Astronomy:Lambda Crateris

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Short description: Probable astrometric binary star in the constellation Crater
Lambda Crateris
Observation data
Equinox J2000.0]] (ICRS)
Constellation Crater
Right ascension  11h 23m 21.88432s[1]
Declination −18° 46′ 47.8910″[1]
Apparent magnitude (V) 5.08[2]
Characteristics
Spectral type F5 III[3]
U−B color index −0.04[2]
B−V color index +0.43[2]
Astrometry
Radial velocity (Rv)+13.26±0.60[4] km/s
Proper motion (μ) RA: −305.37[1] mas/yr
Dec.: +27.56[1] mas/yr
Parallax (π)23.32 ± 0.80[1] mas
Distance140 ± 5 ly
(43 ± 1 pc)
Absolute magnitude (MV)+1.92[5]
Orbit[6]
Period (P)1,940±84 d[7]
Eccentricity (e)0.54
Periastron epoch (T)32722
Argument of periastron (ω)
(secondary)		140.7°
Semi-amplitude (K1)
(primary)		2.5 km/s
Details
Mass1.78[8] M☉
Radius2.8[9] R☉
Luminosity14.4[5] L☉
Surface gravity (log g)4.06±0.11[4] cgs
Temperature6,582±54[4] K
Metallicity [Fe/H]−0.15±0.01[4] dex
Rotational velocity (v sin i)17.0[10] km/s
Other designations
λ Crt, 13 Crateris, BD−17° 3367, HD 98991, HIP 55598, HR 4395, SAO 156646.[11]
Database references
SIMBADdata

Lambda Crateris, Latinized from λ Crateris, is the Bayer designation for a suspected binary star[12] system in the southern constellation of Crater. With an annual parallax shift of 23.32[1] milliarcsecond as observed from Earth, it is located around 140 light years from the Sun. It is faintly visible to the naked eye with an apparent visual magnitude of 5.08.[2]

This is a probable astrometric binary[12] star system, with orbital elements first reported by Abt and Levy (1976). However, Morbey and Griffin (1987) later cast some doubt on the validity of these results, suggesting that further review is needed.[13] The visible member of this system, component A, is an evolved F-type giant star[10] with a stellar classification of F5 III.[3] It has an estimated 1.78[8] times the mass of the Sun and 2.8[9] times the Sun's radius. The star is spinning with a projected rotational velocity of 17[10] km/s.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M. 
  3. ↑ 3.0 3.1 Abt, Helmut A. (2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement 180 (1): 117–18, doi:10.1088/0067-0049/180/1/117, Bibcode: 2009ApJS..180..117A. 
  4. ↑ 4.0 4.1 4.2 4.3 Kordopatis, G. et al. (November 2013), "The Radial Velocity Experiment (RAVE): Fourth Data Release", The Astronomical Journal 146 (5): 36, doi:10.1088/0004-6256/146/5/134, 134, Bibcode: 2013AJ....146..134K. 
  5. ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ Batten, A. H. et al. (1978), "Seventh catalogue of the orbital elements of spectroscopic binary systems.", Publications of the Dominion Astrophysical Observatory Victoria 15: 121−295, Bibcode: 1978PDAO...15..121B.  See No. 431
  7. ↑ Abt, H. A.; Levy, S. G. (March 1976), "Multiplicity among solar-type stars", Astrophysical Journal Supplement Series 30: 273−306, doi:10.1086/190363, Bibcode: 1976ApJS...30..273A. 
  8. ↑ 8.0 8.1 Tokovinin, Andrei (2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal 147 (4): 14, doi:10.1088/0004-6256/147/4/87, 87, Bibcode: 2014AJ....147...87T. 
  9. ↑ 9.0 9.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  10. ↑ 10.0 10.1 10.2 Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2 [yes|permanent dead link|dead link}}]
  11. ↑ "lam Crt". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+Crt. 
  12. ↑ 12.0 12.1 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  13. ↑ Morbey, C. L.; Griffin, R. F. (June 1, 1987), "On the reality of certain spectroscopic orbits", Astrophysical Journal, Part 1 317: 343−352, doi:10.1086/165281, Bibcode: 1987ApJ...317..343M. 



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