Rho Pavonis

Rho Pavonis, Latinized from ρ Pavonis, is a single,[10] variable star in the southern constellation of Pavo. It is yellow-white in hue and faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.86.[2] The star is located at a distance of approximately 190 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +8 km/s.[2] It is a candidate outlying member of the Tucana Association of co-moving stars.[11]

A light curve for Rho Pavonis, plotted from TESS data[12]
Rho Pavonis
Location of ρ Pavonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pavo
Right ascension 20h 37m 35.31275s[1]
Declination −61° 31′ 47.7145″[1]
Apparent magnitude (V) 4.86[2] (4.85 – 4.91)[3]
Characteristics
Spectral type Fm δ Del[4]
U−B color index +0.19[3]
B−V color index +0.43[3]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)+8.0±0.8[2] km/s
Proper motion (μ) RA: +59.61[1] mas/yr
Dec.: −72.69[1] mas/yr
Parallax (π)17.20 ± 0.24 mas[1]
Distance190 ± 3 ly
(58.1 ± 0.8 pc)
Absolute magnitude (MV)1.04[6]
Details
Radius4.33+0.39
−0.17[7] R☉
Luminosity34.1±0.8[7] L☉
Temperature6,704+136
−285[7] K
Rotational velocity (v sin i)45.0[8] km/s
Other designations
ρ Pav, CPD−61°6495, FK5 3647, GC 28668, HD 195961, HIP 101773, HR 7859, SAO 254835[9]
Database references
SIMBADdata

This is a metallic-line star with a stellar classification of Fm δ Del,[4] where the suffix notation indicating it is a δ Delphini star. It is a Delta Scuti variable, varying in brightness by 0.03 magnitudes.[13] The dominant pulsation period is 2.74 hours, but the effects of other pulsation periods are apparent in the light curve.[14] The star has 4.3[7] times the girth of the Sun and is spinning with a projected rotational velocity of 45 km/s.[8] It is radiating 34[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,704 K.[7]

References
  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 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.
  3. Garcia, J. R.; Cebral, J. R.; Scoccimarro, E. R.; Wahnon, P.; Arena, R.; Bazterra, V.; Pellizza, L.; Risi, A.; Rodriguez, M. L.; Zimmermann, M. (1995). "A catalogue of variable stars in the lower instability strip". Astronomy and Astrophysics Supplement. 109: 201. Bibcode:1995A&AS..109..201G.
  4. Houk, N.; Cowley, A. P. (1975), Michigan catalogue of two-dimensional spectral types for the HD stars. Declinations -90_ to -53_ƒ0, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H
  5. Samus, N. N.; Durlevich, O. V.; et al. (2009). "General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-Line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
  7. 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. Gaia DR2 record for this source at VizieR.
  8. Głȩbocki, R.; Gnaciński, P. (March 2005), "Catalog of Stellar Rotational Velocities", VizieR On-Line Data Catalog: III/244. Originally Published in: Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, 3244, Bibcode:2005yCat.3244....0G Vizier catalog entry
  9. "rho Pav". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-16.
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  11. Zuckerman, B.; et al. (September 2001). "Tucana Association". The Astrophysical Journal. 559 (1): 388–394. Bibcode:2001ApJ...559..388Z. doi:10.1086/322305.
  12. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  13. Rodríguez, E.; et al. (June 2000). "A revised catalogue of delta Sct stars". Astronomy and Astrophysics Supplement. 144 (3): 469–474. Bibcode:2000A&AS..144..469R. doi:10.1051/aas:2000221.
  14. Kurtz, D. W. (March 1981). "The δ Scuti variability of the high metallicity δ Del star, rho Pavonis". Monthly Notices of the Royal Astronomical Society. 194: 737–746. doi:10.1093/mnras/194.3.737.
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