Suspected variable star in Triangulum
HD 11928 (HR 564; NSV 15408 ) is a solitary star[ 13] Triangulum . It is faintly visible to the naked eye as a red-hued point of light with anapparent magnitude of 5.85.[ 14] Gaia DR3 parallax measurements imply a distance of 530light-years and it is drifting closer with a heliocentricradial velocity ofkm/s [ 6] interstellar extinction of 0.13magnitudes [ 15] absolute magnitude of +0.11.[ 7]
HD 11928 has astellar classification of M2 III,[ 4] evolved M-type giant star . It is currently anasymptotic giant branch star that is generating energy via the fusion ofhydrogen andhelium shells around an inertcarbon core . At present it has expanded to 52.68 times theradius of the Sun [ 8] luminosity of the Sun [ 9] photosphere at aneffective temperature ofK [ 11]
In 1997, theHipparcos satellite observed that the star varied from 5.89 to 5.93 in theHipparcos passband .[ 16] days .[ 17] [ 18]
^a b c d Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1".Astronomy Reports .61 (1):80– 88.Bibcode :2017ARep...61...80S .doi :10.1134/S1063772917010085 .eISSN 1562-6881 .ISSN 1063-7729 .S2CID 125853869 . ^ Eggen, Olin J. (July 1992)."Asymptotic giant branch stars near the sun" .The Astronomical Journal .104 : 275.Bibcode :1992AJ....104..275E .doi :10.1086/116239 ISSN 0004-6256 .S2CID 121672252 . ^a b Wilson, Ralph E.; Joy, Alfred H. (March 1950)."Radial Velocities of 2111 Stars" .The Astrophysical Journal .111 : 221.Bibcode :1950ApJ...111..221W .doi :10.1086/145261 eISSN 1538-4357 .ISSN 0004-637X .S2CID 122883647 . ^ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)".Private Communication .Bibcode :1970Priv.........0H .S2CID 231475662 . ^a b Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005)."Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters" .Astronomy and Astrophysics .430 : 165.arXiv :astro-ph/0409579 Bibcode :2005A&A...430..165F .doi :10.1051/0004-6361:20041272 S2CID 17804304 . ^a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation".Astronomy Letters .38 (5):331– 346.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 .eISSN 1562-6873 .ISSN 1063-7737 .S2CID 119257644 . ^a b Stassun, Keivan G.; et al. (9 September 2019)."The RevisedTESS Input Catalog and Candidate Target List" .The Astronomical Journal .158 (4): 138.arXiv :1905.10694 Bibcode :2019AJ....158..138S .doi :10.3847/1538-3881/ab3467 eISSN 1538-3881 .hdl :1721.1/124721 S2CID 166227927 . ^a b 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 atVizieR .^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017)."Fundamental parameters and infrared excesses of Tycho–Gaia stars" .Monthly Notices of the Royal Astronomical Society .471 (1):770– 791.arXiv :1706.02208 Bibcode :2017MNRAS.471..770M .doi :10.1093/mnras/stx1433 eISSN 1365-2966 .ISSN 0035-8711 .S2CID 73594365 . ^a b van Belle, G. T.; Lane, B. F.; Thompson, R. R.; Boden, A. F.; Colavita, M. M.; Dumont, P. J.; Mobley, D. W.; Palmer, D.; Shao, M.; Vasisht, G. X.; Wallace, J. K.; Creech-Eakman, M. J.; Koresko, C. D.; Kulkarni, S. R.; Pan, X. P.; Gubler, J. (1999)."Radii and Effective Temperatures for G, K, and M Giants and Supergiants" .The Astronomical Journal .117 (1):521– 533.Bibcode :1999AJ....117..521V .doi :10.1086/300677 S2CID 18617983 . ^ "HD 11928" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedMay 11, 2024 .^ Eggleton, P. P.; Tokovinin, A. A. (11 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 eISSN 1365-2966 .ISSN 0035-8711 .S2CID 14878976 . ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".Astronomy and Astrophysics .355 :L27– L30.Bibcode :2000A&A...355L..27H .ISSN 0004-6361 .S2CID 17128864 . ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017)."Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars" .Monthly Notices of the Royal Astronomical Society .472 (4):3805– 3820.arXiv :1709.01160 Bibcode :2017MNRAS.472.3805G .doi :10.1093/mnras/stx2219 eISSN 1365-2966 .ISSN 0035-8711 .S2CID 118879856 . ^ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (July 1997). "The HIPPARCOS Catalogue".Astronomy and Astrophysics .323 :L49– L52.Bibcode :1997A&A...323L..49P .ISSN 0004-6361 . ^ Koen, Chris; Eyer, Laurent (March 2002)."New periodic variables from theHipparcos epoch photometry" .Monthly Notices of the Royal Astronomical Society .331 (1):45– 59.arXiv :astro-ph/0112194 Bibcode :2002MNRAS.331...45K .doi :10.1046/j.1365-8711.2002.05150.x eISSN 1365-2966 .ISSN 0035-8711 .S2CID 10505995 . ^ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)".VizieR Online Data Catalog : II/250.Bibcode :2004yCat.2250....0S .
