Astronomy:HD 193556

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Short description: G-type star in the constellation Delphinus
HD 193556
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Delphinus
Right ascension  20h 20m 20.5234s[1]
Declination +14° 34′ 09.3206″[1]
Apparent magnitude (V) 6.17±0.01[2]
Characteristics
Spectral type G8 III[3]
U−B color index +0.67[4]
B−V color index +0.92[4]
Astrometry
Radial velocity (Rv)11.7±0.3[5] km/s
Proper motion (μ) RA: −3.887[1] mas/yr
Dec.: +5.610[1] mas/yr
Parallax (π)6.9878 ± 0.0252[1] mas
Distance467 ± 2 ly
(143.1 ± 0.5 pc)
Absolute magnitude (MV)+0.04[6]
Details
Mass2.65[7] M☉
Radius11.33[8] R☉
Luminosity102[9] L☉
Surface gravity (log g)2.76[10] cgs
Temperature5,104[10] K
Metallicity [Fe/H]+0.03[10] dex
Rotational velocity (v sin i)1.5±1.2[11] km/s
Age490[7] Myr
Other designations
BD+14°4263, FK5 3629, GC 28288, HD 193556, HIP 100274, HR 7778, SAO 105988[12]
Database references
SIMBADdata

HD 193556 (HR 7778) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.17,[2] making it visible to the naked eye under ideal conditions. Parallax measurements place the object at a distance of 467 light years[1] and it is currently receding with a heliocentric radial velocity of 11.7 km/s.[5]

HD 193556 has a stellar classification of G8 III,[3] indicating that it is a red giant. It has 2.65 times the mass of the Sun and is currently 490 million years old,[7] having expanded to 11.33 times the radius of the Sun.[8] It shines with a luminosity of 102 solar luminosity[9] from its enlarged photosphere at an effective temperature of 5,104 K,[10] giving it a yellow glow. HD 193556 has an iron abundance around solar level[10] and spins leisurely with a poorly constrained projected rotational velocity of 1.5 km/s.[11]

References

  1. ↑ 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. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Harlan, E. A. (September 1969). "MK classifications for F and G-type stars. I.". The Astronomical Journal 74: 916. doi:10.1086/110881. ISSN 0004-6256. Bibcode: 1969AJ.....74..916H. 
  4. ↑ 4.0 4.1 Fernie, J. D. (May 1983). "New UBVRI photometry for 900 supergiants". The Astrophysical Journal Supplement Series 52: 7. doi:10.1086/190856. ISSN 0067-0049. Bibcode: 1983ApJS...52....7F. 
  5. ↑ 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. Bibcode: 2006AstL...32..759G. 
  6. ↑ 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. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series 178 (1): 89–101. doi:10.1086/589654. ISSN 0067-0049. Bibcode: 2008ApJS..178...89D. 
  8. ↑ 8.0 8.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  9. ↑ 9.0 9.1 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256. Bibcode: 2015AJ....150...88L. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Liu, Y. J.; Tan, K. F.; Wang, L.; Zhao, G.; Sato, Bun'ei; Takeda, Y.; Li, H. N. (31 March 2014). "The Lithium Abundances of a Large Sample of Red Giants". The Astrophysical Journal 785 (2): 94. doi:10.1088/0004-637X/785/2/94. ISSN 0004-637X. Bibcode: 2014ApJ...785...94L. 
  11. ↑ 11.0 11.1 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series 139 (3): 433–460. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  12. ↑ "HD 193556". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+193556. 



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