EDP Sciences
Free access
Volume 372, Number 3, June IV 2001
Page(s) 824 - 832
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20010573

A&A 372, 824-832 (2001)
DOI: 10.1051/0004-6361:20010573

Distance to the Active Galaxy NGC 6951 via the type Ia Supernova 2000E

J. Vinkó1, B. Csák1, 2, Sz. Csizmadia3, G. Fürész4, 5, L. L. Kiss4, 5, K. Sárneczky6, 2, 5, Gy. Szabó4, 2, 5, K. Sziládi4, 5 and I. B. Bíró7, 5

1  Department of Optics & Quantum Electronics, University of Szeged, POB 406, Szeged 6701, Hungary
2  Visiting Astronomer, German-Spanish Astronomical Centre, Calar Alto, Spain
3  Konkoly Observatory of the Hungarian Academy of Sciences, POB 67, Budapest 1525, Hungary
4  Department of Experimental Physics, University of Szeged, Dóm tér 9, Szeged 6720, Hungary
5  Guest Observer, Piszkésteto Station, Konkoly Observatory, Hungary
6  Department of Physical Geography, ELTE University, Ludovika tér 2, Budapest 1088, Hungary
7  Baja Observatory, POB 766, Baja 6500, Hungary

(Received 11 October 2000 / Accepted 9 April 2001)

CCD-photometry and low-resolution spectroscopy of the bright supernova SN 2000E in NGC 6951 are presented. Both the light curve extending up to 150 days past maximum and the spectra obtained at 1 month past maximum confirm that SN 2000E is of type Ia. The reddening of SN 2000E is determined as $E(B-V) = 0.36 \pm 0.15$, its error is mainly due to uncertainties in the predicted SN (B-V) colour at late epochs. The $V (RI)_{\rm C}$ light curves are analyzed with the Multi-Colour Light Curve Shape (MLCS) method. The shape of the late light curve suggests that SN 2000E was overluminous by about 0.5 mag at maximum comparing with a fiducial SN Ia. This results in an updated distance of $33 \pm 8$ Mpc of NGC 6951 (corrected for interstellar absorption). The SN-based distance modulus is larger by about +0.7 mag than the previous Tully-Fisher estimates. However, possible systematic errors due to ambiguities in the reddening determination and estimates of the maximum luminosity of SN 2000E may plague the present distance measurement.

Key words: stars: supernovae -- individual: SN 2000E

Offprint request: J. Vinkó, vinko@physx.u-szeged.hu

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