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 with the Hipparcos spacecraft put this system at a distance of roughly 263 light years.[1]

HR 297
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 01h 04m 19.45075s[1]
Declination +61° 34′ 48.6596″[1]
Apparent magnitude (V) 5.84[2]
Characteristics
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: −80.06[1] mas/yr
Dec.: −25.06[1] mas/yr
Parallax (π)12.38 ± 0.39[1] mas
Distance263 ± 8 ly
(81 ± 3 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.[11] 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.[12]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  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, 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.
  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.
  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 10, 2012, retrieved 2012-01-16.
  11. Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (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.
  12. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (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.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.