Astronomy:NU Pavonis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 01m 44.74682s[2] |
| Declination | −59° 22′ 33.1864″[2] |
| Apparent magnitude (V) | 4.95[3] |
| Characteristics | |
| Spectral type | M6 III[4] |
| B−V color index | 1.356±0.011[3] |
| Variable type | SRb[5] |
| Astrometry | |
| Radial velocity (Rv) | −10.3±2.8[6] km/s |
| Proper motion (μ) | RA: +20.385[2] mas/yr Dec.: −26.769[2] mas/yr |
| Parallax (π) | 7.0208 ± 0.4464[2] mas |
| Distance | 460 ± 30 ly (142 ± 9 pc) |
| Absolute magnitude (MV) | −0.86[3] |
| Details | |
| Radius | 204±29[7] R☉ |
| Luminosity | 7,412[3] L☉ |
| Surface gravity (log g) | 0.87[8] cgs |
| Temperature | 3,516±275[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
NU Pavonis is a variable star in the southern constellation of Pavo. With a nominal apparent visual magnitude of 4.95,[3] it is a faint star but visible to the naked eye. The distance to NU Pav, as determined from its annual parallax shift of 7.0 mas[2] as seen from Earth's orbit, is around 460 light years. It is moving closer with a heliocentric radial velocity of −10 km/s.[6]
This is an aging red giant with a stellar classification of M6 III,[4] currently on the asymptotic giant branch. It is a semiregular variable star of sub-type SRb that ranges in magnitude from 4.91 down to 5.26 with a period of 60 days.[7] The star has expanded to 204[7] times the Sun's radius and is radiating 7,412[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,516 K.[7] Far-ultraviolet emission has been detected from these coordinates, which may be coming from a companion star.[8]
References
- ↑ Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (December 2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 6.0 6.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 7.2 7.3 7.4 Arroyo-Torres, B. et al. (June 2014), "VLTI/AMBER observations of cold giant stars: atmospheric structures and fundamental parameters", Astronomy & Astrophysics 566: 11, doi:10.1051/0004-6361/201323264, A88, Bibcode: 2014A&A...566A..88A.
- ↑ 8.0 8.1 Ortiz, Roberto; Guerrero, Martín A. (2016), "Ultraviolet emission from main-sequence companions of AGB stars", Monthly Notices of the Royal Astronomical Society 461 (3): 3036, doi:10.1093/mnras/stw1547, Bibcode: 2016MNRAS.461.3036O.
- ↑ "NU Pav". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NU+Pav.
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