15 Arietis
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h10m37.59642s[2] |
| Declination | +19° 30′ 01.2099″[2] |
| Apparent magnitude(V) | 5.67 - 5.74[3] |
| Characteristics | |
| Spectral type | M3 III[1] |
| U−Bcolor index | +1.91[4] |
| B−Vcolor index | +1.64[4] |
| Variable type | SRs[3] |
| Astrometry | |
| Radial velocity(Rv) | +62.04 ± 0.22[5]km/s |
| Proper motion(μ) | RA:+87.88[2]mas/yr Dec.:-27.82[2]mas/yr |
| Parallax(π) | 5.84 ± 0.49mas[2] |
| Distance | 560 ± 50ly (170 ± 10pc) |
| Absolute magnitude(MV) | −0.9[6] |
| Details | |
| Mass | 1.4[6]M☉ |
| Radius | 87[6]R☉ |
| Luminosity | 781[7]L☉ |
| Temperature | 3,565[7]K |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Arietis(abbreviated15 Ari) is a single[8]variable starin the northernconstellationofAries.15 Arietisis theFlamsteed designation;it also bears thevariable star designationAV Arietis.It has anapparent visual magnitudeof 5.74,[8]which is just bright enough to be visible to the naked eye fromdark suburban skies.An annualparallaxshift of 5.84mas[2]corresponds to a physical distance of approximately 560light-years(170parsecs) from Earth. At that distance, the star's brightness is reduced by 0.33[5]in magnitude because ofextinctionfrominterstellar gas and dust.
This is ared giantstar with astellar classificationof M3 III.[1]The measuredangular diameterof this star is3.67 ± 0.11 mas.[9]At the estimated distance of Delta Ophiuchi,[2]this yields a physical size of about 67 times theradius of the Sun.[10]The radius determined from the observed brightness and colour of the star is 87R☉.[6]
15 Arietis is ashort period semiregular variablewith thedesignationAV Arietis. The period given in theGeneral Catalogue of Variable Starsis 5.032 days.[3]Longterm photometry finds that the strongest pulsation period is 18.1 days with an amplitude of 0.028 magnitudes, while a second is 21.9 days and 0.030 in magnitude.[1]
References
[edit]- ^abcdTabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants",Monthly Notices of the Royal Astronomical Society,400(4): 1945–1961,arXiv:0908.3228,Bibcode:2009MNRAS.400.1945T,doi:10.1111/j.1365-2966.2009.15588.x,S2CID15358380.
- ^abcdefgvan Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474(2): 653–664,arXiv:0708.1752,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID18759600.
- ^abcSamus, 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.Bibcode:2009yCat....102025S.
- ^abMermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)".Catalogue of Eggen's UBV Data.Bibcode:1986EgUBV........0M.
- ^abFamaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters",Astronomy and Astrophysics,430(1): 165–186,arXiv:astro-ph/0409579,Bibcode:2005A&A...430..165F,doi:10.1051/0004-6361:20041272,S2CID17804304.
- ^abcdKoen, Chris; Laney, Dave (2000)."Rapidly oscillating M giant stars?".Monthly Notices of the Royal Astronomical Society.311(3): 636.Bibcode:2000MNRAS.311..636K.doi:10.1046/j.1365-8711.2000.03127.x.
- ^abMcDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012)."Fundamental parameters and infrared excesses of Hipparcos stars".Monthly Notices of the Royal Astronomical Society.427(1): 343–357.arXiv:1208.2037.Bibcode:2012MNRAS.427..343M.doi:10.1111/j.1365-2966.2012.21873.x.S2CID118665352.
- ^abEggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society,389(2): 869–879,arXiv:0806.2878,Bibcode:2008MNRAS.389..869E,doi:10.1111/j.1365-2966.2008.13596.x,S2CID14878976.
- ^Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements",Astronomy and Astrophysics,431(2): 773–777,Bibcode:2005A&A...431..773R,doi:10.1051/0004-6361:20042039.
- ^Lang, Kenneth R. (2006),Astrophysical formulae,Astronomy and astrophysics library, vol. 1 (3rd ed.),Birkhäuser,ISBN3-540-29692-1..The radius (R*) is given by:
