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Two new eJAAVSO preprints: Sloan Magnitudes for the Brightest Stars; BVRI Photometry of SN 2013ej

ejaavso 276

Sloan Magnitudes for the Brightest Stars

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Anthony Mallama

14012 Lancaster Lane, Bowie, MD 20715

Received April 8, 2014; revised June 23, 2014; accepted July 8, 2014

Abstract

Sloan magnitudes are reported for 3,969 stars brighter than r' ~ 7. The data are based upon Johnson-Cousins photometry which has been transformed to the Sloan system. Cousins V–RC and RC–IC color indices are also provided as a by-product.

 

ejaavso 275

BVRI Photometry of SN 2013ej in M74

   pdf

Michael W. Richmond

School of Physics and Astronomy, Rochester Institute of Technology, 84 Lomb Memorial Drive, Rochester, NY 14623

Received May 19, 2014; revised June 24, 2014; accepted June 25, 2014

Abstract

I present BVRI photometry of the type IIP supernova 2013ej in M74 from 1 to 179 days after its discovery. These photometric measurements and spectroscopic data from the literature are combined via the expanding photosphere method to estimate the distance to the event, which is consistent with that derived by other methods. After correcting for extinction and adopting a distance modulus of (m – M) = 29.80 mag. to M74, I derive absolute magnitudes MB = –17.36, MV = –17.47, MR = –17.64, and MI = –17.71. The differences between visual measurements and CCD V-band measurements of SN 2013ej are similar to those determined for type Ia supernovae and ordinary stars.

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