Magnitudes and colors of SN 1993J comparison stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Catalogs, Stellar Color, Stellar Magnitude, Supernovae, Astronomical Maps, Astronomical Photometry, Sky Surveys (Astronomy), Tables (Data)

Scientific paper

A catalog and finding chart with cross-identifications to other charts and calalogs, are provided for 36 comparison stars of SN 1993J within 16 min from the center of M81. Revised V-band magnitudes and-where available-U-B, B-V, V-Rc, and V-Ic colors are listed for 35 stars with 9.5 less than or equal to V less than or equal to 15.5, and a fainter one ('a') at V = 17.8. For stars more than 6 min from the nucleus of M81, the Guide Star Catalog (GSC) photovisual magnitudes, mpv, can be converted to the V system, through V* = mpv + 0.04 + 0.15 (B-V), with a mean error of 0.03 mag when the color index is known and, less precisely, V* = mpv + 0.50 +/- -0.1 mag, when it is not.

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