From Wikipedia, the free encyclopedia
ε Cancri
Location of ε Cancri (circled red)
Observation data
Epoch J2000       Equinox J2000
Constellation Cancer
ε Cnc A
Right ascension 08h 40m 27.01010s [1]
Declination 19° 32′ 41.3243″ [1]
Apparent magnitude (V) 6.29 [2]
HD 73711
Right ascension 08h 40m 18.09670s [3]
Declination 19° 31′ 55.1636″ [3]
Apparent magnitude (V) 7.535 [4]
Characteristics
ε Cnc A
Spectral type A5 III [5] (kA3hA5mF0) [6]
U−B color index +0.16 [7]
B−V color index +0.17 [7]
HD 73711
Spectral type F0III [8] (kA3hA5mF0) [9]
Astrometry
ε Cnc A
Radial velocity (Rv)+29.9±1.1 [10] km/s
Proper motion (μ) RA: −36.293 [1]  mas/ yr
Dec.: −12.133 [1]  mas/ yr
Parallax (π)5.3836 ± 0.0474  mas [1]
Distance606 ± 5  ly
(186 ± 2  pc)
Absolute magnitude (MV)+0.00 [2]
HD 73711
Proper motion (μ) RA: −36.251 [3]  mas/ yr
Dec.: −12.118 [3]  mas/ yr
Parallax (π)5.4103 ± 0.0308  mas [3]
Distance603 ± 3  ly
(185 ± 1  pc)
Orbit [11]
Primaryε Cnc Aa
Companionε Cnc Ab
Period (P)35.14101±0.00005 d
Semi-major axis (a)1.9127±0.0004 mas
Eccentricity (e)0.4195±0.0003
Inclination (i)81.454±0.010°
Longitude of the node (Ω)356.069±0.014°
Periastron epoch (T)2448314.598 ± 0.016
Argument of periastron (ω)
(primary)		258.38±0.02°
Semi-amplitude (K1)
(primary)		56.60±0.03 km/s
Semi-amplitude (K2)
(secondary)		61.55±0.10 km/s
Details
ε Cnc Aa
Mass2.420 [11]  M☉
Radius4.8 [4]  R☉
Luminosity90 [4]  L☉
Surface gravity (log g)3.49 [12]  cgs
Temperature8,163 [4]  K
Metallicity [Fe/H]+0.10 [12]  dex
Rotational velocity (v sin i)49.2 [13] km/s
Age637 ± 19 [11]  Myr
ε Cnc Ab
Mass2.226 [11]  M☉
HD 73711
Mass2.54 [3]  M☉
Radius2.4 [3]  R☉
Luminosity43.5 [3]  L☉
Surface gravity (log g)4.09 [3]  cgs
Temperature9,572 [3]  K
Metallicity [Fe/H]+0.79 [3]  dex
Rotational velocity (v sin i)56.3 [8] km/s
Age407 [3]  Myr
Other designations
CCDM J08404+1932, WDS J08405+1933
ε Cancri: Meleph, ε Cnc, 41 Cancri, BD+20°2171, GC 11904, HD 73731, HIP 42556, HR 3429, SAO 98024, GSC 01395-02733
HD 73711: BD+20°2163, GC 11893, HD 73711, SAO 98018
Database references
SIMBAD ε Cancri
HD 73711

Epsilon Cancri (ε Cancri, abbreviated Epsilon Cnc, ε Cnc) is a white-hued binary star system in the zodiac constellation of Cancer. It is the brightest member of the Beehive Cluster [14] with an apparent visual magnitude of +6.29, [2] which is near the lower limit of visibility with the naked eye. The annual parallax shift of 5.4  mas as seen from Earth yields a distance estimate of approximately 606  light-years from the Sun.

The binary pair has the designation WDS J08405+1933. The primary star is designated Epsilon Cancri and the secondary is HD 73711. Epsilon Cancri is itself a spectroscopic binary with components designated Aa (also named Meleph [15]) and Ab. HD 73711 is also suspected of being a spectroscopic binary. [16]

Nomenclature

Praesepe. ε Cancri is the brightest blue star, near the centre of the image.

ε Cancri ( Latinised to Epsilon Cancri) is the system's Bayer designation, which originally referred to the entire cluster. [17]

In 2016, the IAU organized a Working Group on Star Names (WGSN) [18] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [19] It approved the name Meleph for the component Epsilon Cancri Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. [15]

Properties

The system is moving away from the Sun with a radial velocity of +30 km/s. [10]

Epsilon Cancri A is a double-lined spectroscopic binary system with an orbital period of 35.14 days and eccentricity of 0.42. [11] It has a stellar classification of A5 III, [5] which matches an A-type giant star. The spectrum displays the chemically peculiar characteristics of an Am star. [20] Its spectral type has been listed as kA3hA5mF0, indicating the different spectral types shown by spectral lines of calcium, hydrogen, and other metals. [6] Despite the spectral classification, evolutionary models suggest that the star is still on the main sequence, although at the very end of its hydrogen-burning life. [1] The age of the system is estimated to be around 637 million years. [11]

HD 73711 is another Am star, given a stellar classification of F0 III on the basis of its hydrogen absorption lines but a more complete classification of kA3hA5mF0. Although the spectral class would indicate that the star is a giant, models suggest that it is still fusing hydrogen in its core. [3]

References

  1. ^ a b c d e f 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.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. S2CID  119257644. Vizier catalog entry
  3. ^ a b c d e f g h i j k l m 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.
  4. ^ a b c d Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694. Bibcode: 2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467. ISSN  0004-6256.
  5. ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182.
  6. ^ a b Gray, R. O; Garrison, R. F (1989). "The late A-type stars – Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series. 70: 623. Bibcode: 1989ApJS...70..623G. doi: 10.1086/191349.
  7. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
  8. ^ a b Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode: 2005yCat.3244....0G.
  9. ^ Abt, H. A. (1986). "MK classification of the brighter Praesepe stars". Publications of the Astronomical Society of the Pacific. 98: 307. Bibcode: 1986PASP...98..307A. doi: 10.1086/131757. S2CID  122099889.
  10. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv: 1208.3048. Bibcode: 2012A&A...546A..61D. doi: 10.1051/0004-6361/201219219. S2CID  59451347. A61.
  11. ^ a b c d e f Morales, Leslie M.; Sandquist, Eric L.; Schaefer, Gail H.; Farrington, Christopher D.; Klement, Robert; Bedin, Luigi R.; Libralato, Mattia; Malavolta, Luca; Nardiello, Domenico; Orosz, Jerome A.; Monnier, John D.; Kraus, Stefan; Le Bouquin, Jean-Baptiste; Anugu, Narsireddy; Ten Brummelaar, Theo; Davies, Claire L.; Ennis, Jacob; Gardner, Tyler; Lanthermann, Cyprien (2022). "The Interferometric Binary ε Cnc in Praesepe: Precise Masses and Age". The Astronomical Journal. 164 (2): 34. arXiv: 2205.10690. Bibcode: 2022AJ....164...34M. doi: 10.3847/1538-3881/ac7329. S2CID  248986906.
  12. ^ a b Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1354....0A.
  13. ^ Paunzen, E.; et al. (February 2013). "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 429 (1): 119–125. arXiv: 1211.1535. Bibcode: 2013MNRAS.429..119P. doi: 10.1093/mnras/sts318.
  14. ^ Wang, J. J; Chen, L; Zhao, J. H; Jiang, P. F (1995). "High-precision study of proper motions and membership of 924 stars in the central region of Praesepe". Astronomy and Astrophysics Supplement. 113: 419. Bibcode: 1995A&AS..113..419W.
  15. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  16. ^ Abt, Helmut A.; Willmarth, Daryl W. (1999). "Binaries in the Praesepe and Coma Star Clusters and Their Implications for Binary Evolution". The Astrophysical Journal. 521 (2): 682. Bibcode: 1999ApJ...521..682A. doi: 10.1086/307569. S2CID  119772785.
  17. ^ "Cancer – the asses and the Manger". Star Tales (online edition). Retrieved 2022-05-03.
  18. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  19. ^ "WG Triennial Report (2015–2018) – Star Names" (PDF). p. 5. Retrieved 2018-07-14.
  20. ^ Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961–966. Bibcode: 2009A&A...498..961R. doi: 10.1051/0004-6361/200810788.
Retrieved from " https://en.wikipedia.org/?title=Epsilon_Cancri&oldid=1186888468"