4.6 Article

The type Ia supernova 2001V in NGC 3987

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ASTRONOMY & ASTROPHYSICS
卷 397, 期 1, 页码 115-120

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E D P SCIENCES
DOI: 10.1051/0004-6361:20021469

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stars : supernovae : individual : SN2001V

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CCD photometry is presented of the type Ia SN 2001V occurred in the edge-on spiral galaxy NGC 3987. The observations made through Johnson-Cousins BVRI filters were collected from Feb. 24 (t = 8 days, with respect to B-maximum), up to May 5 (t = +62 days). The light curves are analyzed with the revised Multi-Colour Light Curve Shape (MLCS) method (Riess et al. 1998) by fitting template vectors to the observed light curves simultaneously. The reddening of SN 2001V is estimated to be E(B-V) = 0.05 mag, while the galactic component is E(B-V) = 0.02 mag (Schlegel et al. 1998), suggesting that part of the reddening may be due to the ISM in the host galaxy. The Delta parameter in MLCS converged to 0:47 mag, indicating that this SN was overluminous relative to the majority of Type Ia SNe. The inferred distance to its host galaxy, NGC 3987, is 74.5 +/- 5 Mpc, which is in good agreement with recently determined kinematic distances, based on radial velocity corrected for Virgo-infall and Hubble constant H-0 = 65 km s(-1) Mpc(-1).

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