15 Arietis

Single, variable star in the constellation Aries 250px A visual band light curve for 15 Arietis, plotted from data presented by Tabur et al. (2009) J2000 02 10 37.59642 +19 30 01.2099 5.67 - 5.74 Aries AGB M3 III +1.64 +1.91 SRs +62.04 ± 0.22 +87.88 -27.82 5.84 0.49 −0.9 1.4 87 781 3,565 AV Arietis, BD+18°277, FK5 1056, HD 13325, HIP 10155, HR 631, SAO 92822 15+Arietis 15 Arietis (abbreviated 15 Ari) is a single variable star in the northern constellation of Aries. 15 Arietis is the Flamsteed designation; it also bears the variable star designation AV Arietis. It has an apparent visual magnitude of 5.74, which is just bright enough to be visible to the naked eye from dark suburban skies. An annual parallax shift of 5.84 mas corresponds to a physical distance of approximately 560 ly pc off on from Earth. At that distance, the star's brightness is reduced by 0.33 in magnitude because of extinction from interstellar gas and dust. This is a red giant star with a stellar classification of M3 III. The measured angular diameter of this star is 3.67 ± 0.11 mas. At its estimated distance, this yields a physical size of about 67 times the radius of the Sun. The radius determined from the observed brightness and colour of the star is 87. 15 Arietis is a short period semiregular variable with the designation AV Arietis. The period given in the General Catalogue of Variable Stars is 5.032 days. 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. References 2012MNRAS.427..343M Fundamental parameters and infrared excesses of Hipparcos stars Monthly Notices of the Royal Astronomical Society 427 343–357 McDonald I. Zijlstra A. A. Boyer M. L. 2012 1 10.1111/j.1365-2966.2012.21873.x free 1208.2037 118665352 F. van Leeuwen November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 2007A&A...474..653V 10.1051/0004-6361:20078357 0708.1752 18759600 . 1 Famaey B. Jorissen A. Luri X. Mayor M. Udry S. Dejonghe H. Turon C. 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 January 2005 10.1051/0004-6361:20041272 2005A&A...430..165F astro-ph/0409579 17804304 . 1 Tabur V. Bedding T. R. Kiss L. L. Moon T. T. Szeidl B. Kjeldsen H. Long-term photometry and periods for 261 nearby pulsating M giants Monthly Notices of the Royal Astronomical Society 400 4 1945–1961 10.1111/j.1365-2966.2009.15588.x 2009MNRAS.400.1945T . 0908.3228 December 2009 free 15358380 Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 10.1111/j.1365-2966.2008.13596.x 2008MNRAS.389..869E 0806.2878 . September 2008 free 14878976 Richichi A. Percheron I. Khristoforova M. CHARM2: An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773–777 10.1051/0004-6361:20042039 2005A&A...431..773R . February 2005 free Kenneth R. Lang Astrophysical formulae 1 Astronomy and astrophysics library 3rd Birkhäuser 2006 3-540-29692-1 https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 . . The radius (R*) is given by: 1986EgUBV........0M Compilation of Eggen's UBV data, transformed to UBV (unpublished) Catalogue of Eggen's UBV Data Mermilliod J.-C. 1986 1992AJ....104..275E Asymptotic Giant Branch Stars Near the Sun Eggen Olin J. The Astronomical Journal 1992 104 275 10.1086/116239 2000MNRAS.311..636K Rapidly oscillating M giant stars? Monthly Notices of the Royal Astronomical Society 311 3 636 Koen Chris Laney Dave 2000 10.1046/j.1365-8711.2000.03127.x free 2009yCat....102025S 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 etal Samus N. N. Durlevich O. V. 2009 External links HR 631 Image 15 Arietis 013325 010155 Arietis, 15 Category:Aries (constellation) Category:M3III stars Arietis, AV 0631 Category:Short period semiregular variable Category:Durchmusterung objects Category:Asymptotic-giant-branch stars