An estimate of the masses of the stars that produced SN1923a and SN1957d

Details An estimate of the masses of the stars that produced SN1923a and SN1957d An estimate of the masses of the stars that produced SN1923a and SN1957d

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1538p&link_type=abstract

Astronomical Journal, vol. 87, Nov. 1982, p. 1538-1545.

Astronomy and Astrophysics

Astronomy

17

Spiral Galaxies, Stellar Evolution, Stellar Mass, Stellar Spectrophotometry, Supernovae, Ubv Spectra, Digital Data, H Ii Regions, Hydrogen Ions, Image Processing, Interstellar Extinction, Star Clusters

Scientific paper

Surface photometry and digital image processing techniques were employed to analyze the immediate stellar neighborhoods of the sites of the two supernovae SN1923a and SN1957d, in the spiral galaxy M83. The U-B, B-V integrated colors in the H II region containing the Type II SN1923a were determined to be -0.42 + or - 0.09 and 0.39 + or - 0.07. For a square area around SN1957d they were found to be -0.37 + or - 0.13 and 0.34 + or - 0.12. Ages for these two regions were estimated using model cluster evolution tracks and assuming Whitford reddening (1.0 +1.2, -0.7) x 10 to the 7th, and (1.7 +1.1, -0.6) x 10 to the 7th years, respectively. Lifetimes have been yielded for stars with solar masses of (18 greater than +22, -8) and (11 +5, -2), according to published evolution calculations. These results provide evidence that Type II supernova SN1923a was associated with a high mass star. Finally, it is noted that type unknown SN 1957d may have been associated with an H II complex, but the establishment of a relationship is precluded by the fact that diverse features exist around the site.

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