HD 193472

HD 193472
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 20m 00.1887s[1]
Declination +13° 32′ 53.1186″[1]
Apparent magnitude (V) 5.94±0.01[2]
Characteristics
Spectral type kA4 hF0 mF2[3]
U−B color index +0.12[4]
B−V color index +0.28[4]
Astrometry
Radial velocity (Rv)−8.00±1.78[5] km/s
Proper motion (μ) RA: −3.900 mas/yr[1]
Dec.: −5.007 mas/yr[1]
Parallax (π)11.5644 ± 0.0547 mas[1]
Distance282 ± 1 ly
(86.5 ± 0.4 pc)
Absolute magnitude (MV)+1.44[6]
Details
Mass1.61±0.25[7] M☉
Radius3.15±0.11[7] R☉
Luminosity23.9±0.9[7] L☉
Surface gravity (log g)3.65±0.08[7] cgs
Temperature7,188±114[7] K
Metallicity [Fe/H]+0.43±0.20[8] dex
Rotational velocity (v sin i)105[9] km/s
Age1.02+0.18
−0.16[10] Gyr
Other designations
AG+13°2095, BD+13°4360, GC 28275, HD 193472, HIP 100256, HR 7774, SAO 105974
Database references
SIMBADdata

HD 193472 (HR 7774) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.94,[2] making it visible with the naked eye if viewed under ideal conditions. Parallax measurements put it at a distance of 282 light years[1] and has a radial velocity of −8 km/s,[5] indicating that the object drifting towards the Solar System.

HD 193472 has a stellar classification of kA4 hF0 mF2,[3] indicating that its an Am star with the calcium K-line of an A4 star, the hydrogen lines and effective temperature of a F0 star, and the metallic lines of a F2 star. Due to a radius over three times that of the Sun and a relatively low surface gravity, it appears to be slightly evolved. HD 193472 has 161% the mass of the Sun and shines at 24 times the luminosity of the Sun[11] from its photosphere at an effective temperature of 7,188 K, giving it a yellowish white glow. HD 193472 has a projected rotational velocity of 105 km/s.[9]

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b 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.
  3. ^ a b 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. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049.
  4. ^ a b Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978). "UBVRI photometry of 225 AM stars". The Astronomical Journal. 83: 606. Bibcode:1978AJ.....83..606M. doi:10.1086/112242. ISSN 0004-6256.
  5. ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337.
  6. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 255204555.
  7. ^ a b c d e Stassun, Keivan G.; et al. (2019-10-01). "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. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
  8. ^ Gáspár, András; et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv:1604.07403. Bibcode:2016ApJ...826..171G. doi:10.3847/0004-637X/826/2/171. S2CID 119241004.
  9. ^ a b Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (October 2002). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 393 (3): 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. eISSN 1432-0746. ISSN 0004-6361.
  10. ^ Kunzli, M.; North, P. (1998). "Behaviour of calcium abundance in Am-Fm stars with evolution". Astronomy and Astrophysics. 330: 651. arXiv:astro-ph/9710223. Bibcode:1998A&A...330..651K.
  11. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.