26 Arietis

26 Arietis is a variable star in the northern constellation of Aries. 26 Arietis is the Flamsteed designation; it also bears the variable star designation UU Arietis. The apparent visual magnitude of this star is 6.14,[4] which, according to the Bortle Dark-Sky Scale, is within the naked eye visibility limit in dark rural skies. The annual parallax shift of 13.78 mas[1] is equivalent to a distance of approximately 215 light-years (66 parsecs) from Earth. The star is receding from the Earth with a heliocentric radial velocity of +15 km/s.[5]

26 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  02h 30m 38.41727s[1]
Declination +19° 51′ 19.0917″[1]
Apparent magnitude (V) 6.10 - 6.15[2]
Characteristics
Spectral type A9 V[3]
U−B color index +0.102[4]
B−V color index +0.248[4]
Variable type Delta Scuti variable[2]
Astrometry
Radial velocity (Rv)+15.0[5] km/s
Proper motion (μ) RA: +79.814[1] mas/yr
Dec.: −34.746[1] mas/yr
Parallax (π)13.7810 ± 0.0831[1] mas
Distance237 ± 1 ly
(72.6 ± 0.4 pc)
Absolute magnitude (MV)1.89[6]
Details
Mass1.74[7] M☉
Radius2.32+0.11
−0.12[1] R☉
Luminosity15[6] L☉
Surface gravity (log g)3.84[6] cgs
Temperature7,430[6] K
Rotational velocity (v sin i)186[8] km/s
Age1.075[7] Gyr
Other designations
26 Ari, UU Arietis, BD+19°365, FK5 2172, HD 15550, HIP 11678, HR 729, SAO 92979[9]
Database references
SIMBADdata

This is an A-type main sequence star with a stellar classification of A9 V.[3] It is a Delta Scuti variable[6] with a variability period of 0.0676 days and an amplitude of 0.010 in magnitude.[10] The star is around a billion years old with 1.74[7] times the mass of the Sun and 2.32[1] times the Sun's radius. The star is radiating 15 times the luminosity of the Sun from its photosphere at an effective temperature of 7,430 K.[6]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S.
  3. Palmer, D. R.; et al. (1968), "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars", Royal Observatory Bulletin, 135: 385, Bibcode:1968RGOB..135..385P.
  4. Breger, M. (March 1968), "UBV and narrow-band UVBY photometry of bright stars", Astronomical Journal, 73: 84–85, Bibcode:1968AJ.....73...84B, doi:10.1086/110602.
  5. Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions, Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
  6. Paunzen, E.; et al. (September 2002), "On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of lambda Bootis type stars", Astronomy and Astrophysics, 392: 515–528, arXiv:astro-ph/0207494, Bibcode:2002A&A...392..515P, doi:10.1051/0004-6361:20020854.
  7. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  8. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
  9. "UU Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
  10. Rodríguez, E.; et al. (June 2000), "A revised catalogue of delta Sct stars", Astronomy and Astrophysics Supplement, 144: 469–474, Bibcode:2000A&AS..144..469R, doi:10.1051/aas:2000221.
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