Astronomy:HD 98176
Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
---|---|
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[1] mas/yr Dec.: −7.836[1] mas/yr |
Parallax (π) | 9.3823 ± 0.0298[1] mas |
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 | |
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.[12] Pauzen et al. (2001) lists it as a potential λ Boötis star.[13]
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,[13] 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.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41°. Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 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. doi:10.1086/657947. ISSN 0004-6280. Bibcode: 2010PASP..122.1437P.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 7.0 7.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K.
- ↑ 8.0 8.1 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. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M.
- ↑ 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. 7734. pp. 77344E. doi:10.1117/12.857024. Bibcode: 2010SPIE.7734E..4EL.
- ↑ 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. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A.
- ↑ "HD 98176". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+98176.
- ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
- ↑ 13.0 13.1 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. doi:10.1051/0004-6361:20010630. ISSN 0004-6361. Bibcode: 2001A&A...373..625P.
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