HD 28527

In this article, we will analyze the impact of HD 28527 on contemporary society. Since its inception, HD 28527 has played a crucial role in various aspects of daily life, influencing everything from people's individual decisions to the future of events at a global level. Through in-depth analysis, we will examine the multiple angles from which HD 28527 has shaped our culture, our way of relating, and our perception of the world around us. Likewise, we will explore the ways in which HD 28527 continues to generate transformations, debating the ethical and moral implications it raises in today's society. Therefore, this article aims to offer a critical and reflective look at the impact of HD 28527 in the contemporary world.

HD 28527
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 30m 33.633s[1]
Declination +16° 11′ 38.45″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Spectral type A6 IV[3] or A7 V[4]
B−V color index +0.170±0.001[2]
Variable type suspected δ Sct[5]
Astrometry
Radial velocity (Rv)+38.1±0.8[2] km/s
Proper motion (μ) RA: +104.889[1] mas/yr
Dec.: −25.446[1] mas/yr
Parallax (π)22.1875±0.1430 mas[1]
Distance147.0 ± 0.9 ly
(45.1 ± 0.3 pc)
Absolute magnitude (MV)+1.58[6]
Details
Mass1.75[7] M☉
Radius2.209[8] R☉
Luminosity19.03[2] L☉
Surface gravity (log g)4.17±0.14[7] cgs
Temperature8,274±281[7] K
Metallicity +0.30[9] dex
Rotation1.278 d[8]
Rotational velocity (v sin i)87.5[8] km/s
Age307[7] Myr
Other designations
NSV 1627, BD+15°637, GJ 170.1, GJ 9157, HD 28527, HIP 21029, HR 1427, SAO 93975[10]
Database references
SIMBADdata
Hyades cluster, with HD 28527 (marked with a green arrow) just NE of the θ Tauri pair

HD 28527 is a star in the constellation Taurus, and a member of the Hyades open cluster.[8] It is faintly visible to the naked eye with an apparent visual magnitude of 4.78.[2] The distance to this star, as determined from its parallax shift of 22 mas, is 147 light years. It is moving away from the Earth with a heliocentric radial velocity of +38 km/s.[2]

Based upon a stellar classification of A6 IV by Cowley et al. (1969),[3] this is an A-type subgiant star that has consumed the hydrogen at its core and is evolving away from the main sequence. Older studies had it classed as an A-type main-sequence star with a class of A7 V.[4] At the age of 307[7] million years, it has a high rate of spin, revolving upon its axis once every 1.278 days.[8] It is a Delta Scuti variable[5] with 1.75[7] times the mass of the Sun and 2.2[8] times the Sun's radius. The star is radiating 19[2] times the Sun's luminosity from its photosphere at an effective temperature of 8,274 K.[7]

Due to its location near the ecliptic, this star is subject to lunar occultations. These events have provided occasional, but not definitive, evidence of a close secondary companion.[11][12] Eggleton and Tokovinin (2008) catalogue this as a possible triple star system, having the inner pair being similar stars with an angular separation of 0.02″, and the outer component a magnitude 6.7 star of class F2 at a much wider separation of 250″.[13] The wide companion is HD 28458, another member of the Hyades.[10]

See also

References

  1. ^ a b c d e 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 d e f g 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.
  3. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. ^ a b Ljunggren, B.; Oja, T. (1961), "The Uppsala spectral classification", Uppsala Astronomical Observatory Annual, 4 (10): 10, Bibcode:1961UppAn...4j...1L.
  5. ^ a b Samus', N. N.; et al. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  6. ^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
  7. ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  8. ^ a b c d e f van Saders, Jennifer L.; Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", The Astrophysical Journal, 776 (2): 20, arXiv:1306.3701, Bibcode:2013ApJ...776...67V, doi:10.1088/0004-637X/776/2/67, S2CID 119097746, 67.
  9. ^ Gebran, M.; et al. (November 2010), "Chemical composition of A and F dwarfs members of the Hyades open cluster", Astronomy and Astrophysics, 523: A71, arXiv:1006.5284, Bibcode:2010A&A...523A..71G, doi:10.1051/0004-6361/200913273, S2CID 7164596.
  10. ^ a b "HD 161840", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2018-08-06.
  11. ^ Peterson, D. M.; Baron, R. L.; Dunham, E.; Mink, D.; Weekes, T. C.; Elliot, J. L. (February 1981), "Lunar occultations of the Hyades: 1979-1980", Astronomical Journal, 86: 280–289, Bibcode:1981AJ.....86..280P, doi:10.1086/112886.
  12. ^ Richichi, A.; et al. (October 1999), "New binary stars discovered by lunar occultations. IV", Astronomy and Astrophysics, 350: 491–496, Bibcode:1999A&A...350..491R.
  13. ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.