V705 Cassiopeiae
Location of V705 Cassiopeiae (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 41m 47.19s[1]
Declination 57° 30′ 59.5″[1]
Apparent magnitude (V) 5.3[2] - 16.4[3]
Characteristics
Variable type Nova
Astrometry
Distance2157+799
−228[3] pc
Other designations
V705 Cas, Nova Cassiopeiae 1993, AAVSO 2337+56[4]
Database references
SIMBADdata
The light curve of V705 Cassiopeiae, plotted from AAVSO data

V705 Cassiopeiae, also known as Nova Cassiopeiae 1993 was a nova which erupted in the constellation Cassiopeia during 1993. The nova was discovered at 11:17 UT on 7 December 1993 by amateur astronomer Kazuyoshi Kanatsu of Matsue, Japan, who photographed it using a 35mm camera with a 55mm f/2.8 lens.[5][6] Asteroid 6976 Kanatsu was named after him in honor of this discovery.[7] At the time of its discovery the nova had a photographic magnitude of 6.5. Around December 18, 1993, it flared briefly to magnitude 5.3 (making it visible to the naked eye), and then it returned rapidly to magnitude 6.5. It underwent a series of smaller flares until mid February 1993, after which it began a precipitous decline in brightness.[2]

The light curve of V705 Cassiopeiae showed a very pronounced "dust dip", and its brightness fell to about 16th magnitude in mid March 1994, before rebounding to about magnitude 12.5 where it stayed for about two years, after which it declined further. This dust dip occurs when dust forms as the material ejected in the nova explosion expands and cools.[8] The nova ultimately faded to a quiescent magnitude of 16.4.[3]

All novae are binary stars, with a "donor" star orbiting a white dwarf. The two stars are so close to each other that material is passed from the donor star to the white dwarf. The orbital period for the binary that forms V705 Cassiopeiae is 5.472 hours.[9] The white dwarf is estimated to have a mass of 1.05 M☉ and to be receiving 2×10−9 M☉ per year of material from the donor star.[10]

References

  1. ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  2. ^ a b Starrfield, S.; Hauschildt, P.H.; Shore, S.N.; Gonzalez-Riestra, R.; Sonneborn, G.; Allard, F. (1995). Cataclysmic Variables. Astrophysics and Space Science Library, vol 205. Dordrecht: Springer. pp. 267–275. ISBN 978-94-011-0335-0.
  3. ^ a b c Schaefer, Bradley E. (December 2018). "The distances to Novae as seen by Gaia". Monthly Notices of the Royal Astronomical Society. 481 (3): 3033–3051. arXiv:1809.00180. Bibcode:2018MNRAS.481.3033S. doi:10.1093/mnras/sty2388. S2CID 118925493.
  4. ^ "V705 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 December 2020.
  5. ^ Nakano, S.; Kanatsu, K.; Kawanishi, K.; Tago, A.; Otomo, S.; Urata, T.; Tomita, K. (December 1993). "Nova Cassiopeiae 1993". IAU Circular. 5902: 1. Bibcode:1993IAUC.5902....1N.
  6. ^ "Alert Notice PEP #00: Special Alert Notice to AAVSO Photoelectric Observers [2337+56 Nova Cassiopeiae 1993] [V705 Cas]". aavso.org. AAVSO. Retrieved 16 December 2020.
  7. ^ "6976 Kanatsu (1993 KD2)". Solar System Dynamics. NASA/JPL. Retrieved 16 December 2020.
  8. ^ Shore, S.N.; Starrfield, S.; Gonzalez-Riestrat, R.; Hauschildt, P.H.; Sonneborn, G. (June 1994). "Dust formation in Nova Cassiopeiae 1993 seen by ultraviolet absorption". Nature. 369 (6481): 539–541. Bibcode:1994Natur.369..539S. doi:10.1038/369539a0. S2CID 4355149.
  9. ^ Diaz, M.P.; Bruch, A. (June 1997). "The orbital period distribution of novae". Astronomy and Astrophysics. 322: 807–816. Bibcode:1997A&A...322..807D.
  10. ^ Shara, Michael M.; Prialnik, Dina; Hillman, Yael; Kovetz, Attay (June 2018). "The Masses and Accretion Rates of White Dwarfs in Classical and Recurrent Novae". The Astrophysical Journal. 860 (2): 110. arXiv:1804.06880. Bibcode:2018ApJ...860..110S. doi:10.3847/1538-4357/aabfbd. S2CID 55851634.
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