)
Note (1): Hubble's law expresses the relation between the brightness (m) of a star illuminating the nebula and its maximal distance (a1) to the nebular boundary, as: m + 5 log(a1) = B where B is a constant equal to 11.61 if a1 is expressed in arcmin, assuming isotropic light reflection and zero absorption. Note (2): Spectrum of the nebula: E = emission established by observation e = emission inferred from the spectral type of the exciting star C = continuous spectrum established by observations c = continuous spectrum inferred from the spectral type of the illuminating star Note (3): Classification of Bright Diffuse Nebulae: A: Nebulous clusters. 1: Milky nebulosity covering the clusters. (Ex. NGC 1976) 2: Patches of nebulosity adhering to individual stars of the cluster. (Ex. The Pleiades) 3: Cluster with nebulous envelop of intricate structure. (Ex. NGC 2175) B: Nebulae associated with mainly one star (which may be multiple) 1: Star surrounded by a nebulous envelope without conspicuous structure. (Ex. λ Scorpii) 2: Star surrounded by a nebulous envelope with conspicuous structure. (Ex. IC 5146) 3: Fan-shaped object. (Ex. IC 59) 4: Nebula with bright rim. (Ex. IC 434) 5: Large nebulous region illuminated by a star outside its border. (Ex. NGC 7000) 6: Quasi-planetary, representing a transitional type between real planetaries and bright diffuse nebulae. (Ex. NGC 1514) C: Nebulae without definite relation to certain stars. 1: Detached nebula with discernible structure. (Ex. NGC 6992) 2: Background veil of a nebulous region. (Ex. The Taurus veil) Note (4): Methods are marked as follows: a = spectral parallaxes of associated stars b,c = parallaxes from proper motions of associated stars d = differential secular parallaxes according to the method devised by J.C. Kapteyn e,f = parallaxes based on star counts g = dynamical parallaxes of associated stars h = trigonometric parallaxes of associated stars i = minimum parallaxes from foreground stars j = parallaxes from reflection of starlight against dark matter in the case of nebulae associated with novae and variable stars k = parallaxes from internal motions of the nebulae l = parallaxes from the effect of differential galactic rotation on stellar velocities and interstellar line displacements m = parallaxes from intensities of interstellar lines n = parallaxes of open clusters involved in nebulae Note (5): the galactic coordinates refer to the old system, several degrees away from the modern galactic frame.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Ced [1/215] Sequential number 5- 80 A76 --- Note Text of the note (1)
Note (1): The remarks to the catalogue are self-explanatory. The catalogue acronyms used are: GC = John Herschel's and Dreyer's General Catalogue of nebulae and clusters (Compare ante p 24)., 1888MmRAS..49....1D (NGC Catalog, see VII/1) H = William Herschel. h = John Herschel. The designations H, or h, followed by a number, refer to William and John Herschel's successive catalogues of nebulae and clusters. (Compare Chapter I:2). M = Messier, 1850CDT..1784..227M HD = the Henry Draper catalogue, Cat. III/135 Boss = General Catalogue of 33342 stars for the epoch 1950 by Benjamin Boss, Cat. I/113 In this file have been collected some data and additional references extracted from the card catalogue of bright diffuse galactic nebulae which has been brought together by the author. The current numbers refer to the catalogue entries of the present paper. The content of the bibliographical notes may be summarized as follows: 1. Synonyms of the objects. 2. When known, the name of the discoverer and the year of discovery have been given together with a reference to the source of this data. If the discoverer is not known for certain, the word "source" has been used in combination with a reference to the earliest known paper where the object in question is mentioned. If a series of synonyms is followed by a year of discovery, the discoverer is the last one in the series. Thus, "NGC 3199 = GC 2067 = h3239. Disc.1835", means that the nebula was discovered by John Herschel in 1835. 3. Each nebula has been supplied with references to those papers in the bibliography where it has been treated. Here, some restrictions have been introduced with regard to completeness. Thus, a selection has been deemed necessary with regard to published photographical reproductions of galactic nebulae. Further, the author has not aimed at completeness concerning all papers were a certain nebula has only been mentioned without further information of interest. References to papers in Holden's bibliography have not been included, as Holden has given no current enumeration. An explicit quotation of these papers - which afford for the most part a historical interest only - would have unduly augmented the present section. Besides, references to earlier publications are to be found in the NGC and in some of the papers of the bibliography, e.g. in (114) and (119). No (481) in the bibliography (Lundmark's manuscript) contains (mostly stellar) data for the following nebulae in the catalogue: No: 3, 4, 7, 12, 13, 16, 18, 19, 20 , 22, 25, 28, 30, 31, 32, 34, 35, 37, 38, 40, 41, 42, 43, 46, 49, 52, 54, 55, 62, 63, 65, 66, 67, 68, 69, 74, 76, 77, 78, 80, 81, 83, 84, 89, 90, 94, 96, 109, 123, 125, 129, 130, 131, 132, 133, 139, 151, 152, 154, 157, 161, 163, 165, 176, 179, 183, 186, 187, 194, 195, 196, 198, 209, 210, 211.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Ref *Reference number 5- 80 A76 --- Text Complete reference
Note on Ref: * Herassimovitch (343) is identical with Gerasimovic (272). William Huggins' papers are also to be found in "The scientific papers" of Sir William Huggins, London 1909. * For (119) the year of publication is not known to the author. The paper is reviewed in the AJB of 1919. It has, however, very likely been printed several years earlier as the name of Peiresc is not mentioned in connection with the discovery of the Orion nebula. * (574) refers to articles on galactic nebulae by Ranyard. The exact titles are not known to the author.
History: * 29-Jan-2001: Prepared via OCR at CDS. * 04-Feb-2009: Declination sign corrected for Ced 71 (thanks to Brian Skiff, Lowell Obs.)
(End) James Marcout, Patricia Bauer, Francois Ochsenbein [CDS] 29-Jan-2001
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