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 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:
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RA (2000) DE Designation(s)
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20 34 51.4 +60 09 18 NGC 6946 = MCG+10-29-006
20 34 44.3 +60 07 19 SN 2002hh = SN 2002hh
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 36 110 *Tertiary VRI photometric standards for NGC 6946
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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.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Jan-2010