Astronomy:HD 19275
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Gullikson, Kevin et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 40, doi:10.3847/0004-6256/152/2/40, Bibcode: 2016AJ....152...40G.
- ↑ 5.0 5.1 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, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 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.
- ↑ 7.0 7.1 van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
- ↑ "HD 19275". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+19275.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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