Astronomy:16 Delphini

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Short description: Star in the constellation Delphinus
16 Delphini
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Delphinus
Right ascension  20h 55m 38.5698s[1]
Declination +12° 34′ 06.8774″[1]
Apparent magnitude (V) 5.54±0.01[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A5 V[4]
U−B color index +0.09[2]
B−V color index +0.11[2]
Astrometry
Radial velocity (Rv)2.0±4.3[5] km/s
Proper motion (μ) RA: +39.558[1] mas/yr
Dec.: +27.772[1] mas/yr
Parallax (π)16.4866 ± 0.06[1] mas
Distance197.8 ± 0.7 ly
(60.7 ± 0.2 pc)
Absolute magnitude (MV)+1.63[6]
Details
Mass2.0±0.1[7] M
Radius1.9±0.1[8] R
Luminosity18.7[6] L
Surface gravity (log g)4.10±0.14[7] cgs
Temperature9,093±309[7] K
Metallicity [Fe/H]−0.01[9] dex
Rotational velocity (v sin i)159[10] km/s
Age400+150−215[7] Myr
Other designations
Database references
SIMBADdata

16 Delphini is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.54,[2] making it faintly visible to the naked eye. The star is relatively close at a distance of 198 light years[1] but is receding with a poorly constrained radial velocity of km/s.[5]

16 Delphini is a chemically peculiar A-type main-sequence star with a stellar classification of A5 V. It has twice the Sun's mass,[7] 1.9 times it's radius,[8] and shines at 18.7 solar luminosity.[6] This yields an effective temperature of 9,039 K,[7] giving it a white glow. 16 Del is 400 million years old[7] – 56.5% through its main sequence lifetime[3] – and spins rapidly with a projected rotational velocity of 159 km/s.[10]

16 Del has a companion that was first discovered by John Herschel and was even noted to be a spectroscopic binary.[11] It is now considered to be a single star. [12]

References

  1. Jump up to: 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. Jump up to: 2.0 2.1 2.2 2.3 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI.". Astronomy and Astrophysics Supplement Series 89: 415. ISSN 0365-0138. Bibcode1991A&AS...89..415O. 
  3. Jump up to: 3.0 3.1 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode2012A&A...537A.120Z. 
  4. Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series 99: 135. doi:10.1086/192182. ISSN 0067-0049. Bibcode1995ApJS...99..135A. 
  5. Jump up to: 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode2006AstL...32..759G. 
  6. Jump up to: 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode2012AstL...38..331A. 
  7. Jump up to: 7.0 7.1 7.2 7.3 7.4 7.5 7.6 David, Trevor J.; Hillenbrand, Lynne A. (12 May 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. ISSN 0004-637X. Bibcode2015ApJ...804..146D. 
  8. Jump up to: 8.0 8.1 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode1999A&A...352..555A. 
  9. Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode2012AstL...38..771G. 
  10. Jump up to: 10.0 10.1 Royer, F.; Zorec, J.; Gómez, A. E. (February 2007). "Rotational velocities of A-type stars: III. Velocity distributions". Astronomy & Astrophysics 463 (2): 671–682. doi:10.1051/0004-6361:20065224. ISSN 0004-6361. Bibcode2007A&A...463..671R. 
  11. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode2001AJ....122.3466M. 
  12. 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. Bibcode2008MNRAS.389..869E.