HR 297

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

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]

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. ^ a b c d e 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. ^ a b c d 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. ^ a b c d e f g h i j 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. ^ a b 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. ^ a b 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[permanent dead link‍]
  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. ^ a b "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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