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HD 154972

From Wikipedia, the free encyclopedia
Star in the constellation of Apus
HD 154972
location of HD 154972 on the map (circled)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationApus
Right ascension17h 16m 35.64850s[1]
Declination−74° 31′ 58.8407″[1]
Apparent magnitude (V)6.23±0.01[2]
Characteristics
Spectral typeA0 V[3]
U−Bcolor index+0.00[4]
B−Vcolor index−0.01[4]
Astrometry
Radial velocity (Rv)−3.1±2[5] km/s
Proper motion (μ)RA: −23.266mas/yr[1]
Dec.: −53.910mas/yr[1]
Parallax (π)9.6961±0.0359 mas[1]
Distance336 ± 1 ly
(103.1 ± 0.4 pc)
Absolute magnitude (MV)+1.11[6]
Details
Mass2.56+0.39
−0.29[7] M☉
Radius2.08±0.11[8] R☉
Luminosity42[1] L☉
Surface gravity (log g)4.24±0.06[7] cgs
Temperature9,772+228
−222[9] K
Metallicity[Fe/H]−0.11[10] dex
Age330±2[11] Myr
Other designations
56 G. Apodis[12],CD−74°1187,CPD−74°1610,FK5 3398,GC 23219,HD 154972,HIP 84510,HR 6373,SAO 257478[13]
Database references
SIMBADdata

HD 154972, also known asHR 6373 or rarely56 G. Apodis, is a solitary, bluish-white-huedstar located in the southerncircumpolar constellationApus. It has anapparent magnitude of 6.23,[2] placing it near the limit fornaked eye visibility.Gaia DR3parallax measurements place the object 336light years away,[1] and it is currently drifting closer with a heliocentricradial velocity of−3.1 km/s.[5] At its current distance, HD 154972's brightness is diminished by 0.23magnitudes due toextinction from interstellar dust.[14] It has anabsolute magnitude of +1.11.[6]

This is an ordinaryA-type main-sequence star with astellar classification of A0 V.[3] Paunzen et al. (2001) lists it as a potentialλ Boötis star.[15] It has 2.56 times themass of the Sun[7] and 2.08 times itssolar radius.[8] It radiates 42 times theluminosity of the Sun[1] from itsphotosphere at aneffective temperature of9,772 K.[9] It is estimated to be 330million years old[11] and is slightly metal deficient[10] (78% solar abundance).

References

[edit]
  1. ^abcdefgVallenari, 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 atVizieR.
  2. ^abHøg, 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. ^abHouk, N.; Cowley, A. P. (1975).University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°.Bibcode:1975mcts.book.....H.
  4. ^abJohnson, 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.
  5. ^abGontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system".Astronomy Letters.32 (11):759–771.arXiv:1606.08053.Bibcode:2006AstL...32..759G.doi:10.1134/S1063773706110065.eISSN 1562-6873.ISSN 1063-7737.S2CID 119231169.
  6. ^abAnderson, 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.
  7. ^abcStassun, Keivan G.; et al. (9 September 2019)."The RevisedTESS 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.
  8. ^abKervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004)."The angular sizes of dwarf stars and subgiants".Astronomy & Astrophysics.426 (1):297–307.arXiv:astro-ph/0404180.Bibcode:2004A&A...426..297K.doi:10.1051/0004-6361:20035930.eISSN 1432-0746.ISSN 0004-6361.
  9. ^abAllende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures".Astronomy and Astrophysics.352:555–562.arXiv:astro-ph/9911002.Bibcode:1999A&A...352..555A.ISSN 0004-6361.
  10. ^abAnders, F.; et al. (February 2022)."Photo-astrometric distances, extinctions, and astrophysical parameters forGaia EDR3 stars brighter thanG = 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. ^abGontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars".Astronomy Letters.38 (11):694–706.arXiv:1606.09028.Bibcode:2012AstL...38..694G.doi:10.1134/S1063773712110035.eISSN 1562-6873.ISSN 1063-7737.S2CID 255202762.
  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. ^SIMBAD,HD 154972 (accessed 20 September 2015)
  14. ^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.
  15. ^Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001)."A spectroscopic survey forλ 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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