Astronomy:HR 297
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: −24.915[1] mas/yr |
| Parallax (π) | 12.7218 ± 0.0301[1] mas |
| 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 |
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Breger, M. (February 1974), "Pre-main-sequence stars. III. Herbig Be/Ae stars and other selected objects", Astrophysical Journal 188: 53, doi:10.1086/152684, Bibcode: 1974ApJ...188...53B.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 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, doi:10.1088/0004-637X/771/1/40, 40, Bibcode: 2013ApJ...771...40B. See Table 3.
- ↑ 4.0 4.1 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, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 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, doi:10.1111/j.1365-2966.2006.10800.x, Bibcode: 2006MNRAS.371.1793K.
- ↑ Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1 354: 310–332, doi:10.1086/168691, Bibcode: 1990ApJ...354..310B.
- ↑ 7.0 7.1 Schröder, C. et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2[yes|permanent dead link|dead link}}]
- ↑ "HR 297". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+297.
- ↑ Khaliullin, Kh. et al. (April 1985), "A new photometric WBVR system", Astrophysics and Space Science 111 (2): 291–323, doi:10.1007/BF00649971, Bibcode: 1985Ap&SS.111..291K, https://link.springer.com/article/10.1007/BF00649971.
- ↑ 10.0 10.1 "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, 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, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
Coordinates: 
01h 04m 19.45s, +61° 34′ 48.66″
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