Astronomy:26 Arietis

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Short description: Star in the constellation Aries
26 Arietis
26AriLightCurve.png
A visual band light curve for 26 Arietis, adapted from Breger (1969)[1]
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
Distance237 ± 1 ly
(72.6 ± 0.4 pc)
Absolute magnitude (MV)1.89[7]
Details
Mass1.74[8] M☉
Radius2.32+0.11
−0.12[2] R☉
Luminosity15[7] L☉
Surface gravity (log g)3.84[7] cgs
Temperature7,430[7] K
Rotational velocity (v sin i)186[9] km/s
Age1.075[8] Gyr
Other designations
26 Ari, UU Arietis, BD+19°365, FK5 2172, HD 15550, HIP 11678, HR 729, SAO 92979[10]
Database references
SIMBADdata

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]

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. http://articles.adsabs.harvard.edu/pdf/1969AJ.....74..166B. Retrieved 27 October 2021. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 Samus, N. N. 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. ↑ 4.0 4.1 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. ↑ 5.0 5.1 5.2 Breger, M. (March 1968), "UBV and narrow-band UVBY photometry of bright stars", Astronomical Journal 73: 84–85, doi:10.1086/110602, Bibcode: 1968AJ.....73...84B. 
  6. ↑ 6.0 6.1 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. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 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, doi:10.1051/0004-6361:20020854, Bibcode: 2002A&A...392..515P. 
  8. ↑ 8.0 8.1 8.2 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D. 
  9. ↑ Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R. 
  10. ↑ "UU Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UU+Ari. 
  11. ↑ Rodríguez, E. et al. (June 2000), "A revised catalogue of delta Sct stars", Astronomy and Astrophysics Supplement 144 (3): 469–474, doi:10.1051/aas:2000221, Bibcode: 2000A&AS..144..469R. 

External links



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