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HD 138289

location of HD 138289 on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Apus
Right ascension	15 39 18.39712
Declination	−77° 55′ 04.8196″
Apparent magnitude (V)	6.18±0.01
Characteristics
Evolutionary stage	horizontal branch
Spectral type	K2.5 IIIb CN1.5 Ba+0.5
U−B color index	+1.36
B−V color index	+1.21
Astrometry
Radial velocity (Rv)	+13.1 km/s
Proper motion (μ)	RA: −79.376 mas/yr Dec.: −130.969 mas/yr
Parallax (π)	9.0832 ± 0.0204 mas
Distance	359.1 ± 0.8 ly (110.1 ± 0.2 pc)
Absolute magnitude (MV)	+1.21
Details
Mass	1.59 M☉
Radius	13±0.7 R☉
Luminosity	52.5 −2.4 L☉
Surface gravity (log g)	2.71 cgs
Temperature	4,672±100 K
Metallicity	−0.04 dex
Rotational velocity (v sin i)	5.2±4.3 km/s
Age	2.78 −0.52 Gyr
Other designations
32 G. Apodis[13], CPD−77°1134, FK5 3228, GC 20948, HD 138289, HIP 76664, HR 5757, SAO 257303
Database references
SIMBAD	data

HD 138289, also known as HR 5757, is a probable spectroscopic binary located in the constellation Apus, the bird-of-paradise. It has an apparent magnitude of 6.18, placing it near the limit for naked eye. Gaia DR3 parallax measurements place the object 359 light years away and it is currently receding with a heliocentric radial velocity of 13.1 km/s. At its current distance, HD 138289's brightness is diminished by 0.25 magnitudes due to extinction from interstellar dust. It has an absolute magnitude of +1.21.

The visible component has a stellar classification of K2.5 IIIb CN1.5 Ba+0.5, indicating that it is a red giant with an anomalous overabundance of cyano radicals in its spectrum. The IIIb luminosity class indicates that it is a lower luminosity giant star. The Ba+0.5 suffix states that it is a mild barium star, whose barium abundance might have come from a hidden white dwarf companion. HD 138289 is estimated to be 2.8 billion years old, enough time for it to cool and expand to 13 times the radius of the Sun. It is now on the horizontal branch, fusing helium at its core. At present it has 1.59 times the mass of the Sun and radiates 52.5 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,672 K. HD 138289 has a near solar metallicity and spins modestly with a poorly constrained projected rotational velocity of 5.2 km/s.

References

1. ^ 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.
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.
3. ^ Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1637–1641. arXiv:1109.4800. Bibcode:2012MNRAS.419.1637L. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711.
4. ^ Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. eISSN 1538-4365. ISSN 0067-0049.
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. ^ Evans, David S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E
7. ^ Anderson, 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.
8. ^ Liu, Y. J.; Zhao, G.; Shi, J. R.; Pietrzyński, G.; Gieren, W. (7 November 2007). "The abundances of nearby red clump giants". Monthly Notices of the Royal Astronomical Society. 382 (2): 553–566. Bibcode:2007MNRAS.382..553L. doi:10.1111/j.1365-2966.2007.11852.x. eISSN 1365-2966. ISSN 0035-8711.
9. ^ Kervella, 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.
10. ^ Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. eISSN 1432-0746. ISSN 0004-6361.
11. ^ 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. hdl:1721.1/124721. S2CID 166227927.
12. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.
13. 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.
14. "HD 138289". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 September 2015.
15. 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.

v t e Constellation of Apus
Apus in Chinese astronomy List of stars in Apus
Stars	Bayer α β γ δ ε ζ η θ ι κ κ Variable R (not variable) S Z MY NN NO HR 5240 5279 5306 5327 5389 5520 5547 5555 5628 5757 5786 5955 6135 6357 6373 6635 6646 6731 6751 HD 128294 129899 131664 134606 137366 137388 (Karaka) 141846 152010 Other Godzilla star
Star clusters	NGC 6101 Other IC 4499
Nebulae Hen 2-131
Galaxies Sunburst galaxy
Category

• K-type giants
• Durchmusterung objects
• Apus
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• Gould objects