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Metallicity at Galactocentric Radius of Type Ia SN PTF11kly in M101

ATel #3588; R. Stoll, B. Shappee, K. Z. Stanek (Ohio State University)
on 25 Aug 2011; 19:23 UT
Credential Certification: Rebecca Stoll (stoll@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae

We report that the recently discovered type Ia SN PTF11kly in M101 (ATEL #3581) is at a projected galactocentric distance that corresponds to an oxygen abundance of 12+log(O/H) = 8.45 +/- 0.05, according to the M101 gas-phase oxygen abundance gradient of Bresolin et al. (2007,ApJ,656,186), assuming that the SN is in the plane of the disk. This corresponds to approximately 0.39 x Solar, using the solar oxygen abundance of 8.86 found by Delahaye & Pinsonneault (2006,ApJ,649,529), or 0.58 x Solar, using the solar oxygen abundance of 8.69 from Asplund et al. (2009,ARA&A,47,481). The deprojected radius of the SN is 0.3301 isophotal radii, assuming an isophotal radius of 14.4 arcminutes from de Vaucoleurs (1991,3RC). This corresponds to a physical galactocentric distance of 8.9 +/- 0.8 kpc using the distance to M101 of 6.4 Mpc from Shappee & Stanek (2011,ApJ,733,124).