Delta Phoenicis
Star in the constellation Phoenix
Delta Phoenicis , Latinized from δ Phoenicis, is a single,[9] yellow-hued star in the southern constellation of Phoenix . With an apparent visual magnitude of 3.93,[2] it is visible to the naked eye. Based upon an annual parallax shift of 22.95 mas as seen from Earth,[1] it is located 142 light years from the Sun . The star is moving closer to the Sun with a radial velocity of −7 km/s.[4]
This is a G-type giant star with a stellar classification of G8.5 IIIb.[2] It is a red clump star, which means it has reached the stage of its evolution where it is generating energy through helium fusion at its core .[7] The measured angular diameter of this star, after correction for limb darkening , is 2.24± 0.02 mas .[10] At its estimated distance, this yields a physical size of about 10.5 times the radius of the Sun .[6] It is around 3.7[5] billion years old with 1.46[5] times the mass of the Sun . The star is radiating 60[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,762 K.[5]
References
^ a b c d e f 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
^ a b c d e f g 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 . Vizier catalog entry
^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers . 42 (2): 443. Bibcode :2014JAVSO..42..443M . Vizier catalog entry
^ a b Gontcharov, G. A. (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 .
^ a b c d e f Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal . 150 (3). 88. arXiv :1507.01466 . Bibcode :2015AJ....150...88L . doi :10.1088/0004-6256/150/3/88 . S2CID 118505114 .
^ a b Lang, Kenneth R. (2006), Astrophysical formulae , Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser , ISBN 978-3-540-29692-8 . The radius (R* ) is given by:
2
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2.24
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0.0046491
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21
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{\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(43.6\cdot 2.24\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 21\cdot R_{\bigodot }\end{aligned}}}
^ a b c Liu, Y. J.; Zhao, G.; Shi, J. R.; Pietrzynski, G.; Gieren, W. (2007). "The abundances of nearby red clump giants" . Monthly Notices of the Royal Astronomical Society . 382 (2): 553. Bibcode :2007MNRAS.382..553L . doi :10.1111/j.1365-2966.2007.11852.x .
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics . 561 : A126. arXiv :1312.3474 . Bibcode :2014A&A...561A.126D . doi :10.1051/0004-6361/201220762 . S2CID 54046583 . Vizier catalog entry
^ 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 .
^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics , 431 (2): 773–777, Bibcode :2005A&A...431..773R , doi :10.1051/0004-6361:20042039 .