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J/AJ/121/2020      CTIO and WFPC2 photometry in NGC 6822       (Bianchi+, 2001)

The massive star content of NGC 6822: ground-based and Hubble Space Telescope photometry. Bianchi L., Scuderi S., Massey P., Romaniello M. <Astron. J. 121, 2020 (2001)> =2001AJ....121.2020B
ADC_Keywords: Galaxies, photometry ; Photometry, UBV Keywords: galaxies: individual (NGC 6822) - galaxies: stellar content - Local Group - stars: formation - stars: luminosity function, mass function - color-magnitude diagrams Abstract: We investigate the massive star population of NGC 6822 with ground-based UBV photometry covering the whole of the galaxy and HST WFPC2 photometry with filters F255W, F336W, F439W, and F555W of two fields containing very rich and crowded OB associations. The four-band WFPC2 photometry is used to derive Teff and E(B-V). H-R diagrams are constructed for the OB associations included in our fields. These show that 10Myr old populations are present in OB 9 and OB 6, while more recent star formation have occurred in OB 8, OB 13, OB 15, and OB 7. Two particularly interesting H II regions, Hubble V and Hubble X, are included in our fields. The luminous massive stars that power these bright H II regions (Hα luminosity several times that of the Orion nebula), could be resolved even in their dense cores thanks to the HST spatial resolution. Our data reveal very young (a few million years), apparently coeval populations, with several massive star candidates. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 53 3232 CTIO Photometry table3.dat 60 1025 WFPC2 Photometry
See also: J/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- [BSM2001] Star name (CTIO-NNNN, [BSM2001] CTIO-NNNN in Simbad) 11- 12 I2 h RAh Right Ascension (J2000) 14- 15 I2 min RAm Right Ascension (J2000) 17- 22 F6.3 s RAs Right Ascension (J2000) 24 A1 --- DE- Sign of the Declination (J2000) 25- 26 I2 deg DEd Declination (J2000) 28- 29 I2 arcmin DEm Declination (J2000) 31- 35 F5.2 arcsec DEs Declination (J2000) 37- 41 F5.2 mag Vmag CTIO V-band magnitude 43- 47 F5.2 mag B-V CTIO (B-V) color index 49- 53 F5.2 mag U-B CTIO (U-B) color index
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- [BSM2001] Star name (LB-f1- NNN or LB-f2- NNN, [BSM2001] LB-f1-NNN or [BSM2001] LB-f2-NNN in Simbad) 12- 13 I2 h RAh Right Ascension (J2000) 15- 16 I2 min RAm Right Ascension (J2000) 18- 23 F6.3 s RAs Right Ascension (J2000) 25 A1 --- DE- Sign of the Declination (J2000) 26- 27 I2 deg DEd Declination (J2000) 29- 30 I2 arcmin DEm Declination (J2000) 32- 36 F5.2 arcsec DEs Declination (J2000) 38- 42 F5.2 mag Vmag WFPC2 V-band (F555W) magnitude 44- 48 F5.2 mag Bmag WFPC2 B-band (F439W) magnitude 50- 54 F5.2 mag Umag WFPC2 U-band (F336W) magnitude 56- 60 F5.2 mag F255W WFPC2 F255W filter magnitude
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 30-Aug-2001
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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