V4332 Sagittarii
 A visual band light curve for V4332 Sagittarii. The main plot, adapted from Tylenda et al. (2015),[1] shows the long-term variability, and the inset, adapted from Martini et al. (1999),[2] shows the variation during the first weeks of the eruption. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 50m 36.696s[3] |
| Declination | –21° 23′ 28.93″[3] |
| Apparent magnitude (V) | 8.5[2] |
| Characteristics | |
| Spectral type | K8/M0e[4] |
| Other designations | |
V4332 Sgr, Nova Sgr 1994[6] | |
| Database references | |
| SIMBAD | data |
V4332 Sagittarii is a
M-type star.[9]
The nova-like event V838 Mon and this outburst formed an unusual category of erupting stars. In 2003, N. Soker and R. Tylenda proposed an accretion scenario as an explanation. They noted that a merger of two main sequence stars in a close binary orbit could explain the observed properties,[10] a process now known as a luminous red nova. In this scenario, the decline in brightness and radius of V4332 Sgr was a consequence of the merged stellar envelope undergoing gravitational contraction.[9]
An infrared excess from the object suggests it has a circumstellar disk. The infrared spectrum of this feature showed an
See also
References
- ^ S2CID 54789582, A75.
- ^ S2CID 13862209.
- ^ .
- S2CID 118936262.
- .
- ^ "V4332 Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-05.
{{cite web}}: CS1 maint: postscript (link) - Bibcode:1994IAUC.5942....1H.
- Bibcode:1994IAUC.5944....1W.
- ^ S2CID 119410176.
- S2CID 18351411.
- )
Further reading
- Goranskij, V. P.; et al. (June 2018), "Rapid re-brightening of the red nova V4332 Sgr remnant", The Astronomer's Telegram, 11733 (11733): 1, Bibcode:2018ATel11733....1G.
- Kamiński, T.; Tylenda, R. (October 2013), "Optical spectropolarimetry of V4332 Sagittarii", Astronomy & Astrophysics, 558: 7, S2CID 119273390, A82.
- Kamiński, T.; Tylenda, R. (March 2011), "Strong linear polarization of V4332 Sagittarii: a dusty disc geometry", Astronomy & Astrophysics, 527: 3, S2CID 55219492, A75.
- Kamiński, T.; et al. (November 2010), "V4332 Sagittarii: a circumstellar disc obscuring the main object", Astronomy and Astrophysics, 522: 12, S2CID 55759155, A75.
- Banerjee, D. P. K.; et al. (September 2007), "Spitzer Observations of V4332 Sagittarii: Detection of Alumina Dust", The Astrophysical Journal, 666 (1): L25–L28, S2CID 7492121.
- Goranskij, V.; et al. (August 2006), "Unexpected change in the spectrum of V4332 Sgr", The Astronomer's Telegram, 876 (876): 1, Bibcode:2006ATel..876....1G.
- Lynch, D. K.; et al. (August 2006), Green, D. W. E. (ed.), "V4332 Sagittarii", IAU Circular, 8739 (1): 1, Bibcode:2006IAUC.8739....1L.
- Banerjee, Dipankar P. K. (June 2005), "Studies of the peculiar nova V4332 Sgr", Bulletin of the Astronomical Society of India, 33 (2): 81, Bibcode:2005BASI...33...81B.
- Banerjee, Dipankar P. K.; et al. (November 2004), "L and M Band Infrared Studies of V4332 Sagittarii: Detection of the Water Ice Absorption Band at 3.05 μm and the CO Fundamental Band in Emission", The Astrophysical Journal, 615 (1): L53–L56, S2CID 119099260.
- Banerjee, Dipankar P. K.; et al. (July 2004), "A Search for Radioactive 26Al in the Nova-like Variable V4332 Sagittarii", The Astrophysical Journal, 610 (1): L29–L32, S2CID 119073232.
- Banerjee, Dipankar P. K.; Ashok, Nagarhalli M. (March 2004), "Optical Studies of V4332 Sagittarii: Detection of Unusually Strong K I and Na I Lines in Emission", The Astrophysical Journal, 604 (1): L57–L60, S2CID 119424917.
- Banerjee, Dipankar P. K.; et al. (November 2003), "Remarkable Changes in the Near-Infrared Spectrum of the Nova-like Variable V4332 Sagittarii", The Astrophysical Journal, 598 (1): L31–L34, S2CID 123386138.
