KIC 9832227
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 29m 15.948s[1] |
| Declination | +46° 37′ 19.89″[1] |
| Apparent magnitude (V) | 12.27 - 12.46[2] |
| Astrometry | |
| Distance | 1843 ly (565[3] pc) |
| Orbit[3] | |
| Period (P) | 0.45796151 days |
| Semi-major axis (a) | 2.992 R☉ |
| Inclination (i) | 53.2° |
| Periastron epoch (T) | 2455688.49913 |
| Details[3] | |
| A | |
| Mass | 1.395 M☉ |
| Radius | 1.581 R☉ |
| Luminosity | 2.609 L☉ |
| Surface gravity (log g) | 4.19 cgs |
| Temperature | 5800 K |
| Rotational velocity (v sin i) | 149.7 km/s |
| B | |
| Mass | 0.318 M☉ |
| Radius | 0.830 R☉ |
| Luminosity | 0.789 L☉ |
| Surface gravity (log g) | 4.10 cgs |
| Temperature | 5920 K |
| Rotational velocity (v sin i) | 84.7 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
KIC 9832227 is a contact binary[4] star system in the constellation of Cygnus, located about 1800 light-years away.[5] It is also identified as an eclipsing binary with a periodicity of almost 11 hours.[4] The system is predicted to result in a merger in 2022.2 +/- 0.6, producing a luminous red nova reaching magnitude 2.[5] The luminous red nova should remain visible to the naked eye for up to 6 months.
The period of the variations in KIC 9832227 has been observed to be growing shorter since 2013. It is expected that the period will continue to get smaller at an ever increasing rate, and end in the merging of the two cores. This will release a very large amount of energy, a process which occurred before in the system V1309 Scorpii, which went nova in 2008, and was later found by a team led by Romuald Tylenda to have been the result of a stellar merger. However, astronomers in Tylenda's team have questioned the reliability of the KIC 9832227 prediction, because it is based on a model that may not be accurate enough to predict the outburst time so precisely.[6] The physical mechanism or mechanisms driving such stellar mergers is still not understood, and is the main focus of those researching KIC 9832227.
See also
References
- ^ a b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
- ^ "ASAS J192916+4637.3". AAVSO. Retrieved 7 January 2017.
- ^ a b c Molnar, Lawrence A.; Van Noord, Daniel M.; Steenwyk, Steven D.; Spedden, Chris J.; Kinemuchi, Karen (2015). "A prediction of a luminous red nova eruption" (PDF). American Astronomical Society (225). Bibcode:2015AAS...22541505M. Archived from the original (PDF) on 7 January 2017.
- ^ a b Kinemuchi, Karen (2013-10-01). "To Pulsate or to Eclipse? Status of KIC 9832227 Variable Star". arXiv:1310.0544.
{{cite journal}}: Cite journal requires|journal=(help) - ^ a b Molnar, Lawrence A.; Van Noord, Daniel; Kinemuchi, Karen; Smolinski, Jason P.; Alexander, Cara E.; Kobulnicky, Henry A.; Cook, Evan M.; Jang, Byoungchan; Steenwyk, Steven D. (2017). "KIC 9832227: A red nova precursor". American Astronomical Society. 229: 417.04. Bibcode:2017AAS...22941704M.
- ^ Carlisle, Camille (6 January 2017). "Paired Stars in Cygnus En Route to Merger". Sky and Telescope. Retrieved 12 January 2017.
External links
- Molnar, Lawrence; et al. "Prediction of a Red Nova Outburst in KIC 9832227" (PDF). Calvin College. Calvin College Group. Retrieved 8 January 2017.
{{cite web}}: Explicit use of et al. in:|last1=(help) - Knapton, Sarah. "Spectacular collision of suns will create new star in night sky in 2022". The Daily Telegraph. Telegraph Media Group. Retrieved 7 January 2017.
- Byrd, Deborah. "Star predicted to explode in 2022". EarthSky. EarthSky Communications. Retrieved 7 January 2017.
- Masi, Gianluca. "Star merging in KIC 9832227: a possible once-in-a-lifetime event". Virtual Telescope Project. Virtual Telescope Project. Retrieved 11 January 2017.
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