U Lacertae

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U Lacertae
Lacerta constellation map.svg
Red circle.svg
Location of U Lacertae (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Lacerta
Right ascension 22h 47m 43.42677s [1]
Declination +55° 09′ 30.3036″ [1]
Apparent magnitude  (V)9.40 [2]
Characteristics
Spectral type M4epIab + B [3]
U−B color index +1.46 [2]
B−V color index +2.34 [2]
Variable type SRc [3]
Astrometry
Radial velocity (Rv)−68 [4] km/s
Proper motion (μ)RA: −3.207 [5] mas/yr
Dec.: −3.150 [5] mas/yr
Parallax (π)0.3519±0.0708  mas [5]
Distance 2,750 [6]   pc
Absolute magnitude  (MV)−5.6 [7]
Details
Mass 22 [7]   M☉
Radius 1,013 [8]   R☉
Luminosity 152,000 [8]   L☉
Temperature 3,535 [8]   K
Other designations
U  Lac, HIP  112545, PPM  411, GSC  03988-01641, IRC+50446, TYC  3988-1641-1, BD+54°2863, HD  215924, 2MASS  J22474341+5509303, AAVSO  2243+54
Database references
SIMBAD data

U Lacertae is a spectroscopic binary star in the constellation Lacerta.

Despite being in the constellation of Lacerta, U Lacertae is considered to be a member of the Cepheus OB1 association. [9] It has been listed as a member of the open cluster ASCC 123. [10]

U Lacertae is a binary star consisting of a red supergiant and a small hot companion, similar to VV Cephei. The companion has been identified from a high excitation component in the spectrum and from radial velocity variations, but the orbit is unknown. [11]

A visual band light curve for U Lacertae, plotted from AAVSO data ULacLightCurve.png
A visual band light curve for U Lacertae, plotted from AAVSO data

In 1894, T. H. E. C. Espin announced that the star, then called BD +54° 2863, might be a variable star. [13] T. W. Blackhouse confirmed its variability in 1897. [14] It was listed with its variable star designation, U Lacertae, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars. [15] U Lacertae is classified as a semiregular variable. [3] The periodicity is uncertain but a main period of 150 days and a long secondary period of 550 – 690 days have been suggested. [16] A study of Hipparcos satellite photometry found an amplitude of 0.77 magnitudes and found no periodicity. [17] The General Catalogue of Variable Stars lists an amplitude of 2.7 magnitudes. [3]

Water masers have been detected around U Lacertae, common in the extended atmospheres of very luminous cool stars. [18]

See also

References

  1. 1 2 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 3 Ducati, J. R. (2002). "VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 3 4 U Lac, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars Archived 2017-06-20 at the Wayback Machine , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.
  4. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  5. 1 2 3 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 at VizieR.
  6. ↑ Reiter, Megan; Marengo, Massimo; Hora, Joseph L.; Fazio, Giovanni G. (2015). "A Spitzer/IRAC characterization of Galactic AGB and RSG stars". Monthly Notices of the Royal Astronomical Society. 447 (4): 3909. arXiv: 1501.02749 . Bibcode:2015MNRAS.447.3909R. doi: 10.1093/mnras/stu2725 . S2CID   118515353.
  7. 1 2 Stothers, R.; Leung, K. C. (1971). "Luminosities, masses and periodicities of massive red supergiants". Astronomy and Astrophysics. 10: 290. Bibcode:1971A&A....10..290S.
  8. 1 2 3 Healy, Sarah; Horiuchu, Shunsaku; Colomer Moller, Marta; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi (2024). "Red supergiant candidates for multimessenger monitoring of the next Galactic supernova". Monthly Notices of the Royal Astronomical Society. 529 (4): 3630–3650. arXiv: 2307.08785 . Bibcode:2024MNRAS.529.3630H. doi: 10.1093/mnras/stae738 .
  9. ↑ Garmany, C. D.; Stencel, R. E. (1992). "Galactic OB associations in the northern Milky Way Galaxy. I - Longitudes 55 deg to 150 deg". Astronomy and Astrophysics Supplement Series. 94: 211. Bibcode:1992A&AS...94..211G.
  10. ↑ Zejda, M.; Paunzen, E.; Baumann, B.; Mikulášek, Z.; Liška, J. (2012). "Catalogue of variable stars in open cluster fields". Astronomy & Astrophysics. 548: A97. arXiv: 1211.1153 . Bibcode:2012A&A...548A..97Z. doi:10.1051/0004-6361/201219186. S2CID   54789717.
  11. ↑ Burki, G.; Mayor, M. (1983). "Nineteen new spectroscopic binaries and the rate of binary stars among F-M supergiants". Astronomy and Astrophysics. 124: 256. Bibcode:1983A&A...124..256B.
  12. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  13. ↑ Espin, T. E. (June 1894). "Stars with remarkable Spectra". Astronomische Nachrichten. 135 (16): 265–274. Bibcode:1894AN....135..265E. doi:10.1002/asna.18941351602 . Retrieved 21 December 2024.
  14. ↑ Blackhouse, T. W. (1902). "The variable star 2.1902 Lacertae". Astronomische Nachrichten. 158 (24): 383–384. doi:10.1002/asna.19021582407 . Retrieved 21 December 2024.
  15. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C . Retrieved 18 December 2024.
  16. ↑ Houk, N. (1963). "V1280 Sagttarii and the other long-period variables with secondary period". Astronomical Journal. 68: 253. Bibcode:1963AJ.....68..253H. doi:10.1086/108948.
  17. ↑ Adelman, Saul J. (2001). "Stars with the Largest Hipparcos Photometric Amplitudes". Baltic Astronomy. 10 (4): 589. Bibcode:2001BaltA..10..589A. doi: 10.1515/astro-2001-0403 . S2CID   116386247.
  18. ↑ Yoon, Dong-Hwan; Cho, Se-Hyung; Kim, Jaeheon; Yun, Young joo; Park, Yong-Sun (2014). "SiO and H2O Maser Survey toward Post-asymptotic Giant Branch and Asymptotic Giant Branch Stars". The Astrophysical Journal Supplement. 211 (1): 15. Bibcode:2014ApJS..211...15Y. doi: 10.1088/0067-0049/211/1/15 . S2CID   73561291.
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