Astronomy:HD 193472
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Short description: Am star in the constellation Delphinus
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Delphinus[1] |
| Right ascension | 20h 20m 00.1887s[2] |
| Declination | +13° 32′ 53.118″[2] |
| Apparent magnitude (V) | 5.94±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | kA4hF0mF[4][5] |
| U−B color index | +0.12[6] |
| B−V color index | +0.28[6] |
| Astrometry | |
| Radial velocity (Rv) | −8.00±1.78[7] km/s |
| Proper motion (μ) | RA: −3.900[2] mas/yr Dec.: −5.007[2] mas/yr |
| Parallax (π) | 11.5644 ± 0.0547[2] mas |
| Distance | 282 ± 1 ly (86.5 ± 0.4 pc) |
| Absolute magnitude (MV) | +1.44[1] |
| Details | |
| Mass | 1.61±0.25[8] M☉ |
| Radius | 3.15±0.11[8] R☉ |
| Luminosity | 23.9±0.9[8] L☉ |
| Surface gravity (log g) | 3.65±0.08[8] cgs |
| Temperature | 7,188±114[8] K |
| Metallicity [Fe/H] | +0.43±0.20[9] dex |
| Rotational velocity (v sin i) | 105[10] km/s |
| Age | 1.02+0.18 −0.16[11] 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,[3] making it visible with the naked eye if viewed under ideal conditions. Parallax measurements put it at a distance of 282 light years[2] and has a radial velocity of −8 km/s,[7] indicating that the object drifting towards the Solar System.
HD 193472 has a stellar classification of kA4hF0mF, 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[12] 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.[10]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 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.
- ↑ 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. Bibcode: 1995ApJS...99..135A.
- ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- )". Vizier Online Data Catalog. Bibcode: 2014yCat....1.2023S.
- ↑ 6.0 6.1 Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978). "UBVRI photometry of 225 AM stars". The Astronomical Journal 83: 606. doi:10.1086/112242. ISSN 0004-6256. Bibcode: 1978AJ.....83..606M.
- ↑ 7.0 7.1 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. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K.
- ↑ 8.0 8.1 8.2 8.3 8.4 Stassun, Keivan G. et al. (2019-10-01). "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.
- ↑ Gáspár, András et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal 826 (2): 171. doi:10.3847/0004-637X/826/2/171. Bibcode: 2016ApJ...826..171G.
- ↑ 10.0 10.1 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. doi:10.1051/0004-6361:20020943. ISSN 0004-6361. Bibcode: 2002A&A...393..897R.
- ↑ Kunzli, M.; North, P. (1998). "Behaviour of calcium abundance in Am-Fm stars with evolution". Astronomy and Astrophysics 330: 651. Bibcode: 1998A&A...330..651K.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
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