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,[3] 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,[2] and it is receding from the Sun with a radial velocity of 25 km/s.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 40m 52.125s[2] |
| Declination | +09° 49′ 27.15″[2] |
| Apparent magnitude (V) | 7.18 to 7.91[3] |
| Characteristics | |
| Spectral type | F2 III[4] |
| B−V color index | 0.288±0.020[5] |
| Variable type | δ Sct[3] |
| Astrometry | |
| Radial velocity (Rv) | 25.2±0.4[6] km/s |
| Proper motion (μ) | RA: −29.005 mas/yr[2] Dec.: −15.856 mas/yr[2] |
| Parallax (π) | 4.5062 ± 0.0268 mas[2] |
| Distance | 724 ± 4 ly (222 ± 1 pc) |
| Absolute magnitude (MV) | 1.79[5] |
| Details | |
| Mass | 1.60[7] M☉ |
| Radius | 2.90[8] R☉ |
| Luminosity | 15.96[5] L☉ |
| Surface gravity (log g) | 3.4±0.2[4] cgs |
| Temperature | 6,909±219[7] K |
| Metallicity [Fe/H] | −0.41[7] dex |
| Rotational velocity (v sin i) | 26±1[4] km/s |
| Age | 1.70[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This star was discovered to vary in brightness by B. S. Whitney in 1950, and was classified as a cluster-type Cepheid variable,[10] or RR Lyrae star.[11] In 1955, W. S. Fitch found the light curve to be variable and discovered a beat period of 0.716292 d,[12] from which is inferred a second pulsation period of 0.1428041 days.[13] 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.[14] 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.[15]
The star is located near the center of the instability strip.[13] Both pulsation periods for this star are in the first and second overtone;[16] it appears to lack a fundamental mode, possibly as a result of helium depletion in the outer atmosphere.[13] 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.[17] This could be the result of previously undetected pulsation frequencies.[16]
References
edit- ^ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, retrieved 22 September 2022.
- ^ a b c d e 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.
- ^ a b c 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.
- ^ a b c 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.
- ^ 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.
- ^ a b 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.
- ^ a b c d 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.
- ^ 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.
- ^ "VZ Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-09-19.
- ^ 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.
- ^ 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.
- ^ Fitch, Walter S. (May 1955), "The Cluster-Type Variable VZ Cancri", Astrophysical Journal, 121: 690, Bibcode:1955ApJ...121..690F, doi:10.1086/146035.
- ^ a b c 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.
- ^ 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.
- ^ 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.
- ^ a b 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.
- ^ 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
edit- 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.