NU Pavonis

NU Pavonis
Location of NU Pavonis (circled)
Observation data
Epoch J2000      Equinox ICRS
Constellation Pavo
Right ascension 20h 01m 44.74541s
Declination −59° 22′ 33.2173″
Apparent magnitude (V) 4.91 – 5.26
Characteristics
Evolutionary stage AGB
Spectral type M6 III
B−V color index 1.356±0.011
Variable type SRb
Astrometry
Radial velocity (Rv)−10.3±2.8 km/s
Proper motion (μ) RA: +20.22 mas/yr
Dec.: −27.05 mas/yr
Parallax (π)6.86±0.26 mas
Distance480 ± 20 ly
(146 ± 6 pc)
Absolute magnitude (MV)−0.86
Details
Mass3.7 M☉
Radius204±29 R☉
Luminosity5,720±960 L☉
Surface gravity (log g)0.87 cgs
Temperature3,516±275 K
Metallicity [Fe/H]−0.28 dex
Other designations
NU Pav, CD−59°7361, FK5 3598, HD 189124, HIP 98608, HR 7625, SAO 246389
Database references
SIMBADdata

NU Pavonis (N-U, not "nu") is a variable star in the southern constellation of Pavo. With an apparent visual magnitude of about 5, it is a faint star but visible to the naked eye. The distance to NU Pav, as determined from its annual parallax shift of 6.9 mas as seen from Earth's orbit, is around 480 light years. It is moving closer with a heliocentric radial velocity of −10 km/s.

It was designated Lambda2 Indi (λ2 Ind) by Nicolas Louis de Lacaille before its designation was dropped.

A visual band light curve for NU Pavonis, plotted from data published by Tabur et al. (2009)

This is an aging red giant with a stellar classification of M6 III, currently on the asymptotic giant branch. Peter M. Corben listed HR 7625 as a possible variable star in 1971. It was given its variable star designation, NU Pavonis, in 1973. 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. The star has expanded to 204 times the Sun's radius and is radiating 7,412 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,516 K.

Far-ultraviolet emission has been detected from the position of this star, which may be coming from a companion star.

References

  1. 1 2 3 4 5 6 7 8 9 10 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. XHIP record for this object at VizieR.
  2. 1 2 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.
  3. ↑ Eggen, Olin J. (July 1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  7. 1 2 3 4 5 6 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.
  8. 1 2 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.
  9. ↑ "NU Pav". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 September 2018.
  10. ↑ Morton Wagman (2003). Lost Stars: Lost, Missing, and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas-Louis de Lacaille, John Flamsteed, and Sundry Others (2 ed.). McDonald & Woodward Publishing Company. ISBN 978-0-939923-78-6. OCLC 1131243914.
  11. ↑ 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.
  12. ↑ Corben, P. M. (1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astron. Soc. Southern Africa. 30: 37–50. Bibcode:1971MNSSA..30...37C.
  13. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 834: 1–22. Bibcode:1973IBVS..834....1K. Retrieved 14 December 2024.