HD 193556

Last updated
HD 193556
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus [1]
Right ascension 20h 20m 20.5234s [2]
Declination +14° 34′ 09.321″ [2]
Apparent magnitude  (V)6.17±0.01 [3]
Characteristics
Spectral type G8 III [4]
U−B color index +0.67 [5]
B−V color index +0.92 [5]
Astrometry
Radial velocity (Rv)11.7±0.3 [6] km/s
Proper motion (μ)RA: −3.887 mas/yr [2]
Dec.: +5.610 mas/yr [2]
Parallax (π)6.9878±0.0252  mas [2]
Distance 467 ± 2  ly
(143.1 ± 0.5  pc)
Absolute magnitude  (MV)+0.04 [1]
Details
Mass 2.65 [7]   M☉
Radius 11.33 [8]   R☉
Luminosity 102 [9]   L☉
Surface gravity (log g)2.76 [10]   cgs
Temperature 5,104 [10]   K
Metallicity [Fe/H]+0.03 [10]   dex
Rotational velocity (v sin i)1.5±1.2 [11]  km/s
Age 490 [7]   Myr
Other designations
AG+14°2187, BD+14°4263, FK5 3629, GC 28288, HD 193556, HIP 100274, HR 7778, SAO 105988 [12]
Database references
SIMBAD data

HD 193556 (HR 7778) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.17, [3] making it visible to the naked eye under ideal conditions. Parallax measurements place the object at a distance of 467 light years [2] and it is currently receding with a heliocentric radial velocity of 11.7  km/s . [6]

HD 193556 has a stellar classification of G8 III, [4] 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  L☉ [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 2 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  4. 1 2 Harlan, E. A. (September 1969). "MK classifications for F and G-type stars. I." The Astronomical Journal. 74: 916. Bibcode:1969AJ.....74..916H. doi: 10.1086/110881 . ISSN   0004-6256.
  5. 1 2 Fernie, J. D. (May 1983). "New UBVRI photometry for 900 supergiants". The Astrophysical Journal Supplement Series. 52: 7. Bibcode:1983ApJS...52....7F. doi: 10.1086/190856 . eISSN   1538-4365. ISSN   0067-0049.
  6. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN   1063-7737. S2CID   119231169.
  7. 1 2 3 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. arXiv: 0804.4473 . Bibcode:2008ApJS..178...89D. doi: 10.1086/589654 . eISSN   1538-4365. ISSN   0067-0049.
  8. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . ISSN   0004-6256.
  9. 1 2 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv: 1507.01466 . Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN   1538-3881. ISSN   0004-6256. S2CID   118505114.
  10. 1 2 3 4 5 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. arXiv: 1404.1687 . Bibcode:2014ApJ...785...94L. doi: 10.1088/0004-637X/785/2/94 . eISSN   1538-4357. ISSN   0004-637X.
  11. 1 2 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. Bibcode:1999A&AS..139..433D. doi: 10.1051/aas:1999401 . ISSN   0365-0138.
  12. ↑ "HD 193556". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 20, 2022.
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