HD 19275

HD 19275 is a single[9] star in the northern constellation of Cassiopeia. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.85.[2] The distance to HD 19275 is 163 light years as determined using parallax measurements.[1] It is drifting further away from the Sun with a radial velocity of around 12 km/s.[2]

HD 19275
Location of HD 19275 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 03h 11m 56.27016s[1]
Declination +74° 23′ 37.1670″[1]
Apparent magnitude (V) 4.85[2]
Characteristics
Spectral type A2Vnn[3]
U−B color index +0.05
B−V color index +0.035±0.006[2]
Astrometry
Radial velocity (Rv)11.9±3.1[2] km/s
Proper motion (μ) RA: +13.895[1] mas/yr
Dec.: −86.650[1] mas/yr
Parallax (π)19.9554 ± 0.1695 mas[1]
Distance163 ± 1 ly
(50.1 ± 0.4 pc)
Absolute magnitude (MV)1.32[2]
Details
Mass1.80+0.32
−0.29[4] M☉
Radius2.7[5] R☉
Luminosity27.27[2] L☉
Surface gravity (log g)4.20±0.25[4] cgs
Temperature8,875±1,000[4] K
Metallicity [Fe/H]−0.11±0.26[6] dex
Rotational velocity (v sin i)250[7] km/s
Age71+317
−60[4] Gyr
Other designations
BD+73°168, FK5 2222, GC 3759, HD 19275, HIP 14862, HR 932, SAO 4840, GSC 04325-01562[8]
Database references
SIMBADdata

This object is an A-type main-sequence star with a stellar classification of A2Vnn.[3] The 'nn' suffix indicates "nebulous" (broad) absorption lines in the spectrum due to rapid rotation. It is spinning with a projected rotational velocity of 250 km/s, which is giving the star an equatorial bulge that is estimated to be 15% larger than the polar radius.[7] The object is an estimated 71[4] million years old with 1.8[4] times the mass of the Sun and about 2.7[5] times the Sun's radius. It is radiating 27[2] times the luminosity of the Sun from its photosphere at an effective temperature of 8,875 K.[4]

References
  1. 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.
  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, S2CID 119257644.
  3. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
  5. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (Third ed.), 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  6. 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.
  7. van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
  8. "HD 19275". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-16.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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