Astronomy:11 Lacertae

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Short description: Star in the constellation Lacerta
11 Lacertae
300px
11 Lacertae in optical light
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lacerta[1]
Right ascension  22h 40m 30.85848s[2]
Declination +44° 16′ 34.7069″[2]
Apparent magnitude (V) 4.46[3]
Characteristics
Evolutionary stage red clump[4]
Spectral type K2.5 III[5]
U−B color index +1.36[3]
B−V color index +1.33[3]
Astrometry
Radial velocity (Rv)−10.91±0.09[6] km/s
Proper motion (μ) RA: +93.728[2] mas/yr
Dec.: +10.946[2] mas/yr
Parallax (π)9.317 ± 0.105[2] mas
Distance350 ± 4 ly
(107 ± 1 pc)
Absolute magnitude (MV)−0.54[7]
Details
Mass1.38[4] 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[4] 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.[7] The object is moving closer to the Earth with a heliocentric radial velocity of −10.9 km/s.[6]

This is an evolved giant star with a stellar classification of K2.5 III.[5] It is a red clump giant, meaning it is fusing helium in its core after passing through the red giant branch.[4] The star is 3.2[4] 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". http://cdsarc.u-strasbg.fr/viz-bin/Cat?VI/42. Retrieved 2006-12-26. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 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. ↑ 4.0 4.1 4.2 4.3 4.4 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. doi:10.1051/0004-6361/201526628. Bibcode: 2016A&A...587A.119A. 
  5. ↑ 5.0 5.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  6. ↑ 6.0 6.1 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. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch.; Niedzielski, A. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David et al. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal 162 (5): 198. doi:10.3847/1538-3881/ac2431. Bibcode: 2021AJ....162..198B. 
  9. ↑ 9.0 9.1 9.2 9.3 Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C. et al. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics 682: A145. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. Bibcode: 2024A&A...682A.145S.  11 Lacertae's database entry at VizieR.
  10. ↑ 10.0 10.1 Maldonado, J.; Villaver, E.; Niedzielski, A. (2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy and Astrophysics 588: A98. doi:10.1051/0004-6361/201527883. Bibcode: 2016A&A...588A..98M. 
  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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=11+Lac. 

Coordinates: Sky map 22h 40m 30.78s, +44° 16′ 34.6″



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