5 Lacertae

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5 Lacertae
Lacerta constellation map.svg
Red circle.svg
Location of 5 Lacertae (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Lacerta
Right ascension 22h 29m 31.823s [1]
Declination +47° 42′ 24.79″ [1]
Apparent magnitude  (V)4.36 [2]
Characteristics
Spectral type K9Ia + B2V [3]
U−B color index +1.11 [2]
B−V color index +1.68 [2]
Variable type LC [4]
Astrometry
Radial velocity (Rv)−3.4±0.2 [5]  km/s
Proper motion (μ)RA: −0.37±0.13 [1]   mas/yr
Dec.: −3.33±0.12 [1]   mas/yr
Parallax (π)1.98 ± 0.18  mas [1]
Distance 1,600 ± 100  ly
(510 ± 50  pc)
Orbit [5]
Period (P)41.95±0.20 yr
Eccentricity (e)0.49±0.01
Periastron epoch (T)2427578.3±260  JD
Argument of periastron (ω)
(secondary)		323±5.0°
Semi-amplitude (K1)
(primary)		12.2±1.2 km/s
Semi-amplitude (K2)
(secondary)		112.0±8.2 km/s
Details
5 Lacertae A
Mass 5.11±0.18 [6]   M☉
Radius 319.2+26.6
−32.0 [6]   R☉
Luminosity 17473±3344 [6]   L☉
Temperature 3713±56 [6]   K
Rotational velocity (v sin i)50 [7]  km/s
Age 110±10 [6]   Myr
5 Lacertae B
Temperature 7,580 [8]   K
Rotational velocity (v sin i)89 [2]  km/s
Other designations
V412 Lac, BD+46° 3719, FK5  3799, HD  213310/1, HIP  111022, HR  8572, SAO  52055 [3]
Database references
SIMBAD data
5 Lacertae in optical light 5 Lacertae.jpg
5 Lacertae in optical light

5 Lacertae (5 Lac) is a spectroscopic binary in the constellation Lacerta. Its apparent magnitude is 4.36.

A light curve for V412 Lacertae, plotted from Hipparcos data V412LacLightCurve.png
A light curve for V412 Lacertae, plotted from Hipparcos data

5 Lacertae is a slow irregular variable star with a small amplitude. Photometry from the Hipparcos satellite showed brightness changes between Hipparcos magnitudes 4.39 and 4.56 with no clear periodicity. [4] It was given the variable star designation V412 Lacertae in 1999 in a special name-list dedicated to variables detected from Hipparcos. [10]

The spectrum of 5 Lacertae clearly indicates both a hot component and a cooler component, recognised even in early spectra. Published spectral types for the brighter cool component vary from K4 to M0, with a luminosity class of giant or supergiant. The hotter star is generally classed as a relatively unevolved late B or early A star, but an automated classification program gave it a spectral class of B2V. [11]

Radial velocity variations in the absorption lines from the two separate stars have been measured to determine the orbit. This has an unusually long period of almost 42 years. The two stars have an eccentric orbit with a projected axis of about 15 au. [5]

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References

  1. 1 2 3 4 5 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. Vizier catalog entry
  2. 1 2 3 4 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  3. 1 2 "5 Lacertae". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-03-26.
  4. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. 1 2 3 Hendry, E. M. (1978). "Observations of a second maximum for the very long period spectroscopic binary 5 Lac". Publications of the Astronomical Society of the Pacific. 90: 184–187. Bibcode:1978PASP...90..184H. doi: 10.1086/130304 .
  6. 1 2 3 4 5 Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155 (1). 30. arXiv: 1712.08109 . Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b. S2CID   119427037.
  7. ↑ Van Belle, Gerard T (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv: 1204.2572 . Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2. S2CID   119273474.
  8. ↑ Hohle, M.M; Neuhäuser, R; Schutz, B.F (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335 . Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID   111387483.
  9. ↑ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  10. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659 (4659): 1. Bibcode:1999IBVS.4659....1K.
  11. ↑ Skiff, B. A. (2014). "VizieR On-line Data Catalog: Catalogue of Stellar Spectral Classifications". VizieR On-line Data Catalog. Bibcode:2014yCat....1.2023S.
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