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Issue A&A
Volume 408, Number 3, September IV 2003
Page(s) 915 - 919
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20031008



A&A 408, 915-919 (2003)
DOI: 10.1051/0004-6361:20031008

Photometry of SN 2002bo with template image subtraction

Gy. M. Szabó1, 2, K. Sárneczky3, 2, J. Vinkó3, 2, B. Csák1, 2, Sz. Mészáros3, 2, P. Székely1, 2 and Zs. Bebesi2

1  Department of Experimental Physics & Astronomical Observatory, University of Szeged, 6720 Szeged, Dóm tér 9., Hungary
2  Guest Observer at Piszkésteto Station, Konkoly Observatory, Hungary
3  Department of Optics & Quantum Electronics & Astronomical Observatory, University of Szeged, POB 406, 6701 Szeged, Hungary

(Received 3 June 2003 / Accepted 24 June 2003)

Abstract
VRI photometry of the type Ia supernova 2002bo is presented. This SN exploded in a dusty region of the host galaxy NGC 3190, thus, subtraction of a template frame was necessary to obtain reliable photometry. We used a template frame of NGC 3190 taken during the course of our galaxy imaging project, fortunately, just a few days before SN 2002bo was discovered. The aim of this project is to collect template frames of nearby galaxies that are potential hosts of bright SNe. Subtraction of pre-SN images helped us to exclude the background light contamination of the host galaxy. The maximum occurred at JD 2 452 346, with maximal  V brightness of 13 $\fm$58. MLCS analysis led to T0(B) = JD 2 452 $346.1\pm 0.8$ (fiducial B-maximum), $E(B-V),= 0\fm24 \pm0\fm02$, $\mu_0=32.46\pm0.06$, $\Delta=-0.14\pm0.04$. $E(B-V)=0\fm24(2)$ indicates a significant extinction in the host galaxy as the galactic reddening is negligible toward NGC 3190. The accepted value of  $\Delta$ indicates that SN 2002bo was a slightly overluminous SN by about 0 $\fm$14 relative to fiducial SN type Ia. The distance turned out to be $31.0\pm3$ Mpc. In addition, the heavily obscured SN 2002cv was also detected on the I frame taken on JD 2 452 434 (June 8, 2002), and a variable star is found in the field, very close to the host galaxy.


Key words: supernovae: individual: SN 2002bo, SN 2002cv -- galaxies: fundamental parameters -- stars: variables

Offprint request: Gy. M. Szabó, szgy@mcse.hu

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