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J/ApJ/669/525        VRI photometric standards for NGC 6946  (Welch+, 2007)

An extremely bright echo associated with SN 2002hh. Welch D.L., Clayton G.C., Campbell A., Barlow M.J., Sugerman B.E.K., Meixner M., Bank S.H.R. <Astrophys. J., 669, 525-533 (2007)> =2007ApJ...669..525W
ADC_Keywords: Galaxies, nearby ; Stars, standard ; Photometry, VRI Keywords: dust, extinction - scattering - supernovae: general Abstract: We present new, very late time optical photometry and spectroscopy of the interesting Type II-P supernova SN 2002hh, in NGC 6946. Gemini/GMOS-N has been used to acquire visible spectra at six epochs between 2004 August and 2006 July, following the evolution of the SN from age 661 to 1358-days. Few optical spectra of Type II supernovae with ages greater than 1yr exist. In addition, g', r', and i' images were acquired at all six epochs. The spectral and photometric evolution of SN 2002hh has been very unusual. Measures of the brightness of this SN, both in the R and I bands, as well as in the Halpha emission flux, show no significant fading over an interval of nearly 2-years. Description: Spectroscopy was obtained using the Gemini North telescope and the GMOS-N instrument during semesters 2004B, 2005B, and 2006A. Three spectra of duration 900s each were obtained on 2004 August 20. Two additional epochs for SN 2002hh in 2004 were obtained using Director's Discretionary (DD) time. On 2004 October 8, three spectra, each of 720 s duration. Objects: ------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------ 20 34 51.4 +60 09 18 NGC 6946 = MCG+10-29-006 20 34 44.3 +60 07 19 SN 2002hh = SN 2002hh ------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 36 110 *Tertiary VRI photometric standards for NGC 6946
Note on table2.dat: the finding chart is Fig.6 of the article, at http://ej.iop.org/images/0004-637X/669/1/525/Full/fg6.gif an image of 149x335" (0.1454"/pix) where North is 10° counterclockwise from vertical, East 90° clockwise from North.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [WCC2007] Star number 5- 9 F5.2 mag Vmag V magnitude 11- 14 F4.2 mag e_Vmag rms uncertainty on Vmag 16- 20 F5.2 mag Rmag R magnitude 22- 25 F4.2 mag e_Rmag rms uncertainty on Rmag 27- 31 F5.2 mag Imag I magnitude 33- 36 F4.2 mag e_Imag rms uncertainty on Imag
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Jan-2010
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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