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Not to be confused with Nu (𝜈) Pavonis.

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[1] as seen from Earth’s orbit, is around 480 light years. It is moving closer with a heliocentric radial velocity of −10 km/s.[5]

It was designated Lambda2 Indi (λ2 Ind) by Nicolas Louis de Lacaille before its designation was dropped.[10]

A visual band light curve for NU Pavonis, plotted from data published by Tabur et al. (2009)[11]

This is an aging red giant with a stellar classification of M6 III,[4] currently on the asymptotic giant branch. Peter M. Corben listed HR 7625 as a possible variable star in 1971.[12] It was given its variable star designation, NU Pavonis, in 1973.[13] 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 times the Sun’s radius[7] and is radiating 7,412 times the Sun’s luminosity from its enlarged photosphere[1] at an effective temperature of 3,516 K.[7]

Far-ultraviolet emission has been detected from the position of this star, which may be coming from a companion star.[8]

References

  1. ^ a b c d e f g h i j 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. ^ a b 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. ^ 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.
  5. ^ 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.
  6. ^ a b 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-GonzĂĄlez, M.; Malhotra, S.; JimĂ©nez-Arranz, Ó.; Enke, H.; Casamiquela, L.; ArdĂšvol, 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. ^ a b c d e f 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. ^ a b Ortiz, Roberto; Guerrero, MartĂ­n 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 donnĂ©es 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.