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J/A+A/548/A129      HST photometry in NGC 6822               (Fusco+, 2012)

Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822. Fusco F., Buonanno R., Bono G., Cassisi S., Monelli M., Pietrinferni A. <Astron. Astrophys. 548, A129 (2012)> =2012A&A...548A.129F
ADC_Keywords: Galaxies, photometry; Photometry, HST; Stars, distances Keywords: galaxies: dwarf - Local Group - galaxies: individual: NGC 6822 Abstract: On the basis of a new photometric analysis of the Local Group dwarf irregular galaxy NCG 6822 based on observations obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope, we have obtained a new estimate of the extinction of two fields located in the southeast region of the galaxy. Because of significant differences in the distance estimates to NGC 6822 available in literature, we decided to provide an independent determination of the distance to this galaxy based on an updated and self-consistent theoretical calibration of the tip of the red giant branch brightness. As a result we newly determined the distance to NGC 6822 to be equal to (m-M)0=23.54±0.05, and compared our measurement with the most recent determinations of this distance. Description: We performed HST photometry on three fields in the south-east region of NGC 6822 galaxy. The resulting catalogues contain ∼140,000, ∼42,000, ∼12,000 stars, from the innermost to the outermost field. Data were calibrated using the VEGAMAG system. Data are stored in three files, one for each field: central field: n6822_0.dat middle field: n6822_a.dat outer field: n6822_b.dat File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file n6822_0.dat 123 139089 Photometric catalogue in F475W and F814W HST bands for the innermost field n6822_a.dat 123 42279 Photometric catalogue in F475W and F814W HST bands for the middle field n6822_b.dat 123 11683 Photometric catalogue in F475W and F814W HST bands for the outermost field
See also: J/AJ/109/173 : BVR photometry of NGC 6822 (Marconi+ 1995) 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) J/AJ/123/832 : C star population in NGC 6822 (Letarte+, 2002) J/A+A/429/837 : IJKs photometry of late-type stars in NGC 6822 (Cioni+, 2005) J/A+A/431/1189 : BV photometry of NGC 6822 variables (Baldacci+, 2005) J/A+A/454/717 : NGC 6822 near-IR photometry of C and AGB stars (Kang+, 2006) J/A+A/456/905 : JKs, i'g'r' photometry of C stars in NGC 6822 (Demers+, 2006) J/AJ/128/2815 : ARAUCARIA: NGC 6822 Cepheid variables (Pietrzynski+, 2004) J/AJ/132/378 : HST and UV photometry of NGC 6822 (Bianchi+, 2006) J/AJ/132/1372 : Chandra observation of NGC 6822 (Tennant+, 2006) J/ApJ/647/1056 : ARAUCARIA: NGC 6822 Cepheid variables (Gieren+, 2006) J/A+A/450/873 : NGC 6822 bright variables VI phot. (Mennickent+, 2008) J/A+A/495/447 : PN and HII regions in NGC6822 (Hernandez-Martinez+, 2009) J/A+A/537/A108 : NGC 6822 AGB spectroscopic catalogue (Kacharov+, 2012) J/A+A/540/A135 : AGB population of NGC 6822 (Sibbons+, 2012) Byte-by-byte Description of file: n6822_0.dat n6822_a.dat n6822_b.dat
Bytes Format Units Label Explanations
1- 6 I6 --- ID Star identification number 8- 15 F8.3 pix Xpos X coordinate in pixels 17- 24 F8.3 pix Ypos Y coordinate in pixels 28- 33 F6.3 mag F475W Magnitude in HST/ACS F475W band 37- 42 F6.4 mag e_F475W Error associated to F475W magnitude 46- 51 F6.3 mag F814W Magnitude in HST/ACS F814W band 55- 60 F6.4 mag e_F814W Error associated to F814W magnitude 63- 69 F7.4 --- Chi Mean value of the χ image-quality index 72- 78 F7.4 --- Sharp Mean value of the sharp image-quality index (<0 for cosmic rays, >0 for resolved sources) 82- 83 I2 h RAh Right ascension (J2000) 87- 88 I2 min RAm Right ascension (J2000) 91- 97 F7.4 sec RAs Right ascension (J2000) 101 A1 --- DE- Declination sign (J2000) 102-103 I2 deg DEd Declination (J2000) 108-109 I2 arcmin DEm Declination (J2000) 113-118 F6.3 arcsec DEs Declination (J2000) 123 I1 --- Chip [1/2] Chip of the camera (1=WFC1, 2=WFC2)
Acknowledgements: Federica Fusco, federica.fusco(at)
(End) Federica Fusco [Rome Tor Vergata Univ.] Patricia Vannier [CDS] 14-Nov-2012
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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