Astronomy:SN 1917A
| Event type | Supernova |
|---|---|
| Spectral class | Type II[1] |
| Date | 19 July 1917[2] |
| Instrument | G. W. Ritchey[1] |
| Constellation | Cepheus[2] |
| Right ascension | 20h 34m 46.9s[1] |
| Declination | +60° 07′ 29″[1] |
| Distance | 22 Mly (6.8 Mpc)[3] |
| Host | NGC 6946[1] |
| Peak apparent magnitude | 13.60[1] |
| Preceded by | SN 1916A[4] |
| Followed by | SN 1919A[4] |
SN 1917A is a supernova event in the Fireworks Galaxy (NGC 6946),[2] positioned 37″ west and 105″ south of the galactic core.[1] Discovered by American optician George Willis Ritchey on 19 July 1917, it reached a peak visual magnitude of 13.6.[1] Based on a poor quality[5] 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.[6][7]
A 2018 analysis of the surrounding stellar population by B. F. Williams suggests the progenitor star was most likely 13+13−1 million years old with 15+1−5 times the mass of the Sun (M☉).[3] B. Koplitz and associates in 2021 inferred a progenitor mass estimate of 9.3+16.7
−0.7 M☉.[8] A 2020 search for light echoes from the supernova was unsuccessful.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Barbon, R. et al. (2008), "Asiago Supernova Catalogue", CDS/ADC Collection of Electronic Catalogues, Bibcode: 2008yCat....1.2024B.
- ↑ 2.0 2.1 2.2 Frommert, Hartmut; Kronberg, Christine (9 March 2009), "NGC 6946", SEDS, http://messier.seds.org/xtra/ngc/n6946.html, retrieved 2021-12-02.
- ↑ 3.0 3.1 Williams, Benjamin F. et al. (June 2018), "Constraints for the Progenitor Masses of Historic Core-collapse Supernovae", The Astrophysical Journal 860 (1): 10, doi:10.3847/1538-4357/aaba7d, 39, Bibcode: 2018ApJ...860...39W.
- ↑ 4.0 4.1 List of Supernovae, International Astronomical Union, http://www.cbat.eps.harvard.edu/lists/Supernovae.html, retrieved 2021-12-02.
- ↑ Baade, W. (October 1938), "The Absolute Photographic Magnitude of Supernovae", Astrophysical Journal 88: 285, doi:10.1086/143983, Bibcode: 1938ApJ....88..285B.
- ↑ 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, doi:10.3847/1538-4357/ab67b7, 15, Bibcode: 2020ApJ...890...15F.
- ↑ 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, doi:10.1086/117202, Bibcode: 1994AJ....108.1893S, https://cds.cern.ch/record/271442.
- ↑ Koplitz, Brad et al. (July 2021), "The Masses of Supernova Remnant Progenitors in NGC 6946", The Astrophysical Journal 916 (1): 18, doi:10.3847/1538-4357/abfb7b, 58, Bibcode: 2021ApJ...916...58K.
- ↑ 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, doi:10.1093/mnras/staa2006, Bibcode: 2020MNRAS.497.3297R.
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