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Eta Normae

Nowadays, Eta Normae is a topic that has captured the attention of many people around the world. With the advancement of technology and globalization, Eta Normae has become a relevant topic that directly impacts people's daily lives. From its impact on the global economy to its influence on society, Eta Normae has become a point of interest for academics, professionals and the general public. In this article, we will explore in detail all the facets of Eta Normae and how it has evolved over the years.

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Eta Normae
Location of η Normae (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Norma
Right ascension 16h 03m 12.89783s[1]
Declination −49° 13′ 46.9151″[1]
Apparent magnitude (V) 4.65[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type G8III[4]
U−B color index +0.64[2]
B−V color index +0.92[2]
Astrometry
Radial velocity (Rv)−0.3±2.8[5] km/s
Proper motion (μ) RA: 42.05[1] mas/yr
Dec.: 9.14[1] mas/yr
Parallax (π)14.86±0.25 mas[1]
Distance219 ± 4 ly
(67 ± 1 pc)
Absolute magnitude (MV)0.524[3]
Details
Mass2.78[3] M☉
Radius11.07+0.23
−0.09[6] R☉
Luminosity71.9±3.1[6] L☉
Surface gravity (log g)2.84[3] cgs
Temperature5052+16
−51[6] K
Metallicity −0.05[3] dex
Other designations
η Nor, CD−48°10512, HD 143546, HIP 78639, HR 5962, SAO 226466[7]
Database references
SIMBADdata

Eta Normae, Latinized from η Normae, is a single[8] star in the southern constellation of Norma. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.65.[2] The distance to this star is about 219 light years, based on parallax.[1] The Gamma Normids radiate from a position near this star.[9]

This is an aging giant star with a stellar classification of G8III,[4] having exhausted the supply of hydrogen at its core then swollen and cooled off the main sequence. At present it has a diameter of 11[6] times that of the Sun. It is a red clump[3] giant, meaning it is on the horizontal branch and is generating energy through core helium fusion. The star has 2.78[3] times the mass of the Sun and is radiating 72[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,052 K.[6] It is a source for X-ray emission.[10]

References

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. ^ a b c d e f g Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
  4. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ "eta Nor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.{{cite web}}: CS1 maint: postscript (link)
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. ^ Lunsford, Robert (2009), Meteors and How to Observe Them, Astronomers' Observing Guides, Springer Science & Business Media, pp. 76–77, Bibcode:2009mhot.book.....L, ISBN 9780387094618.
  10. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
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