HD 98176

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HD 98176
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 11h 17m 14.32s[1]
Declination −41° 56′ 03.56″ [1]
Apparent magnitude (V) 6.44±0.01[2]
Characteristics
Spectral type A0 V [3]
B−V color index 0.015±0.004[4]
Astrometry
Proper motion (μ) RA: -55.099[1] mas/yr
Dec.: -8.112[1] mas/yr
Parallax (π)9.4757 ± 0.0433[1] mas
Distance344 ± 2 ly
(105.5 ± 0.5 pc)
Absolute magnitude (MV)1.35 [4]
Details
Mass2.500+0.414
−0.244 [5] M☉
Radius1.93±0.05 [5] R☉
Luminosity30.62+1.86
−2.15 [5] L☉
Surface gravity (log g)4.265+0.072
−0.056 [5] cgs
Temperature9774+157
−220[5] K
Metallicity [Fe/H]-0.07 [6] dex
Other designations
CD−41° 6450, GC 15525, HIP 55133, SAO 222695[7]
Database references
SIMBADdata

HD 98176 is a solitary star located in the constellation Centaurus. With an apparent magnitude of 6.44, it’s near the max visibility for the naked eye. HD 98176 is located 344 light-years (105 pc) away from the Solar System, but is unclear if the star is drifting away or close to it.

Properties[]

This is an A-type main-sequence star with 2.5 times the Sun’s mass, and 1.93 times the Sun’s radius, hence the high surface gravity. It radiates at 30 solar luminosities, and has a blueish-white hue, which corresponds to an effective temperature of 9,774 K. HD 98176 is slightly metal-deficient, with 85.11% the abundance of heavy metals compared to the Sun due to it being a Lambda Boötis star. [8]

References[]

  1. ^ a b c d 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.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000-03-01). "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. ^ Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor : Dept. Of Astronomy, University of Michigan : Distributed by University Microfilms International, 1978-. Bibcode:1978mcts.book.....H.
  4. ^ a b Anderson, E.; Francis, Ch. (2012-05-01). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
  5. ^ a b c d e Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; De Lee, Nathan; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara (2019-10-01). "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. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
  6. ^ Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  7. ^ "HD 98176". sim-id. Retrieved 2021-07-04.
  8. ^ Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (2001-07-01). "A spectroscopic survey for lambda Bootis stars. II. The observational data". Astronomy and Astrophysics. 373 (2): 625–632. Bibcode:2001A&A...373..625P. doi:10.1051/0004-6361:20010630. ISSN 0004-6361.
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