HD 19275

HD 19275

Location of HD 19275 (circled)
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cassiopeia
Right ascension	03^h 11^m 56.27016^s[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]
Distance	163 ± 1 ly (50.1 ± 0.4 pc)
Absolute magnitude (MV)	1.32[2]
Details
Mass	1.80+0.32 −0.29[4] M☉
Radius	2.7[5] R☉
Luminosity	27.27[2] L☉
Surface gravity (log g)	4.20±0.25[4] cgs
Temperature	8,875±1,000[4] K
Metallicity [Fe/H]	−0.11±0.26[6] dex
Rotational velocity (v sin i)	250[7] km/s
Age	71+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
SIMBAD	data

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]

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) - Third edition -Comments and statistics", Astronomy & Astrophysics, 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.