HR 4072

HR 4072
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 10h 24m 07.84606s[1]
Declination +65° 33′ 59.1239″[1]
Apparent magnitude (V) 4.93[2]
Characteristics
Spectral type A1:VpSiSrHg[3]
Variable type α2 CVn[4]
Astrometry
Parallax (π)9.61 ± 0.20[1] mas
Distance339 ± 7 ly
(104 ± 2 pc)
Details
A
Surface gravity (log g)3.80[5] cgs
Temperature10,650[5] K
Rotational velocity (v sin i)3.20[5] km/s
Other designations
ET UMa, BD+66 664, GJ 9327, HD 89822, HIP 50933, HR 4072, SAO 15163, PPM 17427, PLX 2433, TYC 4150-1302-1, IRAS 10205+6549, 2MASS J10240782+6533590
Database references
SIMBADdata

HR 4072 (ET Ursae Majoris, HD 89822, HIP 50933) is a star in the constellation Ursa Major. Its apparent magnitude is 4.94. Located around 104 parsecs (340 ly) away, it is an α2 Canum Venaticorum variable of spectral type A1.

References

  1. 1 2 3 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  3. ↑ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. 1 2 3 Ghazaryan, S.; Alecian, G. (2016). "Statistical analysis from recent abundance determinations in Hg Mn stars". Monthly Notices of the Royal Astronomical Society. 460 (2): 1912. Bibcode:2016MNRAS.460.1912G. doi:10.1093/mnras/stw911.


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