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]
| 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] |
| Distance | 256.4 ± 0.6 ly (78.6 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.30[5] |
| Details | |
| Mass | 1.953[3] M☉ |
| Radius | 4.52±0.15[3] R☉ |
| Luminosity | 25.16±1.59[3] L☉ |
| Surface gravity (log g) | 3.86[6] cgs |
| Temperature | 6,089±35[3] K |
| Metallicity [Fe/H] | −0.01[3] dex |
| Rotational velocity (v sin i) | 42.0[7] km/s |
| Age | 1.3[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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]
- ^ "HR 297". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-15.
- ^ 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.
- ^ 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.
- ^ 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.