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VZ Cancri

A light curve for VZ Cancri, plotted from TESS data
Observation data Epoch J2000      Equinox J2000
Constellation	Cancer
Right ascension	08 40 52.125
Declination	+09° 49′ 27.15″
Apparent magnitude (V)	7.18 to 7.91
Characteristics
Spectral type	F2 III
B−V color index	0.288±0.020
Variable type	δ Sct
Astrometry
Radial velocity (Rv)	25.2±0.4 km/s
Proper motion (μ)	RA: −29.005 mas/yr Dec.: −15.856 mas/yr
Parallax (π)	4.5062 ± 0.0268 mas
Distance	724 ± 4 ly (222 ± 1 pc)
Absolute magnitude (MV)	1.79
Details
Mass	1.60 M☉
Radius	2.90 R☉
Luminosity	15.96 L☉
Surface gravity (log g)	3.4±0.2 cgs
Temperature	6,909±219 K
Metallicity	−0.41 dex
Rotational velocity (v sin i)	26±1 km/s
Age	1.70 Gyr
Other designations
VZ Cnc, BD+10°1848, HD 73857, HIP 42594, SAO 98035, PPM 154840
Database references
SIMBAD	data

VZ Cancri is a variable star in the constellation Cancer, abbreviated VZ Cnc. It varies in brightness with a period of 0.178364 days, from an apparent visual magnitude of 7.18 down to 7.91, which lies below the typical threshold of visibility for the naked eye. The distance to this star is approximately 724 light years based on parallax measurements, and it is receding from the Sun with a radial velocity of 25 km/s.

This star was discovered to vary in brightness by B. S. Whitney in 1950, and was classified as a cluster-type Cepheid variable, or RR Lyrae star. In 1955, W. S. Fitch found the light curve to be variable and discovered a beat period of 0.716292 d, from which is inferred a second pulsation period of 0.1428041 days. H. A. Abt found that the stellar class of this star varied from A7–A9 III during peak brightness to F1–F2 III at minimum. After H. J. Smith pointed out the distinctiveness of short period RR Lyrae variables in 1956, VZ Cnc has been grouped under the category of Delta Scuti variables.

The star is located near the center of the instability strip. Both pulsation periods for this star are in the first and second overtone; it appears to lack a fundamental mode, possibly as a result of helium depletion in the outer atmosphere. In 1994, an examination of five decades of data on this star suggested a variation in the period of maximum light with a cycle length of 49.3 years. This could be the result of previously undetected pulsation frequencies.

References

1. MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, retrieved 22 September 2022.
2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
3. ^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
4. ^ Kahraman Aliçavuş, F.; et al. (October 2017), "High-resolution spectroscopy and abundance analysis of δ Scuti stars near the γ Doradus instability strip", Monthly Notices of the Royal Astronomical Society, 470 (4): 4408–4420, arXiv:1706.04782, Bibcode:2017MNRAS.470.4408K, doi:10.1093/mnras/stx1498.
5. ^ 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.
6. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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.
7. ^ Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
8. Fernley, J. A.; et al. (March 1987), "The radii and masses of dwarf cepheids", Monthly Notices of the Royal Astronomical Society, 225 (2): 451–468, Bibcode:1987MNRAS.225..451F, doi:10.1093/mnras/225.2.451.
9. "VZ Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-09-19.
10. Whitney, Balfour S. (April 1950), "The Cluster-Type Cepheid HD 73857", Publications of the Astronomical Society of the Pacific, 62 (364): 56, Bibcode:1950PASP...62...56W, doi:10.1086/126228, S2CID 123297233.
11. Joy, A. H.; Wilson, R. E. (April 1950), "The Radial Velocity of HD 73857", Publications of the Astronomical Society of the Pacific, 62 (364): 58, Bibcode:1950PASP...62...58J, doi:10.1086/126229, S2CID 121064818.
12. Fitch, Walter S. (May 1955), "The Cluster-Type Variable VZ Cancri", Astrophysical Journal, 121: 690, Bibcode:1955ApJ...121..690F, doi:10.1086/146035.
13. ^ Cox, A. N.; et al. (September 1984), "Observations and a new interpretation for the Delta Scuti variable star VZ Cancri", Astrophysical Journal, 284: 250–256, Bibcode:1984ApJ...284..250C, doi:10.1086/162403.
14. Abt, Helmut A. (November 1955), "Spectroscopic Observations of the Cluster-Type Variable VZ CANCRI.", Astrophysical Journal, 122: 390, Bibcode:1955ApJ...122..390A, doi:10.1086/146099.
15. Breger, M. (February 1979), "Delta Scuti and related stars", Publications of the Astronomical Society of the Pacific, 91: 5–26, arXiv:astro-ph/0002349, Bibcode:1979PASP...91....5B, doi:10.1086/130433, S2CID 16994385.
16. ^ Fu, J. -N.; Jiang, S. -Y. (April 1999), "Pulsation of the δ Scuti star VZ Cancri", Astronomy and Astrophysics Supplement, 136 (2): 285–292, Bibcode:1999A&AS..136..285F, doi:10.1051/aas:1999214.
17. Arellano Ferro, A.; Núñez, N. S.; Avila, J. J.; Trejoluna, J. J. (July 1994), "Period variations and duplicity of the δ Scuti star VZ Cancri", Revista Mexicana de Astronomía y Astrofísica, 29: 218, Bibcode:1994RMxAA..29..218A.

Further reading

• Boonyarak, Chayan; et al. (November 2009), "The period variation of the double mode high amplitude δ Scuti variable VZ Cnc", Astrophysics and Space Science, 324 (1): 5–11, Bibcode:2009Ap&SS.324....5B, doi:10.1007/s10509-009-0147-y, S2CID 53639708.
• Arellano Ferro, A.; et al. (July 1994), "On the Period Variation of the Delta Scuti Star VZ Cancri", Publications of the Astronomical Society of the Pacific, 106 (701): 696, Bibcode:1994PASP..106..696A, doi:10.1086/133432, S2CID 250876310.
• Arellano Ferro, A.; et al. (June 1994), "Times of Light Maximum of VZ Cancri: 1994 Season", Information Bulletin on Variable Stars, 4039: 1, Bibcode:1994IBVS.4039....1A.
• Cao, Ming; Jiang, Shi-Yang (December 1991), "A re-analysis of the light period of VZ Cancri", Chinese Astronomy and Astrophysics, 16 (2): 148–152, Bibcode:1991AcASn..32..397C, doi:10.1016/0275-1062(92)90097-U.
• Quester, W. (June 1990), "Photoelectric Observations of VZ Cancri 1988-1990", Information Bulletin on Variable Stars, 3484: 1, Bibcode:1990IBVS.3484....1Q.
• Garbuzov, G. A.; Mitskevich, A. S. (April 1984), "On the existence of an extended atmosphere in the delta Sct-type star VZ Cnc", Pis'ma v Astronomicheskii Zhurnal, 10: 223–228, Bibcode:1984PAZh...10..223G.
• Garbusov, G. A. (October 1982), "Spectroscopic Investigation of VZ Cnc", Information Bulletin on Variable Stars, 2205: 1, Bibcode:1982IBVS.2205....1G.
• Cester, B.; et al. (September 1977), "VZ Cancri", Information Bulletin on Variable Stars, 1338: 1, Bibcode:1977IBVS.1338....1C.
• Todoran, I. (June 1976), "Photoelectric Maxima of VZ Cancri", Information Bulletin on Variable Stars, 1141: 1, Bibcode:1976IBVS.1141....1T.
• Hahn, G.; et al. (December 1975), "Photoelectric Observations of VZ Cnc (HD 73857)", Information Bulletin on Variable Stars, 1078: 1, Bibcode:1975IBVS.1078....1H.
• Danziger, I. J.; Oke, J. B. (January 1967), "Spectrophotometry of VZ Cancri", Astrophysical Journal, 147: 151, Bibcode:1967ApJ...147..151D, doi:10.1086/148987.
• Catalano, C. P.; Neff, J. S. (1967), "Variations in the Photometric Properties of RR Lyrae and VZ Cancri with Beat Phase", Astronomical Journal, 72: 788, Bibcode:1967AJ.....72S.788C, doi:10.1086/110531.
• Wildey, Robert L. (April 1966), "Light Curve of the Cluster Variable VZ Cancri", Publications of the Astronomical Society of the Pacific, 78 (462): 132, Bibcode:1966PASP...78..132W, doi:10.1086/128309, S2CID 121975700.
• Ponsen, J.; Oosterhoff, P. T. (1965), "Photoelectric observations of VZ Cnc and RZ Cep", Bulletin of the Astronomical Institutes of the Netherlands, 18: 459, Bibcode:1965BAN....18..459P.
• McNamara, D. H.; Rogers, M. C. (October 1962), "Spectroscopic Observations of VZ Cancri", Publications of the Astronomical Society of the Pacific, 74 (440): 420, Bibcode:1962PASP...74..420M, doi:10.1086/127847, S2CID 120629115.
• Spinrad, Hyron (January 1960), "A Study or VZ Cancri", Astrophysical Journal, 131: 134, Bibcode:1960ApJ...131..134S, doi:10.1086/146816.
• Woszczyk, A. (1958), "The Colour Index of the Variable VZ Cancri", Acta Astronomica, 8: 7, Bibcode:1958AcA.....8....7W.

v t e Constellation of Cancer
Cancer in Chinese astronomy List of stars in Cancer
Stars	Bayer α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε (Meleph) ζ (Tegmine) ζ η θ ι κ λ (Piautos) μ μ ν ξ (Nahn) ο ο π π ρ (Copernicus) ρ σ σ σ τ υ υ φ φ χ ψ ψ ω ω Flamsteed 1 3 5 7 8 11 12 15 20 (d) 21 24 25 (d) 27 28 (CX) 29 34 35 36 (c) 37 38 39 40 42 44 45 (A) 46 49 (b) 50 (A) 53 54 57 60 61 66 67 68 70 71 75 78 79 80 83 Variable R X RS VZ AZ DX EI HL HM HD 72945 72946 73534 (Gakyid) 79498 Other GJ 3470 (Kaewkosin) HIP 41378 K2-187 LHS 2090 Pr0211 WD J0914+1914 YBP 1194
Exoplanets 55 Cancri b c d e f β Cancri b GJ 3470 b HD 73534 b HIP 41378 b c d e f Pr0201 b
Star clusters Beehive Cluster Messier 67
Nebulae Abell 30 Abell 31
Galaxies	NGC 2503 2535 2536 2608 2623 2648 2775 2801 2803 2804 2812 Other 3C 191 3C 212 3C 215 DLA0817g IC 2431 OJ 287 QSO B0839+187 UGC 4457 4C +29.30 SDSS J0849+1114
Galaxy clusters Abell 671 Musket Ball Cluster
Category

• A-type giants
• F-type giants
• Delta Scuti variables
• Cancer (constellation)
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Objects with variable star designations