HD 98176

Last updated
HD 98176
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Centaurus
Right ascension 11h 17m 14.32361s [1]
Declination −41° 56′ 03.5646″ [1]
Apparent magnitude  (V)6.44±0.01 [2]
Characteristics
Spectral type A0 V [3]
U−B color index −0.04 [4]
B−V color index +0.03 [4]
Astrometry
Proper motion (μ)RA: −55.255  mas/yr [1]
Dec.: −7.836  mas/yr [1]
Parallax (π)9.3823 ± 0.0298  mas [1]
Distance 348 ± 1  ly
(106.6 ± 0.3  pc)
Absolute magnitude  (MV)+1.35 [5]
Details
Mass 2.5±0.3 [6]   M☉
Radius 2.04 [7]   R☉
Luminosity 28.3 [8]   L☉
Surface gravity (log g)4.1 [9]   cgs
Temperature 9,774+157
−220 [6]   K
Metallicity [Fe/H]−0.09 [10]   dex
Other designations
22 G. Centauri [11] , CD− 41°6450, CPD−41°5248, GC  15525, HD  98176, HIP  55133, SAO  222695 [12]
Database references
SIMBAD data

HD 98176, also designated as HIP 55133 and rarely 22 G. Centauri, is a solitary, white hued star located in the southern constellation Centaurus. It has an apparent magnitude of 6.44, [2] placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 348 light years distant. [1] At its current distance, its brightness is diminished by 0.32 magnitudes due to interstellar dust. [13] Pauzen et al. (2001) lists it as a potential λ Boötis star. [14]

This is an ordinary A-type main-sequence star with a stellar classification of A0 V. [3] Pauzen et al. (2001) gives it a slightly cooler class of A1 Vn, [14] which includes broad absorption lines due to rapid rotation. It has 2.5 times the mass of the Sun [6] and double its radius. [7] It radiates 28.3 times the luminosity of the Sun [8] from its photosphere at an effective temperature of 9,774  K . [6] Based on parameters derived from extinction in the Gaia passband, HD 98176 has an iron abundance 19% below solar levels.

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References

  1. 1 2 3 4 5 6 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. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  3. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41°. Bibcode:1978mcts.book.....H.
  4. 1 2 Pickles, A.; Depagne, É. (December 2010). "All-Sky Spectrally MatchedUBVRI - ZY and u′g′r′i′z′ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific. 122 (898): 1437–1464. arXiv: 1011.2020 . Bibcode:2010PASP..122.1437P. doi: 10.1086/657947 . eISSN   1538-3873. ISSN   0004-6280.
  5. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  6. 1 2 3 4 Stassun, Keivan G.; et al. (9 September 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 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  7. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  8. 1 2 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv: 1706.02208 . Bibcode:2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433 . eISSN   1365-2966. ISSN   0035-8711.
  9. ↑ Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv: 1009.0137 . Bibcode:2010SPIE.7734E..4EL. doi:10.1117/12.857024. S2CID   32097037.
  10. ↑ Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi: 10.1051/0004-6361/202142369 . eISSN   1432-0746. ISSN   0004-6361.
  11. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  12. ↑ "HD 98176". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 4 July 2021.
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711.
  14. 1 2 Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics. 373 (2): 625–632. Bibcode:2001A&A...373..625P. doi: 10.1051/0004-6361:20010630 . eISSN   1432-0746. ISSN   0004-6361.
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