11 Lacertae

11 Lacertae

11 Lacertae in optical light
Observation data
Epoch J2000      Equinox J2000
Constellation Lacerta[1]
Right ascension 22h 40m 30.85848s[2]
Declination +44° 16′ 34.7069″[2]
Apparent magnitude (V) 4.46[3]
Characteristics
Spectral type K2.5 III[4]
U−B color index +1.36[3]
B−V color index +1.33[3]
Astrometry
Radial velocity (Rv)−10.91±0.09[5] km/s
Proper motion (μ) RA: +93.728 mas/yr[2]
Dec.: +10.946 mas/yr[2]
Parallax (π)9.317 ± 0.105 mas[2]
Distance350 ± 4 ly
(107 ± 1 pc)
Absolute magnitude (MV)−0.54[6]
Details
Mass1.38[7] M☉
Radius29.5±0.5[8] R☉
Luminosity279±10[9] L☉
Surface gravity (log g)1.56±0.06[9] cgs
Temperature4,352[10] K
Metallicity [Fe/H]−0.2±0.02[9] dex
Rotational velocity (v sin i)8[11] km/s
Age3.2[7] Gyr
Other designations
11 Lac, BD+43° 4266, HD 214868, HIP 111944, HR 8632, SAO 52251[12]
Database references
SIMBADdata

11 Lacertae is a star in the northern constellation of Lacerta. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.46.[3] It lies at a distance of about 350[2] light years and has an absolute magnitude -0.54.[6] The object is moving closer to the Earth with a heliocentric radial velocity of −10.9 km/s.[5]

This is an evolved giant star with a stellar classification of K2.5 III.[4] It is a red clump giant, meaning it is fusing helium in its core after passing through the red giant branch.[7] The star is 3.2[7] billion years old with 1.38 times the mass of the Sun and has expanded to 39 times the Sun's radius.[8] It is radiating 280[9] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,352 K.[10]

References

  1. ^ Roman, N. G. (1987). "Identification of a Constellation from a Position". Retrieved 2006-12-26.
  2. ^ a b c d e 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 at VizieR.
  3. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  4. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  5. ^ a b Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  6. ^ a b Anderson, E.; Francis, Ch.; Niedzielski, A. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  7. ^ a b c d Adamczyk, M.; Deka-Szymankiewicz, B.; Niedzielski, A. (2016). "Masses and luminosities for 342 stars from the PennState-Toruń Centre for Astronomy Planet Search". Astronomy and Astrophysics. 587: A119. arXiv:1510.07495. Bibcode:2016A&A...587A.119A. doi:10.1051/0004-6361/201526628. S2CID 119299522.
  8. ^ a b Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R.; Van Belle, Gerard T. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431.
  9. ^ a b c d Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics. 682: A145. arXiv:2310.11302. Bibcode:2024A&A...682A.145S. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. 11 Lacertae's database entry at VizieR.
  10. ^ a b Maldonado, J.; Villaver, E.; Niedzielski, A. (2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy and Astrophysics. 588: A98. arXiv:1602.00835. Bibcode:2016A&A...588A..98M. doi:10.1051/0004-6361/201527883. S2CID 119212009.
  11. ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1): 1. Bibcode:1970CoAsi.239....1B.
  12. ^ "11 Lac". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-01.