KIC 11145123

Last updated
KIC 11145123
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 19h 41m 25.34114s [1]
Declination +48° 45′ 14.9900″ [1]
Apparent magnitude  (V)13.12 [2]
Characteristics
Evolutionary stage main sequence [1]
Spectral type F7V [3]
B−V color index +0.33 [2]
Variable type δ Scuti [4]
Astrometry
Radial velocity (Rv)−136±4 [5]  km/s
Proper motion (μ)RA: −20.900  mas/yr [1]
Dec.: −3.693  mas/yr [1]
Parallax (π)0.8344 ± 0.01  mas [1]
Distance 3,910 ± 50  ly
(1,200 ± 10  pc)
Details
Mass 1.46 [6]   M☉
Radius 1.57±0.07 [7]   R☉
Luminosity 12.6 [8]   L☉
Surface gravity (log g)4.22 [8]   cgs
Temperature 7,590 [8]   K
Metallicity [Fe/H]−0.1±0.11 [8]   dex
Rotation ≈100 days [8]
Rotational velocity (v sin i)1 [8]  km/s
Age 756 [1]   Myr
Other designations
KIC  11145123, 2MASS J19412534+4845150
Database references
SIMBAD data

KIC 11145123 (sometimes mistakenly called Kepler 11145123 [9] ), is a white hued star located in the northern constellation Cygnus, the swan. It has an apparent magnitude of 13.12, [2] making it readily visible in large telescopes, but not to the naked eye. The object is located relatively far at a distance of approximately 3,910 light years, [1] but is rapidly approaching the Solar System with a radial velocity of −136  km/s . [5]

Contents

Characteristics

KIC 11145123 has a spectral classification of F7V, [3] indicating that it is a main sequence F-type star. Atmospheric models suggest it may be hotter and possibly a late A-type star. [4] It has 1.4 times the mass of the Sun, in contrast to the 1.7 times that would be expected from a normal late A main sequence star, and 1.57 times its radius. [7] It radiates 12 times the luminosity of the Sun from its photosphere at an effective temperature of 7,590  K . [8] Unlike most hot stars, KIC 11145123 spins exceptionally slowly with a projected rotational velocity of 1  km/s . [8] This corresponds to a period of roughly 100 days. [8] Despite appearing as a main sequence star (Gaia DR3 models it as such), [1] it is most likely a blue straggler. [10] [6]

Roundest natural object

KIC 11145123 is currently believed be the roundest natural object, with the difference between equatorial and polar radii equaling a mere three kilometers. [9]

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References

  1. 1 2 3 4 5 6 7 8 9 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z. 1322. Bibcode:2012yCat.1322....0Z.
  3. 1 2 Frasca, A.; Molenda-Żakowicz, J.; De Cat, P.; Catanzaro, G.; Fu, J. N.; Ren, A. B.; Luo, A. L.; Shi, J. R.; Wu, Y.; Zhang, H. T. (2016). "Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra". Astronomy and Astrophysics. 594. arXiv: 1606.09149 . Bibcode:2016A&A...594A..39F. doi:10.1051/0004-6361/201628337. S2CID   119283349.
  4. 1 2 Kurtz, Donald W.; Saio, Hideyuki; Takata, Masao; Shibahashi, Hiromoto; Murphy, Simon J.; Sekii, Takashi (13 August 2014). "Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123". Monthly Notices of the Royal Astronomical Society. 444 (1): 102–116. arXiv: 1405.0155 . Bibcode:2014MNRAS.444..102K. doi: 10.1093/mnras/stu1329 . eISSN   1365-2966. ISSN   0035-8711.
  5. 1 2 Tsantaki, M.; Pancino, E.; Marrese, P.; Marinoni, S.; Rainer, M.; Sanna, N.; Turchi, A.; Randich, S.; Gallart, C.; Battaglia, G.; Masseron, T. (March 2022). "Survey of Surveys". Astronomy & Astrophysics. 659: A95. arXiv: 2110.09316 . Bibcode:2022A&A...659A..95T. doi: 10.1051/0004-6361/202141702 . eISSN   1432-0746. ISSN   0004-6361.
  6. 1 2 Hatta, Yoshiki; Sekii, Takashi; Takata, Masao; Benomar, Othman (2021). "Nonstandard Modeling of a Possible Blue Straggler Star, KIC 11145123". The Astrophysical Journal. 923 (2): 244. arXiv: 2110.06926 . Bibcode:2021ApJ...923..244H. doi: 10.3847/1538-4357/ac23c9 . S2CID   238856685.
  7. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881.
  8. 1 2 3 4 5 6 7 8 9 Takada-Hidai, Masahide; Kurtz, Donald W.; Shibahashi, Hiromoto; Murphy, Simon J.; Takata, Masao; Saio, Hideyuki; Sekii, Takashi (2017). "Spectroscopic and asteroseismic analysis of the remarkable main-sequence a star KIC 11145123". Monthly Notices of the Royal Astronomical Society. 470 (4): 4908. arXiv: 1706.04314 . Bibcode:2017MNRAS.470.4908T. doi: 10.1093/mnras/stx1506 .
  9. 1 2 "Kepler 11145123 is Most Spherical Natural Object Ever Seen, Astronomers Say | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. 18 November 2016. Retrieved 2021-04-26.
  10. ↑ Hatta, Yoshiki; Sekii, Takashi; Takata, Masao; Kurtz, Donald W. (2019). "The Two-dimensional Internal Rotation of KIC 11145123". The Astrophysical Journal. 871 (2): 135. arXiv: 2111.06853 . Bibcode:2019ApJ...871..135H. doi: 10.3847/1538-4357/aaf881 . S2CID   127611459.
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