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SN 1917A

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SN 1917A
Event typeSupernova
Type II
Date19 July 1917
InstrumentG. W. Ritchey
ConstellationCepheus
Right ascension20 34 46.9
Declination+60° 07′ 29″
Distance22 Mly (6.8 Mpc)
HostNGC 6946
Peak apparent magnitude13.60
Preceded bySN 1916A
Followed bySN 1919A
[edit on Wikidata]

SN 1917A is a supernova event in the Fireworks Galaxy (NGC 6946), positioned 37″ west and 105″ south of the galactic core. Discovered by American optician George Willis Ritchey on 19 July 1917, it reached a peak visual magnitude of 13.6. Based on a poor quality photographic spectrum taken at least a month after peak light by F. G. Pease and Ritchey, it was identified as a type II core-collapse supernova.

A 2018 analysis of the surrounding stellar population by B. F. Williams suggests the progenitor star was most likely 13
−1 million years old with 15
−5 times the mass of the Sun (M☉). B. Koplitz and associates in 2021 inferred a progenitor mass estimate of 9.3+16.7
−0.7 M☉. A 2020 search for light echoes from the supernova was unsuccessful.

References

  1. ^ Barbon, R.; et al. (2008), "Asiago Supernova Catalogue", CDS/ADC Collection of Electronic Catalogues, vol. 1, Bibcode:2008yCat....1.2024B.
  2. ^ Frommert, Hartmut; Kronberg, Christine (9 March 2009), "NGC 6946", SEDS, retrieved 2021-12-02.
  3. ^ Williams, Benjamin F.; et al. (June 2018), "Constraints for the Progenitor Masses of Historic Core-collapse Supernovae", The Astrophysical Journal, 860 (1): 10, arXiv:1803.08112, Bibcode:2018ApJ...860...39W, doi:10.3847/1538-4357/aaba7d, S2CID 250890969, 39.
  4. ^ "List of Supernovae", Central Bureau for Astronomical Telegrams, International Astronomical Union, retrieved 2021-12-02.
  5. Baade, W. (October 1938), "The Absolute Photographic Magnitude of Supernovae", Astrophysical Journal, 88: 285, Bibcode:1938ApJ....88..285B, doi:10.1086/143983.
  6. Fesen, Robert A.; Weil, Kathryn E. (February 2020), "Detection of Late-time Optical Emission from SN 1941C in NGC 4136", The Astrophysical Journal, 890 (1): 6, arXiv:1910.07723, Bibcode:2020ApJ...890...15F, doi:10.3847/1538-4357/ab67b7, S2CID 204743687, 15.
  7. Schlegel, E. M. (November 1994), "X-Ray Emission From the Historical Supernovae in the Spiral Galaxy NGC 6946: SN 1980K and 1968D Recovered", Astronomical Journal, 108: 1893, Bibcode:1994AJ....108.1893S, doi:10.1086/117202.
  8. Koplitz, Brad; et al. (July 2021), "The Masses of Supernova Remnant Progenitors in NGC 6946", The Astrophysical Journal, 916 (1): 18, arXiv:2104.11118, Bibcode:2021ApJ...916...58K, doi:10.3847/1538-4357/abfb7b, S2CID 233347129, 58.
  9. Radica, M. C.; et al. (September 2020), "A search for supernova light echoes in NGC 6946 with SITELLE", Monthly Notices of the Royal Astronomical Society, 497 (3): 3297–3305, arXiv:2007.02778, Bibcode:2020MNRAS.497.3297R, doi:10.1093/mnras/staa2006.
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