HD 98176
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.
| 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 mas/yr[1] Dec.: -8.112 mas/yr[1] |
| Parallax (π) | 9.4757 ± 0.0433 mas[1] |
| Distance | 344 ± 2 ly (105.5 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.35 [4] |
| Details | |
| Mass | 2.500+0.414 −0.244 [5] M☉ |
| Radius | 1.93±0.05 [5] R☉ |
| Luminosity | 30.62+1.86 −2.15 [5] L☉ |
| Surface gravity (log g) | 4.265+0.072 −0.056 [5] cgs |
| Temperature | 9774+157 −220[5] K |
| Metallicity [Fe/H] | -0.07 [6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- "HD 98176". sim-id. Retrieved 2021-07-04.
- 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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