26 Arietis

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26 Arietis
26AriLightCurve.png
A visual band light curve for 26 Arietis, adapted from Breger (1969) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Aries
Right ascension 02h 30m 38.41727s [2]
Declination +19° 51′ 19.0917″ [2]
Apparent magnitude  (V)6.10 - 6.15 [3]
Characteristics
Spectral type A9 V [4]
U−B color index +0.102 [5]
B−V color index +0.248 [5]
Variable type Delta Scuti variable [3]
Astrometry
Radial velocity (Rv)+15.0 [6]  km/s
Proper motion (μ)RA: +79.814 [2]   mas/yr
Dec.: −34.746 [2]   mas/yr
Parallax (π)13.7810 ± 0.0831  mas [2]
Distance 237 ± 1  ly
(72.6 ± 0.4  pc)
Absolute magnitude  (MV)1.89 [7]
Details
Mass 1.74 [8]   M☉
Radius 2.32+0.11
−0.12 [2]   R☉
Luminosity 15 [7]   L☉
Surface gravity (log g)3.84 [7]   cgs
Temperature 7,430 [7]   K
Rotational velocity (v sin i)186 [9]  km/s
Age 1.075 [8]   Gyr
Other designations
26 Ari, UU Arietis, BD+19°365, FK5  2172, HD  15550, HIP  11678, HR  729, SAO  92979 [10]
Database references
SIMBAD data

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, [5] 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 [2] 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. [6]

This is an A-type main sequence star with a stellar classification of A9 V. [4] It is a Delta Scuti variable [7] with a variability period of 0.0676 days and an amplitude of 0.010 in magnitude. [11] The star is around a billion years old with 1.74 [8] times the mass of the Sun and 2.32 [2] 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. [7]

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References

  1. ↑ Breger, M. (March 1969). "Short-period variability of B, A, and F stars. II. Photometry of new Delta Scuti stars". The Astronomical Journal. 74 (1): 166–176. doi: 10.1086/110788 . Retrieved 27 October 2021.
  2. 1 2 3 4 5 6 7 8 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.
  3. 1 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.
  4. 1 2 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.
  5. 1 2 3 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.
  6. 1 2 Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, Astronomisches Rechen-Institut Heidelberg, 35 (35): 1, Bibcode:1999VeARI..35....1W.
  7. 1 2 3 4 5 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 (2): 515–528, arXiv: astro-ph/0207494 , Bibcode:2002A&A...392..515P, doi:10.1051/0004-6361:20020854, S2CID   54666586.
  8. 1 2 3 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, S2CID   33401607.
  9. ↑ 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, S2CID   18475298.
  10. ↑ "UU Ari". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-18.
  11. ↑ Rodríguez, E.; et al. (June 2000), "A revised catalogue of delta Sct stars", Astronomy and Astrophysics Supplement, 144 (3): 469–474, Bibcode:2000A&AS..144..469R, doi: 10.1051/aas:2000221 .
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