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XX Virginis

In this article, we will explore the impact that XX Virginis has had on contemporary society. XX Virginis is a topic of great relevance and interest in today's world, which has generated extensive debate and a series of repercussions in various areas. Over the years, we have been able to observe how XX Virginis has deeply marked the way we live, think and relate to our environment. Through detailed analysis, we will examine the many facets of XX Virginis, from its origins to its influence today, with the goal of understanding its true scope and meaning.

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XX Virginis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension 14h 16m 48.593s[1]
Declination −06° 17′ 15.06″[1]
Apparent magnitude (V) 11.55 to 12.78[2]
Characteristics
Spectral type kA7hF6[3]
Variable type Anomalous Cepheid[3]
Astrometry
Radial velocity (Rv)−55.0[4] km/s
Proper motion (μ) RA: −11.421 mas/yr[1]
Dec.: −10.826 mas/yr[1]
Parallax (π)0.144±0.0194 mas[1]
Distance9,360 ± 1,100 ly
(2,869±337[5] pc)
Absolute magnitude (MV)−0.74[6]
Details
Mass0.6[6] M☉
Radius13±7[7] R☉
Luminosity156[1] L☉
Surface gravity (log g)1.95 (avg)[8] cgs
Temperature6,410 K (6,030 to 7,610)‍[8] K
Metallicity −1.57[9] dex
Age293[1] Myr
Other designations
XX Vir, TIC 6030027, GCRV 8351[10]
Database references
SIMBADdata

XX Virginis is a variable star in the equatorial constellation of Virgo, abbreviated XX Vir. It ranges in apparent visual magnitude from 11.55 to 12.78,[2] which is much too faint to be visible to the naked eye. The star is located at an estimated distance of roughly 9,400 light-years (2,900 pc).[5]

This is classified as a type II Cepheid of the BL Her type,[11] having a short pulsation period of 1.348 days.[2] However, a 2014 survey has it classified as an anomalous Cepheid of the BL Boo type.[12] The light curve is asymmetrical, resembling that of a type ab RR Lyrae variable. On the HR diagram it is positioned above the horizontal branch. For this reason, it is sometimes used as the prototype of, "Above Horizontal Branch variables of subtype 1."[13]

This is a very metal-poor star[8] with an estimated 0.6 times the mass of the Sun. The effective temperature and radius vary depending on the phase of the pulsation cycle.[6]

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 Yacob, Alemiye M.; et al. (October 2022), "A search for period changes of eight short-period Type II Cepheids", Monthly Notices of the Royal Astronomical Society, 516 (2): 2095–2111, arXiv:2207.14695, Bibcode:2022MNRAS.516.2095Y, doi:10.1093/mnras/stac2167.
  3. ^ a b "XX Vir". International Variable Star Index. AAVSO. Retrieved 2025-11-28.
  4. ^ Duflot, M.; et al. (1995), "Radial velocities: The Wilson-Evans-Batten catalogue", Astronomy and Astrophysics Supplement Series, 114: 269, Bibcode:1995A&AS..114..269D.
  5. ^ a b Stassun, Keivan G.; et al. (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.
  6. ^ a b c Wallerstein, G.; Brugel, E. W. (December 1979), "The absolute magnitude of the field population. II. Cepheid XX Virginis", Astronomical Journal, 84: 1840–1845, Bibcode:1979AJ.....84.1840W, doi:10.1086/112615.
  7. ^ Balog, Z.; et al. (May 1997), "Baade-Wesselink Radius Determination of Type II Cepheids", Astronomical Journal, 113: 1833, Bibcode:1997AJ....113.1833B, doi:10.1086/118394.
  8. ^ a b c McNamara, D. H.; Pyne, M. D. (May 1994), "A Photometric Study of XX Virginis and V716 Ophiuchi", Publications of the Astronomical Society of the Pacific, 106: 472, Bibcode:1994PASP..106..472M, doi:10.1086/133402.
  9. ^ Wallerstein, George; Farrell, Elizabeth M. (December 2018), "Kinematics of Type II Cepheids of the Galactic Halo", The Astronomical Journal, 156 (6), id. 299, arXiv:1811.02003, Bibcode:2018AJ....156..299W, doi:10.3847/1538-3881/aaee6d.
  10. ^ "U Peg", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2024-01-28.
  11. ^ Smith, Horace A.; et al. (August 1978), "Strömgren photometry of field BL Herculis stars. I. BL Herculis and XX Virginis", Publications of the Astronomical Society of the Pacific, 90: 422–428, Bibcode:1978PASP...90..422S, doi:10.1086/130351.
  12. ^ Drake, A. J.; et al. (2014), "The Catalina Surveys Periodic Variable Star Catalog", The Astrophysical Journal Supplement Series, 213 (1): 9, arXiv:1405.4290, Bibcode:2014ApJS..213....9D, doi:10.1088/0067-0049/213/1/9, S2CID 119180446.
  13. ^ Jayasinghe, T.; et al. (July 2018), "The ASAS-SN catalogue of variable stars I: The Serendipitous Survey", Monthly Notices of the Royal Astronomical Society, 477 (3): 3145–3163, arXiv:1803.01001, Bibcode:2018MNRAS.477.3145J, doi:10.1093/mnras/sty838.
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