V603 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 18h 48m 54.6366s |
| Declination | +00° 35′ 02.863″ |
| Apparent magnitude (V) | 11.64 |
| Characteristics | |
| Spectral type | sd:Be+ |
| B−V color index | -0.2 ± 0.5 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | -23 km/s |
| Proper motion (μ) | RA: 10.81 mas/yr Dec.: -8.86 mas/yr |
| Parallax (π) | 4.21 ± 2.59 mas |
| Distance | approx. 800 ly (approx. 200 pc) |
| Absolute magnitude (MV) | 11.65 |
| Details | |
| Radius | 0,72 R☉ |
| Luminosity | -0,14594 L☉ |
| Temperature | 145 K |
| Other designations | |
Nova Aql 1918, Nova Aquilae 1918, EM* CDS 1028, HD 174107, 1RXS J184854.7+003501, ALS 9992, 1ES 1846+00.5, SBC7 706, AN 7.1918, FASTT 1189, HIP 92316, UBV M 51004, CSI+00-18463, GCRV 68659, KPD 1846+0031, 2E 1846.3+0031, LS IV +00 3, 2E 4138, GSC 00448-00423, 2MASS J18485464+0035030, EM* RJHA 116, HBHA 202-05, PLX 4341, AAVSO 1843+00. | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
V603 Aquilae (or Nova Aquilae 1918) was a bright nova occurring in the constellation Aquila in 1918. It is a binary system, comprising a white dwarf and donor low-mass star in close orbit to the point of being only semidetached. The white dwarf sucks matter off its companion, which has filled its Roche lobe,[1] onto its accretion disk and surface until the excess material is blown off in a thermonuclear event.[2] This material then forms an expanding shell, which eventually thins out and disappears.[1]
Discovered on the night of 8 June 1918 by Grace Cook,[3] Nova Aquilae reached a peak magnitude of −0.5; it was the brightest nova recorded in the era of the telescope.[2] It was brighter than all stars bar Sirius and Canopus.[4] Tycho's and Kepler's supernovae were brighter, but both occurred before the invention of the telescope.[5] Originally a star system with a magnitude of 11.43, it took twelve days to fade three magnitudes and then 18.6 years to fade to quiescence.[2] In 1964 Robert P. Kraft ascertained that it was a binary system, recently determined to be true for several other novae at the time.[6]
The star system has settled to an average apparent magnitude of 11.4 since the 1940s, fading by around 1/100 of a magnitude per decade. Spectroscopic analysis conducted by Arenas and colleagues indicated the system consisted of a white dwarf of about 1.2 times as massive as the sun, with an accretion disk, and a companion star with about 20% of the Sun's mass.[7] This second star is most likely a red dwarf.[1] The two stars orbit each other approximately every 3 hours 20 minutes.[7]
References
- 1 2 3 Selvelli, P. L.; Cassatella, A. (1981). "Nova AQL 1918 - A nude old nova". In: Effects of mass loss on stellar evolution; Proceedings of the Fifty-ninth Colloquium, Trieste, Italy, September 15–19, 1980. (A82-33926 16-90) Dordrecht, D. Reidel Publishing Co. Astrophysics and Space Science Library 89: 515–522. Bibcode:1981ASSL...89..515S. doi:10.1007/978-94-009-8500-1_74. ISBN 978-94-009-8502-5.
- 1 2 3 Johnson, Christopher B.; Schaefer, Bradley E.; Kroll , Peter; Henden, Arne A. (2013). "Nova Aquilae 1918 (V603 Aql) Faded by 0.44 mag/century from 1938-2013" (PDF). The Astrophysical Journal 780 (2): L25. arXiv:1310.6802. Bibcode:2014ApJ...780L..25J. doi:10.1088/2041-8205/780/2/L25.
- ↑ Mobberley, Martin (2009). Cataclysmic Cosmic Events and How to Observe Them. Springer. p. 46. ISBN 038779946X.
- ↑ Moore, Patrick (2006). The Amateur Astronomer. Springer. p. 145. ISBN 1846282861.
- ↑ Drechsel, H.; Holm, A.; Krautter, J. & Rahe, J. (1981). "Phase-dependent optical and ultraviolet observations of the old nova V603 Aquilae (1918)". Astronomy & Astrophysics 99 (1): 166–72. Bibcode:1981A&A....99..166D.
- ↑ Kraft, Robert P. (1964). "Binary stars among cataclysmic variables. III. Ten old novae" (PDF). Astrophysical Journal 139: 457–75. Bibcode:1964ApJ...139..457K. doi:10.1086/147776.
- 1 2 Arenas, J.; Catalán, M. S.; Augusteijn, T.; Retter, A. (2000). "A spectroscopic study of V603 Aquilae: stellar parameters and continuum-line variations". Monthly Notices of the Royal Astronomical Society 311 (1): 135–48. Bibcode:2000MNRAS.311..135A. doi:10.1046/j.1365-8711.2000.03061.x.
- Pottasch, Stuart (1959). "The nova outburst: V. The temperature and radius of the central exciting star and observation" (PDF). SAO/NASA Astrophysics Data System (ADS) 22: 416. Bibcode:1959AnAp...22..412P.
- Image V603 Aquilae
External links
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