Astronomy:VZ Cancri

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Short description: Variable star in the constellation Cancer
VZ Cancri
VZCncLightCurve.png
A light curve for VZ Cancri, plotted from TESS data[1]
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas/yr
Dec.: −15.856[2] mas/yr
Parallax (π)4.5062 ± 0.0268[2] mas
Distance724 ± 4 ly
(222 ± 1 pc)
Absolute magnitude (MV)1.79[5]
Details
Mass1.60[7] M☉
Radius2.90[8] R☉
Luminosity15.96[5] L☉
Surface gravity (log g)3.4±0.2[4] cgs
Temperature6,909±219[7] K
Metallicity [Fe/H]−0.41[7] dex
Rotational velocity (v sin i)26±1[4] km/s
Age1.70[7] Gyr
Other designations
VZ Cnc, BD+10°1848, HD 73857, HIP 42594, SAO 98035, PPM 154840[9]
Database references
SIMBADdata

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]

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

  1. ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 22 September 2022. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S. 
  4. ↑ 4.0 4.1 4.2 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, doi:10.1093/mnras/stx1498, Bibcode: 2017MNRAS.470.4408K. 
  5. ↑ 5.0 5.1 5.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 7.2 7.3 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, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C. 
  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, doi:10.1093/mnras/225.2.451, Bibcode: 1987MNRAS.225..451F. 
  9. ↑ "VZ Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=VZ+Cnc. 
  10. ↑ Whitney, Balfour S. (April 1950), "The Cluster-Type Cepheid HD 73857", Publications of the Astronomical Society of the Pacific 62 (364): 56, doi:10.1086/126228, Bibcode: 1950PASP...62...56W. 
  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, doi:10.1086/126229, Bibcode: 1950PASP...62...58J. 
  12. ↑ Fitch, Walter S. (May 1955), "The Cluster-Type Variable VZ Cancri", Astrophysical Journal 121: 690, doi:10.1086/146035, Bibcode: 1955ApJ...121..690F. 
  13. ↑ 13.0 13.1 13.2 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, doi:10.1086/162403, Bibcode: 1984ApJ...284..250C. 
  14. ↑ Abt, Helmut A. (November 1955), "Spectroscopic Observations of the Cluster-Type Variable VZ CANCRI.", Astrophysical Journal 122: 390, doi:10.1086/146099, Bibcode: 1955ApJ...122..390A. 
  15. ↑ Breger, M. (February 1979), "Delta Scuti and related stars", Publications of the Astronomical Society of the Pacific 91: 5–26, doi:10.1086/130433, Bibcode: 1979PASP...91....5B. 
  16. ↑ 16.0 16.1 Fu, J. -N.; Jiang, S. -Y. (April 1999), "Pulsation of the δ Scuti star VZ Cancri", Astronomy and Astrophysics Supplement 136 (2): 285–292, doi:10.1051/aas:1999214, Bibcode: 1999A&AS..136..285F. 
  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, doi:10.1007/s10509-009-0147-y, Bibcode: 2009Ap&SS.324....5B. 
  • 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, doi:10.1086/133432, Bibcode: 1994PASP..106..696A. 
  • 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, doi:10.1016/0275-1062(92)90097-U, Bibcode: 1991AcASn..32..397C. 
  • 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, doi:10.1086/148987, Bibcode: 1967ApJ...147..151D. 
  • 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, doi:10.1086/110531, Bibcode: 1967AJ.....72S.788C. 
  • Wildey, Robert L. (April 1966), "Light Curve of the Cluster Variable VZ Cancri", Publications of the Astronomical Society of the Pacific 78 (462): 132, doi:10.1086/128309, Bibcode: 1966PASP...78..132W. 
  • 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, doi:10.1086/127847, Bibcode: 1962PASP...74..420M. 
  • Spinrad, Hyron (January 1960), "A Study or VZ Cancri", Astrophysical Journal 131: 134, doi:10.1086/146816, Bibcode: 1960ApJ...131..134S. 
  • Woszczyk, A. (1958), "The Colour Index of the Variable VZ Cancri", Acta Astronomica 8: 7, Bibcode: 1958AcA.....8....7W. 




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