16 Lacertae

Triple star system in the constellation Lacerta 250px A light curve for EN Lacertae, plotted from TESS data J2000.0 Lacerta 22 56 23.62929 +41 36 13.9482 5.587 0.015 B2 IV + F6–7 + F0 β Cep + Algol −12.45 0.04 −1.188 −4.290 2.0692 0.0865 −2.67 0.14 12.0969 d 0.0539 0.0026 61.4 2.1 23.85 0.05 16 Lac A 9.5 0.03 5.6 0.4 7762 1151 1002 commas 23000 200 commas 3.95 0.05 12 1 0.00 0.08 EN Lac 16 Lac +40°4949 216916 113281 8725 52512 *+16+Lac 16 Lacertae is a triple star system in the northern constellation of Lacerta, located about 1,580 light years from the Sun. It has the variable star designation EN Lacertae; 16 Lacertae is the Flamsteed designation. This system is visible to the naked eye as a faint blue-white hued star with a maximum apparent visual magnitude of +5.587. It is moving closer to the Earth with a heliocentric radial velocity of –12 km/s. The binary nature of the brighter component was discovered in 1910 by astronomer Oliver J. Lee at Yerkes Observatory. The first orbital elements were published by Otto Struve and Nicholay T. Bobrovnikov in 1925. This is a single-lined spectroscopic binary with an orbital period of 12.1 days and a small eccentricity of 0.05. It forms an eclipsing binary variable, although only the eclipse of the primary component has been detected. This component is a Beta Cephei variable star with three dominant pulsation modes having frequencies of around six per day. It has a stellar classification of B2 IV, matching a B-type subgiant star with 9.5 times the mass of the Sun and 5.6 times the Sun's radius. The unseen secondary is an F-type star of class F6–7. The tertiary component is a magnitude 11.4 star with a class of F0. As of 2008, it was located at an angular separation of 27.6 arcsecond from the primary. References 16 Lac 2019-02-02 1931240295282530688 MAST: Barbara A. Mikulski Archive for Space Telescopes https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Space Telescope Science Institute 8 December 2021 General Catalogue of Variable Stars 1 Samus N. N. Kazarovets E. V. Durlevich O. V. Kireeva N. N. Pastukhova E. N. 5.1 Astronomy Reports 2017 61 1 80–88 10.1134/S1063772917010085 2017ARep...61...80S 125853869 Lesh Janet Rountree The Kinematics of the Gould Belt: an Expanding Group? Astrophysical Journal Supplement 17 371 December 1968 10.1086/190179 1968ApJS...17..371L free Orbit of the spectroscopic binary 16 Lacertae Struve O. Bobrovnikoff N. T. Astrophysical Journal 62 139–143 September 1925 10.1086/142919 1925ApJ....62..139S A new analysis of the radial velocity variations of the eclipsing and spectroscopic binary EN Lacertae 1 Lehmann H. Harmanec P. Aerts C. Božić H. Eenens P. Hildebrandt G. Holmgren D. Mathias P. Scholz G. Šlechta M. Yang S. Astronomy and Astrophysics 367 236–249 February 2001 10.1051/0004-6361:20000344 2001A&A...367..236L free Nieva M.-F. Przybilla N. Present-day cosmic abundances. A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution and interstellar dust models Astronomy & Astrophysics 539 A143 2012 2012A&A...539A.143N 1203.5787 10.1051/0004-6361/201118158 119206639 The 2003–2004 multisite photometric campaign for the β Cephei and eclipsing star 16 (EN) Lacertae with an appendix on 2 Andromedae, the variable comparison star Jerzykiewicz M. Handler G. Daszyńska-Daszkiewicz J. Pigulski A. Poretti E. Rodríguez E. Amado P. J. Kołaczkowski Z. Uytterhoeven K. Dorokhova T. N. Dorokhov N. I. Lorenz D. Zsuffa D. Kim S.-L. Bourge P.-O. Acke B. De Ridder J. Verhoelst T. Drummond R. Movchan A. I. Lee J.-A. Stȩślicki M. Molenda-Żakowicz J. Garrido R. Kim S.-H. Michalska G. Paparó M. Antoci V. Aerts C. 1 Monthly Notices of the Royal Astronomical Society 454 1 724–740 2015 1508.05250 2015MNRAS.454..724J 10.1093/mnras/stv1958 free 119220117 Nieva María-Fernanda Przybilla Norbert Fundamental properties of nearby single early B-type stars Astronomy & Astrophysics 566 A7 2014 10.1051/0004-6361/201423373 2014A&A...566A...7N 1412.1418 119227033 1 Pourbaix D. Tokovinin A. A. Batten A. H. Fekel F. C. Hartkopf W. I. Levato H. Morrell N. I. Torres G. Udry S. 2004 727–732 424 SB9: The Ninth Catalogue of Spectroscopic Binary Orbits Astronomy & Astrophysics 2004A&A...424..727P 10.1051/0004-6361:20041213 astro-ph/0406573 119387088 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 September 2008 10.1111/j.1365-2966.2008.13596.x free 2008MNRAS.389..869E 0806.2878 14878976 Category:Beta Cephei variables Category:Eclipsing binaries Category:Spectroscopic binaries Category:Triple star systems Category:Lacerta Lacertae, 16 Category:Durchmusterung objects 216916 113281 8725 Lacertae, EN Category:B2IV stars Category:F0 stars