NU Pavonis

Red giant star in the constellation Pavo

NU Pavonis
Observation data Epoch J2000 Equinox J2000
A visual band light curve for NU Pavonis, plotted from data published by Tabur et al. (2009)^[1]
Constellation	Pavo
Right ascension	20^h 01^m 44.74682^s^[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 (R_v)	−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 mas^[2]
Distance	460 ± 30 ly (142 ± 9 pc)
Absolute magnitude (M_V)	−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
NU Pav, CD−59° 7361, FK5 3598, HD 189124, HIP 98608, HR 7625, SAO 246389^[9]
Database references
SIMBAD	data

NU Pavonis (N-U, not "nu") 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. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x.
^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
^ ^a ^b ^c ^d ^e ^f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
^ ^a ^b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 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. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
^ ^a ^b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
^ ^a ^b ^c ^d ^e Arroyo-Torres, B.; et al. (June 2014), "VLTI/AMBER observations of cold giant stars: atmospheric structures and fundamental parameters", Astronomy & Astrophysics, 566: 11, arXiv:1404.7384, Bibcode:2014A&A...566A..88A, doi:10.1051/0004-6361/201323264, S2CID 16778588, A88.
^ ^a ^b 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, arXiv:1606.09086, Bibcode:2016MNRAS.461.3036O, doi:10.1093/mnras/stw1547, S2CID 118619933.
^ "NU Pav". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 September 2018.

Constellation of Pavo

Stars

Bayer	α (Peacock) β γ δ ε ζ η θ ι κ λ μ¹ μ² ν ξ ο π ρ σ τ υ φ¹ φ² ω
Variable	R V X Y SX AR BD KZ MW NU NZ V346 V347
HR	6586 6624 6634 6740 6760 6796 6805 6808 6828 6899 6908 6939 6996 7004 7012 7015 7022 7027 7111 7130 7161 7221 7278 7320 7383 7434 7435 7455 7498 7513 7527 7531 7558 7579 7587 7588 7644 7663 7691 7707 7732 7838 7872 7959 8019 8061 8073 8081 8125 8159
HD	161475 162521 164427 175007 175167 176522 179419 181433 186302 190984 192887 195190 195772 196050
Other	Gliese 693 SCR 1845−6357 SCR 1826−6542