| 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] |
| Distance | 282 ± 1
ly (86.5 ± 0.4 pc) |
| Absolute magnitude (MV) | +1.44 [6] |
| Details | |
| Mass | 1.61±0.25 [7] M☉ |
| Radius | 3.15±0.11 [7] R☉ |
| Luminosity | 23.9±0.9 [7] L☉ |
| Surface gravity (log g) | 3.65±0.08 [7] cgs |
| Temperature | 7,188±114 [7] K |
| Metallicity [Fe/H] | +0.43±0.20 [8] dex |
| Rotational velocity (v sin i) | 105 [9] km/s |
| Age | 1.02+0.18 −0.16 [10] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
