HD 96146

Last updated
HD 96146
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Antlia [1]
Right ascension 11h 04m 54.1966s [2]
Declination −35° 48′ 16.817″ [2]
Apparent magnitude  (V)5.41±0.01 [3]
Characteristics
Spectral type A0 V [4]
B−V color index +0.03 [5]
Astrometry
Radial velocity (Rv)−4.66±6.09 [2] km/s
Proper motion (μ)RA: −24.217 mas/yr [2]
Dec.: +4.463 mas/yr [2]
Parallax (π)4.6163±0.4323  mas [2]
Distance 710 ± 70  ly
(220 ± 20  pc)
Absolute magnitude  (MV)−0.55 [1]
Details
Mass 3.84 [6]   M☉
Radius 6.17 [7]   R☉
Luminosity 218+47
−37 [8]   L☉
Surface gravity (log g)3.46 [9]   cgs
Temperature 9,750+113
−112 [8]   K
Metallicity [Fe/H]+0.07 [9]   dex
Rotational velocity (v sin i)10±1 [10]  km/s
Age 291+22
−21 [11]   Myr
Other designations
85 G. Antliae [12] , CD−35°6954, CPD−35°4592, FK5 2885, GC 15238, HD 96146, HIP 54173, HR 4313, SAO 202067, WDS J11049-3548AB [13]
Database references
SIMBAD data

HD 96146 (HR 4313) is a binary star [14] located in the southern constellation Antlia. The system has a combined apparent magnitude of 5.41, [3] making it visible to the naked eye under ideal conditions. Parallax measurements from the Gaia spacecraft place the pair at a distance of 710 light years with a large margin of error. It is currently receding with a poorly constrained heliocentric radial velocity of 4.7  km/s . [2]

The object's status as a double star was not known until a 1991 Hipparcos survey of double stars. Since the pair's current projected separation is around 0.04  arcseconds , it makes it difficult to distinguish both components. Nevertheless, they are located along a position angle of 226° . The secondary has been observed using speckle interferometry to be 1.8 magnitudes fainter than the visible star. [15]

The primary has a stellar classification of A0 V, indicating that it is an ordinary A-type main-sequence star. Zorec and Royer (2012) model it as a dwarf star that is 99.5% through its main sequence lifetime, close to the subgiant phase. It has 3.84 times the mass of the Sun [6] and an enlarged radius of 6.17  R☉. [7] HD 96146 shines with a luminosity 220 times that of the Sun [8] from its photosphere at an effective temperature of 9,750  K , giving a white hue. HD 96146 is currently 291 million years old [11] and unlike most hot stars, spins modestly with a projected rotational velocity of only 10  km/s . [10]

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 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.
  3. 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.
  4. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  5. ↑ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "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.
  7. 1 2 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.
  8. 1 2 3 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361.
  10. 1 2 Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 381 (1): 105–121. arXiv: astro-ph/0110490 . Bibcode:2002A&A...381..105R. doi: 10.1051/0004-6361:20011422 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 Grosbol, P. J. (June 1978). "Space velocities and ages of nearby early-type stars". Astronomy and Astrophysics Supplement Series . 32: 409–421. Bibcode:1978A&AS...32..409G. ISSN   0365-0138.
  12. ↑ 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.
  13. ↑ "HD 96146". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved September 20, 2015.
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN   1365-2966. ISSN   0035-8711.
  15. ↑ Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Costa, Edgardo; Horch, Elliott P. (2020). "Speckle Interferometry at SOAR in 2019". The Astronomical Journal. 160 (1): 7. arXiv: 2005.05305 . Bibcode:2020AJ....160....7T. doi: 10.3847/1538-3881/ab91c1 .
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