Astronomy:Theta Pavonis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| 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
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 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. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 5.2 5.3 5.4 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.
- ↑ 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. doi:10.1093/mnras/stx1077. Bibcode: 2017MNRAS.469.3042N.
- ↑ 7.0 7.1 Glebocki, R.; Gnacinski, P. (2005). "Catalog of Stellar Rotational Velocities". in Favata, F.; Hussain, G. A. J.; Battrick, B.. Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, held 5-9 July, 2004 in Hamburg, Germany. European Space Agency. p. 571. Bibcode: 2005csss...13..571G. Seq. 31136
- ↑ "tet Pav". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tet+Pav.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Simon, Theodore; Drake, Stephen A. (October 1993). "The Coronae of Main-Sequence A Stars". Astronomical Journal 106: 1660. doi:10.1086/116755. Bibcode: 1993AJ....106.1660S.
- ↑ 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. doi:10.1051/aas:1998126. Bibcode: 1998A&AS..128...29P.
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