HR 297

HR 297 is a solitary star in the northern circumpolar constellation of Cassiopeia. It has an apparent visual magnitude of 5.8,[2] making it faintly visible to the naked eye from dark suburban skies. Parallax measurements put this system at a distance of roughly 256 light years.[1] It is drifting closer with a heliocentric radial velocity of −20.4 km/s.[4]

HR 297
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 01h 04m 19.451s[1]
Declination +61° 34′ 48.66″[1]
Apparent magnitude (V) 5.84[2]
Characteristics
Evolutionary stage Main sequence
Spectral type F6V[3]
U−B color index +0.11[2]
B−V color index +0.56[2]
Astrometry
Radial velocity (Rv)−20.40[4] km/s
Proper motion (μ) RA: −79.837 mas/yr[1]
Dec.: −24.915 mas/yr[1]
Parallax (π)12.7218 ± 0.0301 mas[1]
Distance256.4 ± 0.6 ly
(78.6 ± 0.2 pc)
Absolute magnitude (MV)1.30[5]
Details
Mass1.953[3] M☉
Radius4.52±0.15[3] R☉
Luminosity25.16±1.59[3] L☉
Surface gravity (log g)3.86[6] cgs
Temperature6,089±35[3] K
Metallicity [Fe/H]−0.01[3] dex
Rotational velocity (v sin i)42.0[7] km/s
Age1.3[3] Gyr
Other designations
BD+60°158, HD 6210, HIP 5021, SAO 11557[8]
Database references
SIMBADdata

This is an F-type main sequence star with a stellar classification of F7V.[3] Because of the stability of this star, it is used as a standard in the photometric WBVR system.[9] The angular diameter of this star has been measured directly using the CHARA Array, yielding an estimate of 4.5 times the diameter of the Sun. Stellar models suggest a mass equal to about twice that of the Sun, with 25 times the Sun's luminosity.[3]

This is a young star with an estimated age of 1.3 billion years.[10] It is rotating rapidly, with a projected rotational velocity of 42 km/s.[7] The abundance of elements other than hydrogen and helium is about the same as that in the Sun. The effective temperature of the stellar atmosphere is 6,089 K,[3] giving it the yellow-white hued glow of an F-type star.[10]

This star has been examined for the presence of an infrared excess, but no statistically significant amount was detected. The detection of such an excess can indicate the presence of a dusty circumstellar disk.[11]

References
  1. 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.
  2. Breger, M. (February 1974), "Pre-main-sequence stars. III. Herbig Be/Ae stars and other selected objects", Astrophysical Journal, 188: 53, Bibcode:1974ApJ...188...53B, doi:10.1086/152684.
  3. Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID 14911430, 40. See Table 3.
  4. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  5. Karatas, Y.; Schuster, W. J. (October 2006), "Metallicity and absolute magnitude calibrations for UBV photometry", Monthly Notices of the Royal Astronomical Society, 371 (4): 1793–1812, Bibcode:2006MNRAS.371.1793K, doi:10.1111/j.1365-2966.2006.10800.x.
  6. Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691.
  7. Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
  8. "HR 297". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-15.
  9. Khaliullin, Kh.; et al. (April 1985), "A new photometric WBVR system", Astrophysics and Space Science, 111 (2): 291–323, Bibcode:1985Ap&SS.111..291K, doi:10.1007/BF00649971, S2CID 133626910.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
  11. McDonald, I.; et al. (November 2011), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
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