HD 154556

Last updated
HD 154556
Apus constellation map.svg
Red circle.svg
location of HD 154556 in red
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 17h 12m 19.93421s [1]
Declination −70° 43′ 15.8963″ [1]
Apparent magnitude  (V)6.21±0.01 [2]
Characteristics
Evolutionary stage subgiant
Spectral type K1 IV CN3 [3]
U−B color index +1.04 [4]
B−V color index +1.06 [4]
Astrometry
Radial velocity (Rv)−24±0.4 [5]  km/s
Proper motion (μ)RA: +49.060  mas/yr [1]
Dec.: −78.104  mas/yr [1]
Parallax (π)14.3386 ± 0.0224  mas [1]
Distance 227.5 ± 0.4  ly
(69.7 ± 0.1  pc)
Absolute magnitude  (MV)+2.10 [6]
Details
Mass 1.25 [7]   M☉
Radius 6.35±0.32 [8]   R☉
Luminosity 19.7±0.1 [1]   L☉
Surface gravity (log g)2.90±0.25 [9]   cgs
Temperature 4,677 [10]   K
Metallicity [Fe/H]+0.04±0.09 [9]   dex
Rotational velocity (v sin i)<1 [11]  km/s
Age 3.52+0.36
−0.37 [1]   Gyr
Other designations
55 G. Apodis [12] , CD−70°1498, CPD−70°2361, GC  23140, HD  154556, HIP  84158, HR  6357, SAO  257472 [13]
Database references
SIMBAD data

HD 154556, also known as HR 6357, is a solitary orange-hued star located in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.21, [2] placing it near the limit for naked eye visibility. The star is located relatively close at a distance of 228 light years based on Gaia DR3 parallax measurements, [1] but it is drifter closer with a heliocentric radial velocity of −24  km/s . [5] At its current distance, HD 154556's brightness is diminished by 0.26 magnitudes due to interstellar dust. [14] It has an absolute magnitude of +2.10. [6]

HD 154556 has a stellar classification of K1 IV CN3, [3] indicating that it is an evolved K-type subgiant with a moderate abundance of cyano radicals in its spectrum, making it a CN star. It has 1.25 times the mass of the Sun [7] and is calculated to be 3.52 billion years old, [1] having expanded to 6.35 times the radius of the Sun. [8] It now radiates 19.7 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,677  K . [10] It has a near solar metallicity [9] and spins slowly with a projected rotational velocity lower than 1  km/s . [11]

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<span class="mw-page-title-main">HD 118285</span> SPB star in the constellation Chamaeleon.

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

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<span class="mw-page-title-main">HD 175219</span> K-type giant; Corona Australis

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<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.

<span class="mw-page-title-main">HD 101917</span> High proper motion star

HD 101917, also designated as HR 4509, or rarely 34 G. Chamaeleontis, is a solitary star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.38, placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 185 light years based on Gaia DR3 parallax measurements but is receding with a heliocentric radial velocity of 33 km/s. At its current distance, HD 101917's brightness is diminished by 0.28 magnitudes due to interstellar dust. It has an absolute magnitude of +2.69.

<span class="mw-page-title-main">HD 174500</span> Star in the constellation of Telescopium

HD 174500, also designated as HR 7097 or rarely 34 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.16, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object 692 light years away, and it is currently receding with a heliocentric radial velocity of 35 km/s. At its current distance, HD 174500's brightness is diminished by 0.39 magnitudes due to interstellar dust. It has an absolute magnitude of −0.82.

<span class="mw-page-title-main">HD 189080</span> Star in the constellation of Telescopium

HD 189080, also known as HR 7621 or rarely 74 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.18, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place it at a distance of 357 light years and it is currently receding rapidly with a heliocentric radial velocity of 66.9 km/s. At its current distance, HD 189080's brightness is diminished by 0.17 magnitudes due to extinction from interstellar dust. It has an absolute magnitude of +1.1.

<span class="mw-page-title-main">HD 170873</span> K-type giant; Telescopium

HD 170873, also known as HR 6954 or rarely 19 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.20, placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 551 light years and it is currently receding with a heliocentric radial velocity of 23.8 km/s. At its current distance, HD 170873's brightness is diminished by 0.39 magnitudes due to interstellar dust, and it has an absolute magnitude of −0.31.

<span class="mw-page-title-main">HD 185075</span> Star in the constellation Telescopium

HD 185075, also known as HR 7459 or rarely 65 G. Telescopii, is a solitary star located in the southern constellation Telescopium. It has an apparent magnitude of 6.26, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 422 light years and it is currently receding with a heliocentric radial velocity of 14.8 km/s. At its current distance, HD 185075's brightness is diminished by 0.23 magnitudes due to interstellar dust and it has an absolute magnitude of +0.92.

<span class="mw-page-title-main">HD 186756</span> K-type giant; Telescopium

HD 186756, also known as HR 7521 or rarely 68 G. Telescopii, is a solitary orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.25, placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 743 light years; it is currently approaching with a heliocentric radial velocity of −21.2 km/s. At its current distance, HD 186756's brightness is diminished by 0.34 magnitudes due to extinction from interstellar dust and it has an absolute magnitude of −0.96.

References

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  2. 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.
  3. 1 2 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. 1 2 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. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  6. 1 2 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.
  7. 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.
  8. 1 2 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.
  9. 1 2 3 Randich, S.; Gratton, R.; Pallavicini, R.; Pasquini, L.; Carretta, E. (August 1999). "Lithium in population I subgiants". Astronomy and Astrophysics. 348: 487–500. Bibcode:1999A&A...348..487R. ISSN   0004-6361.
  10. 1 2 Allende 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.
  11. 1 2 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.
  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 154556". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 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.
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