Astronomy:HD 121439

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Short description: Star in the constellation Apus
HD 121439
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Apus
Right ascension  14h 00m 32.81143s[1]
Declination −78° 35′ 23.9308″[1]
Apparent magnitude (V) 6.08±0.01[2]
Characteristics
Spectral type B9 III[3]
U−B color index −0.17[4]
B−V color index +0.03[4]
Astrometry
Radial velocity (Rv)4±4.7[5] km/s
Proper motion (μ) RA: −14.337[1] mas/yr
Dec.: −9.094[1] mas/yr
Parallax (π)4.2166 ± 0.0425[1] mas
Distance774 ± 8 ly
(237 ± 2 pc)
Absolute magnitude (MV)−0.80[6]
Details
Mass3.26[7] M☉
Radius5.55[8] R☉
Luminosity168[9] L☉
Surface gravity (log g)3.48[7] cgs
Temperature9,708±124[10] K
Metallicity [Fe/H]+0.22[7] dex
Other designations
CD−77°626, CPD−77°922, FK5 3111, GC 18877, HD 121439, HIP 68431, HR 5240, SAO 257107[11]
Database references
SIMBADdata

HD 121439, also known as HR 5240, is a solitary, bluish-white hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.08,[2] allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of 774 light years[1] based on Gaia DR3 parallax measurements but is receding with a fairly constrained radial velocity of 4 km/s.[5] At its current distance, HD 121439's brightness is diminished by 0.57 magnitudes due to interstellar dust.[12]

This is an evolved giant star with a stellar classification of B9 III.[3] It has 3.26 times the mass of the Sun[7] but has expanded to 5.6 times its girth.[8] It radiates 168 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 9,708 K.[10] Based on extinction from the Gaia passband, HD 121439 has an iron abundance 1.65 times that of the Sun.[7] This makes the object metal enriched.

References

  1. ↑ 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. ↑ 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. ↑ 3.0 3.1 Houk, 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. ↑ 4.0 4.1 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. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ 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. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "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. 
  9. ↑ 9.0 9.1 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  10. ↑ 10.0 10.1 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. 
  11. ↑ "HD 121439". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+121439. 
  12. ↑ 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. 
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