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J/AJ/132/378        HST and UV photometry of NGC 6822         (Bianchi+, 2006)

The recent star formation in NGC 6822 from Hubble space telescope imaging. Bianchi L., Efremova B.V. <Astron. J., 132, 378-392 (2006)> =2006AJ....132..378B
ADC_Keywords: Galaxies, photometry ; Photometry, HST ; Ultraviolet Keywords: galaxies: individual (NGC 6822) - galaxies: photometry - galaxies: stellar content - Local Group Abstract: We present Hubble Space Telescope WFPC2 and STIS imaging of the low-metallicity galaxy NGC 6822, performed as part of a study of the young stellar populations in the galaxies of the Local Group. Eleven WFPC2 pointings, with some overlap, cover two regions extending over 19 and 13arcmin2, respectively, off the galaxy center. The filters used are F170W, F255W, F336W, F439W, and F555W. One 25x25 field observed with the STIS FUV- and NUV-MAMA includes Hodge's OB 8 association and the HII region Hubble V, contained in field 1 of Bianchi et al. (2001, Cat. J/AJ/121/2020); this previous study provides additional WFPC2 four-band photometry. We derive the physical parameters of the stars in the fields and the extinction by comparing the photometry to grids of model magnitudes. Description: HST imaging of different regions in NGC 6822 were obtained between 2000 June 16 and 2002 May 24 as part of the program GO-8675 (principal investigator L. Bianchi) to study the massive star content of this galaxy, with the WFPC2 and the STIS imagers. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 131 1713 WFPC2 photometry for the hottest stars table4.dat 99 59 STIS photometry
See also: J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995) J/AJ/121/2020 : CTIO and WFPC2 photometry in NGC 6822 (Bianchi+, 2001) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 8 A8 --- --- (BE-WFPC2) 10- 13 I4 --- BE-WFPC2 Object identification (1) 15- 16 I2 h RAh Hour of Right Ascension (J2000) 18- 19 I2 min RAm Minute of Right Ascension (J2000) 21- 26 F6.3 s RAs Second of Right Ascension (J2000) 28 A1 --- DE- Sign of the Declination (J2000) 29- 30 I2 deg DEd Degree of Declination (J2000) 32- 33 I2 arcmin DEm Arcminute of Declination (J2000) 35- 39 F5.2 arcsec DEs Arcsecond of Declination (J2000) 41- 45 F5.2 mag F555W WFPC2 F555W filter magnitude (2) 47- 51 F5.2 mag e_F555W Error in F555W (2) 53- 57 F5.2 mag F439W WFPC2 F439W filter magnitude (2) 59- 63 F5.2 mag e_F439W Error in F439W (2) 65- 69 F5.2 mag F336W ?=99.00 WFPC2 F336W filter magnitude (2) 71- 75 F5.2 mag e_F336W ?=99.00 Error in F336W (2) 77- 81 F5.2 mag F255W ?=99.00 WFPC2 F255W filter magnitude (2) 83- 87 F5.2 mag e_F255W ?=99.00 Error in F255W (2) 89- 93 F5.2 mag F170W ?=99.00 WFPC2 F170W filter magnitude (2) 95- 99 F5.2 mag e_F170W ?=99.00 Error in F170W (2) 101-105 F5.2 mag E(B-V) ?=-1 The reddening E(B-V) value (3) 107-110 F4.2 mag e_E(B-V) ?=-1 Error in E(B-V) (3) 112-116 I5 K Teff ?=-1 Effective temperature (3) 118-123 I6 K e_Teff ?=0 Lower limit error on Teff (4) 125-129 I5 K E_Teff ?=0 Upper limit error on Teff (4) 131 A1 --- Meth Teff & E(B-V) determination method flag (5)
Note (1): Stars with five bands measurements are listed first, then stars with U, B, and V measurements ("wider sample" - see text), then stars with only B and V measurements better than 0.2mag are given at the end. Note: only stars with errors smaller than 0.2mag in both F555W and F439W are included in the table. Note (2): In the Vega system. Value is 99.00 if below detection threshold in a band or saturated. Note (3): -1 = value not determined. Note (4): 0: The SED solution is close to the minimum or maximum Teff of the models considered in the fitting process. Therefore the formal errors are not meaningful in this case. Note (5): Flags as follows: a = Teff and E(B-V) determined from a Chi2 fit. b = Teff and E(B-V) determined from Q336439_555. c = Mean value of E(B-V)=0.27 adopted, Teff determined from B-V, Teff relation. d = Mean value of E(B-V)=0.22 adopted, Teff determined from B-V, Teff relation. n = Teff and E(B-V) were not determined.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 A7 --- --- (BE-STIS) 9- 10 I2 --- BE-STIS Object identification 12- 13 I2 h RAh Hour of Right Ascension (J2000) 15- 16 I2 min RAm Minute of Right Ascension (J2000) 18- 23 F6.3 s RAs Second of Right Ascension (J2000) 25 A1 --- DE- Sign of the Declination (J2000) 26- 27 I2 deg DEd Degree of Declination (J2000) 29- 30 I2 arcmin DEm Arcminute of Declination (J2000) 32- 36 F5.2 arcsec DEs Arcsecond of Declination (J2000) 38- 42 F5.2 mag NUVmag STIS Near-UV filter Vega magnitude (2) 44- 47 F4.2 mag e_NUVmag Uncertainty in NUV 49- 53 F5.2 mag FUVmag STIS Far-UV filter Vega magnitude (2) 55- 58 F4.2 mag e_FUVmag Uncertainty in FUV 60- 63 F4.2 mag E(B-V) ? The reddening E(B-V) value 64 A1 --- u_E(B-V) Uncertainty flag on E(B-V) 66- 69 F4.2 mag e_E(B-V) ? Uncertainty in E(B-V) 71- 75 I5 K Teff ? Effective temperature 77- 81 I5 K E_Teff ? Upper limit error in Teff 83- 87 I5 K e_Teff ? Lower limit error in Teff 88 A1 --- u_Teff Uncertainty flag on Teff 90- 99 A10 --- [BSM2001] Identification (1)
Note (1): The cross-identification with the WFPC2 photometric study by Bianchi et al. (2001, Cat. J/AJ/121/2020). Note (2): Filters FUV-MAMA (1595±206Å) and NUV-MAMA (2010±681Å)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-Sep-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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