II/222 Standard magnitudes in the E regions (Cousins+ 1962) ================================================================================ Standard magnitudes in the E regions Cousins A.W.J., Stoy R.H. =1962RGOB...49....3C (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Photometry, standards ; Photometry, UBV ; Photometry, photographic ; Photometry, UcBV Description: A single table combines the revised and extended results of 24 series of photometric observations made in South Africa between 1947 and 1960 on the nine Harvard E regions at declination -45{deg}. For each of about 90 stars in each region are tabulated V and B-V on the standard U,B,V system, an ultraviolet-free blue magnitude S'Pg, a photovisual magnitude SPv and, in most cases, an ultraviolet minus blue colour (U-B)_C_. The internal standard error of an entry is +/-0.01mag or less. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file ereg.dat 120 879 Catalogue of the E regions (Table 2 and appendix combined with Table 4) notes.dat 80 188 Notes to individual stars obs.dat 52 24 Observation log (Table 1 of paper) -------------------------------------------------------------------------------- Byte-by-byte Description of file: ereg.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 A6 --- [CS62] Star denomination EN NNN (G1) 7 A1 --- Note [*] Duplicated photometry (4) 9- 14 I6 --- HD ? HD (Cat. ) number 16- 18 A3 --- SpType Spectral type 20- 24 F5.2 mag Vmag ? V magnitude 25 A1 --- n_Vmag [*] Note about rounding on Vmag value (1) 26 A1 --- u_Vmag [):v] Uncertainty flag or variability on Vmag (2) 28- 32 F5.2 mag B-V ? B-V colour index 33 A1 --- n_B-V [*] Note about rounding on B-V value (1) 34 A1 --- u_B-V [):v] Uncertainty flag or variability on B-V (2) 36- 40 F5.2 mag S'Pg ? S'Pg magnitude (3) 41 A1 --- n_S'Pg [*] Note about rounding on S'Pg value (1) 42 A1 --- u_S'Pg [):v] Uncertainty flag or variability on S'Pg (2) 44- 48 F5.2 mag SPv ? SPv magnitude (3) 49 A1 --- n_SPv [*] Note about rounding on SPv (1) 50 A1 --- u_SPv [):v] Uncertainty flag or variability on SPv (2) 52- 56 F5.2 mag S'CI ? S'CI (S'Pg - SPv) magnitude 57 A1 --- n_S'CI [*] Note about rounding on S'CI (1) 58 A1 --- u_S'CI [):v] Uncertainty flag or variability on S'CI (2) 59- 63 F5.2 mag U-Bc ? Cape U-B colour index 64 A1 --- u_U-Bc Uncertainty flag on U-Bc 66- 74 A9 --- MKtype MK spectral type 76 A1 --- Rem [R] if a remark detailed in "notes.dat" file 78 A1 --- H Havard letter (Pickering, 1917AnHar..71..233P) 81 A1 --- n_CZC [f] Note on CZC number (5) 82- 86 I5 --- CZC ? CZC name (Cat. ) (5) 89- 97 A9 --- CPD ? CPD (Cat. ) number 99-100 I2 h RAh ? Right ascension (1950) 102-103 I2 min RAm ? Right ascension (1950) 105-106 I2 s RAs ? Right ascension (1950) 108 A1 --- DE- Declination sign 109-110 I2 deg DEd ? Declination (1950) 112-113 I2 arcmin DEm ? Declination (1950) 115-119 F5.2 mag U-B ? Provisional Johnson U-B colour index (6) 120 A1 --- u_U-B Uncertainty flag on U-B -------------------------------------------------------------------------------- Note (1): '*': the data have usually been rounded off the nearest 0.005mag; the * following the last digit indicates that the figure in the next place would be a five Note (2): the symbol has the following meaning: ')': unreliable magnitude ':': magnitude suspected to have a uncertainty greater than 0.01mag 'v': variable Note (3): S'Pg is close to the natural system of the blue observations of Series 18, which were made with the 24-inch Victoria refractor. S'Pg is an "ultraviolet-free" version of SPg, the photographic magnitude system which, with SPv, was set up in 1953 and adopted as standard for the Cape Photographic Catalogues for 1950.0 (catalog ) Note (4): results for star E6 83 = HD 127972/3, and E6 85/86 are repeated on two consecutive lines. Note (5): 'f' when Cape refers to the "Catalogue of 20554 faint stars in the Cape astrographic zone -40 to -52{deg} for the equinox of 1900.0" (catalogue ). The number otherwise refers to the Cape Zone Catalogue (catalogue ) Note (6): The provisional U-B colours, which are given for most of the stars brighter than B=9.0, are on the standard UBV system and have been determined with the 18-inch reflector as part of Series 25 and its extension (cf. obs.dat). The photometer has an EMI type 6094 photo-multiplier and the filters used are of Schott glass, 1mm UG2 for the U observations and 1mm BG12 + 3mm GG13 for the B observations. These particular filters were chosen because it was believed that they would give a natural colour system close to the standard one. Actually the relationship between the natural and standard U-B colours is not quite linear and involves a term in B-V. -------------------------------------------------------------------------------- Byte-by-byte Description of file: notes.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 A6 --- [CS62] Star denomination EN NNN, repeated when several lines are needed (G1) 8- 80 A73 --- Note Text of the note (1) -------------------------------------------------------------------------------- Note (1): Magnitudes and separation of double stars have generally been taken from the Southern Double Star Catalogue; in some cases data have been obtained from the Cape Astrographic Zones, or by direct measurement of photographic charts. These data are given merely to indicate that photometric measures may be affected by the presence of companions. No reference is made to companions more than five magnitudes fainter than the primary star. Individual photometric series are referred to by the numbers in file "obs.log", followed by a 'b', 'y', etc. if a particular colour is involved. Magnitude ranges when quoted for individual series are the extreme ranges and not the probable ranges of variability in a few cases the latter is given, but without reference to a particular series. When well-determined means for different series differ by 0.04mag or more, this is noted. When this applies to V and not to S'Pg it is not safe to assume that the star is variable. In some cases transformation errors may be involved. In a few cases, especially in E7, background stars are troublesome. -------------------------------------------------------------------------------- Note (G1): centres of the E Regions (table 3) ------------------------------------------------------------- E RA (1900) DE P{alpha} P{delta} RA (1950) DE GLON GLAT h m deg ' s " h m deg ' deg deg ------------------------------------------------------------- 1 1 20 45 00 +2.62 +18.84 1 22 44 44 248 -71 2 4 00 45 00 +1.91 +10.02 4 02 44 52 158 -35 3 6 40 45 00 +1.76 -3.48 6 41 45 03 221 -19 4 9 20 45 00 +2.21 -15.36 9 22 45 13 237 +4 5 12 00 45 00 +3.07 -20.04 12 03 45 17 263 +16 6 14 40 45 00 +3.93 -15.36 14 43 45 13 291 +12 7 17 20 45 00 +4.40 -3.48 17 24 45 03 312 -7 8 20 00 45 00 +4.23 +10.02 20 04 44 52 322 -33 9 22 40 45 00 +3.51 +18.84 22 43 44 44 316 -61 ------------------------------------------------------------- Byte-by-byte Description of file: obs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Series Series (1) 4- 10 A7 --- Date Observation date 14- 18 A5 --- Inst Instrument (2) 20- 24 A5 --- Colours Colours 27- 30 F4.1 mag mag1 Magnitude range (upper value) 33- 36 F4.1 mag mag2 Magnitude range (lower value) 40- 45 A6 --- Region E regions concerned 46- 48 I3 --- Nstar Number of stars observed 50- 52 A3 --- Ref References (3) -------------------------------------------------------------------------------- Note (1): 2 to 7: Fabry Series 8 to 25: Photoelectric Series Note (2): C.13 Cape astrographic photographic refractor, 13-inch aperture, f/11 C.18 Cape Cassegrain reflector (aluminized), 18-inch aperture, f/11 C.18V Cape Victoria visual refractor, 18-inch aperture, f/15 C.24 Cape Victoria photographic refractor, 24-inch aperture, f/11 B.60 Boyden Observatory, 60-inch reflector (silvered) P.74 Radcliffe Observatory, 74-inch reflector (silvered) Note (3): a : A.W.J. Cousins, 1950MNRAS.110..531C b : Cape Mimeogram No.4,1953 c : Cape Observers d : I.R. King, 1955AJ.....60..391K e : J.B. Irwin and A.N. Cox f : Unpublished g : J.B. Irwin h : Halton C. Arp, A.J., 1958AJ.....63..118A -------------------------------------------------------------------------------- History: Prepared via OCR at CDS. Tables 2, 4 and Appendix to Table 2 were merged into the file ereg.dat ================================================================================ (End) James Marcout, Patricia Bauer, Francois Ochsenbein [CDS] 06-Apr-1998