Theta Pavonis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 18h 48m 37.90451s[1] |
| Declination | −65° 04′ 39.6498″[1] |
| Apparent magnitude (V) | 5.71[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A8V[3] |
| B−V color index | +0.268±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −0.7±4.3[4] km/s |
| Proper motion (μ) | RA: −38.266[1] mas/yr Dec.: −78.246[1] mas/yr |
| Parallax (π) | 15.3252±0.0741 mas [1] |
| Distance | 213 ± 1 ly (65.3 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.56[2] |
| Details | |
| Mass | 1.56[5] M☉ |
| Radius | 2.51+0.09 −0.13[1] R☉ |
| Luminosity | 17.4±0.1[1] L☉ |
| Surface gravity (log g) | 3.94±0.14[5] cgs |
| Temperature | 7,453+199 −136[1] K |
| Metallicity [Fe/H] | +0.01[6] dex |
| Rotational velocity (v sin i) | 245[7] km/s |
| Age | 425[5] Myr |
| Other designations | |
| θ Oct, CPD−65°3754, GC 25706, HD 173168, HIP 92294, HR 7036, SAO 254374[8] | |
| Database references | |
| SIMBAD | data |
θ Pavonis, Latinized as Theta Pavonis, is a single[9] star in the southern constellation of Pavo. It is just visible to the naked eye as a dim, white-hued star, having an apparent visual magnitude of 5.71.[2] This star is located 213 light years from the Sun based on parallax.[1]
This object is an A-type main-sequence star with a stellar classification of A8V,[3] which indicates it is generating energy through hydrogen fusion at its core. It displays little to no detectable X-ray emission, suggesting a weak corona[10] and, at best, a shallow convection zone.[11] Theta Pavonis is 425[5] million years old and is spinning rapidly with a projected rotational velocity of 245 km/s.[7] The star has 1.56[5] times the mass of the Sun and 2.51[1] times the Sun's radius. It is radiating 17.4[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,453 K.[1]
It lies six arc-minutes north of the barred lenticular galaxy NGC 6684.[citation needed ]
References
[edit ]- ^ a b c d e f g h i j k l 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.
- ^ a b c d 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.
- ^ 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 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154 . Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
- ^ Netopil, Martin (August 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883 . Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077 . S2CID 119034918.
- ^ a b Glebocki, R.; Gnacinski, P. (2005). Favata, F.; Hussain, G. A. J.; Battrick, B. (eds.). Catalog of Stellar Rotational Velocities. Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, held 5-9 July, 2004 in Hamburg, Germany. ESA SP-560. European Space Agency. p. 571. Bibcode:2005csss...13..571G. Seq. 31136
- ^ "tet Pav". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019年08月30日.
{{cite web}}: CS1 maint: postscript (link) - ^ 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.
- ^ Simon, Theodore; Drake, Stephen A. (October 1993). "The Coronae of Main-Sequence A Stars". Astronomical Journal. 106: 1660. Bibcode:1993AJ....106.1660S. doi:10.1086/116755 .
- ^ Piters, A. J. M.; van Paradijs, J.; Schmitt, J. H. M. M. (February 1998). "X-ray/optical observations of stars with shallow convection zones (A8-G2 V)". Astronomy and Astrophysics Supplement. 128: 29–33. Bibcode:1998A&AS..128...29P. doi:10.1051/aas:1998126 .